Large diameter high strength rolled steel bar and a process for

Details Large diameter high strength rolled steel bar and a process for Large diameter high strength rolled steel bar and a process for

1987-02-24

1988-10-04

Yee, Deborah

Metal treatment

Compositions

Heat treating

148 12F, 148 123, 148320, 148328, 148333, C21D 806

Patent

active

047754290

ABSTRACT:
A large diameter high strength hot rolled steel bar consisting of a low alloy steel having a carbon content of 0.3 to 0.9% and a metallurgical structure with a interlammelar spacing of 0.05 to 0.15 .mu.m, and having a diameter of at least 20 mm, a tensile strength of at least 120 kg/mm.sup.2 and a reduction of area of at least 20% is produced by a process comprising cooling a hot rolled steel bar at a constant rate, characterized by carrying out the cooling in such a controlled manner that the perlite transformation is started at a temperature of ranging from Tc to (Tc+40.degree. C.) wherein Tc is the critical temperature at which a cooling curve at a constant rate is tangent to the perlite transformation starting line of the continuous cooling transformation curve and the maximum temperature during the transformation is suppressed to at most (Tc+80.degree. C.).

REFERENCES:
patent: 4046600 (1977-09-01), Yamakoshi et al.
patent: 4123296 (1978-10-01), Yamakoshi et al.
patent: 4426236 (1984-01-01), Sugino et al.

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