Production process of high-performance bolt
A production process, high-performance technology, applied in the direction of screws, manufacturing tools, threaded fasteners, etc., can solve the problems that the production process cannot meet the requirements, the requirements of strength, hardness and impact resistance are very strict, and achieve good lubricity. , strong anti-corrosion ability, fine phosphating film effect
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Embodiment 1
[0022] The production process of high-performance bolts for nuclear power plants, the process flow is blank preparation-heat treatment-flaw detection inspection-surface treatment.
[0023] Using 42CrMoE steel as raw material, the chemical composition mass percentage is: C content 0.405%, Si content 0.23%, Mn content 0.78%, P content 0.012%, S content 0.013%, Cr content 0.94%, Mo content 0.17%, the balance is Fe. Raw material production inspection, blanking, plane chamfering, heat treatment, thread blank diameter grinding, thread rolling.
[0024] The heat treatment process quenches and tempers bolts < 0.5M and bolts ≥ 0.5M respectively. Bolts with a length of less than 0.5M are quenched in a mesh belt furnace with alloy steel quenching oil as the medium, the quenching temperature is 850°C, and the holding time is 2 hours. After quenching, continue tempering in the mesh belt furnace, the tempering temperature is 680°C, and the holding time is 2.5 hours.
[0025] Bolts with a...
Embodiment 2
[0028] The raw materials and process flow of this embodiment are the same as those in Embodiment 1, except that in the heat treatment process, for bolts with a length <0.5M, the quenching temperature is 860° C., and the holding time is 2 hours. After quenching, continue tempering in the mesh belt furnace, the tempering temperature is 630°C, and the holding time is 2.5 hours.
[0029] Bolts with a length ≥ 0.5M are quenched in a pit furnace with mechanical oil as the medium, the quenching temperature is 860°C, and the holding time is 2.5 hours. After quenching, continue to temper in the pit furnace, the tempering temperature is 630°C, and the time is 3 hours.
Embodiment 3
[0031] The process flow of this embodiment is the same as that of Embodiment 1, the difference is the raw materials and heat treatment process.
[0032] Using 42CrMoE steel as raw material, the chemical composition mass percentage is: C content 0.38%, Si content 0.10%, Mn content 0.75%, P content 0.025%, S content 0.015%, Cr content 0.80%, Mo content 0.15%, the balance is Fe.
[0033] For bolts with a length less than 0.5M, the quenching temperature is 860°C and the holding time is 2 hours. After quenching, continue tempering in the mesh belt furnace, the tempering temperature is 620°C, and the holding time is 2.5 hours.
[0034] Bolts with a length ≥ 0.5M are quenched in a pit furnace with mechanical oil as the medium, the quenching temperature is 860°C, and the holding time is 2.5 hours. After quenching, continue to temper in the pit furnace, the tempering temperature is 620°C, and the time is 3 hours.
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