Method of making as-hot-rolled plate

Details Method of making as-hot-rolled plate Method of making as-hot-rolled plate

1981-09-14

1983-08-09

Skiff, Peter K.

Metal treatment

Compositions

Heat treating

148 124, C21D 802

Patent

active

043976980

ABSTRACT:
A new precipitation hardened, high strength plate product has been developed that attains 80 ksi minimum strength together with excellent toughness, high formability and weldability without heat treatment or the need to cool at rates faster than air cooling. The optimum mechanical properties are achieved by a critical balance of carbon in the range of from 0.20-0.26%, manganese in the range of from 1.0-1.7%, vanadium in the range of from 0.08-0.20%, and at least one of from 0.01 to 0.025 nitrogen and from 0.01 to 0.10 columbium, processing the steel to obtain interphase precipitation strengthening, and by a controlled rolling procedure in which there is no substantial rolling below the Ar.sub.3 temperature.

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