1. Rationale
For grade T11, successful trials made on several lots of product have shown that subcritical annealing (presently not permitted by the spec) permits to achieve the required mechanical properties and also to obtain creep rupture properties in line with those obtained with the permitted heat treatments. Then subcritical annealing should be permitted for grade T11.
Keywords
alloy steel tubes; austenitic stainless steel; boiler tubes; ferritic stainless steel; heat exchanger tubes; high-temperature applications; seamless steel tubes; steel tubes; superheater tubes; temperature service applications-high; Alloy steel tube--specifications; Austenitic stainless steel tube--specifications; Boiler/superheater tubes--specifications; Condenser and heat exchanger systems--steel; Feedwater heater tubes--specifications; Ferritic steel tube--specifications; Seamless steel tube--specifications; Superheater tubes--specifications; ICS Number Code 23.040.10 (Iron and steel pipes)
Citing ASTM Standards
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