Wear-resistant low-temperature bainite hot work die steel and preparation method thereof
A technology of low-temperature bainite and hot-work die steel, which is applied in heat treatment equipment, heat treatment furnaces, manufacturing tools, etc., can solve the problems that cannot meet the high toughness, strength and thermal stability requirements of mold materials, and achieve good return Fire stability, reasonable control, simple and easy preparation process
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[0047] The invention also provides a preparation method of wear-resistant low-temperature bainite hot work die steel, comprising the following steps.
[0048] (1) Smelting: According to the design requirements of the composition of the steel, the material is charged, and it is smelted in a vacuum induction furnace and poured into a steel ingot.
[0049] The composition of steel includes: C 0.45~0.50, Si 1.40~1.80, Mn 0.20~0.40, Cr 2.60~3.00, Mo 1.30~1.80, V 0.80~1.00, Ni 0.80~1.20, Zr 0.05~0.10, La 0.005~0.01, Y 0.005~0.008, P<0.01, S<0.005, and the rest are Fe and unavoidable impurities; in addition, the content of alloying elements in weight percentage must also satisfy: 1.66≤R≤2.81, 310 ≤X≤326.
[0050] (2) Hot rolling: the steel ingot is annealed and hot rolled, and after hot rolling, air-cooled to room temperature to obtain a hot rolled slab.
[0051] (3) Post-rolling annealing + solution treatment + spheroidizing annealing: the hot-rolled slab after heat treatment in s...
Embodiment 1
[0055] Example 1, see attached figure 1 , in this example.
[0056] A. According to the mass percentage: C 0.50, Si 1.61, Mn 0.28, Cr 2.72, Mo 1.41, V 0.90, Ni0.92, Zr 0.06, La 0.006, Y 0.004, P 0.0051, S 0.0025, the proportion of Fe balance , calculate the feeding ratio, and pour it into a round ingot with a diameter of Φ80 mm after smelting in a vacuum high-frequency induction furnace + electroslag redissolving.
[0057] B. Hot rolling: heat the ingot to 1150 °C for 5 h for homogenization annealing, and then cool with the furnace. After that, the round ingots were hot rolled at 1150 °C to form a steel plate with a thickness of 25 mm, and air-cooled.
[0058] C. Annealing after rolling + solution treatment + spheroidizing annealing: heat the slab after heat treatment in step B to 880 °C for 1.5 h, cool it to 500 °C with the furnace, and air-cool it. Subsequently, it was reheated to 1100 °C, held for 30 min, and oil quenched. Then, the solid solution slab was heated to 840...
Embodiment 2
[0061] Example 2, see attached figure 2, in this example.
[0062] A. According to the mass percentage: C 0.45, Si 1.73, Mn 0.39, Cr 2.95, Mo 1.75, V 0.96, Ni1.15, Zr 0.09, La 0.009, Y 0.008, P 0.0045, S 0.0032, the proportion of Fe balance , calculate the feeding ratio, and pour it into a round ingot with a diameter of Φ80 mm after smelting in a vacuum high-frequency induction furnace + electroslag redissolving.
[0063] B. Hot rolling: heat the ingot to 1150 °C for 5 h for homogenization annealing, and then cool with the furnace. After that, the round ingots were hot rolled at 1150 °C to form a steel plate with a thickness of 25 mm, and air-cooled.
[0064] C. Annealing after rolling + solution treatment + spheroidizing annealing: heat the slab after heat treatment in step B to 880 °C for 1.5 h, cool it to 500 °C with the furnace, and air-cool it. Then reheat to 1050 °C, hold for 30 min, and oil quench. Then, the solid solution slab was heated to 860 °C for 1 h, cooled ...
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