ASTM A213 T11 T12 T21 T22 T91 alloy steel bar
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T11 T12 T21 T22 T91 alloy tubing hot rolled forged steel bar
Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes ASTM A213 covers seamless ferritic and austenitic steel boiler, superheater, and heat-exchanger tubes.
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