A312 Stainless Steel Industrial Pipe

A312 stainless steel industrial pipe is widely used for high temperature service and general service, pipe size from 1/8 inch to 30 inch for outside diameter, covering Austenitic stainless steels, and manufactured both welded and seamless type for option.

Custom grades

TP304, TP304L, TP316, TP316L, TP321, TP317, TP317L, TP347, TP347H, TP310S and more stainless grades.

A312 Stainless Steel Industrial Pipe tolerances

Outside Diameter, NPS Tolerance, Inch
1/8 to 1-1/2, incl over 1/16 under 1/32
over 1-1/2 to 4, incl over 1/32 under 1/32
over 4 to 8, incl over 1/16 under 1/32
over 8 to 18, incl over 3/32 under 1/32
over 18 to 26, incl over 1/8 under 1/32
over 26 to 34, incl over 5/32 under 1/32
over 34 to 48, incl over 3/16 under 1/32
NPS Wall Thickness Tolerance, %
1/8 to 2-1/2 incl., all t/D ratios over 20.2 under 12.5
over 3 to 18 incl., t/D up to 5% incl. over 22.5 under 12.5
over 3 to 18, incl., t/D > 5% over 15.0 under 12.5
20 and large, welded, all t/D ratios over 17.5 under 12.5
20 and large, seamless, t/D up to 5% incl. over 22.5 under 12.5
>20 and large, seamless, t/D > 5% over 15.0 under 12.5

A312 seamless pipe

Pipe should be made from stainless steel billet, no any welding process during manufacturing, seamless pipe has better pressure to withstand, annealing solution and pickling finishing condition, applied for high temperature and corrosion environment.

A312 welded pipe

No additional metal using automatic welding process for welded pipe, made from stainless steel coil, for large diameter pipe, it made from stainless steel plate, both single welding and double welding for option, Dongshang stainless supply cold finished A312 welded pipe.

A312 Stainless Steel Industrial Pipe weight

For Cr – Ni type Austenitic stainless steel pipe, theoretical weight equals to (OD – WTH)WTH x 0.02491 kg per meter.

For Cr – Ni – Mo type Austenitic stainless steel pipe, theoretical weight equals to (OD – WTH)WTH x 0.02507 kg per meter.

Dimensions and chart of A312 welded and seamless pipe

Nominal Size OD Wall Thickness, SCHEDULE
NPS DN mm 5S 10S 40S STD 80S
1∕8 6 10.3 1.24 1.73 1.73 2.41
1∕4 8 13.7 1.65 2.24 2.24 3.02
3∕8 10 17.2 1.65 2.31 2.31 3.2
1∕2 15 21.3 1.65 2.11 2.77 2.77 3.73
3∕4 20 26.7 1.65 2.11 2.87 2.87 3.91
1 25 33.4 1.65 2.77 3.38 3.38 4.55
1 1∕4 32 42.2 1.65 2.77 3.56 3.56 4.85
1 1∕2 40 48.3 1.65 2.77 3.68 3.68 5.08
2 50 60.3 1.65 2.77 3.91 3.91 5.54
2 1∕2 65 73 2.11 3.05 5.16 5.16 7.01
3 80 88.9 2.11 3.05 5.49 5.49 7.62
3 1∕2 90 101.6 2.11 3.05 5.74 5.74 8.08
4 100 114.3 2.11 3.05 6.02 6.02 8.56
5 125 141.3 2.77 3.4 6.55 6.55 9.53
6 150 168.3 2.77 3.4 7.11 7.11 10.97
8 200 219.1 2.77 3.76 8.18 8.18 12.7
10 250 273.1 3.4 4.19 9.27 9.27 12.7
12 300 323.9 3.96 4.57 9.53 9.53 12.7
14 350 355.6 3.96 4.78 9.53
16 400 406.4 4.19 4.78 9.53
18 450 457.2 4.19 4.78 9.53
20 500 508 4.78 5.54 9.53
22 550 558.8 4.78 5.54 9.53
24 600 609.6 5.54 6.35 9.53
26 650 660.4 9.53
28 700 711.2 9.53
30 750 762 6.35 7.92 9.53
A312 stainless steel industrial pipe