A kind of production method of low-cost high hardenability medium carbon chromium steel
A technology with high hardenability and production method, applied in the direction of manufacturing converters, etc., can solve problems such as lack, achieve low P and low S control, improve density and composition segregation, and improve the effect of low temperature ductile-brittle transition temperature
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Embodiment 1
[0035] A method for producing medium carbon chromium steel with low cost and high hardenability, comprising the steps of:
[0036] Primary smelting of basic converter with top-bottom combined blowing: 72t of high-quality molten iron is used as the main raw material, and 5t of pig iron is used as the main raw material for steelmaking. The hot charging ratio of molten iron reaches 80%. During the blowing process, lime, dolomite, Adding amount of ore, etc., using the "double slag" method for dephosphorization, controlling the C content wt to 0.08% in tapping, and the P content wt in tapping to 0.010%, blocking the slag and tapping; adding SiCaBaAl 1.0kg / t when tapping 15t, steel Core aluminum 2.0kg / t strong deoxidation, ferroalloy material (ferroalloy material includes ferrosilicon manganese, ferrochrome, nickel plate and ferromolybdenum), recarburizer, slag material (slag material adopts 300kg / furnace lime, 500kg / furnace pre-melting The mixture of refining slag and 100kg / furnace...
Embodiment 2
[0045] A method for producing medium carbon chromium steel with low cost and high hardenability, comprising the steps of:
[0046] Primary smelting of basic converter with top-bottom combined blowing: 72t of high-quality molten iron is used as the main raw material, and 5t of pig iron is used as the main raw material for steelmaking. The hot charging ratio of molten iron reaches 80%. During the blowing process, lime, dolomite, The amount of ore and other additions is dephosphorized by the "double slag" method. The content of C in tapping is controlled to 0.10% wt, the content of P in tapping is wt0.009%, and the slag is blocked to tapping; when tapping 15t, add SiCaBaAl1.0kg / t, steel Core aluminum 2.0kg / t strong deoxidation, ferroalloy material (ferroalloy material includes ferrosilicon manganese, ferrochrome, nickel plate and ferromolybdenum), recarburizer, slag material (slag material adopts 300kg / furnace lime, 500kg / furnace pre-melting The mixture of refining slag and 100kg...
Embodiment 3
[0055] A method for producing medium carbon chromium steel with low cost and high hardenability, comprising the steps of:
[0056] Primary smelting of basic converter with top-bottom combined blowing: 72t of high-quality molten iron is used as the main raw material, and 5t of pig iron is used as the main raw material for steelmaking. The hot charging ratio of molten iron reaches 80%. During the blowing process, lime, dolomite, The amount of ore and other additions is dephosphorized by the "double slag" method. The C content wt in tapping is 0.12%, the P content wt in tapping is 0.008%, and the slag is blocked for tapping; when tapping 18t, add SiCaBaAl 1.0kg / t, steel Core aluminum 2.0kg / t strong deoxidation, ferroalloy material (ferroalloy material includes ferrosilicon manganese, ferrochrome, nickel plate and ferromolybdenum), recarburizer, slag material (slag material adopts 300kg / furnace lime, 500kg / furnace pre-melting The mixture of refining slag and 100kg / furnace fluorite...
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