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Process of deoxygenating, desulfurizing and controlling non-metal inclusion content in steel

A technology for desulfurization of non-metallic inclusions and molten iron, used in desulfurization, high-strength alloy structural steel, deoxidation, control of non-metallic inclusions in steel, and the production of steel grades, it can solve the problem of high oxygen content in steel and reduce total oxygen content, high desulfurization ability, and the effect of preventing secondary oxidation

Inactive Publication Date: 2007-08-22
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

Another technical route is to use lower basicity slag refining (Al in slag 2 o 3 The mass fraction is lower than 38%), basically no Al 2 o 3 Inclusions and Type D inclusions, but the steel has a higher oxygen content

Method used

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  • Process of deoxygenating, desulfurizing and controlling non-metal inclusion content in steel

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Embodiment Construction

[0013] Test steel 42CrMo (chemical composition weight percentage (%): C: 0.38 ~ 0.45, Si: 0.17 ~ 0.37, Mn: 0.50 ~ 0.80, Mo: 0.15 ~ 0.25, Cr: 0.90 ~ 1.20, P < 0.035, S < 0.035 ).

[0014] (1) Pour 143 tons of molten iron into the converter, molten iron [S] = 0.014%, [P] = 0.08%, [C] = 3.75%, T = 1345 ° C, add active lime 7862Kg, high Mg lime 3654Kg to start blowing Refining, converter blowing time is 29min, end point of blowing [C]=0.12%, [P]=0.008%, [S]=0.008%, T=1696℃, final slag basicity 5. Converter tapping strictly prevents slag, and uses a large tank with a clean bottom to hold molten steel. Add 80Kg of aluminum shot at the beginning of tapping, and then add 80Kg of aluminum shot when tapping 1 / 3, and add 170Kg of carbon powder and 55Kg of low-aluminum ferrosilicon. , 875Kg silicon manganese, 1950Kg ferrochromium, 300Kg ferromolybdenum, 90Kg aluminum shot is added when tapping 2 / 3, the tapping time is 5min, the slag thickness at the end of tapping is 60mm, and the cleara...

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Abstract

The present invention is process of deoxygenating, desulfurizing and controlling non-metal inclusion content in steel, and belongs to the field of steel making production technology. The process includes desulfurizing molten iron to S content of 0.003-0.006 wt%; smelting in a converter to reach CaO / SiO2 alkalinity of 4-7 and P content of 0.003-0.01 wt%, and tapping while blocking slag strictly and adding Al in 0.09-0.2 wt%; adding high alkalinity slag 0.4-1 wt% and Al 0.04-0.12 wt% into molten steel in a LF furnace while blowing Ar and stirring; adding Al to reach acid soluble Al content in molten steel of 0.030-0.070 wt%; vacuum treatment at 30-300 Pa for 15-30 min; and protected continuous casting. The present invention is suitable for producing high strength structural alloy steel, high strength carbon steel, low alloy steel and other special steel.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular provides a method for deoxidizing, desulfurizing, and controlling non-metallic inclusions in steel, which is mainly used for high-strength alloy structural steel, and is also applicable to various high-strength carbon steels and low-alloy steels , special steel and other steel production. Background technique [0002] High-strength alloy structural steel is mainly used for shafts, gears, connecting rods, springs, bolts, etc., and is subjected to cyclic alternating stress during service, requiring good fatigue resistance. Fatigue failure of steel is one of the main ways of component failure. Statistical results show that fatigue damage accounts for more than 90% of the failure of mechanical parts. In order to improve the fatigue life of steel, it is necessary to greatly reduce the content of oxygen and sulfur in steel, and to control the size, shape, type and distribution o...

Claims

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Application Information

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IPC IPC(8): C21C7/00C21C7/06C21C7/04C21C7/10
Inventor 王新华陈斌姜敏包萨日娜王万军李宏张炯明于会香王灿国
Owner UNIV OF SCI & TECH BEIJING
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