Thermal treatment method for ultrahigh carbon steel and product
A heat treatment method and technology for ultra-high carbon steel, applied in the field of heat treatment method and products of ultra-high carbon steel, can solve the problem of difficulty in obtaining austenite, and achieve the effect of increasing stability
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Embodiment 1
[0048] The chemical composition (mass content) of ultra-high carbon steel is: C 1.2-1.6%, Si 1.2-1.8%, Mn 0.3-0.8%, Cr 1.2-1.6%, Ni 0.3-0.8%, Mo 0.2-0.5%. The martensitic transformation start temperature (M s ) and transition end temperature (M f ) are about 133.5°C and -9.2°C, respectively.
[0049] After high-temperature diffusion annealing process: heat preservation at 1100°C for 24 hours, and furnace cooling to room temperature, an ultra-fine pearlite structure without network carbides is obtained.
[0050] Quenching-partitioning-tempering process: heat preservation at 900°C for 30 minutes, then rapid cooling in water at 25°C, immediately heat preservation in a salt bath at 400°C for 15 minutes, and quench in water to obtain treated ultra-high carbon steel products. Such as figure 1 shown.
Embodiment 2
[0052] The chemical composition (mass content) of ultra-high carbon steel is: C 1.2-1.6%, Si 1.2-1.8%, Mn 0.3-0.8%, Cr 1.2-1.6%, Ni 0.3-0.8%, Mo 0.2-0.5%. The martensitic transformation start temperature (M s ) and transition end temperature (M f ) are about 133.5°C and -9.2°C, respectively.
[0053] After high-temperature diffusion annealing process: heat preservation at 1050°C for 36 hours, and furnace cooling to room temperature, an ultra-fine pearlite structure without network carbides is obtained.
[0054] Quenching-distribution-tempering process: heat preservation at 950°C for 15 minutes, then rapid cooling in water at 25°C, immediately heat preservation in a salt bath at 250°C for 30 minutes, and rapid cooling in water to obtain treated ultra-high carbon steel products.
Embodiment 3
[0056] The chemical composition (mass content) of ultra-high carbon steel is: C 1.2-1.6%, Si 1.2-1.8%, Mn 0.3-0.8%, Cr 1.2-1.6%, Ni 0.3-0.8%, Mo 0.2-0.5%. The martensitic transformation start temperature (M s ) and transition end temperature (M f ) are about 133.5°C and -9.2°C, respectively.
[0057] After high-temperature diffusion annealing process: heat preservation at 1100 ° C for 12 hours, and furnace cooling to room temperature, an ultra-fine pearlite structure without network carbides is obtained.
[0058] Quenching-partitioning-tempering process: heat preservation at 850°C for 30 minutes, then rapid cooling in water at 25°C, immediately heat preservation in a salt bath at 350°C for 20 minutes, and rapid cooling in water to obtain treated ultra-high carbon steel products.
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