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Refining slag used for producing sulfur free-cutting steel and circulated using method

A technology of free-cutting steel and refining slag, applied in the field of iron and steel metallurgy, can solve the problems of poor cleanliness of molten steel, unstable control of sulfur content, high processing cost of refining slag, etc., achieve quality improvement, reduce energy consumption, and reduce element burning loss Effect

Active Publication Date: 2017-12-01
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a new refining slag and recycling method for the shortcomings of existing refining methods for sulfur-containing free-cutting steel. The new refining slag and recycling method can simultaneously solve the problems of poor cleanliness of molten steel and sulfur content. Control instability and high cost of refining slag disposal

Method used

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  • Refining slag used for producing sulfur free-cutting steel and circulated using method
  • Refining slag used for producing sulfur free-cutting steel and circulated using method
  • Refining slag used for producing sulfur free-cutting steel and circulated using method

Examples

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Effect test

Embodiment 1

[0044] A kind of sulfur-containing free-cutting steel is 35CrMn5, and its chemical composition is C: 0.35-0.40%, Si: 0.20-0.35%, Mn: 0.85-1.11%, P: 0.02%, S: 0.015-0.030%. , Cr: 1.00-1.30%, Ni: 0.20-0.30%, Al: 0.02-0.05%.

[0045] The smelting process is as follows: 120t converter→120t LF refining→sulfur feeding line→bloom continuous casting.

[0046] The specific smelting method includes the following process steps:

[0047] (1) Deoxidation and alloying of converter tapping. Add alloy, lime and some sulfur-containing high-alkalinity refining slag during the tapping process; the alloys added mainly include alloys with required components such as aluminum, manganese and silicon, and the amount added is determined according to the chemical composition requirements of steel type 35CrMn5; the amount of lime added 2kg / t; the composition of sulfur-containing high-alkalinity refining slag is CaO 55%, SiO 2 5%, Al 2 o 3 28%, MgO 10%, S 2%, the addition amount is 3kg / t; the conv...

specific Embodiment approach 2

[0053] A kind of sulfur-containing free-cutting steel is F45MnVS, and its chemical composition is C: 0.42-0.45%, Si: 0.32-0.40%, Mn: 1.00-1.30%, P: ≤0.035%, S: 0.035-0.045 %, V: 0.06-0.09%, Al: 0.01-0.03%.

[0054] The smelting process is as follows: 80t converter→80t LF refining→80t RH refining→sulfur feeding line→bloom continuous casting.

[0055] The specific smelting method includes the following process steps:

[0056] (1) Deoxidation and alloying of converter tapping. Alloy, lime and part of sulfur-containing high-alkalinity refining slag are added during the tapping process; the alloys added mainly include alloys with required components such as aluminum, manganese and silicon, and the amount added is determined according to the chemical composition requirements of the steel type F45MnVS; the amount of lime added 1kg / t; the composition of sulfur-containing high-alkalinity refining slag is CaO 45%, SiO 2 6%, Al 2 o 3 40%, MgO 6%, S 3%, the addition amount is 5kg / t...

specific Embodiment approach 3

[0061] A kind of sulfur-containing free-cutting steel is 50MnVS, its chemical composition is C: 0.46-0.52%, Mn: 0.60-1.00%, P: ≤0.035%, S: 0.045-0.065%, V: 0.08-0.12 %.

[0062] The smelting process is as follows: 60t converter→60t LF refining→60t VD refining→sulfur feeding line→billet continuous casting.

[0063] The specific smelting method includes the following process steps:

[0064] (1) Deoxidation and alloying of converter tapping. Add alloy, lime and part of sulfur-containing high-alkalinity refining slag during the tapping process; the alloys added mainly include alloys with required components such as aluminum, manganese and silicon, and the amount added is determined according to the chemical composition requirements of steel type 50MnVS; the amount of lime added 3kg / t; the composition of sulfur-containing high-alkalinity refining slag is CaO 50%, SiO 2 10%, Al 2 o 3 31%, MgO 5%, S 4%, the addition amount is 4kg / t; during the tapping process, the converter sl...

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Abstract

The invention relates to refining slag used for producing sulfur free-cutting steel and a circulated using method, and relates to a refining slag system in the ferrous metallurgy industry and a circulated using method thereof. The alkalinity of the refining slag system is high, and the molten steel cleanliness is guaranteed; 2% to 4% of sulfur is contained in the refining slag system, the desulfuration capacity of the refining slag is reduced, and the sulfur content in molten steel can be stably controlled; and the refining slag is used in a circulated manner, and the problem that the treatment cost of the refining slag is high in treatment cost is solved. Operation processes include that converter slagging is strictly controlled in the converter tapping process, and an alloy, lime and part of sulfur-containing high-alkalinity refining slag are added; in the ladle refining process, alloy compositions are adjusted, a deoxygenation agent, the lime and the sulfur-containing high-alkalinity refining slag are added for slagging; after refining is finished, a wire feeder is used for feeding sulfur-containing wires into the molten steel, and then a steel ladle is conveyed to a continuous casting machine for pouring; and finally, the ladle refining slag left after pouring is carried out is recovered, and when sulfur bearing steel is produced, the ladle refining slag is added into the steel ladle for reutilization again in the converter tapping or LF refining process.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to a refining slag for producing sulfur-containing free-cutting steel and a recycling method. Background technique [0002] Free-cutting steel is the addition of elements that can improve the free-cutting performance of the steel to reduce the cutting resistance of the steel, so as to reduce tool wear and improve the cutting performance of the steel. Compared with ordinary carbon steel, free-cutting steel can be processed with higher cutting speed and larger cutting depth, and the surface finish of its processed products is better. It is widely used in machinery industries such as automobiles, agricultural machinery, and general machinery. Sulfur-containing free-cutting steel is the most produced free-cutting steel, accounting for more than 90%. During the steel cutting process, the sulfide inclusions in the sulfur-containing free-cutting steel are conducive to becoming a s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/076C21C7/06C21C7/00C22C38/60C22C38/04C22C38/02C22C38/40C22C38/06C22C38/12
CPCC21C7/0006C21C7/0056C21C7/06C21C7/076C22C38/02C22C38/04C22C38/06C22C38/12C22C38/40C22C38/60Y02P10/20
Inventor 邓志银成刘迟云广杨锋功朱苗勇罗森李想
Owner NORTHEASTERN UNIV LIAONING
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