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A method for deep desulfurization in the smelting process of bearing steel

A smelting process and deep desulfurization technology, applied in the field of metallurgy, can solve problems such as restricting production organization and the smooth running of upper and lower processes, increasing smelting costs, etc., to achieve good economic and social benefits, and stable production.

Active Publication Date: 2021-02-12
XINGTAI IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This mode of operation not only increases the cost of smelting, but also seriously restricts the production organization and the smooth flow of the upper and lower processes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The method for deep desulfurization in the bearing steel smelting process of this embodiment includes the following steps:

[0024] (1) Pre-desulfurization of molten iron: S of molten iron after pre-desulfurization treatment: 0.015%;

[0025] (2) Converter smelting: the tapping temperature of the converter is 1660°C, and the oxygen content of the tapping is 350ppm; when tapping the converter, add carburizer 7.5kg / t steel, aluminum block, lime 2.7kg / t steel, and synthetic slag 9.0kg / t The amount of steel, alloy, and aluminum blocks added is controlled according to the Al content of the LF furnace at 0.038%, and the alloy is added to adjust the chemical composition to the target content, and the initial binary basicity of the slag is controlled at 4.0. The slag components are: CaO: 47%, SiO 2 : 10%, Al 2 o 3 : 30%, MgO: 6%; converter end point S: 0.012%;

[0026] Carburizer C: 98%; the main components of synthetic slag are: CaO: 48%, Al 2 o 3 : 38%, SiO 2 : 12%, MgO...

Embodiment 2

[0032] The method for deep desulfurization in the bearing steel smelting process of this embodiment includes the following steps:

[0033] (1) Pre-desulfurization of molten iron: S: 0.013% of molten iron after pre-desulfurization of molten iron;

[0034] (2) Converter smelting: the tapping temperature of the converter is 1650°C, and the oxygen content of the tapping is 330ppm; when tapping the converter, add carburizer 7.7kg / t steel, aluminum block, lime 3.1kg / t steel, and synthetic slag 9.5kg / t The amount of steel, alloy, and aluminum blocks added is controlled according to the Al content of the LF furnace at 0.040%, and the alloy is added to adjust the chemical composition to the target content, and the initial binary basicity of the slag is controlled at 3.8. The slag components are: CaO: 48%, SiO 2 : 11.5%, Al 2 o 3 : 31%, MgO: 7%; converter end point S: 0.010%;

[0035] Carburizer C: 96%; the main components of synthetic slag are: CaO: 46%, Al 2 o 3 : 35%, SiO 2 : 1...

Embodiment 3

[0041] The method for deep desulfurization in the bearing steel smelting process of this embodiment includes the following steps:

[0042] (1) Pre-desulfurization of molten iron: S of molten iron after pre-desulfurization treatment: 0.012%;

[0043] (2) Converter smelting: the tapping temperature of the converter is 1655°C, and the oxygen content of the tapping is 370ppm; when tapping the converter, add carburant 7.6kg / t steel, aluminum block, lime 2.9kg / t steel, and synthetic slag 9.7kg / t in sequence The amount of steel, alloy, and aluminum blocks added is controlled according to the Al content of the LF furnace at 0.032%, and the alloy is added to adjust the chemical composition to the target content, and the initial binary alkalinity of the slag is controlled at 4.2. The slag components are: CaO: 46%, SiO 2 : 12%, Al 2 o 3 : 29%, MgO: 6.5%; converter end point S: 0.010%;

[0044] Carburizer C: 96.5%; the main components of synthetic slag are: CaO: 49%, Al 2 o 3 : 37%, ...

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Abstract

The invention discloses a method for deep desulfurization in the smelting process of bearing steel. The method includes: (1) pre-desulfurization of molten iron: S≤0.015% of molten iron after pre-desulfurization; Oxygen content ≤ 400ppm, converter end point molten steel S ≤ 0.015%; (3) LF furnace refining: molten steel S ≤ 0.0020% after refining; (4) RH furnace refining: molten steel entering RH furnace S ≤ 0.0020%, RH vacuum holding time ≥ After 30 minutes, the RH furnace is hoisted to the continuous casting machine for casting after refining. The invention effectively avoids the problems of high-alkalinity slag flocculation and poor desulfurization effect of low-alkalinity slag without increasing the refining treatment time of molten steel outside the furnace and relaxing the sulfur content of molten iron, scrap steel, slag, etc., and makes the bearing steel The sulfur content of the finished product is stable below 0.0015%, realizing the stable production of deep desulfurization of bearing steel, and achieving good economic and social benefits.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for deep desulfurization in the smelting process of bearing steel. Background technique [0002] Bearing steel is mainly used to manufacture balls, rollers and bearing rings, etc. It is used in the mechanical rotating parts of various equipment, carrying various shear forces and heavy loads, and has a great impact on chemical composition, non-metallic inclusion content and distribution, and carbides. The requirements are very strict. As one of the chemical components, sulfur element not only causes hot embrittlement of steel, but also increases surface cracks and decreases toughness, and has a great influence on hydrogen-induced cracking (HIC) and sulfide stress corrosion cracking (SCC). The requirements for sulfur content are becoming increasingly stringent, and some agreement numbers require sulfur to be below 0.0015%, or even below 0.0005%. [0003] I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064C21C7/10C21C5/28
CPCC21C5/28C21C7/064C21C7/10Y02P10/20
Inventor 冯文甫修建军郭志彬李刚李富伟赵彦岭霍志斌范建英阎丽珍逯志方曹红波赵世杰郭键韩清连马富平叶凡新王百顺
Owner XINGTAI IRON & STEEL