Casting method of free-cutting ferritic stainless steel
A ferrite and stainless steel technology, applied in the field of iron and steel smelting, can solve the problems of deterioration of steel toughness, inability to process, influence of hot working, etc., to reduce the cooling rate, avoid the problem of cracking, and enhance the feeding ability.
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Embodiment 1
[0053] In addition to iron and inevitable impurity elements, the chemical composition (mass percentage) of the molten steel to be poured is as follows:
[0054] C+N Si Mn P S Cr Mo Bi 0.022 0.42 1.20 0.031 0.30 20.05 1.86 0.15
[0055] (1) Control the tapping temperature of the molten steel to be poured within the range of liquidus temperature + 120°C.
[0056] (2) The mold casting ingot type adopts 5.8 tons of square ingot, the temperature of the ingot mold should be kept above 80 ℃ before pouring, and the molten steel flow rate should be controlled at 2.1 tons / min.
[0057] (3) The pouring process is protected by argon gas seal, and the argon gas flow rate is not less than 7.5m 3 / min, casting mold powder adopts low-carbon mold powder with a carbon content not exceeding 1.5%.
[0058] (4) After pouring, the vehicle is moved after 5 hours of standing time.
[0059] After testing, the surface of the steel ingot is good without cracks, and ...
Embodiment 2
[0062] In addition to iron and inevitable impurity elements, the chemical composition (mass percentage) of the molten steel to be poured is as follows:
[0063] C Si Mn P S Cr Mo Bi 0.035 0.69 1.01 0.031 0.19 18.2 1.2 0.05
[0064] (1) Control the tapping temperature of the molten steel to be poured within the range of liquidus temperature + 100 °C.
[0065] (2) The mold casting ingot type adopts 5.8 tons of square ingot, the temperature of the ingot mold should be kept above 80 ℃ before pouring, and the molten steel flow rate should be controlled at 2.5 tons / min.
[0066] (3) The pouring process is protected by argon gas seal, and the argon gas flow rate is not less than 6m 3 / min, casting mold powder adopts low-carbon mold powder with a carbon content not exceeding 1.8%.
[0067] (4) After pouring, the vehicle is moved after 5 hours of standing time.
[0068] After testing, the surface of the steel ingot is good without cracks, and the t...
Embodiment 3
[0072] In addition to iron and inevitable impurity elements, the chemical composition (mass percentage) of the molten steel to be poured is as follows:
[0073] C+N Si Mn P S Cr Mo Bi 0.015 0.39 1.28 0.038 0.35 24.5 3.1 0.3
[0074] (1) Control the tapping temperature of the molten steel to be poured within the range of liquidus temperature + 85°C.
[0075] (2) The mold casting ingot type adopts 5.8 tons of square ingot, the temperature of the ingot mold should be kept above 100 ℃ before pouring, and the molten steel flow rate should be controlled at 1.6 tons / min.
[0076] (3) The pouring process is protected by argon gas seal, and the argon gas flow rate is not less than 9m 3 / min, casting mold powder adopts low-carbon mold powder with a carbon content not exceeding 1.1%.
[0077] (4) After pouring, the vehicle is moved after the standing time is 4 hours.
[0078] After testing, the surface of the steel ingot is good, without cracks, and ...
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