A kind of steel for hub bearing and its manufacturing method
A wheel bearing and molten steel technology, applied in the direction of metal rolling, etc., can solve the problems of low fatigue life, no requirements for metallographic structure, low requirements for non-metallic inclusions, etc., and achieve the effect of high contact fatigue life
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Embodiment 1
[0064] The present embodiment adopts following production process to prepare:
[0065] 1) Hot metal pretreatment:
[0066] Using the KR desulfurization method, the molten iron is stirred in the molten iron ladle to form a vortex, and the desulfurizer is put into the vortex to fully react with the sulfur in the molten iron. Hot metal S≤0.003%;
[0067] 2) Converter smelting:
[0068] It is smelted in a top-bottom combined blown converter with a capacity of more than 100 tons. The primary smelting is carried out with molten iron and high-quality scrap steel as raw materials to achieve pre-removal of P. Lime, synthetic refining slag and various high-purity alloys are added to the steel for pre-deoxidation and initial composition. Adjustment, use sliding plate for composite slag blocking to ensure no slag tapping and prevent back to P;
[0069] 3) Refining:
[0070] Deep deoxidation and alloying of molten steel are carried out in an LF furnace of more than 100 tons, and refini...
Embodiment 2
[0082] The present embodiment adopts following production process to prepare:
[0083] 1) Hot metal pretreatment:
[0084] Using the KR desulfurization method, the molten iron is stirred in the molten iron ladle to form a vortex, and the desulfurizer is put into the vortex to fully react with the sulfur in the molten iron. Hot metal S≤0.003%;
[0085] 2) Converter smelting:
[0086] It is smelted in a top-bottom combined blown converter with a capacity of more than 100 tons. The primary smelting is carried out with molten iron and high-quality scrap steel as raw materials to achieve pre-removal of P. Lime, synthetic refining slag and various high-purity alloys are added to the steel for pre-deoxidation and initial composition. Adjustment, use sliding plate for composite slag blocking to ensure no slag tapping and prevent back to P;
[0087] 3) Refining:
[0088] Deep deoxidation and alloying of molten steel are carried out in an LF furnace with a capacity of more than 100 ...
Embodiment 3
[0100] The present embodiment adopts following production process to prepare:
[0101] 1) Hot metal pretreatment:
[0102] Using the KR desulfurization method, the molten iron is stirred in the molten iron ladle to form a vortex, and the desulfurizer is put into the vortex to fully react with the sulfur in the molten iron. Hot metal S≤0.003%;
[0103] 2) Converter smelting:
[0104] It is smelted in a top-bottom combined blown converter with a capacity of more than 100 tons. The primary smelting is carried out with molten iron and high-quality scrap steel as raw materials to achieve pre-removal of P. Lime, synthetic refining slag and various high-purity alloys are added to the steel for pre-deoxidation and initial composition. Adjustment, use sliding plate for composite slag blocking to ensure no slag tapping and prevent back to P;
[0105] 3) Refining:
[0106] Deep deoxidation and alloying of molten steel are carried out in an LF furnace of more than 100 tons, and refini...
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