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从力学性能、热处理性能、加工性能、焊接性能及承受载荷性能等方面对四种合金锻钢（调质）材料进行比较，认为钩舌材质选用４０ＭｎＢ为宜。
The mechanical properties, heat treatment properties, processing properties, weldability and load-bearing properties of the four alloy forgings (quenched) material comparison, that the choice of material for the knuckle 40MnB is appropriate.