Method for producing high strength steel with good ductility

Details Method for producing high strength steel with good ductility Method for producing high strength steel with good ductility

1985-08-27

1986-03-18

Stallard, Wayland

Metal treatment

Compositions

Heat treating

C21D 714

Patent

active

045766550

ABSTRACT:
The present invention provides a method for producing hot rolled steel products having high strength and ductility. The method is particularly suitable for low alloy structural steels which contain about 0.02 to 0.15 wt. % C and 0.100 to about 0.015% Nb, the higher Nb percentage being used for steels with the lower C content and vice versa. In the method, the steel is heated to a temperature of about 1150.degree. to about 1250.degree. C. The steel is then rolled during a first sequence of passes so that the average austenite grain size at the end of the first sequence stays below about 50 um and so that the last pass in this sequence is conducted within the temperature range of about 950.degree. to 1100.degree. C. In a second rolling sequence directly following the first sequence, the rolling is continued with further reductions that do not exceed about 15% in each pass. Subsequently, the steel may be cooled to ambient temperature in a conventional manner.

REFERENCES:
patent: 3826691 (1974-07-01), Melloy et al.
patent: 3849206 (1974-11-01), Ishizaki et al.
patent: 4115155 (1978-09-01), Roe
patent: 4395296 (1983-07-01), Abrams
patent: 4406711 (1983-09-01), Nagumo et al.
Tanaka et al., "Three Stages of the Controlled-Rolling Process", Micro Alloying 75, Session 1, Conference in Wash., D.C., Oct. 1-3, 1975, pp. 88-99.
Heedman et al., "Controlled Rolling of Plates with Forced Water Cooling During Rolling", Metals Technology, Sep. 1981, pp. 352-360.

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