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A refining slag for producing sulfur-containing free-cutting steel and its recycling method

A technology for 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 sulfur content control, and high processing cost of refining slag, improving quality, reducing energy consumption, and reducing element burning loss Effect

Active Publication Date: 2019-05-24
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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  • A refining slag for producing sulfur-containing free-cutting steel and its recycling method
  • A refining slag for producing sulfur-containing free-cutting steel and its recycling method
  • A refining slag for producing sulfur-containing free-cutting steel and its recycling method

Examples

Experimental program
Comparison scheme
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

A refining slag used for producing sulfur-containing free-cutting steel and a recycling method. The invention relates to a refining slag system in the iron and steel metallurgical industry and a recycling method thereof. The refining slag system has high alkalinity, ensuring the cleanliness of molten steel; the refining slag system contains 2 to 4% sulfur, which reduces the sulfur content of the refining slag. The desulfurization capability can stably control the sulfur content in the molten steel; the recycling of refining slag can solve the problem of high refining slag treatment costs. The operation process of the invention is as follows: during the converter tapping process, the converter slag is strictly controlled, and alloy, lime and part of the sulfur-containing high-alkalinity refining slag are added. Then the alloy composition is adjusted during the ladle refining process, and deoxidizer, lime and high-alkalinity sulfur-containing refining slag are added for slagging. After refining, a wire feeder is used to feed sulfur-containing wire into the molten steel; then the ladle is transported to the continuous casting machine for pouring. Finally, the ladle refining slag after pouring is recycled. When producing sulfur-containing steel, it is added to the ladle for reuse during converter tapping or LF refining.

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 Patents(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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