What is a alloy steel pipe?

What is a alloy steel pipe?
Alloy steel pipe is a kind of steel pipe which is named according to its material- alloy steel. It is made by using alloy steal. Just like the origin of the name of welded steel pipe, it is named according to the manufacturing technique of steel pipe. And there are two kinds of steel pipe, one is the welded steel pipe, and the other is the seamless steel pipe.

The Features of Alloy Steel Pipe
Made by superior carbon steel, structural steel and stainless heat resistant steel, alloy steel pipe is formed by hot rolling or cold rolling. And due to the material of alloy steel pipe, it has superior alloy steel pipe features. It can work under the high temperature, high pressure, and it can even endure sulfur attacks, organ acid corrosion. Due to the superior alloy steel pipe features, alloy steel pipe is widely used in making the high temperature super heater, reheated and high pressure boiler in electric plant, nuclear power industry.
Apart from those alloy steel pipe features mentioned above, it also has other obvious alloy steel pipe features. The weight of the alloy steel pipe is extremely light, which is easy to transport and carry. Moreover, it has the same torsional strength as well as flexure strength as solid steel plant. It is economic and it quite saves the cost, which is welcomed by people.
According to the different shapes of cross sectional area, alloy steel pipe is divided into circular pipe and special pipe. And under the condition of the same perimeter, the area of a circle is the biggest, so we can convey more fluid by using circle pipes. In addition, when the annulus cross section bears the external radial pressure or internal radial pressure, the stress of the circle pipe is fairy equal, so most of alloy steel pipes are circular pipes.
The most important feature of alloy steel pipe is that the alloy steel pipe can be recycled 100% so that it is completely accord with the national strategy including environment protection, material saving, and environmental friendly.

Application of Alloy Steel Pipe
As an important element of steel products, alloy steel pipe can be divided into seamless steel pipe and welded steel pipe according to the manufacturing technique and tube billet shape.
Why the application of alloy steel pipe is wider than others
There are many kinds of materials used for transport in industrial production. Specifically we will have more choices and it is not limited to the use of alloy steel pipe. But even in the face of more choices, many people tend to choose alloy steel pipe. People make their own choices will have their own reasons. This means the alloy steel pipe application has its own advantages. Compared with transmission lines made of other materials, after it meets the basic application requirements, its quantity is lighter. Then in the practical application of alloy steel pipe, it will have more advantages because of this. Besides its physical characteristic advantage, it also has economic advantages. The wide application of alloy steel pipe is with kinds of reasons. So in practical usage, we can exploit the advantages to the full, in this way can we get more profits in these applications of alloy steel pipe.
What requirements should alloy steel pipe application meet
The transportation of kinds of gases or liquids in production needs to rely on alloy steel pipe. This shows that the actual role of alloy steel pipe application is important. High temperature resistant and low temperature resistant is the tolerance of temperature. In the practical application of alloy steel pipe, there will be many materials need to be transported. However their temperatures are not the same. So this can be the basic requirement to alloy steel pipe. It needs more corrosion resistance. Corrosion resistant material is the best material during transporting, because it is corrosion resistant. So it can be used in more occasions. And it is definitely very convenient for users.

The Benefits of Alloy Steel Pipes
The main applications of alloy steel pipes is power station, nuclear power plant, high pressure boiler, high temperature superheater and re-heater coil etc. of high temperature pipeline and equipments.
The advantages of alloy steel pipes: 100% recycled, it is suitable for the national strategy of environmental protection, energy-saving and resource-saving. Therefore, the national policy encourages the expansion of the high pressure alloy steel pipe applications. At present, the proportion of the total alloy steel tube is half of the developed countries. The applications of alloy steel pipe provide a broad space for the industry development. According to the research of the China association of special steel alloy pipe expert group, our country’s high pressure alloy steel pipe material demand grows by an average of up to 10-12%.
How do I choose which alloy steel to use? Selecting the right alloy  for a specific application is vitally important in order to achieve a sustainable solution, while cost aspects must also be taken into consideration. There are several stages when material selection needs to be made: new applications and equipment, new processes and process changes, exchange of material due to poor performance, exchange of existing material to minimize cost
To make the right material selection it is important to get a full picture of the service conditions the steel will face. The first aspects to consider could be material related, for example: corrosion resistance, mechanical strength, fabric ability, physical properties, surface aspects.

The Four Most Widely Used Alloy Steel Pipe Grades
The four most widely used grades of alloy steel tubes are 12Cr1MoV, A335, P91, A335, P22, 15CrMoG
12Cr1MoVG alloy steel pipe, A335 P91 alloy steel pipe, A335 P22 alloy tube and 15CrMoG alloy tube, these four grades are the most widely used in alloy tube industry.
There are many types of alloy steel tubes, such as 20MnG, 25MnG, 15CrMoG, 35CrMo, 42CrMo, 12Cr2MoG, 12Cr1MoVG, 12Cr2MoWVTiB, 10Cr9Mo1VNb, 10CrMoAl, 9cr5mo.9cr18mo, SA210A1, SA210C, SA213 T11, SA213 T12, SA213 T22, SA213 T23, SA213 T91, SA213 T92, A335 P9, A335 P11, A335 P12, A335, P22 A335 P23, A335 P91, A335 P92, ST45.8/, 15Mo3, 13CrMo44, 10CrMo910 III.
12Cr1MoV alloy steel pipe is based on high-quality carbon structural steel, the appropriate to join one or several alloy elements, used to improve the mechanical properties of steel, toughness and hardenability. The products made of such steel are usually subjected to heat treatment (normalizing or quenching and tempering); their zero parts are usually subjected to quenching or surface chemical treatment (carburizing, nitriding, etc.) before use, Quenching or high-frequency quenching and other treatment. Therefore, depending on the chemical composition (mainly carbon content), heat treatment process and the use of different, such steel can be divided into carburizing, quenching and tempering and nitriding steel.
A335 P91 alloy steel pipe is a solid tube through the perforated after rolling. A335 P91 alloy tube is widely used. General use of the P91 alloy tube by the ordinary carbon structural steel, low-alloy structural steel or alloy structural steel rolling, the largest output, mainly used for conveying fluid pipe or structural parts.
A335 P22 alloy steel pipe is the use of seamless steel pipe material standards, and UNS 21950 is the same material, but the processing process is not the same. The process flow is: round pipe → heating → perforation → start → annealing → pickling → oil (copper) → multi-pass cold drawn (cold) → billet → heat treatment → straightening → water pressure test (flaw detection) → mark → storage
15CrMoG alloy steel pipe specifications: 8-1240 × 1-200mm, mainly used for low and medium pressure boilers (working pressure is generally not greater than 5.88Mpa, the working temperature below 450 ℃) heating surface pipe; for high pressure boiler (working pressure is generally 9.8Mpa above, the working temperature between 450 ℃ ~ 650 ℃) of the heating surface of the pipe, economizer, superheater, reheater, petrochemical industry, and so on.

ASTM A355 Seamless Alloy Steel Pipe
Astm a335 standard specication for seamless ferritic alloy-steel pipe for high-temperature service. This specication covers nominal(average) wall seam-less alloy-steel pipe intended for high-temperatureservice.Pipe ordered to this specication shall be suitable for bending,anging(vanstoning),and similar forming operations,and for fusion welding.Selection will depend upon design,service conditions,mechanical properties,andhigh-temperature char-acteristics.

Chemical Composition

 Grade  C  Mn  P  S  Si  Mo
 P1  0.10-0.20  0.30-0.80  0.025  0.025  0.10-0.50  0.44-0.65
 P2  0.10-0.20  0.30-0.61  0.025  0.025  0.10-0.30  0.44-0.65
 P5  0.15max  0.30-0.60  0.025  0.025  0.50max  0.45-0.65
 P5b  0.15max  0.30-0.60  0.025  0.025  1.00-2.00  0.45-0.65
 P5c  0.12max  0.30-0.60  0.025  0.025  0.50max  0.45-0.65
 P9  0.15max  0.30-0.60  0.025  0.025  0.25-1.00  0.90-1.10
 P11  0.05-0.15  0.30-0.60  0.025  0.025  0.50-1.00  0.44-0.65
 P12  0.05-0.15  0.30-0.61  0.025  0.025  0.50max  0.44-0.65
 P15  0.05-0.15  0.30-0.60  0.025  0.025  1.15-1.65  0.44-0.65
 P21  0.05-0.15  0.30-0.60  0.025  0.025  0.50max  0.80-1.06
 P22  0.05-0.15  0.30-0.60  0.025  0.025  0.50max  0.87-1.13
 P23  0.04-0.10  0.10-0.60  0.030max  0.010max  0.50max  0.05-1.30

Mechanical Properties

 Mechanical properties  P1,P2  P12  P23  P91  P92,P11  P122
 Tensile strength  380  415  510  585  620  620
 Yield strength  205  220  400  415  440  400

ASTM A213 Alloy Tubes
ASTM A213 Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes  ASTM A213M-09 standard is issued under the fixed designation A 213/A 213M; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision.

A213 T22 Alloy Steel Pipe Cutting Method
A213 T22 alloy steel pipe cutting the main way to cut off the machine, machine cutting, flame cutting, sawing and so on. The characteristics of the pipe cutting equipment are described below.
(1) Pipe cutting machine
Pipe cutting machine equipment is simple, less investment, the application of a wide range, and some also has a groove function and automatic loading and unloading materials and aggregate devices. Pipe cutting machine is a seamless alloy steel pipe finishing line commonly used equipment.
(2) Pipe saws
Pipe saw can be divided into pipe saws, band saws and circular saws and several other forms. Pipeline saws can be cut into multiple rows of steel pipe, high production efficiency, but the equipment structure is complex, high investment; band saw and circular saw production efficiency is low, less investment. The circular saw is suitable for cutting off the smaller diameter A213 T22 alloy steel pipe, while the band saw is used to cut off the larger diameter A213 T22 alloy steel pipe.
(3) Flame cutting
Flame cutting, including oxygen cutting, hydrogen and oxygen cutting and plasma cutting, the cutting method is more suitable for large diameter, thick wall seamless steel pipe cutting. When the plasma is cut, the cutting speed is faster. Due to the high temperature of the flame cutting, there is a heat affected zone near the incision and the port surface is not smooth.
(4) Machine cutting
The efficiency to cut with machine cutting is very low, generally used for sampling and sample preparation.

ASTM A213 T5 Superheater and Heat-Exchanger TubesASTM A213 T5 seamless alloy steel pipe banner - What is a alloy steel pipe?

ASTM A213 T5 Standard covers seamless ferritic and austenitic steel boiler, superheater, and heat-exchanger tubes.

ASTM A213 T5b Seamless alloy tube

ASTM A213 T5b seamless alloy steel pipe banner - What is a alloy steel pipe?

ASTM A213 T5b Standard covers seamless ferritic and austenitic steel boiler, superheater, and heat-exchanger tubes.

ASTM A213 T9 Seamless alloy pipe

ASTM A213 T9 seamless alloy steel pipe banner - What is a alloy steel pipe?

ASTM A213 T9 is the part of ASTM A213 Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, Heat-Exchanger Tubes.

ASTM A213 T11 seamless alloy pipe

ASTM A213 T11 seamless alloy steel pipe banner - What is a alloy steel pipe?

ASTM A213 T91 tubes shall be made by the seamless process and shall be either hot finished or cold finished, as specified.

ASTM A213 T12 seamless alloy pipe

ASTM A213 T12 seamless alloy steel pipes banner - What is a alloy steel pipe?

ASTM A213 T12 is the part of ASTM A213 Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, Heat-Exchanger Tubes.

ASTM A213 T22 alloy pipes

ASTM A213 T22 alloy steel pipe banner - What is a alloy steel pipe?

ASTM A213 T22 is the part of ASTM A213 Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, Heat-Exchanger Tubes.

ASTM A213 T91 Seamless alloy tube

ASTM A213 T91 Seamless alloy tube banner - What is a alloy steel pipe?

ASTM A213 T91 is the part of ASTM A213 Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, Heat-Exchanger Tubes.

ASTM A213 T92 Alloy Steel Seamless Tube

astm a213 t92 alloy steel seamless tube banner - What is a alloy steel pipe?
ASTM A213 T92 Standard covers seamless ferritic and austenitic steel boiler, superheater, and heat-exchanger tubes.

A335 P11 Alloy Steel Pipe Carburizing Effect
Carburizing is a chemical heat treatment technology, carburizing A335 P11 alloy steel surface to obtain carbon content, after quenching and tempering treatment, can ensure that the heart has a certain strength and toughness under the premise of raising P11 Alloy steel pipe surface hardness, wear resistance and fatigue strength, etc., in order to obtain excellent comprehensive mechanical properties.
So the purpose of carburizing after heat treatment is mainly reflected in the following aspects:
① improve the A335 P11 alloy steel pipe surface infiltration layer strength, hardness, wear resistance and fatigue strength;
② to eliminate the infiltration layer in the network of cementite and the appropriate reduction in the number of retained austenite, reduce the brittleness and contribute to A335 P11 alloy steel pipe performance improvement;
③ eliminate the internal stress, increase the size of A335 P11 alloy steel pipe stability, can prevent the quenching Ping turning; to prevent thick-walled A335 P11 alloy steel pipe cutting process caused by the processing of stress caused by the accuracy or size changes;
④ refinement of grain, improve A335 P11 alloy steel pipe toughness. Can withstand the role of heavy loads.

Ways to Measure the Length of ASTM A213 P11 Alloy Steel Pipe
Depending on the process requirements of the manufacturer, ASTM A213 P11 alloy steel pipe has several ways of measuring length. Today I will introduce four main methods of measuring the length of a steel pipe.
1, Grating Length Measurement
The basic principle is that two fixed-length grating scales are respectively arranged on the two outer ends of the steel pipe, and the grating rod is driven by the rodless cylinder to be close to the two ends of the steel pipe to measure the length of the A213 P11 alloy steel pipe by using light interference phenomenon.
Characterized by high accuracy. However, grating scales are expensive and difficult to maintain, and are sensitive to the effects of dust and site vibrations.
2, The Camera Measured Length.
Camera length measurement is the use of image processing to achieve A213 P11 alloy steel pipe length measurement, the principle is in a section of steel pipe roller conveyor to install a series of equidistant photoelectric switch, in the other paragraph plus light source and camera. When the A213 P11 alloy pipe passes through this area, the length of the A213 P11 alloy pipe can be determined by the position of the photo switch on the screen taken by the camera through a camera.
The characteristic is that online measurement can be realized. A213 P11 alloy steel pipe can obtain the length data when it passes the length measuring area without interval. The disadvantage is that if the special light source is not irradiated, the steel pipe will be interfered by the outside light, and after the special light source is used, the steel pipe will have a strong reflection on the pipe after chamfering and will easily cause reading error.
3, Encoder Length Measurement
The principle is installed in the cylinder encoder, the use of fuel tanks to promote movement in the roller on the other side of the installation of a series of equal distance photoelectric switch, when the A213 P11 alloy steel tube is pushed by the cylinder end photoelectric switch, from the record Encoder reading, conversion of cylinder stroke, so you can calculate the length of A213 P11 alloy steel pipe.
Characteristics of the length of the pipe needs to be raised. In addition, photoelectric switch detection there is a certain error, may need to fully measure.
4, Improved Encoder Length Measurement
This method is an indirect method of measuring steel pipe length indirectly by measuring the distance between two end faces of the pipe and their respective reference points. Set at each end of the steel pipe length measuring car 1, the initial position of zero, spacing L. Then move the editor length to the respective pipe end travel distance (L2, L3), L-L2-L3, which is the length of the A213 P11 alloy steel pipe.
This measurement overcomes the A213 P11 alloy steel pipe bulky, complex production site environment, measurement agencies can not cross the lower support steel pipe and other difficulties. This method is easy to operate, measurement accuracy within ± 10mm, repeat accuracy ≤ 5mm.

Testing Method for A335 P11 Alloy Steel Pipe
Quality inspection method for A335 P11 alloy steel pipe
1.A335 P11 alloy steel pipe chemical composition analysis: chemical analysis, instrumental analysis (infrared C-S instrument, direct reading spectrometer, zcP, etc.).
① infrared C-S instrument: analysis of ferroalloy, steelmaking raw materials, steel in the C, S elements.
② direct reading spectrometer: C, Si, Mn, P, S, Cr, Mo, Ni, Cn, A1, W, V, Ti, B, Nb, As, Sn, Sb, Pb, Bi
③ N-0 instrument: gas content analysis N, O
2.A335 P11 alloy steel pipe geometry and shape inspection:
①A335 P11 alloy steel pipe wall thickness check: micrometer, ultrasonic thickness gauge, both ends of not less than 8 points and recorded.
②A335 P11 alloy steel pipe diameter, ovalness check: card gauge, vernier caliper, ring gauge, measured the maximum point, the smallest point.
③A335 P11 alloy steel pipe length inspection: steel tape, artificial, automatic length measurement.
④A335 P11 alloy steel pipe bending check: ruler, level (1m), feeler, thin line per meter curvature, full length of bending.
⑤A335 P11 alloy steel pipe end groove angle and blunt edge check: angle, card board.
3.A335 P11 alloy steel pipe surface quality inspection: 100%
① artificial eye inspection: lighting conditions, standards, experience, logo, steel tube rotation.
② non-destructive testing inspection:
A. Ultrasonic testing UT:
It is sensitive to the surface and internal crack defects of A335 P11 alloy steel pipe.
Standard: ASTM-A335
B. Eddy current testing ET: (electromagnetic induction)
Mainly sensitive to point-like (hole-shaped) defects. Standard: ASTM-A335
C. Magnetic powder MT and magnetic flux leakage detection:
Magnetic flaw detection, suitable for a335 p11 alloy steel pipe surface and near surface defects detection.
Standard: ASTM-A335
D. Electromagnetic ultrasonic testing:
Do not need coupling medium, can be applied to high temperature high speed, coarse A335 P11 alloy steel pipe surface detection.
E. Penetration test:
Fluorescence, coloring, detection of A335 P11 alloy steel pipe surface defects.

A213 T22 Alloy Steel Pipe Cutting Method
A213 T22 alloy steel pipe cutting the main way to cut off the machine, machine cutting, flame cutting, sawing and so on. The characteristics of the pipe cutting equipment are described below.
(1) Pipe cutting machine
Pipe cutting machine equipment is simple, less investment, the application of a wide range, and some also has a groove function and automatic loading and unloading materials and aggregate devices. Pipe cutting machine is a seamless alloy steel pipe finishing line commonly used equipment.
(2) Pipe saws
Pipe saw can be divided into pipe saws, band saws and circular saws and several other forms. Pipeline saws can be cut into multiple rows of steel pipe, high production efficiency, but the equipment structure is complex, high investment; band saw and circular saw production efficiency is low, less investment. The circular saw is suitable for cutting off the smaller diameter A213 T22 alloy steel pipe, while the band saw is used to cut off the larger diameter A213 T22 alloy steel pipe.
(3) Flame cutting
Flame cutting, including oxygen cutting, hydrogen and oxygen cutting and plasma cutting, the cutting method is more suitable for large diameter, thick wall seamless steel pipe cutting. When the plasma is cut, the cutting speed is faster. Due to the high temperature of the flame cutting, there is a heat affected zone near the incision and the port surface is not smooth.
(4) Machine cutting
The efficiency to cut with machine cutting is very low, generally used for sampling and sample preparation.

Source: China Alloy 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

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References:

  1. https://www.yaang.com

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