Spring steel wire production process used for controlling inclusion substances
A production process, spring steel technology, applied in the field of metallurgy, to achieve the effect of meeting the fatigue life requirements
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Embodiment 1
[0030] A kind of spring steel wire rod production process for controlling inclusion, comprises the steps:
[0031] 1) Adopt the aluminum-free deoxidation process of Si / Mn smelting spring steel 55SiCr, avoid using aluminum in the smelting process, and reduce the Al and Al brought into by slag, lining, alloy, etc. 2 o 3 , to control the W in molten steel [Al] -6 、a [Ca] -9 ;
[0032] 2) Converter top-bottom combined blowing: use special ferrosilicon, control Als<0.0020% in the steel; add light-burned magnesium balls at 0.8kg per ton of steel; control carbon at 0.08wt% at tapping; control the basicity of the final slag at R= 2.5;
[0033] 3) Argon blowing treatment at Ar station: Bottom blowing argon treatment is adopted in the whole process, argon pressure control: 0.4MPa, argon flow rate: 7.0Nm 3 / min, to avoid secondary oxidation and gas absorption;
[0034] 4) Refining by argon blowing in LF ladle: the refining time is 45 minutes, and argon is blown throughout the refin...
Embodiment 2
[0047] A kind of spring steel wire rod production process for controlling inclusion, comprises the steps:
[0048] 1) Adopt the aluminum-free deoxidation process of Si / Mn smelting spring steel 55SiCr, avoid using aluminum in the smelting process, and reduce the Al and Al brought into by slag, lining, alloy, etc. 2 o 3 , to control the W in molten steel [Al] -6 、a [Ca] -9 ;
[0049] 2) Converter top-bottom combined blowing: use special ferrosilicon, control Als<0.0020% in the steel; lightly burnt magnesium balls are added at 1.1kg per ton of steel; tap carbon is controlled at 0.14%; final slag basicity is controlled at R=4.4 ;
[0050] 3) Argon blowing treatment at Ar station: argon pressure control: 0.5MPa, argon flow rate: 8.0Nm 3 / min, to avoid secondary oxidation and gas absorption;
[0051] 4) Refining by argon blowing in LF ladle: the refining time is 45 minutes, and argon is blown throughout the refining process. The argon blowing process follows three different st...
Embodiment 3
[0055] A kind of spring steel wire rod production process for controlling inclusion, comprises the steps:
[0056] 1) Adopt the aluminum-free deoxidation process of Si / Mn smelting spring steel 55SiCr, avoid using aluminum in the smelting process, and reduce the Al and Al brought into by slag, lining, alloy, etc. 2 o 3 , to control the W in molten steel [Al] -6 、a [Ca] -9 ;
[0057] 2) Converter top-bottom combined blowing: use special ferrosilicon, control Als<0.0020% in steel; add light-burned magnesium balls by 1.2kg per ton of steel; control target of tapping carbon 0.08%; control target of final slag basicity R=3.0 ;
[0058] 3) Argon blowing treatment at Ar station: argon pressure control: 0.6MPa, argon flow rate: 9.0Nm 3 / min, to avoid secondary oxidation and gas absorption;
[0059] 4) Refining by argon blowing in LF ladle: the refining time is 30 minutes, and argon is blown throughout the refining process. The argon blowing process follows three different stages ...
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Abstract
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