Method of manufacturing high strength low alloys steel plates wi

Details Method of manufacturing high strength low alloys steel plates wi Method of manufacturing high strength low alloys steel plates wi

1978-07-11

1980-01-22

Stallard, W.

Metal treatment

Compositions

Heat treating

148 124, 148 36, C21D 120

Patent

active

041848985

ABSTRACT:
A steel slab or bloom containing 0.3.about.0.15% by weight of C, 0.05.about.0.60% by weight of Si, 0.60.about.2.5% by weight of Mn, 0.010.about.0.15% by weight of Nb, 0.005.about.0.10% by weight of soluble Al and the remainder of iron is heated to such a temperature region above 1050.degree. C. and below the reheating temperature where the austenitic grain size would be 150.mu.. The heated slab or bloom is then hot rolled with total rolling reduction of more than 40% with respect to a finished thickness at the non-recrystallized austenitic region and the hot rolled stocks are subjected to accelerated cooling at a rate of 5.degree..about.20.degree. C./sec. from a temperature higher than the Ar.sub.3 transformation point to a temperature within 550.degree..about.650.degree. C. Finally the stocks are air cooled.

REFERENCES:
patent: 3787250 (1974-01-01), Korchynsky et al.
patent: 3860456 (1975-01-01), Repas
patent: 4092179 (1978-05-01), Charpentier et al.

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