GB/T 21833 — Seamless austenitic-ferritic (duplex) stainless steel tubes and pipes
GB/T 21833 covers seamless duplex stainless steel pipe and tube, such as S22053 and S25073 — comparable to ASTM A790.
GB/T 21833 at a glance
| Standard | GB/T 21833 |
|---|---|
| Issued by | China (SAC) |
| Product form | Pipe |
| Grades on this site | 4 |
GB/T 21833 grades and their ASTM equivalents
| GB/T designation | Nearest ASTM / ASME grades | UNS | W.Nr |
|---|---|---|---|
| S22253 / S22053 (022Cr22Ni5Mo3N / 022Cr23Ni5Mo3N) | ASTM A182 F51, ASTM A182 F60 (Duplex 2205), ASTM A815 WPS31803, ASTM A815 WPS32205, ASTM A790 UNS S31803, ASTM A790 UNS S32205 | S31803 | 1.4462 |
| S25073 (022Cr25Ni7Mo4N) | ASTM A182 F53 (Super Duplex 2507), ASTM A815 WPS32750, ASTM A790 UNS S32750 | S32750 | 1.4410 |
| S27603 (022Cr25Ni7Mo4WCuN) | ASTM A182 F55 (Super Duplex S32760), ASTM A815 WPS32760, ASTM A790 UNS S32760 | S32760 | 1.4501 |
| S25554 (03Cr25Ni6Mo3Cu2N) | ASTM A182 F61 (Alloy 255) | S32550 | 1.4507 |
Equivalents are the nearest commonly cited grades. Chemistry, mechanical properties and testing differ between standards — compare them before substituting one for another.
FAQ
GB/T 21833: common questions
What is the ASTM equivalent of GB/T 21833 S22253 / S22053?
The nearest ASTM grades are ASTM A182 F51, ASTM A182 F60 (Duplex 2205), ASTM A815 WPS31803, ASTM A815 WPS32205.
Does Teshi Group supply material to GB/T 21833?
Teshi Group manufactures flanges, fittings, fasteners and valves, and supplies pipes and plates, to ASTM / ASME specifications and to equivalent EN, JIS, GB and IS standards on request, with EN 10204 3.1 certificates. Send your requirement to info@teshigroup.com.
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