Process for producing a rolled steel product having high weldabi

Details Process for producing a rolled steel product having high weldabi Process for producing a rolled steel product having high weldabi

1985-01-28

1986-08-12

Stallard, Wayland

Metal treatment

Compositions

Heat treating

148 12F, C21D 714, C21D 952

Patent

active

046054499

ABSTRACT:
A process for producing rolled steel products, especially reinforcing rod for concrete or other elements to be encased in concrete and having good weldability, a high yield strength and high energy absorption for the Charpy V impact test at very low temperatures comprising forming a silicon and aluminum containing steel whose carbon content (C), manganese content (MN), and niobium content (NB) are related by the relationship set forth below. The steel blank is rolled so that the last three passes result in more than 20% of the total cross section reduction, these rolling passes are carried out so that the temperature T1 before, the temperature T2 during, and the temperature T3 after rolling are also related to the diameter D in the manner set forth below to yield a high yield strength LE and a high energy absorption expressed as KCV at -120.degree. C. The relationships are:

REFERENCES:
patent: 3811873 (1974-05-01), de Barbadillo, II
patent: 3926687 (1975-12-01), Gondo et al.
patent: 4175985 (1979-11-01), Blondelot et al.
patent: 4272305 (1981-06-01), Weingerl et al.
Simoneau et al., "Modified Charpy Hammer Simulation of Steckel Mill Rolling of Nb Microalloyed Steels", Metals Technology, Nov. 1980, pp. 456-464.
Schummer, "Microalloyed Steels for Hot-Rolled and Cold-Formed Shapes and Concrete-Reinforcing Bars", Micro Alloying 75, Conference held Oct. 1-3, 1975, Washington, D.C., Session 2A, pp. 48-55.

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