Process for the manufacture of strong tough steel plates

Details Process for the manufacture of strong tough steel plates Process for the manufacture of strong tough steel plates

1975-09-17

1977-02-15

Stallard, W.

Metal treatment

Compositions

Heat treating

C21D 714

Patent

active

040081036

ABSTRACT:
Strong and tough steel is prepared by heating to a temperature of 800.degree. - 1000.degree. C., preferably from 800.degree. to 950.degree. C., before the rolling step, finish rolling at temperatures within the range of from 680.degree. to 850.degree. C., preferably from 680.degree. to 800.degree. C. and with a reduction ratio in thickness of not less than 30% based on the plate thickness of the steel when the finish rolling is started. It is advantageous to provide for a pretreatment of the steel, said pretreatment including the steps of initially heating the steel to a temperature higher than 1000.degree. C., rolling the heated steel to a suitable intermediate thickness and cooling the rolled steel to a temperature lower than 650.degree. C.
Tempering may also be carried out at a temperature of 500.degree. - 650.degree. C. for 20 minutes -- 2 hours.

REFERENCES:
patent: 3806378 (1974-04-01), Bramfitt et al.

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