Work Item
ASTM WK87396

Revision of A335/A335M-23 Standard Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service


Revise UNS number for Grade P91 Type 1 and 2 from K91560 to K90901. Per the 13th Edition of Metals and Alloys in the Unified Numbering System, K91560 has been replaced by K90901 and is no longer active. See ASTM A182/A82M, ASTM A213/A213, and ASTM A387/A387M as examples where the correct UNS number for Grade 91 Types 1 and 2 is K90901.


Developed by Subcommittee: A01.10

Committee: A01

Staff Manager: W Scott Orthey

Work Item Status

Date Initiated: 08-09-2023

Technical Contact: Keith Hottle

Item: 000