Heat treatment for manufacturing spring steel excellent in high-

Details Heat treatment for manufacturing spring steel excellent in high- Heat treatment for manufacturing spring steel excellent in high-

1993-01-13

1994-03-15

Dean, R.

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

148624, 148654, 148506, C21D 902

Patent

active

052942716

ABSTRACT:
The high-temperature relaxation resistance of spring steel is improved by providing a specified composition of the steel, and subjecting that steel composition to a controlled heat treatment. The high-temperature relaxation resistance, which can not be estimated from the mechanical properties (e.g. strength and hardness) of steel materials at an ordinary temperature, is improved by these conditions which the inventors have found out from many experiments. Especially, the temper-softening resistance is enhanced by an increase of the Si content. The density of dislocation is lowered by providing fine carbides (MO.sub.2 C) serving as inhibitors for the migration of dislocation. These are precipitated by a controlled heat treatment without reducing hardness in the tempered state. Consequently, the obtained spring steel can be used operated in a high-temperature environment for a long time without a deterioration in its properties.

REFERENCES:
patent: 4174981 (1979-11-01), Cassell
patent: 4196025 (1980-04-01), Davies
patent: 4407681 (1983-10-01), Ina et al.
patent: 4673433 (1987-06-01), Roberts

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