Preparation method of fastening bolt
A technology for tightening bolts and bolts, applied in the field of preparation of tightening bolts, can solve the problems of easy rust and corrosion, fracture or cracks, and the formation of accident sources, and achieves the effects of not easy to break, moderate hardness, and improved strength
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[0020] The following description serves to disclose the present invention to enable those skilled in the art to carry out the present invention. The preferred embodiments described below are only examples, and those skilled in the art can devise other obvious variations.
[0021] The preparation method of fastening bolts, the processing steps include:
[0022] a. Casting rod material, the weight percentage of each chemical composition of the control rod material should meet the following requirements: C 0.27~0.34, Mn 0.45~0.65, V 0.05-0.15, Si 0.15~0.35, W 0.01-0.04, P≤0.025 , S≤0.025, Ni1.55~2.00, Cr 0.65~0.95, Mo 0.20~0.30, Cu≤0.20;
[0023] b. The rod material after casting is pickled; according to the wire diameter requirements of the bolt, it is drawn to make the rod material shrink to the wire diameter required by the bolt; the rod material after shrinking the wire diameter Cut to the length required by the bolt, put the cut rod material into the mold cavity at room te...
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