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ASTM A312 Stainless Steel Pipe
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ASTM A312 Stainless Steel Pipe, ASTM A312 Welded Pipe, ASTM A312 Seamless Pipe, ASTM A312 Material, ASTM A312 TP316l Pipes, ASTM A312 Standard 316L Pipe, ASTM A312 UNS S31254, ASTM A312 Pipe tolerances, ASTM A312 Pipe Dimensions



 



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 is widely used in oil and gas, petrochemical, food processing, pharmaceutical, and many other industries where pipes are exposed to high temperature and corrosive environments.



 





ASTM A312 stainless steel pipe standard:


  • 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


 



ASTM A312 SS Pipe Fabrication



1. 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.



 



2. 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.



 



3. 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.



 



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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