What is thick-walled steel pipe

What is thick-walled steel pipe?

Thick wall steel pipe, the steel pipe The diameter and wall thickness of the steel tube ratio is smaller than 20 is called the thick wall steel pipe. Mainly used for drilling, pipe for petrochemical industry Cracking tube , Boiler tube And bearings and car, tractor, aircraft with high precision tube structure.

Brief introduction Standard parameters
Welding technology Technological process
Maintenance How to identification thick-walled steel pipe

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Brief introduction

The general use of thick wall steel pipe hot rolling technology, if it is a unit of measure to distinguish words, then, generally, the wall thickness / diameter equal to 0.05 is a watershed of thick wall steel pipe and thin-walled steel pipe, wall thickness / diameter of less than 0.05 is greater than the thickness of thin-walled steel tube, steel pipe, in use for for thin-walled steel pipe. The blank and thick wall steel pipe used in hollow parts. The use of pressure and pipeline.
purpose
Thick wall steel pipe is mainly used in tap water engineering, petrochemical industry, chemical industry, electric power industry, agriculture and city construction. Used for liquid delivery: water supply and drainage. Gas transportation: gas, vapor, liquefied petroleum gas. For structural purposes: as piling pipe, tube for bridge; pier, road and building structure.
Texture of material

Commonly used materials for domestic 10# 20Mn 42CrMo 36CrMo 40Cr 20Cr: 15CrMo 12Cr1Mov Q235A, Q235B1Cr17, 00Cr19Ni11, 0Cr13, 1Cr18Ni9, 0Cr18Ni11Nb, 16Mn, 45#, 20#, L245, L290, Q345, X42, X46, X70, and X80.

Standard parameters
Tensile strength

The tensile strength of thick wall steel pipe

Serial number
Name
The amount of symbols
Unit symbol
Meaning
One
Strength
The strength of metals under external force, the ability to resist plastic deformation and fracture
One
tensile strength
Sigma B
MPa
Metal tensile, bear in breaking the original cross-sectional area of the specimen and the maximum load is called the tensile strength
Pb
Sigma b=
Fo
In Pb, the samples were broken before the maximum load (N)
Fo samples the original cross-sectional area (mm)

Size deviation

According to the national standard GB/T17395 “ seamless steel pipe The size, shape, weight and tolerances “of size deviation requirements, can be divided into standardized and non standardized two, four grades.

Wall thickness deviation

Standard wall thickness allowance

Deviation level
Wall thickness tolerance
S/D
0.1< S/D
0.05< S/D = 0.1
0.025< S/D = 0.05
S/D = 0.025
S1
Minimum 15% +, + 0.6mm
S2
A
Minimum 12.5% +, + 0.4mm
B
+ positive deviation depends on the weight requirements
– 12.5%
S3
A
Minimum 10% +, + 0.2mm
B
+ 10%
Minimum 12.5% +, + 0.4mm
+ 15%
C
+ positive deviation depends on the weight requirements – 10%
S4
A
Minimum 7.5% +, + 0.15mm
B
+ 7.5%
+ 10%
+ 12.5%
+ 15%
S5
Minimum 5% +, + 0.10mm

Non standard wall thickness allowance

Deviation level
The wall thickness of the allowable deviation%
NS1
+15
-12.5
NS2
+15
-10
NS3
+12.5
-10
NS4
+12.5
-7.5
Note: S is the nominal wall thickness of steel pipe, D steel pipe is the nominal diameter.

Outside diameter tolerance

The allowable deviation of the standard diameter
Deviation level
The allowable deviation of diameter
D1
Minimum 1.5% +, + 0.75mm
D2
Minimum 1% +, + 0.50mm
D3
Minimum 0.75% +, + 0.30mm
D4
Minimum 0.50% +, + 0.10mm
The allowable deviation of non standard diameter
Deviation level
The allowable deviation of diameter,%
ND1
+1.25 -1.50
ND2
+ 1.25
ND3
+1.25 -1.0
ND4
+ 0.8

Strength grade

  • 1) to Nominal pressure Said the grade or provisions of the pressure temperature ratings Pipe fitting According to the prescribed standards, a pressure temperature rating as the benchmark, such as GB/T 17185;
  • 2) standard provides only a nominal fitting thickness connected with the pipe, according to the standard provisions of the applicable benchmark grade pipe pressure temperature ratings, such as GB14383~GB14626.
  • 3) only provides fittings size standards, such as GB12459, GB 13401, the bearing strength should be determined by confirmatory test.
  • 4) other, should be pressure design or analytical method according to the relevant provisions to determine the use of reference. In addition, determine the pipe strength, also should not be lower than that of the whole pipeline system the most severe conditions may arise in the operation under pressure.

Welding technology

Welding method
Thick wall steel pipe welding first clean the welding joints of oil, paint, water, rust, and then according to the thickness of the groove, thick in some, thin is smaller (grinding), and then the product gap, is generally a rod or wire diameter 1- 1.5 times, if groove accidentally opened a can be appropriate to stay small. Tack welding of at least 3, 4 general good work. The welding time should be the best starting point more than half of welding, the lowest point of a centimeter, as from the opposite connection. If the wall thickness of steel pipe, should be stratified, at least two layers, the first layer of whole ring welding can weld second layer.
Technological process
Billet, heating, perforation, three roll cross rolling, rolling or extrusion, tube to tube diameter (or reducing), cooling, straightening, pressure test (or testing), mark.

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How To Heat Treat Seamless Small-diameter Thick-walled Steel Pipe

Small-diameter thick-walled seamless pipes are steel pipes with a small ratio of outer diameter to wall thickness. How should such steel pipes be heat treated?

  1. The repaired parts need to be normalized during the heat treatment process. The normalizing is a heat treatment process of heating the small-diameter thick-walled tubes of seamless steel tubes to 45 ° C above Ac3, and after cooling for a suitable time, in a static air. Structural parts requiring mechanical properties require quenching after normalizing to meet mechanical performance requirements. Medium and high alloy steels and large forgings require high temperature tempering after normalizing to eliminate the internal stress generated during normalizing.
  2. Annealing treatment of small-diameter thick-walled tubes of seamless steel tubes is a heat treatment process in which metals and alloys are heated to a suitable temperature for a certain period of time and then slowly cooled. After annealing, the sub-eutectoid steel is ferrite plus flaky pearlite; the eutectoid steel or hypereutectoid steel is granular pearlite. In summary, the annealed tissue is a tissue that is close to equilibrium.
  3. Over-eutectoid steel normalizing heating knife Acm or more, so that the original mesh-like cementite is dissolved into austenite, and then cooled at a faster rate to inhibit the precipitation of cementite in the austenite grain boundary , which can eliminate the network carbide and improve the structure of the hypereutectoid steel. Welded parts require normalizing of the weld strength to improve the weld structure and ensure weld strength.
  4. Some seamless steel pipe small-diameter thick-walled pipes produce partial martensite transformation during forging to form hard tissue. In order to eliminate this kind of bad organization, when it is normalized, it is heated and kept at a temperature of about 20 °C higher than the normal normalizing temperature for normalizing. The normalizing process is relatively simple, which is beneficial to the use of forging waste heat normalizing, which can save energy and shorten the production cycle. Normalized processes and improper handling also produce tissue defects, similar to annealing, and the remedies are basically the same.

What Are The Heat Treatment Processes For Thick-walled Seamless Pipes?

The surface heat treatment technology of the 45th thick-walled seamless steel pipe is constantly being innovated, and the current technology has been developed more and more sophisticated. Let’s take a look at several methods of 45-thick thick-walled seamless pipe processing.
1. Surface hardening:
Rapid heating of No. 45 thick-walled seamless pipe by different heat sources, when the surface temperature of the part reaches above the critical point (when the temperature of the 45# seamless pipe core is below the critical point), it is quickly cooled, so that 45# seamless The surface of the tube is hardened and the heart remains in its original tissue. The most widely used in the industry is induction heating and flame heating surface quenching.
2. Chemical heat treatment:
The 45# seamless tube is placed in a medium containing active elements to heat and keep warm, so that the active atoms in the medium penetrate into the surface layer of the 45-thick thick-walled seamless tube or form a coating of a compound to change the texture and chemical composition of the surface layer. Therefore, the surface of the part has special mechanical or physicochemical properties.
3. Contact resistance heating quenching:
Similar to the electric resistance welded pipe, a voltage of less than 5 volts is applied to the 45# seamless pipe through the electrode, a large current flows at the contact of the electrode with the 45# seamless pipe, and a large amount of resistance heat is generated, so that 45# is absent. The surface of the seam tube is heated to the quenching temperature, and then the electrode is removed, and the heat is transferred into the interior of the 45# seamless tube and the surface is rapidly cooled, that is, the quenching purpose is achieved.
4. Electrolytic heating quenching:
The 45th thick-walled seamless tube is placed in an electrolyte of an acid, alkali or salt aqueous solution, and the 45# seamless tube is connected to the cathode, and the electrolytic tank is connected to the anode. After the direct current is turned on, the electrolyte is electrolyzed, oxygen is released on the anode, and hydrogen is discharged on the seamless tube No. 45. Hydrogen forms a gas film around the 45# seamless tube, which becomes a resistor to generate heat. The surface of the 45th thick-walled seamless tube is rapidly heated to the quenching temperature, and then the electricity is cut off, the film immediately disappears, and the electrolyte becomes a quenching medium. , so that the surface of the 45# seamless pipe is rapidly cooled and hardened.
5. Laser heat treatment:
The application of laser in heat treatment began in the early 1970s, and then entered the production application stage from the laboratory research stage. When a focused high energy density (10 W/cm) laser illuminates the metal surface, the metal surface rises to the quenching temperature in a few hundredths of a second or even a few thousandths of a second.
The above several heat treatment technologies are now more advanced technologies, and the performance requirements of the 45th thick-walled seamless pipe have been improved very well. Now the market development of the 45th thick-walled seamless pipe is getting better and better, I believe that follow-up The market for the 45th thick-walled seamless pipe will be even broader.

Weld reinforcement
Steel pipe wall thickness is less than 12.5mm, the weld height is not greater than 3.0mm; tube wall thickness is greater than 12.5mm, the weld height is less than 3.5mm.
Bending
Nominal diameter of not more than 168.3mm Steel pipe That should be straight or bending index according to the provisions of the agreement both sides of supply and demand;
Steel pipe nominal diameter greater than 168.3mm, the bending degree greater than 0.2% of the length of steel pipe.
The end of the steel tube wall thickness is greater than 4mm, the pipe end chamfering can be 30 +5 degrees to 0 degrees, left 1.6mm + 0.8mm, the pipe end slope is less than or equal to 5mm.

Engineering requirements

The thick walled tube real selection and corresponding provisions and regulations and the use of thick walled tube In the actual use or use, must follow the provisions of relevant laws and regulations and norms, especially the extremely high hazard or conveying fluid medium, medium and high pressure gas pipelines and other flammable occasions. In this context, based primarily on the use and use conditions (pressure, temperature, fluid) to determine the type of pipe fittings. The following lists the relevant regulations / standard, for reference only.
1) method of safety supervision of special equipment;
2) Regulations on safety inspection of special equipment;
3) the provisions of safety management and supervision over pressure pipelines;
4) the provisions of quality supervision and safety supervision of special equipment;
5) special equipment design / manufacturing / installation supervision and management regulations (draft);
6) Pressure Pipe Safety Technology Supervision Regulation (draft);
7) technical specification for industrial metal pipeline safety (draft);

Safety and economy

Structure type fittings used in the actual projects, in addition to the introduction, and other various kinds of fittings, to meet a variety of different conditions, especially in special conditions. In the engineering design and selection, the strength grade of pipe is high, the safety is high, but the engineering cost is larger, it will cause unnecessary waste.
Considering the economic benefits, to meet the requirements of engineering design at the same time, reduce costs as much as possible, but tend to form a small number of varieties selected on the overall fitting results, which is disadvantageous to the construction site material management, regulation and design changes require materials with generation etc.. Therefore, the selection of pipe fittings, comprehensive safety and economy, as far as possible to reduce the fitting varieties suitable. In addition, the site construction conditions, construction level, procurement cycle factors such as pipe, also should be taken seriously in the selection of pipe fittings. The specific circumstances, should also consider the possibility of strengthening pipe joints, small caliber pipe and mitered elbow bending of the site.
At the same time, for fitting the production capacity and product market supply, it is necessary to understand the situation.

The existing problems

  • 1) Domestic standards are not perfect, not standard fittings and fittings should be type parameters of standard material standards including fittings. But in the material standards or regulations is not complete, or lack of goods such as Ting requirements and inspection rules, and the group that the quality requirements of quality and technical aspects. The pipe material standard of supporting the poor, often from their respective positions, rather than from the perspective of the whole pressure pipe standard system to develop. Used in engineering, Pipe There is no standard, but the corresponding forging or casting standard. The reality is the use of pressure vessel standard fittings forgings forging standard, no differences between the two considerations, such as welding, film inspection and other provisions.
  • 2) Pipe fitting The standard contents vary widely, consistent with a lack of systematic and cohesive contradictions, causing inconvenience to use.
  • 3) Standard test without fittings, only GB12459, GB13401 standard specifies the calculation of blasting test of seamless steel butt welding fittings and steel pipe fittings of the pressure of the other pipe fittings manufacturing quality assurance test standard or Standard No.

Computing method

The calculation formula of theoretical weight per meter
Delivery time for the spiral steel pipe according to the actual weight of shipment or delivery according to theoretical weight
The actual weight, time of delivery, the weight of the product is according to the weighing weight (weighing) delivery;
Theoretical weight — at the time of delivery, the product weight is calculated by nominal size of the steel weight. The formula is as follows (required delivery according to theoretical weight, should be specified in the contract):
Theoretical weight per meter of spiral steel pipe (steel density 7.85kg/dm3) formula: W=0.02466 (D-S) S
Type: W– spiral pipe per meter of theoretical weight, kg/m;
Nominal diameter D– pipe, mm;
S– spiral pipe nominal wall thickness
Seamless steel tube The weight of the formula: [( external diameter Thickness) * wall thickness of]*0.02466=kg/ meters (weight per meter)

Maintenance

The key to the quality of the steel pipe wall thickness uniformity number of wall thickness, thick wall steel pipe wall thickness is out of control will directly affect the quality and use of steel pipe, thick wall steel pipe, large diameter thick wall steel pipe is generally used in all kinds of mechanical processing, thick wall parts processing, pipe wall thickness pipe of the uniform directly effect of quality of the machined parts, pipe wall thick wall steel tube is out of control, the overall quality of the steel pipe is not strictly. The site or warehouse to select appropriate sites and storage of thick wall steel pipe, should be selected in the clean, unobstructed drainage areas, away from the harmful gas or dust factories. To remove weeds and all debris on the ground to keep clean, thick wall steel pipe. Not in the warehouse with acid and alkali, salt, cement and other corrosive materials piled up together on thick wall steel pipe. Different varieties of thick wall steel pipe shall be stacked separately to avoid confusion, to prevent contact corrosion. Large steel, steel, steel, or large diameter thick wall steel pipe, forgings can be piled up in the open air.

Small and medium sized steel, wire rod, steel, medium caliber thick wall steel pipe, steel wire and wire rope, can be stored in a well ventilated material shed, but must cover pad. Some small thick wall steel pipe, steel sheet, steel, silicon steel sheet, thin or small caliber thick wall steel pipe, cold rolling, cold drawn thick wall steel tube as well as high prices, easy corrosion metal products, can be stored in storage. The warehouse should be selected according to geographical conditions, generally the ordinary closed warehouse, the roof walls, doors and windows tightly, with ventilated warehouse. The Treasury requires sunny pay attention to ventilation, pay attention to keep off rain moisture, suitable storage environment. Reasonable stacking and first put stacking principle is solid in the stacking, to ensure the safety of the conditions, do stacking according to varieties, specifications, different varieties of materials to prevent confusion and mutual stacking, corrosion, the principle of prohibition in the stack near the corrosive goods store, the thick wall steel pipe. The steel piled up in the open air the following must be chock or stone, stack face slightly tilted to facilitate drainage, and pay attention to material placed straight, to prevent deformation caused by bending. The height of stack, the manual operation is not more than 1.2m, the mechanical operation of the stack is not more than 1.5m, the width is not more than 2.5m. between the stack and the stack should have a certain channel check road access is generally O.5m, depending on the material size and transport machinery and is generally 1.5 ~ 2.Om. duo pad high, if the warehouse for Chaoyang cement floor pad high O.1m can; if the mud, to pad high O.2 ~ 0.5m. If the open-air site, cement ground pad high O – 3 – O – 5m, 0.5 ~ O.7m. high mud sand cushion piled up angle steel and channel steel should be put down, the mouth down, steel should be put, I groove surface can not towards the thick wall steel pipe, to avoid water rust.

Related Advantages Of Thick-walled Seamless Pipe Cold Extrusion Technology

  1. The thick-walled seamless pipe cold extrusion technology has the following advantages:
  2. Extrusion parts size accurate surface smoothness: At present, the cold extrusion parts developed in China generally have a dimensional accuracy of 8 to 9 grades. If the ideal lubrication is used, the precision is second only to the fine polished surface. Therefore, parts manufactured by the cold extrusion method generally do not need to be reworked, and a small amount only needs to be finished (grinding).
  3. Saving raw materials: The material utilization rate of cold extrusion parts can usually reach more than 80%. For example, the utilization rate of the piston machining material of the Jiefang brand automobile piston is 43.3%, and the material utilization rate is increased to 92% when the cold extrusion is used; and if the universal joint bearing sleeve is changed to cold extrusion, the material utilization rate is from the past. 27.8% increased to 64%. It can be seen that the production of mechanical parts by cold extrusion can save a lot of steel and non-ferrous materials.
  4. High productivity: The efficiency of producing mechanical parts by cold extrusion method is very high, especially in the production of large-volume parts, which can be several times, several times, or even several hundred times more efficiently produced by cold extrusion. For example, the cold extrusion method for automotive piston pins is 3.2 times higher than that for cutting, and the cold extrusion piston pin robot is currently used to further increase productivity. The productivity of a cold extrusion automaton is equivalent to the productivity of 100 ordinary lathes or 10 four-axis automatic lathes.

Processing performance of thick-walled Seamless Steel Pipe

  1. Thick-walled seamless steel pipe castability (castability): refers to the ability of metal materials to obtain qualified castings by casting. Casting properties mainly include fluidity, shortening and segregation. Fluidity refers to liquid metal filling molds. Capability, shortening refers to the degree of volume shortening when the casting is condensed. Segregation refers to the non-uniformity of the chemical composition and arrangement of the metal during the cooling and condensation process due to the difference in crystallization.
  2. Thick wall seamless steel tube forgeability: refers to the metal material can change the shape without cracking during pressure processing. It can be hammered, rolled, stretched, twisted in hot or cold state. Pinch and other processing. The quality of forgeability is primarily related to the chemical composition of metal materials.
  3. Thick-walled seamless steel pipe machinability (cuttability, machinability): refers to the ease with which a metal material becomes a qualified workpiece after being machined by a tool. The machinability is good and the surface roughness of the workpiece is usually processed. It is measured by the cutting speed and the degree of wear of the tool.  It is related to many factors such as the chemical composition, mechanical function, thermal conductivity and degree of work hardening of the metal material. It is usually roughly judged by the hardness and the resistance for the machinability. Generally speaking, the higher the hardness of the metal material, the harder it is to cut. The hardness is not high, but the resistance is large and the cutting is difficult.
  4. Weldability (weldability): refers to the customary function of metal materials for welding processing. Firstly, it refers to the difficulty of obtaining high-quality welded joints under certain welding process conditions. It contains two aspects: Combined function, that is, under certain welding process conditions, the certain metal constitutes the sensitivity of welding defects, and the second is the application of the function, that is, the certain metal welding joints have the applicability to the application requirements under certain welding process conditions.

Bearing Capacity Of Thick-walled Seamless Steel Tubes

The outstanding feature of thick-walled seamless steel pipe is its strong pressure resistance, and it can be transported by various liquids and gases. So how is the carrying capacity of thick-walled seamless steel pipes improved? The following is a detailed introduction for everyone.
In layman’s terms, thick-walled seamless steel tubes can carry weight indirectly. It is generally believed that cabinets are also best not to hang on light-weight walls, but for light-weight walls that have been tiled, because cement can enhance the load-bearing capacity of the wall, the cabinet can be hung on the wall even without special treatment. . However, for the sake of insurance, it is best to deal with the wall. The method of treatment is to first coat a thick-walled seamless steel pipe on the wall, then smooth it with cement mortar, and finally seal it with gypsum board.
However, the safest method is to use a special hanger to secure the thick-walled seamless steel cabinet to the floor. Thick-walled seamless steel tubes carry relatively high pressure and are widely used in the construction bottom and transport liquids. From the perspective of his performance, the demand for thick-walled seamless steel tubes and the market will become stronger and stronger. Here are some reasons why thick-walled seamless steel pipes often burst:
The hot-rolled rolling position of thick-walled seamless steel tube steel is 38, 118m away from the strip head, mainly located in the middle of the strip.

  1. It is speculated from the shape of the large hole of the rolling crack that the crack starts in the middle of the width of the strip. The reason is that the rolling force and the shearing force cause the crack to stretch and form a macroscopic macroscopic hole.
  2. The seamless steel pipe in the cold rolling production process interrupted the fracture surface smooth, no obvious surface defects before and after the fracture.
  3. Observing the microscopic morphology of the fracture, the typical dimple-like ductile fracture morphology is observed. At the same time, the fracture is layered, the central dimple is larger, the dimple is reduced at the near surface, and the crack exhibits divergence mainly center fracture. The extended fracture morphology has a deep fracture depth at the center, and it is speculated that the layered morphology of the fault zone is closely related to the central segregation.

Application Of Thick-walled Seamless Steel Pipe

The term seamless steel pipe is believed to be familiar to many people. It is not well understood that it is only a detailed classification. Because the types and types of steel pipes are numerous and numerous, the number of pipes including plastics has reached tens of thousands in the world. These pipes are used in various ways, and every pipe from the sewer to the city plays a role. The most important role, the process development, makes thick-walled steel pipes, which are smaller than 20 diameter, into hot-selling pipes.
Many people may be unfamiliar, but they use this material in many channels. For example, buildings such as some other industries use seamless steel pipes because the walls of thick-walled seamless steel pipes are thick and durable. Widely used. Thick-walled steel pipes can also be used as sewage pipes. It can also be used as oil pipes. Nowadays, the underground passages of the city are indispensable for thick-walled steel pipes. Steel pipes are also used to build mobile scaffolding. Because the quality of thick-walled steel pipes is very good, more and more industries are starting. Pay attention to this material.
In the construction of cars or corridors, thick-walled steel pipes are often used for their small advantages. Many of our automobile exhaust pipes are made of thick-walled steel pipes, although many plastic pipes are used in construction. The disadvantage of the plastic pipe is obvious, the age and oxidation resistance are absolutely inferior to the steel pipe. That is to say, human development has been inseparable from the new building materials of steel pipes. Stainless steel has been popular for many years. Manufacturers have made series of stainless steel products such as thick-walled steel pipes according to the principle of stainless steel durability, which is considered to be a major part of the human tube industry. progress.
The development prospects of thick-walled steel pipes are good, because the construction of big cities is inseparable from it. In the future, there will be more industrial land to use as a necessary material for engineering, and its role is slowly changing. Serving human beings is the mission of thick-walled steel pipes. Our lives have also become more abundant with the addition of thick-walled steel pipes, and the convenience and convenience it provides are very real. It can be seen that thick-walled steel pipes have slowly entered various industries and entered our lives.

Resource table
The specific parameters and specifications of thick wall steel pipe

Texture of material
Specifications
Number
Texture of material
Specifications
Number
Texture of material
Specifications
Number
material
quality
Specifications
Number
Texture of material
Specifications
Number
20#
38*8-12
Twelve
20#
146*40
Twenty
20#
194*45
Twenty
45#
140*28
Ten
45#
194*32
Twenty-five
20#
42*8-14
Fourteen
20#
152*25
Twenty
20#
194*50
Twenty
45#
140*30
Twenty
45#
194*35
Thirty
20#
45*8-14
Fourteen
20#
152*28
Twenty
20#
203*20
Twenty
45#
140*32
Fifteen
45#
194*40
Thirty
20#
50*8-14
Fourteen
20#
152*30
Twenty-five
20#
203*25
Thirty
45#
140*35
Twenty
45#
194*45
Twenty
20#
54*8-14
Fourteen
20#
152*32
Fifteen
20#
203*28
Twenty
45#
140*38
Ten
45#
194*50
Twenty
20#
57*8-14
Fourteen
20#
152*35
Twenty
20#
203*30
Twenty
45#
140*40
Ten
45#
203*20
Twenty-five
20#
60*8-14
Eighteen
20#
152*38
Twenty
20#
203*32
Twenty
45#
140*45
Ten
45#
203*22
Twenty-five
20#
63.5*8-18
Twenty
20#
152*40
Fifteen
20#
203*35
Thirty
45#
146*28
Ten
45#
203*25
Thirty
20#
73*8-18
Twenty-five
20#
159*20
Twenty
20#
203*38
Twenty
45#
146*30
Twenty
45#
203*28
Twenty
20#
76*8-25
Twenty-five
20#
159*28
Twenty
20#
203*40
Thirty
45#
146*32
Fifteen
45#
203*30
Thirty
20#
80*8-25
Twenty-five
20#
159*30
Twenty-five
20#
203*45
Thirty
45#
146*35
Fifteen
45#
203*32
Twenty-five
20#
83*8-25
Twenty-five
20#
159*32
Twenty
20#
203*50
Twenty
45#
146*38
Ten
45#
203*35
Twenty-five
20#
95*8-28
Twenty-eight
20#
159*35
Fifteen
20#
203*55
Twenty
45#
146*40
Ten
45#
203*40
Thirty
20#
102*25
Twenty-five
20#
159*40
Fifteen
20#
203*60
Twenty
45#
146*45
Ten
45#
203*45
Thirty
20#
102*28
Twenty
20#
159*45
Thirty
20#
219*20
Twenty
45#
152*28
Fifteen
45#
203*50
Twenty
20#
102*30
Twenty-five
20#
168*25
Twenty
20#
219*22
Twenty
45#
152*30
Fifteen
45#
203*55
Twenty
20#
108*28
Twenty
20#
168*28
Twenty
20#
219*25
Twenty-five
45#
152*35
Fifteen
45#
203*60
Twenty
20#
108*30
Twenty-five
20#
168*30
Twenty
20#
219*28
Twenty-five
45#
152*40
Fifteen
45#
219*20
Sixty
20#
114*25
Twenty
20#
168*32
Twenty
20#
219*30
Sixty
45#
152*45
Ten
45#
219*25
Fifty
20#
114*28
Twenty-five
20#
168*35
Twenty-five
20#
219*32
Thirty
45#
159*18
Twenty-five
45#
219*28
Thirty-five
20#
114*30
Twenty-five
20#
168*40
Fifteen
20#
219*35
Sixty
45#
159*28
Fifteen
45#
219*30
Sixty
20#
114*32
Twenty
20#
168*45
Fifteen
20#
219*38
Thirty
45#
159*30
Fifteen
45#
219*32
Fifty
20#
121*28
Fifteen
20#
168*50
Twenty
20#
219*40
Sixty
45#
159*32
Fifteen
45#
219*35
Sixty
20#
121*30
Twenty-five
20#
180*20
Twenty
20#
219*45
Thirty
45#
159*35
Fifteen
45#
219*40
Forty
20#
121*32
Twenty
20#
180*25
Twenty
20#
219*50
Thirty
45#
159*40
Fifteen
45#
219*45
Thirty-five
20#
121*35
Twenty-five
20#
180*28
Fifteen
20#
219*55
Thirty
45#
159*45
Fifteen
45#
219*50
Thirty
20#
127*28
Thirty
20#
168*35
Twenty-five
20#
219*60
Twenty
45#
168*22
Twenty-five
45#
219*55
Twenty
20#
127*30
Twenty-five
20#
168*40
Fifteen
45#
102*25
Twenty
45#
168*25
Twenty
45#
219*60
Twenty-five
20#
127*32
Twenty
20#
168*45
Fifteen
45#
102*28
Twenty
45#
168*28
Fifteen
20#
127*35
Twenty-eight
20#
168*50
Twenty
45#
102*30
Twenty
45#
168*30
Fifteen
20#
133*25
Twenty-eight
20#
180*20
Twenty
45#
108*30
Twenty
45#
168*32
Fifteen
20#
133*28
Twenty
20#
180*25
Twenty
45#
114*25
Twenty
45#
168*35
Fifteen
20#
133*30
Thirty
20#
180*28
Fifteen
45#
114*28
Fifteen
45#
168*40
Twenty
20#
133*32
Twenty-eight
20#
180*30
Twenty-five
45#
114*30
Fifteen
45#
168*45
Twenty
20#
133*35
Twenty-nine
20#
180*32
Twenty
45#
114*32
Fifteen
45#
168*50
Twenty
20#
140*25
Fifteen
20#
180*35
Fifteen
45#
121*28
Fifteen
45#
180*25
Twenty
20#
140*28
Fifteen
20#
180*40
Fifteen
45#
121*30
Fifteen
45#
180*28
Fifty
20#
140*30
Thirty
20#
180*45
Fifteen
45#
121*32
Fifteen
45#*
180*30
Thirty-five
20#
140*32
Twenty-eight
20#
180*50
Twenty
45#
121*35
Fifteen
45#
180*32
Thirty-five
20#
140*35
Thirty
20#
194*20
Ten
45#
127*28
Twenty
45#
180*35
Forty
20#
140*38
Ten
20#
194*22
Ten
45#
127*30
Twenty
45#
180*40
Forty
20#
140*40
Fifteen
20#
194*25
Twenty-five
45#
127*32
Twenty
45#
180*45
Twenty
20#
140*45
Ten
20#
194*28
Twenty-five
45#
127*35
Twenty
45#
180*50
Twenty
20#
146*28
Twenty
20#
194*30
Twenty
45#
133*25
Thirty
45#
194*20
Twenty
20#
146*30
Fifteen
20#
194*32
Thirty
45#
133*28
Fifteen
45#
194*22
Twenty
20#
146*32
Twenty-five
20#
194*35
Thirty
45#
133*30
Twenty
45#
194*25
Twenty-five
20#
146*35
Thirty
20#
194*38
Twenty
45#
133*32
Fifteen
45#
194*28
Fifteen
20#
146*38
Fifteen
20#
194*40
Fifty
45#
133*35
Twenty
45#
194*30
Thirty

How To identification thick-walled steel pipe

  1. And thick wall steel tube easy folding.
  2. And thick wall steel pipe appearance often pitted phenomenon.
  3. Thick wall steel pipe surface easy generation scarring.
  4. Fake wood surface easy to crack.
  5. And thick wall pipe is easy to scratch.
  6. And thick wall steel pipe without metallic luster, reddish or similar iron color.
  7. And inferior transverse stiffened thick wall steel tube fine and low, often filled phenomenon.
  8. The cross section of 8. and thick wall steel pipe oval.
  9. And thick wall steel material containing impurities, the density of steel is too small.
  10. And thick wall steel tube diameter fluctuation.
  11. High quality tube trademark and printing are standard.
  12. Three more than 16 of the large diameter steel pipe thread, the distance between two trademark in more than IM.
  13. The longitudinal reinforcement 14. inferior steel rebar often wavy.
  14. And thick wall steel pipe manufacturers are not driving, so pack loose. The side of the oval.

Source: China Seamless Steel Pipe Manufacturer – Yaang Pipe Industry Co., Limited (www.steeljrv.com)

(Yaang Pipe Industry is a leading manufacturer and supplier of nickel alloy and stainless steel products, including Super Duplex Stainless Steel Flanges, Stainless Steel Flanges, Stainless Steel Pipe Fittings, Stainless Steel Pipe. Yaang products are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining, Sewage treatment, Natural gas and Pressure vessels and other industries.)

If you want to have more information about the article or you want to share your opinion with us, contact us at sales@steeljrv.com

Please notice that you might be interested in the other technical articles we’ve published:

  • How to get high quality stainless steel pipes

  • What is the difference between a steel pipe and a steel tube

  • Engineering Specification for Pressure Test of Piping System

  • How To Distinguish Inferior Steel Pipe

  • How to get high quality steel pipes

  • Manufacturing process of cold rolled steel pipe

  • How to get high quality boiler tubes

  • How to get high quality flanges

  • How to get high quality alloy steel pipes

  • How to get high quality pipe fittings

  • How to get high quality heat exchanger tubes

  • The difference between steel tubes and steel pipes

  • THE DIFFERENCE BETWEEN STEEL TUBES AND STEEL PIPES

  • Difference between welded steel pipe and seamless steel pipe

  • Characteristics of seamless steel pipes

Reference:

  • https://www.yaang.com

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