发布时间:2025-01-23 06:17:05
题主是否想询问“12.9级螺栓材质”?采用SCM435合金钢材料。12.9级螺丝通常指采用SCM435合金钢材料制造,其最小抗拉强度达到1220Mpa,硬度达到39~44HRC的超高强度螺丝。
有一种乌龟黑色的就只有鸡蛋大小长大了也就一直这么大问是什么品种的曾在江苏徐州见过
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