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Heat treatment for manufacturing spring steel excellent in high- temperature relaxation resistance
Heat treatment for manufacturing spring steel excellent in high- temperature relaxation resistance
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机译：用于制造抗高温松弛性能优异的弹簧钢的热处理
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摘要
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.
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