What is seamless carbon steel pipe?

The seamless carbon steel pipe is formed by perforating a steel ingot or a solid tube blank, and then hot rolled, cold rolled or cold drawn. Seamless carbon steel pipe plays an important role in China’s steel pipe industry. According to incomplete statistics, there are more than 240 seamless carbon steel pipe production enterprises in China, and there are more than 250 seamless carbon steel pipe units with an annual production capacity of more than 4.5 million tons. From the caliber, <φ76, accounting for 35%, <φ159-650, accounting for 25%. In terms of varieties, general-purpose pipes are 1.9 million tons, accounting for 54%; oil pipes are 760,000 tons, accounting for 5.7%; hydraulic props and precision pipes are 150,000 tons, accounting for 4.3%; stainless steel pipes, bearing pipes and automobile pipes are 50,000 yuan. Tons, accounting for 1.4%.
The raw material of the seamless carbon steel pipe is a round tube blank, which is cut into a blank having a length of about 1 m by a cutting machine, and sent to a furnace for heating through a conveyor belt. The billet is fed into a furnace and heated to a temperature of approximately 1200 degrees celsius. The fuel is hydrogen or acetylene. Furnace temperature control is a critical issue. After the round tube blank is released, it is subjected to a through-hole punching machine. The more common perforating machine is a conical roller punching machine. This perforating machine has high production efficiency, good product quality, large diameter of perforation and can wear a variety of steel types. After perforation, the round billet is successively rolled, rolled or extruded by three rolls. After extrusion, the tube should be sizing. The sizing machine is rotated at a high speed by a conical drill bit into a steel core to form a steel pipe. The inner diameter of the steel pipe is determined by the outer diameter of the sizing machine drill bit. After the steel pipe has been sized, it enters the cooling tower and is cooled by water spray. After the steel pipe is cooled, it is straightened. After the steel pipe is straightened, it is sent to a metal flaw detector (or water pressure test) by a conveyor belt for internal flaw detection. If there are cracks inside the steel pipe, bubbles and other problems will be detected. After the quality inspection of the steel pipe, it must be carefully selected by hand. After the quality inspection of the steel pipe, the paint is sprayed with the number, specification, production batch number, etc. It is hoisted into the warehouse by a crane.

Specifications and classification of seamless carbon steel pipe
The specifications of the seamless steel pipes are expressed by the outer diameter * wall thickness in millimeters.
Classification of seamless carbon steel pipes: seamless steel pipes are divided into hot-rolled and cold-rolled (dial) seamless steel pipes.
Hot-rolled seamless steel pipes are divided into general steel pipes, low and medium pressure boiler steel pipes, high pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, geological steel pipes and other steel pipes.
Cold-rolled (dial) seamless steel pipe in addition to general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler pipe, alloy steel pipe, stainless steel pipe, petroleum cracking pipe, other steel pipes, also includes carbon thin-walled steel pipe, alloy thin-walled steel pipe, Stainless thin-walled steel pipe and special-shaped steel pipe. The outer diameter of hot-rolled seamless pipe is generally larger than 32mm, the wall thickness is 2.5-75mm, the diameter of cold-rolled seamless steel pipe can reach 6mm, the wall thickness can reach 0.25mm, the outer diameter of thin-walled pipe can reach 5mm, and the wall thickness is less than 0.25mm. Cold rolling is more accurate than hot rolling.
Generally seamless carbon steel pipe: It is made of high-alloy carbon steel such as 16Mn, 5MnV, such as 10, 20, 30, 35, 45, etc., or hot-rolled or cold-rolled alloy steel such as 40Cr, 30CrMnSi, 45Mn2, 40MnB. Seamless pipes made of low carbon steel such as 10 and 20 are mainly used for fluid conveying pipes. 45, 40Cr and other medium carbon steel seamless pipes are used to make mechanical parts, such as the force parts of automobiles and tractors. Generally, seamless steel pipes are required to ensure strength and flattening test. The hot rolled steel pipe is delivered in a hot rolled state or a heat treated state; the cold rolling is delivered in a heat treated state.
Seamless steel tubes for low and medium pressure boilers: used in the manufacture of various low and medium pressure boilers, superheated steam pipes, boiling water pipes, water wall pipes and superheated steam pipes for locomotive boilers, large smoke pipes, small smoke pipes and arch brick pipes. Hot-rolled or cold-rolled (dial) seamless steel tubes are made of high-quality carbon structural steel. It is mainly made of steel No. 10 and No. 20. In addition to ensuring chemical composition and mechanical properties, it is required to carry out hydraulic test, crimping, flaring and flattening. Hot rolling is delivered in a hot rolled state, and cold rolled (dial) is delivered in a heat treated state.
High-pressure boiler steel pipe: high-quality carbon structural steel, alloy structural steel and stainless heat-resistant steel seamless steel pipe mainly used for steam boiler pipes for high pressure and above. These boiler pipes are often operated under high temperature and high pressure. The tube will also oxidize and corrode under the action of high temperature flue gas and water vapor. Therefore, the steel pipe is required to have high durability, high oxidation resistance and good structural stability. The steel grade is: high quality carbon structure. Steel steel has 20G, 20MnG, 25MnG; alloy structural steel No. 15MoG, 20MoG, 12CrMoG, 15CrMoG, 12Cr2MoG, 12CrMoVG, 12Cr3MoVSiTiB, etc.; rust-resistant heat-resistant steel commonly used 1Cr18Ni9, 1Cr18Ni11Nb high-pressure boiler tube to ensure chemical composition and mechanical properties It is necessary to do the hydraulic test one by one, and to make the flaring and flattening test. The steel pipe is delivered in a heat treated state. In addition, there are certain requirements for the microstructure, grain size and decarburization layer of the finished steel pipe.
Seamless steel pipes for geological drilling and oil drilling: Drilling wells for drilling underground structures, groundwater, oil, natural gas and mineral resources. Oil and natural gas mining is inseparable from drilling wells. Seamless steel pipes for oil drilling for geological drilling are the main equipment for drilling, mainly including core outer tubes, core inner tubes, casings and drill pipes. Because the drilling pipe is deep enough to work in a depth of several kilometers, the working conditions are extremely complicated, and the drill pipe is subjected to stress such as tension, pressure, bending, torsion and unbalanced impact load, and is also subject to mud and rock wear. Therefore, the pipe is required. Must have sufficient strength, hardness, wear resistance and impact toughness, steel for steel pipe with “DZ” (geological Chinese pinyin prefix) plus number one for steel yield point, commonly used steel number DZ45 45MnB, 50Mn; 40Mn2, 40Mn2Si of DZ50; 40Mn2Mo, 40MnVB of DZ55; 40MnMoB of DZ60, 27MnMoVB of DZ65. The steel pipes are delivered in a heat treated state.

Petroleum cracking tubes: seamless tubes for furnace tubes, heat exchanger tubes and pipes used in petroleum refineries. It is made of high quality carbon steel (10, 20), alloy steel (12CrMo, 15CrMo), heat resistant steel (12Cr2Mo, 15Cr5Mo), stainless steel (1Cr18Ni9, 1Cr18Ni9Ti). In addition to the chemical composition and various mechanical properties, the steel pipe must also ensure water pressure, flattening, flaring and other tests, as well as surface quality and non-destructive testing. The steel pipe is delivered under heat treatment. Stainless steel pipe: stainless steel pipe with various stainless steel hot-rolled and cold-rolled steel. It is widely used in petroleum, chemical equipment pipelines and stainless steel structural parts for various purposes. In addition to ensuring chemical composition and mechanical properties, it is used as a steel pipe subjected to fluid pressure. To ensure that the water pressure test is qualified. All kinds of special steel pipes should be guaranteed according to the regulations.

ASTM/ASME A/SA-106 Grades B & C are utilized for services ranging from structural supports to steam drum headers with temperature ranges up to 800 Fahrenheit  while API 5L X Grades 42 thru 70 are utilized for the water and petroleum industry to transport liquids or as platforms on off shore rigs.

Heavy Wall Seamless Carbon Pipe Size:

  • 1/2inch Nominal to 24inch O.D. Seamless Pipe
  • Wall Thicknesses – Schedule 40 up to 4inch

Standard Carbon Steel Pipe Specifications & Grades

  • A/SA-106 – Grades B & C
  • A/SA-53 Seamless – Grade B
High Yield Carbon Steel Pipe Specifications & Grades
  • API5L Seamless – Grades B (X42, X52, X60, X65 and above)
High Yield Carbon Steel Flanges & Fittings
  • High Yield Butt Weld Fittings: A- 860 or MSS SP75
  • WPHY42 (Y52, Y56, Y60, Y65)
  • High Yield Flanges: A-694 (F42, F52, F56, F60, F-65)
According to the purposes enumerated seamless steel pipe
  • Seamless Carbon and Alloy Mechanical Tubing
  • Seamless Carbon and Alloy Pressure Tube, all grades including T9, T23, T91, Multi-Lead Rifled
  • Seamless carbon and alloy pressure pipe
  • Seamless Quench and Temper Tubing
  • Shapes: Squares, Hex, Combination Shapes (i.e. Round OD with Hex ID) and many other unique shapes

Steel Stand and Steel Grade

  • Plain Carbon Grades 1012 to 1060 inclusive
  • Popular Resulfurized and Free Machining Grades, including 1118, 1119 mod, 1137 and 1141
  • Alloy Grades include the following: T2, T5, T9, T11, T12, T22, T23, T91, (T92 is in development)
  • 15xx, 23xx, 4130, 41xx, 4140, 4141, 4340, 46xx, 48xx, 50xx, 5140, 51xx, 61xx, 6330, 63xx, 8617, 8620, 86xx, 87xx, 93xx 13 Chrome, 9 Chrome

ASTM A179 seamless carbon steel tube

ASTM A179 seamless carbon steel tube - What is seamless carbon steel pipe?

ASTM A179 steel tube covers minimum-wall thickness, seamless cold-drawn low-carbon steel tubes for tubular heat exchangers, condensers, and similar heat transfer apparatus. A179 Cold drawn steel pipe shall be made by the seamless process and shall be cold drawn. 

ASTM A179 cold drawn steel tube - What is seamless carbon steel pipe?
This pipe shall be made by the cold drawn process

Heat and product analysis shall be performed wherein steel materials shall conform to required chemical compositions of carbon, manganese, phosphorus, and sulfur.

Chemistry Composition:
C, %
Mn, %
P, %
S, %
0.06-0.18
0.27-0.63
0.035 max
0.035 max
Mechanical Properties:
Tensile Strength, MPa
Yield Strength, MPa
Elongation, %
Hardness, HRB
325 min
180 min
35 min
72 max

A179 black steel pipe minimum carbon content is 0.06%. The seamless steel tube minimum tensile strength of 325MPa, yield strength of 180MPa.The minimum elongation of A179 seamless pipe is 20%.

ASTM A179 seamless carbon steel tube Application

A179 seamless steel pipe is widely used in industries such as petroleum, chemical, medical, food, light industry, machinery, instrument, include industrial pipeline and mechanical structure parts, etc.

Standard:ASTM A179


Delivery time : 
Promptly ( Stock) or 10-40 days (Production) 
Stock : some are Available MTC: Available

Main ASTM A179 seamless carbon steel tube.

This is an effective way of metal corrosion, the use of the main features are the following:
1. ASTM A179 cold drawn seamless pipe manufacturers with thick dense dense zinc layer covered in the cold drawn seamless tube surface, it can avoid cold drawn seamless tube matrix and any contact with the corrosion solution to protect the steel matrix from corrosion. In the general atmosphere, the surface of the zinc layer to form a layer of thin and dense zinc oxide surface, it is difficult to dissolve in water, so the steel matrix plays a protective role. If zinc oxide and other components of the atmosphere produce insoluble zinc salt, the anti-corrosion effect is more desirable.
2. With iron – zinc alloy layer, combined with dense, and with the unique anti-corrosion in the marine atmosphere and atmospheric atmosphere.
3. ASTM A179 cold drawn seamless pipe with a strong wear resistance due to the combination of solid, zinc – iron miscible.
4. Since zinc has good ductility, its alloy layer and steel base attached to a solid, so hot-rolled parts can be cold, rolling, drawing, bending and other molding without damage to the coating.
5. Hot-dip galvanized structural steel pipe, the equivalent of an annealing treatment, can effectively improve the mechanical properties of steel matrix to eliminate the steel forming welding stress, is conducive to the steel structure for turning.
6. The surface of cold drawn seamless pipe after hot galvanized is bright and beautiful.
7. Pure zinc layer is the most hot galvanized layer of galvanized layer, its nature is basically close to pure zinc, with ductility, so it is full of flexibility.

Outside Diameter & Tolerance of ASTM A179 seamless carbon steel tube
Outside Diameter, mm
Tolerance, mm
3.2≤OD<25.4
±0.10
25.4≤OD≤38.1
±0.15
38.1<OD<50.8
±0.20
50.8≤OD<63.5
±0.25
63.5≤OD<76.2
±0.30
76.2
±0.38
Wall thickness & Tolerance of ASTM A179 seamless carbon steel tube
Outside Diamter, mm
Tolerance, %

3.2≤OD<38.1

+20/-0
38.1≤OD≤76.2
+22/-0

Length: 5800mm; 6000mm; 6096mm; 7315mm; 11800mm; and so on.
Max length: 27000mm, also U bending can be offered.

ASTM A106/A106M Seamless Carbon Steel Pipe & Tube

ASTM A106 / A106M – 11 Standard Specification for Seamless Carbon Steel Pipe for High-Temperature Service

ASTM A106 pipe (also covered in ASME specifications as S/A 106) is the standard specification for seamless carbon steel pipe for high-temperature service. Most common uses are in refineries and plants when gasses or fluids are transported at high temperatures and pressures.

Description

1.Standards: ASTM A106 (ASME SA106) 
2.Products mainly used: ASTM A106 pipes for transportation
3.The main products of steel / steel grade: Gr.A; Gr.B; Gr.C. 
4.Specifications: diameter: 10.3 to 114.3 mm thickness: 0.8 to 12 mm Length: 6 m above, and, in accordance with customer demand, supply and other specifications of steel pipe. 

Carbon Steel Pipe Features Specifications
O.D.(mm) Wall Thickness Unit(mm)
2 2.5 3 3.5 4 4.5 5 6 6.5-7 7.5-8 8.5-9 9.5-10 11 12
Φ25-Φ28
Φ32
Φ34-Φ36
Φ38
Φ40
Φ42
Φ45
Φ48-Φ60
Φ63.5
Φ68-Φ73
Φ76
Φ80
Φ83
Φ89
Φ95
Φ102
Φ108
Φ114
Φ121
Φ127
Φ133
Φ140
Φ146
Φ152
Φ159
Φ168
Grade and Chemical Composition (%)
Grade C≤ Mn P≤ S≤ Si≥ Cr≤ Cu≤ Mo≤ Ni≤ V≤
A 0.25 0.27-0.93 0.035 0.035 0.10 0.40 0.40 0.15 0.40 0.08
B 0.30 0.29-1.06 0.035 0.035 0.10 0.40 0.40 0.15 0.40 0.08
C 0.35 0.29-1.06 0.035 0.035 0.10 0.40 0.40 0.15 0.40 0.08
Mechanical Properties
Grade Rm Mpa Tensile Strength Yield Point (Mpa) Elongation Delivery Condition
A ≥330 ≥205 20 Annealed
B ≥415 ≥240 20 Annealed
C ≥485 ≥275 20 Annealed
Dimension Tolerances
Pipe Type Pipe Sizes Tolerances
Cold Drawn OD ≤48.3mm ±0.40mm
≥60.3mm ±1%mm
WT ±12.5%

ASTM A519 Seamless Steel Mechanical Tubing

ASTM A519 carbon and alloy steel mechanical tubing - What is seamless carbon steel pipe?

ASTM A519 specification covers for several grades of carbon and alloy steel mechanical tubing, either hot-finished or cold-finished.

Heat analysis

An analysis of each heat of steel shall be made by the steel manufacturer to determine the percentages of the elements specified; if secondary melting processes are used, the heat analysis shall be obtained from one remelted ingot or the product of one remelted ingot of each primary melt.

The heat analysis shall conform to the requirements specified, except that where the heat identity has not been maintained or where the analysis is not sufficiently complete to permit conformance to be determined, the chemical composition determined from a product analysis made by the tubular manufacturer shall conform to the requirements specified for heat analysis. When requested in the order or contract, a report of such analyses shall be furnished to the purchaser.

Coating

When specified, steel prior to shipment should be greased to prevent rusting. If the order is not specified in the shipment oiled steel, coated with a layer of oil production should remain on the surface. If the order is not specified in oiled side response is required during transport rusty responsibility. Unless otherwise specified, the manufacturer can be arbitrary inner and outer surfaces of the pipe coated with anti-rust oil. 

Chemical component
 Grade  C  Mn  P  S  Si  Cr  Mo
 4118  0.18-0.23  0.70-0.90  0.035  0.040  0.15-0.35  0.40-0.60  0.08-0.15
 4130  0.28-0.33  0.40-0.60  0.035  0.040  0.15-0.35  0.80-1.10  0.15-0.25
 4135  0.33-0.38  0.70-0.90  0.035  0.040  0.15-0.35  0.80-1.10  0.15-0.25
 4140  0.40-0.45  0.75-1.0  0.035  0.040  0.15-0.35  0.80-1.10  0.15-0.25
Mechanical properties
 Grade  Tenslle strength(Mpa)  Yield strength(Mpa)  Elongation(%)  RB
 4118  685  885  12  197
 4130  785  930  12  229
 4135  835  980  12  229
 4140  930  1080  12  217
Dimension Tolerances
Pipe Type

Pipe Sizes

Tolerances

Cold Drawn

OD

≤48.3mm

±0.40mm

WT

≥60.3mm

±1%mm

JIS G3454,G3455,G3456 Carbon steel pipes

JIS G3454,G3455,G3456 Carbon steel pipes for pressure, high pressure and high temperature service

JIS G3454 - What is seamless carbon steel pipe?

JIS G3454

JIS G3454 DN80 SCH60 - What is seamless carbon steel pipe?

JIS G3454 DN80 SCH60

Carbon steel pipes for pressure service, high pressure service and high temperature service.

Standard:
  • JIS G3454 Carbon steel pipes for pressure service at an approximate maximum temperature of 350℃.
  • JIS G3455 Carbon steel pipes for high pressure service at an approximate maximum temperature of 350℃.
  • JIS G3456 Carbon steel pipes for high temperature service at a temperature over 350℃.
Size (mm):

Outer Dimensions: 19.05mm ~ 114.3mm
Wall Thickness:2.0mm ~ 14 mm
Length: max 16000mm

Application: Carbon steel pipes for pressure service, high pressure service and high temperature service.

The main products of steel / steel grade:
  • JIS G3454(STPG370, STPG410)
  • JIS G3455(STS370, STS410, STS480)
  • JIS G3456(STPT370, STPT410, STPT480)

Packing: Bare/bundles/crates/crate protection at the both sides of tubes or as per customers’ requirements .
Painting: as requested.

Chemical Compositions(%):
Standard Grade C Si Mn P S
JIS G3454 STPG370 ≤0.25 ≤0.35 0.30-0.90 ≤0.040 ≤0.040
STPG410 ≤0.30 ≤0.35 0.30-1.00 ≤0.040 ≤0.040
JIS G3455 STS370 ≤0.25 0.10-0.35 0.30-1.10 ≤0.035 ≤0.035
STS410 ≤0.30 0.10-0.35 0.30-1.40 ≤0.035 ≤0.035
STS480 ≤0.33 0.10-0.35 0.30-1.50 ≤0.035 ≤0.035
JIS G3456 STPT370 ≤0.25 0.10-0.35 0.30-0.90 ≤0.035 ≤0.035
STPT410 ≤0.30 0.10-0.35 0.30-1.00 ≤0.035 ≤0.035
STPT480 ≤0.33 0.10-0.35 0.30-1.00 ≤0.035 ≤0.035
Mechanical Properties:
Standard Grade Yield Strength (Mpa) Tensile Strength (Mpa) Elongation (%)
JIS G3454 STPG370 ≥216 ≥370 ≥30
STPG410 ≥245 ≥410 ≥25
JIS G3455 STS370 ≥216 ≥370 ≥30
STS410 ≥245 ≥410 ≥25
STS480 ≥275 ≥480 ≥25
JIS G3456 STPT370 ≥216 ≥370 ≥30
STPT410 ≥245 ≥410 ≥25
STPT480 ≥275 ≥480 ≥25

The tubes shall be manufactured by seamless process, electric resistance welding process, or butt welding process, and those of other grades shall be manufactured by seamless process or electric resistance welding process. The tube shall be as manufactured or as cold-finished condition, or they shall be subjected to appropriate heat treatment.

The tubes shall be practically straight. and the two ends shall be at right angles to the axis of the tube. The tubes shall be free from defects detrimental to practical use.

JIS G3445 steel tubes for machine structural purposes

JIS G3445 Carbon steel tubes - What is seamless carbon steel pipe?

JIS G3445 is Japanese Industrial Standard specifies the carbon steel tubes, hereinafter referred to as the “tubes”, used for machinery, automobiles, bicycles, furniture, appliances and other machine parts.

Standards: JIS G3445

Size (mm):

  • Outer Dimensions: 19.05mm ~ 114.3mm
  • Wall Thickness:2.0mm ~ 14 mm
  • Length: max 16000mm

Application: Tubes used for machinery, automobiles, bicycles, furniture, appliances and other machine parts.

The main products of steel / steel grade:
  • STKM11A, STKM12(A,B,C)
  • STKM13(A,B,C)
  • STKM14(A,B,C)

Packing: 
Bare/bundles/crates/crate protection at the both sides of tubes or as per customers’ requirements .

Painting: as requested.

Chemical Compositions(%):
Grade C Si Mn P S
STKM11A ≤0.12 ≤0.35 ≤0.60 ≤0.040 ≤0.040
STKM12A ≤0.20 ≤0.35 ≤0.60 ≤0.040 ≤0.040
STKM12B ≤0.20 ≤0.35 ≤0.60 ≤0.040 ≤0.040
STKM12C ≤0.20 ≤0.35 ≤0.60 ≤0.040 ≤0.040
STKM13A ≤0.25 ≤0.35 0.30-0.90 ≤0.040 ≤0.040
STKM13B ≤0.25 ≤0.35 0.30-0.90 ≤0.040 ≤0.040
STKM13C ≤0.25 ≤0.35 0.30-0.90 ≤0.040 ≤0.040
STKM14A ≤0.30 ≤0.35 0.30-1.00 ≤0.040 ≤0.040
STKM14B ≤0.30 ≤0.35 0.30-1.00 ≤0.040 ≤0.040
STKM14C ≤0.30 ≤0.35 0.30-1.00 ≤0.040 ≤0.040
Mechanical Properties:
Grade Yield Strength (Mpa) Tensile Strength (Mpa) Elongation (%)
STKM11A \ ≥290 ≥35
STKM12A ≥175 ≥340 ≥35
STKM12B ≥275 ≥390 ≥25
STKM12C ≥355 ≥470 ≥20
STKM13A ≥215 ≥370 ≥30
STKM13B ≥305 ≥440 ≥20
STKM13C ≥380 ≥510 ≥15
STKM14A ≥245 ≥410 ≥25
STKM14B ≥355 ≥500 ≥15
STKM14C ≥410 ≥550 ≥15

JIS G3461,G3462 boiler and heat exchanger tubes

JIS G3461 - What is seamless carbon steel pipe?

JIS G3461,G3462 Carbon steel/Alloy steel boiler and heat exchanger tubes used for exchanging heat on the inside and outside of the tube, such as water tubes, smoke tubes, superherater tubes, air preheater tubes, etc.

Standard:
  • JIS G3461 Carbon steel boiler and heat exchanger tubes
  • JIS G3462 Alloy steel boiler and heat exchanger tubes

jis 3461 - What is seamless carbon steel pipe?

Size (mm):

Outer Dimensions: 19.05mm ~ 168.3mm
Wall Thickness:2.0mm ~ 14 mm
Length: max 19000mm

Application:

Used for exchanging heat on the inside and outside of the tube, such as water tubes, smoke tubes, superherater tubes, air preheater tubes, etc. of boilers, and heat exchanger industries. it is not applicable to the steel tubes for heating furnace and those for heat exchangers for low temperature service.

The main products of steel / steel grade:
  • G3461(STB340, STB410, STB510)
  • G3462(STBA22, STBA23).

Packing: Bare/bundles/crates/crate protection at the both sides of tubes or as per customers’ requirements.
Painting: as requested.

Chemical Compositions(%):
Grade C Si Mn P S Cr Mo
STB340 ≤0.18 ≤0.35 0.30-0.60 ≤0.035 ≤0.035 / /
STB410 ≤0.32 ≤0.35 0.30-0.80 ≤0.035 ≤0.035 / /
STB510 ≤0.25 ≤0.35 1.00-1.50 ≤0.035 ≤0.035 / /
STBA22 ≤0.15 ≤0.50 0.30-0.60 ≤0.035 ≤0.035 0.80-1.25 0.45-0.65
STBA23 ≤0.15 0.50-1.00 0.30-0.60 ≤0.030 ≤0.030 1.00-1.50 0.45-0.65
Mechanical Properties:
Grade Yield Strength (Mpa) Tensile Strength (Mpa) Elongation (%)
STB340 ≥175 ≥340 ≥35
STB410 ≥255 ≥410 ≥25
STB510 ≥295 ≥510 ≥25
STBA22 ≥206 ≥412 ≥30
STBA23 ≥206 ≥412 ≥30

DIN 1629 carbon seamless steel pipes

DIN 1629 seamless pipe - What is seamless carbon steel pipe?

Marking

DIN 1629 is the standard specifies the Seamless Circular Tubes of Non Alloys Steels with Special Quality Requirements.

DIN 1629 applications the overheated boilers, as minimum thickness ferrite and seamless steel pipes, and as heat exchangers via austenitic pipes.

Application:

It is used for manufacturing pipeline,vessel,equipment,pipe fittings.

The main products of steel / steel grade:
  • DIN1629 ST37.0
  • DIN1629 ST44.0
  • DIN1629 ST52.0

Packing: Bare/bundles/crates/crate protection at the both sides of tubes or as per customers’ requirements .

Size range(mm):
  • Out diameter:10-324mm
  • Wall Tickness:1-30mm
  • Length:14000mm max

Note:
DN — Nominal Diameter
NPS —Nominal Pipe Size 

Chemical Compositions(%) of DIN1629
Grade C Si Mn P S
ST37.0 ≤0.17 / / ≤0.040 ≤0.040
ST44.0 ≤0.21 / / ≤0.040 ≤0.040
ST52.0 ≤0.22 ≤0.55 ≤1.70 ≤0.040 ≤0.035
Mechanical Properties of DIN1629
Grade Yield Strength 
(Mpa)
Tensile Strength 
(Mpa)
Elongation
(%)L
Elongation 
(%)T
ST37.0 ≥235 350-480 25 23
ST44.0 ≥275 420-550 21 19
ST52.0 ≥355 500-650 21 19

Please note the meaning of below abbreviation in table 2:

  • HR—-Hot Rolled
  • CW—-Cold Worked
  • SR—-Stress Relieved
  • A—-Annealed
  • N—-Normalized

Seamless carbon steel pipe hardness test method

Carbon Steel Seamless Pipes - What is seamless carbon steel pipe?

Inner diameter of seamless steel pipe is more than 6.0mm and wall thickness is less than 13mm annealed seamless steel pipe material, which can be used W-B75 Webster Hardness test with very fast, easy, suitable for rapid non-destructive of the seamless steel pipe material qualified inspection. Inner diameter of seamless steel pipe is greater than 30mm and wall thickness greater than 1.2mm seamless steel tubes, using a Rockwell hardness test HRB, HRC hardness.

Inner diameter of seamless steel pipe is greater than 30mm, wall thickness less than 1.2mm of seamless steel tubes, Rockwell superficial hardness test hardness of HRT or HRN. Diameter less than 0mm, more than 4.8mm of seamless steel pipe, pipe dedicated Rockwell hardness test HR15T hardness. When the seamless steel pipe inner diameter greater than 26mm, you can also use the Rockwell or the Rockwell superficial hardness test hardness of the pipe wall.

The tensile test uses carbon steel pipes made of samples, sample in the tensile test machine will pull to fracture, then the determination of one or several mechanical properties, usually only the determination of tensile strength, yield strength, percentage elongation and section shrinkage. The tensile test the mechanical properties of metal materials, the basic test methods, almost all metallic materials, as long as the mechanical properties required to provide a tensile test. Especially those who shape is not easy material hardness test, tensile test to become only the mechanical properties testing means. The hardness test is a hard indenter prescribed conditions slowly pressed into the surface of the sample, and then test the indentation depth or size, in order to determine the size of the material hardness. The hardness test is the mechanical performance test with the easiest, fastest and most easy to implement. Hardness test is non-destructive, the approximate conversion relationship between hardness and tensile strength values. The material’s hardness value can be converted into the tensile strength values, it has great practical significance.

Tensile test is not easy to test the strength is very convenient, so people are increasingly test hardness and less test its strength, and hardness conversion. Hardness manufacturing technology continues to progress and innovation, the original can not directly test the hardness of materials, such as seamless steel pipe, stainless steel plate and stainless steel bands, now may directly test the hardness of the Therefore, there is a hardness test is gradually replaced by the trend of the tensile test. The hardness test of the stainless steel to take into account its mechanical properties, performance and quality of this is related to the deformation of stainless steel as raw materials, stamping, cutting and other processing. Therefore, all seamless steel tubes for mechanical properties testing. Mechanical properties of the test method is mainly divided into two categories, a tensile test, hardness test.

Most of which are national standards in stainless steel also provides the tensile test and hardness test. For those not easy for hardness testing of materials, such as seamless steel pipe only requires that the tensile test. Stainless steel standard, general provisions of the cloth, Luo, Victoria three hardness test method, determination of the HB, HRB (HRC) and the HV hardness value, the provisions of the three hardness values only for one can be. Especially the newly developed portable superficial Rockwell hardness tester, pipe Rockwell hardness tester can be as thin as 0.05mm stainless steel plate, stainless steel with a thin to 4.8mm seamless steel tubes for fast, accurate hardness testing, making difficult to resolve domestic problems solved.

Pressure and Temperature Ratings of ASTM A106 Grade B Carbon Steel Pipes

Pressure (psig) and temperature (deg F) ratings of ASTM A106 Grade B carbon steel pipes – temperatures ranging 100 oF – 750 oF

Ratings are given for standard seamless pipes at temperatures ranging 100 oF – 750 oF. Ratings in psig based on ANSI/ASME B 31.1.

Maximum Allowable Pressure (psig)
Pipe Size
(inches)
Pipe Schedule Temperature (oF)
100 200 300 400 500 600 650 700 750
1/2″ 401) 3730 3730 3730 3730 3730 3730 3730 3581 3233
802) 5252 5252 5252 5252 5252 5252 5252 5042 4552
160 6920 6920 6920 6920 6920 6920 6920 6643 5997
3/4″ 40 2447 3059 3059 3059 3059 3059 3059 2937 2651
80 4299 4299 4299 4299 4299 4299 4299 4127 3725
160 6393 6393 6393 6393 6393 6393 6393 6137 5541
1″ 40 2857 2857 2857 2857 2857 2857 2857 2743 2476
80 3950 3950 3950 3950 3950 3950 3950 3792 3423
160 5757 5757 5757 5757 5757 5757 5757 5526 4989
1 1/2″ 40 2116 2116 2116 2116 2116 2116 2116 2032 1834
80 2983 2983 2983 2983 2983 2983 2983 2864 2585
160 4331 4331 4331 4331 4331 4331 4331 4157 3753
2″ 40 1783 1783 1783 1783 1783 1783 1783 1712 1545
80 2575 2575 2575 2575 2575 2575 2575 2472 2232
160 4217 4217 4217 4217 4217 4217 4217 4049 3655
3″ 40 1693 1693 1693 1693 1693 1693 1693 1625 1467
80 2394 2394 2394 2394 2394 2394 2394 2298 2074
160 3600 3600 3600 3600 3600 3600 3600 3456 3120
4″ 40 1435 1435 1435 1435 1435 1435 1435 1378 1244
80 2075 2075 2075 2075 2075 2075 2075 1992 1798
160 3376 3376 3376 3376 3376 3376 3376 3241 2926
5″ 40 1258 1258 1258 1258 1258 1258 1258 1208 1090
80 1857 1857 1857 1857 1857 1857 1857 1783 1610
160 3201 3201 3201 3201 3201 3201 3201 3073 2774
6″ 40 1143 1143 1143 1143 1143 1143 1143 1098 991
80 1794 1794 1794 1794 1794 1794 1794 1722 1554
160 3083 3083 3083 3083 3083 3083 3083 2960 2672
8″ 40 1006 1006 1006 1006 1006 1006 1006 966 872
80 1586 1586 1586 1586 1586 1586 1586 1523 1375
160 2976 2976 2976 2976 2976 2976 2976 2857 2579
10″ 40 913 913 913 913 913 913 913 876 791
80 1509 1509 1509 1509 1509 1509 1509 1448 1308
160 2950 2950 2950 2950 2950 2950 2950 2832 2557
12″ 40 855 855 855 855 855 855 855 819 741

  • 1) STD (standard) = schedule 40
  • 2) XS (extra strong) = schedule 80

Seven warriors in category of seamless carbon steel pipe
No doubt that we can be called the warriors among the seamless steel pipe. Combined with the material of carbon, we can even change our mechanical characters to serve you better. Welcome to have a meeting with you guys here.
First one, this is our seamless steel pipe. With its special steel pipe’s type, it can be used among high temperature fluids transmission, such as gas, water, oil and steam. Of course, specific standard and grade question, you can send us an email or just talk online.
Secondly, we would talk about API 5L line pipe. Line pipe, mainly used among pipeline transportation in petroleum and natural gas industries. With high quality ends, surface, and packing dealing, you would be content for the work of API 5L line pipe.
Thirdly, it is structural steel pipe. With the characters of structural points, we would mainly used them among structural engineering and construction industry. According to its special specification, standard, ends and surface, there is no result that you would fall in love with it. 
Except for seamless steel pipe, API 5L line pipe and structural steel pipe, there are also precision steel tube, boiler tube, seamless mechanical tubing and seamless hydraulic tubing. And the latter would be the main point for today’s topic.
Fourth, how could we forget precision steel tube. They are working on mechanical structures, hydraulic equipment, and automatic parts. You can ask us for details if you need this kind of products by chance.
Fifth, boiler tube would be an friend for us during the whole engineering project. This kind of tube would be seen at high pressure fluid transmission(such as heat exchanger, boiler, condenser).
Sixth, another seamless steel pipe-seamless mechanical tubing. We are not strange with seamless one, so emailed us if you need.
Last is seamless hydraulic tubing. We can see them in high pressure tubing and hydraulic cylinder. 

Source: China Steel Pipes 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:

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

  • Engineering Specification for Pressure Test of Piping System

  • Manufacturing process of cold rolled steel pipe

  • How to get high quality alloy steel pipes

  • HOW TO GET HIGH QUALITY STEEL PIPES

  • How to get high quality carbon steel pipes

  • The standard and application of stainless steel seamless pipe and welded pipe

  • How To Distinguish Inferior Steel Pipe

  • HOW TO GET HIGH QUALITY BOILER TUBES

  • API 5L Specification for Line Pipe

  • What is the Meaning of API 5L Pipe

References:

  • https://www.yaang.com

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