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煤矿机械所用的螺纹套形状尺寸见图1,所用材料为45钢,其主要化学成分(质量分数,%)为0.43C、0.31S、i0.67Mn、0.030S、0.031P、余量Fe,45钢的供货态为热轧态。螺纹套产品技术要求调质后硬度为220~260 HBS,调质组织为回火索氏体+少量铁素体,组织等级为1~4级。45钢螺纹套在以前的
The size and shape of the threaded sleeve used in coal mining machinery are shown in Fig.1. The material used is 45 steel. The main chemical composition (mass fraction,%) is 0.43C, 0.31S, i0.67Mn, 0.030S, 0.031P, balance Fe, 45 Steel supply status for the hot-rolled state. Threaded sleeve product technical requirements after quenching and tempering hardness of 220 ~ 260 HBS, tempered tissue tempered sorbite + a small amount of ferrite, the organization level of 1 to 4. 45 steel threaded sleeve in the previous