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Stainless Steel For Sulfuric Acid Systems
Pipe Standard: ASTM A312, ASTM A790 Plate Standard: ASTM A240 Grade: 304, 304L, 316, 316L, 310, 904L,
6%Mo (UNS S31254, N08367, N08926), 7%Mo (S32654), 4%Si(S30600), 5%Si(S30601, S32615), S6%(S38815),
2205 (S32205), 2550 (S32550), 7-Mo Plus (S32950)
Stainless Steel Pipes, Tubes, Plates and Sheets for Sulfuric Acid Systems
Type: Pipes, Plates
Pipe Standard: ASTM A312, ASTM A790
Plate Standard: ASTM A240
Grade: 304, 304L, 316, 316L, 310, 904L, 6%Mo (UNS S31254, N08367, N08926), 7%Mo (S32654),
4%Si(S30600), 5%Si(S30601, S32615), S6%(S38815), 2205 (S32205), 2550 (S32550),
7-Mo Plus (S32950)
Pipe Size: NPS 1/2" - 56"
Pipe Thickness: SCH 5S, 10S, 40S, 80S
Plate Dimension: Width 1000 - 4000mm x Length 1000 - 12000mm x Thickness 3 - 80mm
| Nominal composition, % | ASTM Spec.b | |||||||
| UNS |
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| Plate | Pipe |
Alloy | number a | Ni | C | Cr | Mo | Cu | Fe | ||
Austenitic stainless steels | |||||||||
304 | S30400 | 8 | 0.04 | 18 | - | - | Bal | A240 | A312 |
304L | S30403 | 8 | 0.02 | 18 | - | - | Bal | A240 | A312 |
316 | S31600 | 10 | 0.04 | 16.5 | 2.1 | - | Bal | A240 | A312 |
316L | S31603 | 10 | 0.02 | 16.5 | 2.1 | - | Bal | A240 | A312 |
CF8M | J92900 | 10 | 0.04 | 19 | 2.3 | - | Bal | - | - |
310 | S31000 | 21 | 0.05 | 25 | - | - | Bal | A240 | A312 |
20 | N08020 | 33 | 0.02 | 19.5 | 2.2 | 3.2 | Bal | A240 | B729 |
CN7M | N08007 | 29 | 0.04 | 20 | 2.3 | 3.5 | Bal | - | - |
904L | N08904 | 24 | 0.01 | 20 | 4.5 | 1.5 | Bal | A240 | A312 |
6%Moc | S31254 | 18 | 0.01 | 20 | 6.2 | 0.7 | Bal | A240 | A312 |
6%Moc | N08367 | 24 | 0.01 | 21 | 6.2 | - | Bal | A240 | A312 |
6%Moc | N08926 | 25 | 0.01 | 20.5 | 6.2 | 1 | Bal | A240 | A312 |
7%Mo | S32654 | 22 | 0.01 | 24 | 7.3 | 0.5 | Bal | A240 | A312 |
4% Sid | S30600 | 15 | 0.01 | 17.5 | 0.1 | 0.3 | Bal | A240 | A312 |
5% Sid | S30601 | 17.5 | 0.01 | 17.5 | 0.1 | 0.2 | Bal | A240 | A312 |
5% Sid | S32615 | 20 | 0.04 | 18 | 1 | 2 | Bal | A240 | A312 |
6% Sid | S38815 | 15 | 0.02 | 14 | 1 | 1 | Bal | A240 | A312 |
Duplex stainless steel | |||||||||
2205 | S32205 | 5 | 0.02 | 22 | 3.2 | - | Bal | A240 | A790 |
255 | S32550 | 5.5 | 0.02 | 25 | 3.5 | 2 | Bal | A240 | A790 |
7-Mo Plus | S32950 | 4 | 0.03 | 27.5 | 2 | - | Bal | A240 | A790 |
CD4MCu | J93370 | 5 | 0.2 | 25 | 2 | 3 | Bal | - | - |
a - UNS numbers beginning with an “N” indicate a nickel alloy, but the definition of a nickel alloy is different
than that used by ASTM.
b - in ASTM specifications, most nickel alloys fall into the “B” specifications. However, due to a redefinition of
a nickel alloy, a few alloys such as 800 and 20 are being reclassified as stainless steels and will be included in
the “A” specifications. That work is still in progress.
c - the 6%Mo alloys are a series of stainless steels, many of which are proprietary, all with roughly 6%Mo
content and roughly equivalent in performance.
d - the austenitic stainless steels with high Si are proprietary and were developed from nitric acid grades for
use in strong sulphuric acid.
