Method of producing a high strength steel having uniform elongat

Details Method of producing a high strength steel having uniform elongat Method of producing a high strength steel having uniform elongat

1976-03-19

1977-07-05

Steiner, Arthur J.

Metal treatment

Compositions

Heat treating

75123M, 148 36, 148134, C21D 600, C21D 714

Patent

active

040337898

ABSTRACT:
A steel product having a combination of high strength and formability (as measured by percent tensile uniform elongation) is produced by austenitizing a steel consisting essentially of from 0.04 to 0.17% carbon, 0.8 to 2.0% manganese, up to 1.0% silicon, up to 0.12% vanadium, up to 0.1% columbium, up to an effective amount of titanium to form titanium carbonitrides, 0.001 to 0.025% nitrogen, balance essentially iron and then cooling at a rate of no more than about 70.degree. F/sec. to about 850.degree. F and at a rate of more than about 10.degree. F/sec. to transform the freshly formed austenite to a microstructure of from 10 to 35% by volume of martensite and/or lower bainite (MLB), balance essentially proeutectoid ferrite. Slower cooling rates may be employed to obtain the desired microstructure if a restricted chemical composition is used. The heat-treated steel product is characterized by an ultimate tensile strength of 80,000 p.s.i. minimum and a uniform elongation of 16% minimum.

REFERENCES:
patent: 3625780 (1971-12-01), Bosch et al.
patent: 3830669 (1974-08-01), Matsuoka et al.
patent: 3902927 (1975-09-01), Pernstal
Hayami; "A Family of High-Strength, Cold-Rolled Steels," 10/75, Micro Alloying 75, pp. 78-87.
Rashid; "GM 980X-A Unique High Strength Sheet Steel With Superior Formability," Soc. of Auto. Engr. Inc., Feb., 1976.

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