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                螺杆

                 橡胶螺杆应具有足够的强度和刚度,螺纹表面应具有良好的耐磨性。螺杆一般优先选用38CrMoAlA制造,也可用40Ct、45钢制造。采用氮化处理时,其渗氮层深度应大于0.3mm,表面硬度不低于HRC62

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