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用预先热处理的材料生产长杆高强度双头螺柱新工艺 ,消除了长杆的热处理变形 ,降低了机械性能的不稳定性 ,提高了产品质量及螺纹联接的可靠性。
The use of pre-heat-treated material to produce a new technology of high strength studs for long rods eliminates the need for heat treatment of the long rods, reduces the instability of the mechanical properties and improves product quality and the reliability of the screw connections.