Lowly decarburizable spring steel

Details Lowly decarburizable spring steel Lowly decarburizable spring steel

1998-04-06

1999-09-14

Yee, Deborah

Alloys or metallic compositions

Ferrous

Nickel containing, but 10 percent or less

420 89, 420 90, 420 91, 420 92, 148909, C22C 3808, C22C 3816

Patent

active

059519444

ABSTRACT:
A lowly decarburizable spring steel comprises, on a weight basis, 0.51 to 0.70% of C, 0.15 to 2.50% of Si, 0.40 to 1.20% of Mn, 0.005 to 0.100% of Al, 0.005 to 0.050% of S, at least one of 0.05 to 0.30% of Ni and 0.05 to 1.00% of Cu and, optionally, at least one of 0.20 to 1.50% of Cr, 0.05 to 1.00% of Mo, 0.01 to 0.50% of V, 0.010 to 0.300% of Nb and 0.0005 to 0.0050% of B, and the balance consisting of Fe and unavoidable impurities. The spring steel can be remarkably lowered in decarburizability during hot working and heat treatment thereof without need of any decarburization-proofing agents and any specific heat treatment equipment. Accordingly, it has a very excellent effect in that the decarburization thereof can be remarkably decreased with a low cost when it is applied to a coil spring, a flat spring or a torsion bar.

REFERENCES:
patent: 5118469 (1992-06-01), Abe et al.
patent: 5286312 (1994-02-01), Shionotsusa et al.
patent: 5415711 (1995-05-01), Takagi et al.

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