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ASTM A312 is the standard specification for seamless, welded, and heavily cold-worked austenitic stainless steel pipes. The ASTM A312 specification covers nominal wall thicknesses and grades of stainless steel typically used in high temperature and general corrosive service applications. These pipes have a high degree of strength, excellent corrosion resistance, excellent high temperature performance and good processability. ASTM A312 stainless steel pipe is widely used in oil and gas, petrochemical, food processing, pharmaceutical and many other industries where pipes are exposed to high temperature and corrosive environment.
- ASTM A312 : Standard Specification for Seamless, Welded, and Heavy Cold Worked Austenitic Stainless Steel Pipes
- The ASTM A312 standard covers various types of stainless steel pipes, including ASTM A312 seamless pipe and ASTM A312 welded pipe, with different grades such as 304, 304L, 316, 316L, 321, 321H, 347, 347H, etc. The ASTM A312 standard also specifies the mechanical properties, dimensions, and tolerances of piping.
Chemical Composition of ASTM A312 Stainless Steel Pipe
Grade | UNS | C≤ | Mn | P≤ | S≤ | Si≤ | Cr | Mo | Ni | Cu |
TP304 | S30400 | 0.08 | 2 | 0.045 | 0.03 | 1 | 18.0-20.0 | - | 8.0-11.0 | - |
TP304L | S30403 | 0.035 | 2 | 0.045 | 0.03 | 1 | 18.0-20.0 | - | 8.0-13.0 | - |
TP316 | S31600 | 0.08 | 2 | 0.045 | 0.03 | 1 | 16.0-18.0 | 2.00-3.00 | 10.0-14.0 | - |
TP316L | S31603 | 0.035 | 2 | 0.045 | 0.03 | 1 | 16.0-18.0 | 2.00-3.00 | 11.0-14.0 | - |
316Ti | S31635 | 0.08 | 2 | 0.045 | 0.03 | 0.75 | 16.0-18.0 | 2.00-3.00 | 10.0-12.0 | - |
TP317 | S31700 | 0.08 | 2 | 0.045 | 0.03 | 1 | 18.0-20.0 | 3.0-4.0 | 11.0-14.0 | - |
TP317L | S31703 | 0.035 | 2 | 0.045 | 0.03 | 1 | 18.0-20.0 | 3.0-4.0 | 11.0-15.0 | - |
TP321 | S32100 | 0.08 | 2 | 0.045 | 0.03 | 1 | 17.0-19.0 | - | 9.0-12.0 | - |
321H | S32109 | 0.04-0.1 | 2 | 0.045 | 0.03 | 1 | 17.0-19.0 | - | 9.0-12.0 | - |
310 | S31000 | 0.25 | 2 | 0.045 | 0.03 | 1.5 | 24.0-26.0 | 0.75 | 19.0-22.0 | - |
TP310S | S31008 | 0.08 | 2 | 0.045 | 0.03 | 1 | 24.0-26.0 | 0.75 | 19.0-22.0 | - |
TP347 | S34700 | 0.08 | 2 | 0.045 | 0.03 | 1 | 17.0-19.0 | - | 9.0-13.0 | - |
254SMO | S31254 | 0.02 | 1 | 0.03 | 0.01 | 0.8 | 19.5-20.5 | 6.0-6.5 | 17.5-18.5 | 0.5-1.0 |
AL-6XN | N08367 | 0.03 | 2 | 0.04 | 0.03 | 1 | 20.0-22.0 | 6.0-7.0 | 23.5-25.5 | 0.75 |
F904L | N08904 | 0.02 | 2 | 0.04 | 0.03 | 1 | 19.0-23.0 | 4.0-5.0 | 23.0-28.0 | 1.0-2.0 |
ASTM A312 Stainless Steel Pipe Mechanical Properties
Mechanical properties | Tensile, min, ksi[MPa】 | Yield, min, ksi[MPa】 | Elongation, %(min) | Hardness, HB(max) |
TP304 | 75【515】 | 30【205】 | 35 | 192 |
TP304L | 70【485】 | 25【170】 | 35 | 192 |
TP316 | 75【515】 | 30【205】 | 35 | 192 |
TP316L | 70【485】 | 25【170】 | 35 | 192 |
316Ti | 75【515】 | 30【205】 | 35 | 192 |
TP317 | 75【515】 | 30【205】 | 35 | 192 |
TP317L | 75【515】 | 30【205】 | 35 | 192 |
TP321 | 75【515】 | 30【205】 | 35 | 192 |
321H | 75【515】 | 30【205】 | 35 | 192 |
TP310 | 75【515】 | 30【205】 | 35 | 192 |
TP310S | 75【515】 | 30【205】 | 35 | 192 |
TP347 | 75【515】 | 30【205】 | 35 | 192 |
S31254 | 98【675】 | 43【310】 | 35 | 220 |
N08367 | 100【690】 | 45【310】 | 30 | 241 |
N08926 | 94【650】 | 43【295】 | 35 | 256 |
N08904 | 71【490】 | 31【215】 | 35 | 192 |
The production process of ASTM A312 stainless steel pipe starts with the selection of high-quality raw materials. Raw materials must meet the requirements of the specification, and there must be no defects such as cracks and seams. Raw materials are then subjected to various tests to ensure their quality, including chemical analysis, mechanical testing and non-destructive testing.
The next step in the production process is the formation of the pipes. This process can be done by two methods: ASME SA312 seamless pipe and ASME SA312 welded pipe. Seamless pipe is formed by perforating a solid billet of stainless steel and then extruding the material through a die into its final shape. Welded pipe is formed by welding two or more pieces of stainless steel together using various welding techniques such as resistance welding, electric fusion welding, etc.
After the pipe is formed, various finishing processes are carried out to meet the specification requirements. These processes include heat treatment, cold working, polishing, etc. Heat treatment is used to improve the mechanical properties of the pipe, such as hardness, strength and toughness. Cold working is used to improve the dimensional accuracy of the tubing, while polishing is used to improve the surface finish.
When purchasing ASTM A312 stainless steel pipe, it is important to ensure that the material meets the required codes and standards to ensure the safety and reliability of the piping system. It is also important to consider specific application requirements to select the proper pipe grade and size. HT PIPE stock ASTM A312 stainless steel pipe.
Nominal Dimensions of Stainless Steel Pipe
DN | NPS | OD(mm) outside diameter |
Sch5S | Sch10S | Sch40S | Sch80S | Sch160S |
6 | 1/8 | 10.3 | - | 1.24 | 1.73 | 2.41 | 3.15 |
8 | 1/4 | 13.7 | - | 1.65 | 2.24 | 3.02 | 3.68 |
10 | 3/8 | 17.1 | - | 1.65 | 2.31 | 3.2 | 4.01 |
15 | 1/2 | 21.3 | 1.65 | 2.11 | 2.77 | 3.73 | 4.78 |
20 | 3/4 | 26.7 | 1.65 | 2.11 | 2.87 | 3.91 | 5.56 |
25 | 1 | 33.4 | 1.65 | 2.77 | 3.38 | 4.55 | 6.35 |
32 | 1 1/4 | 42.2 | 1.65 | 2.77 | 3.56 | 4.85 | 6.35 |
40 | 1 1/2 | 48.3 | 1.65 | 2.77 | 3.68 | 5.08 | 7.14 |
50 | 2 | 60.3 | 1.65 | 2.77 | 3.91 | 5.54 | 8.74 |
65 | 2 1/2 | 73 | 2.11 | 3.05 | 5.16 | 7.01 | 9.52 |
80 | 3 | 88.9 | 2.11 | 3.05 | 5.49 | 7.62 | 11.13 |
90 | 3 1/2 | 101.6 | 2.11 | 3.05 | 5.74 | 8.08 | - |
100 | 4 | 114.3 | 2.11 | 3.05 | 6.02 | 8.56 | 13.49 |
125 | 5 | 141.3 | 2.77 | 3.40 | 6.55 | 9.53 | 15.88 |
150 | 6 | 168.3 | 2.77 | 3.40 | 7.11 | 10.97 | 18.26 |
200 | 8 | 219.1 | 2.77 | 3.76 | 8.18 | 12.7 | - |
250 | 10 | 273.1 | 3.40 | 4.19 | 9.27 | 12.7 | - |
300 | 12 | 323.9 | 3.96 | 4.57 | 9.53 | 12.7 | - |
350 | 14 | 355.6 | 3.96 | 4.78 | 9.53 | 12.7 | - |
400 | 16 | 406.4 | 4.19 | 4.78 | 9.53 | 12.7 | - |
450 | 18 | 457 | 4.19 | 4.78 | 9.53 | 12.7 | - |
500 | 20 | 508 | 4.78 | 5.54 | 9.53 | 12.7 | - |
550 | 22 | 559 | 4.78 | 5.54 | - | - | - |
600 | 24 | 610 | 5.54 | 6.35 | 9.53 | 12.7 | - |
650 | 26 | 660 | - | - | - | - | - |
700 | 28 | 711 | - | - | - | - | - |
750 | 30 | 762 | 6.35 | 7.92 | - | - | - |
ASTM A312 Dimension Tolerance Table
Standard | Outside Diameter (mm) | Thickness(mm) | Length(mm) | ||||
ASTM A312 | 10.29~48.26 | +0.4/-0.8 | +12.5/-12.5 | +6.0/0 | |||
48.26~114.30 | +0.8/-0.8 | ||||||
114.30~219.08 | +1.6/-0.8 | ||||||
219.08~457.20 | +2.4/-0.8 |
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