High-heat-resistance and high-toughness hot work die steel and manufacturing process thereof
A technology of hot work die steel and manufacturing process, which is applied in the field of die steel, can solve problems such as cracking failure, high-temperature strength and hardness reduction of materials, and achieve the effects of improving structure, improving thermal strength and toughness, and improving thermal stability
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Embodiment 1-6
[0037] The following is illustrated by taking Example 1 as an example. The manufacturing process of high thermal strength and high toughness hot work die steel includes the following steps:
[0038] Material smelting: Put the raw materials into the furnace body for smelting and refining at 1600°C, then carry out vacuum degassing, and then pour into steel ingots;
[0039] Diffusion annealing: keep the steel ingot at a high temperature of 1100°C for 9 hours;
[0040] Forging: Multi-directional forging is performed on the steel ingot after diffusion annealing to obtain a forging billet;
[0041] Post-forging heat treatment: the forging billet is first fog-cooled, then air-cooled until the temperature drops below 200°C, and then the air-cooled forging billet is kept at 950°C for 8 hours, and then air-cooled to below 200°C to obtain a heat-treated forging billet;
[0042] Dehydrogenation annealing: the heat-treated forging billet is kept at 600°C for 25 hours, and then cooled to b...
Embodiment 7-10
[0048] As shown in Table 2, the main difference between Examples 7-9 and Example 6 lies in the weight ratio of titanium and vanadium in the steel, and the main difference between Example 10 and Example 6 lies in the weight ratio of yttrium and niobium in the steel. The manufacturing process of the high thermal strength and high toughness hot work die steel of Examples 7-10 is the same as that of Example 1.
[0049] Example 7 Example 8 Example 9 Example 10 carbon 0.035 0.035 0.035 0.035 silicon 0.08 0.08 0.08 0.08 manganese 0.25 0.25 0.25 0.25 chromium 2.50 2.50 2.50 2.50 molybdenum 1.00 1.00 1.00 1.00 vanadium 0.40 0.30 0.50 0.40 cobalt 0.80 0.80 0.80 0.80 titanium 0.10 0.10 0.10 0.10 yttrium 0.06 0.06 0.06 0.03 niobium 0.06 0.06 0.06 0.06 phosphorus 0.005 0.005 0.005 0.005 sulfur 0.003 0.003 0.003 0.003 iron 94.707 94.807 94.607 94.737 tota...
Embodiment 11
[0051] The difference between Example 11 and Example 7 is that the temperature in the diffusion annealing step is 1200° C., and the holding time is 15 hours. The post-forging heat treatment is as follows: the forging billet is first fog-cooled, then air-cooled until the temperature drops below 200°C, and then the air-cooled forging billet is kept at 1150°C for 10 hours, and then air-cooled to below 200°C to obtain a heat-treated forging billet . Dehydrogenation annealing is: heat-treated forging billet is kept at 700°C for 30 hours, and then cooled to below 250°C to obtain dehydrogenation annealing billet. The tempering heat treatment is as follows: the dehydrogenation annealed forging billet is kept at 600°C for 20 hours, then the forging billet is cooled to 200°C, and then air-cooled to obtain hot work die steel.
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