四螺纹口按国际标准化制造，材料选用38铬钼铝氮化钢，硬度高，使用寿命长。
4 , screw thread gob produced by internation standard , material is 38chrome molybdenum aluminium azote steel , high rigidity , long time.
四螺纹口按国际标准化制造，材料选用38铬钼铝氮化钢，硬度高，使用寿命长。
4 , screw thread gob produced by internation standard , material is 38chrome molybdenum aluminium azote steel , high rigidity , long time.
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