The lower heat-treating temperature of the case results from the fact that hypereutectoid steels are normally austenitized for hardening just above the lower critical point.
2
钢含磷量提高到0．9％以上，控制钢丝的热处理制度，使过共析钢丝强韧性显著提高。
The strength and tenacity of super-eutectoid steel wire have been improved notably by increasing the carbon content of the steel to more than 0.9% and controlling the heat-treatment system.
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