Why were the grades for duplex steel removed in GB/T14976-2012?

2015-10-27View Original

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This post was last edited by joeonshore on 2015-10-27 at 10:15. GB/T14976-2012 removed the grades for duplex steel and related information; so which standard should be referred to when choosing 2205 duplex steel pipes? Urgent, waiting for a reply.

Reply #22015-10-27

There is a standard for duplex stainless steel: “GB-T 21833-2008 Austenitic-ferritic duplex stainless steel seamless pipes””

Reply #32015-10-27

For duplex steel standards, see above. In my opinion, the reason for removing duplex steel from the new GB/T 14976 is simply that it was formulated with reference to ASTM A269, ASTM A312, and ASTM A268; thus, the duplex steel types that are not included in those standards were removed. The standard GB/T 21833 for double-phase steel pipes is based on ASTM A789 and ASTM A790.

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Why were the grades for duplex steel removed in GB/T14976-2012?

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