Manufacturing method of low-oxygen low-inclusion bearing steel

A technology for bearing steel and impurities, applied in the direction of manufacturing converters, etc., can solve the problems of uneven distribution of non-metallic inclusions, and the difficulty of steel performance to meet strict standard requirements.

Inactive Publication Date: 2018-08-03
温州市赢创新材料技术有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

However, the bearing steel prepared by this method still has the problem of uneven distribution of non-me

Method used

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  • Manufacturing method of low-oxygen low-inclusion bearing steel

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Effect test

Embodiment 1

[0055]A method for preparing low-oxygen and low-inclusion bearing steel, including raw material preparation, converter smelting and alloying, LF+VD refining, continuous casting, rolling, slow cooling; controlling the chemical composition mass percentage of the bearing steel to be C 1.06, Si 0.7, Mn 1.30, Mo0.02, Ni 0.06, Cr 1.85, Co 0.02, V 0.02, Al S 0.01, Hf 0.02, Ta 0.01, Te 0.005, Cu0.05, S≤0.025, P≤0.025, [O]≤10×10 -6 , [H]≤2×10 -6 , the remainder being Fe and unavoidable impurities; The specific production steps are as follows:

[0056] (1) Raw material preparation

[0057] The converter with a capacity of 300t is used as the standard raw material, among which molten iron with P≤0.07%, S≤0.02% accounts for 87~88%, and scrap steel with P≤0.07%, S≤0.02%, Ti≤0.05% accounts for 8-10% %, the rest is iron lumps with P≤0.07%, S≤0.02%;

[0058] (2) Converter smelting

[0059] Converter smelting is used, the end point phosphorus is ≤0.01%, the end point carbon is ≥0.25%, th...

Embodiment 2

[0071] A method for preparing low-oxygen and low-inclusion bearing steel, including raw material preparation, converter smelting and alloying, LF+VD refining, continuous casting, rolling, and slow cooling; the chemical composition mass percentage content of the controlled bearing steel is C 1.08, Si 0.72, Mn 1.32, Mo0.04, Ni 0.07, Cr 1.88, Co 0.03, V 0.025, Al S 0.02, Hf 0.025, Ta 0.018, Te 0.006, Cu0.8, S≤0.025, P≤0.025, [O]≤10×10 -6 , [H]≤2×10 -6 , the remainder being Fe and unavoidable impurities; The specific production steps are as follows:

[0072] (1) Raw material preparation

[0073] The converter with a capacity of 300t is used as the standard raw material, among which molten iron with P≤0.07%, S≤0.02% accounts for 87~88%, and scrap steel with P≤0.07%, S≤0.02%, Ti≤0.05% accounts for 8-10% %, the rest is iron lumps with P≤0.07%, S≤0.02%;

[0074] (2) Converter smelting

[0075] Converter smelting is used, the end point phosphorus is ≤0.01%, the end point carbon i...

Embodiment 3

[0087] A method for preparing low-oxygen and low-inclusion bearing steel, including raw material preparation, converter smelting and alloying, LF+VD refining, continuous casting, rolling, slow cooling; controlling the chemical composition mass percentage of bearing steel to be C 1.1, Si0 .75, Mn 1.35, Mo0.05, Ni 0.08, Cr 1.9, Co 0.04, V 0.03, Al S 0.03, Hf 0.03, Ta 0.02, Te 0.008, Cu 0.1, S≤0.025, P≤0.025, [O]≤10×10 -6 , [H]≤2×10 -6 , the remainder being Fe and unavoidable impurities; The specific production steps are as follows:

[0088] (1) Raw material preparation

[0089] The converter with a capacity of 300t is used as the standard raw material, among which molten iron with P≤0.07%, S≤0.02% accounts for 87~88%, and scrap steel with P≤0.07%, S≤0.02%, Ti≤0.05% accounts for 8-10% %, the rest is iron lumps with P≤0.07%, S≤0.02%;

[0090] (2) Converter smelting

[0091] Converter smelting is used, the end point phosphorus is ≤0.01%, the end point carbon is ≥0.25%, the temp...

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Abstract

The invention discloses a manufacturing method of low-oxygen low-inclusion bearing steel. The manufacturing method comprises the steps of preparing of raw materials, converter smelting and alloying, LF+VD refining, continuous casting, rolling and slow cooling, wherein the mass percent of chemical components of the bearing steel in content is controlled to reach the standards of 1.06-1.1% of C, 0.7-0.75% of Si, 1.30-1.35% of Mn, 0.02-0.05% of Mo, 0.06-0.08% of Ni, 1.85-1.9% of Cr, 0.02-0.04% of Co, 0.02-0.03% of V, 0.01-0.03% of Als, 0.02-0.03% of Hf, 0.01-0.02% of Ta, 0.005-0.008% of Te, 0.05-0.1% of Cu, less than or equal to 0.025% of S, less than or equal to 0.025 of P, less than or equal to 10*10<-6> of O, less than or equal to 2*10<-6> of H and the balance Fe and inevitable impurities.According to the manufacturing method of the low-oxygen low-inclusion bearing steel smelting, the raw materials, the refining process, refining slag, crystallizer casting powder and the continuous casting process are controlled, so that the content of the obtained non-metal impurities of the bearing steel is low, and the content of the Ti is low; the phenomenon of nozzle nodulation is avoided inthe continuous casting process of square billets, blank throwing is smooth, the solidification speed of a blank shell is high, and safety of continuous casting is ensured, so that a final product is uniform in component, stable in performance and good in strength; and after heat treatment, the yield strength reaches 700 MPa, the tensile strength reaches 910 MPa, and the elongation at the cross section reaches 35%.

Description

technical field [0001] The invention relates to a method for producing bearing steel, in particular to a method for producing high-carbon chromium bearing steel using a converter and a continuous casting machine. Background technique [0002] High-carbon chromium bearing steel is mainly used for steel balls, rollers and rings on bearings of automobiles, motorcycles, household appliances, tractors, railway vehicles, metallurgical and mining machinery, and high-speed rotating, high-load mechanical bearings. Before the present invention, the domestic traditional bearing steel production process is: electric furnace smelting→LF furnace refining→vacuum refining→die casting or continuous casting→rolling→slow cooling hood slow cooling (air cooling). The production of high-carbon chromium bearing steel by electric furnace and vacuum treatment has many procedures, long cycle, difficult smelting organization and high production cost. [0003] High-carbon chromium bearing steel is the...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/52C22C38/46C22C38/06C22C38/48C22C38/60C22C38/42C22C33/04C21D8/00C21D1/26C21D1/18B22D11/111C21C5/36C21C7/06C21C7/10
CPCB22D11/111C21C5/36C21C7/06C21C7/10C21D1/18C21D1/26C21D8/005C22C33/04C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/52C22C38/60
Inventor 周建武
Owner 温州市赢创新材料技术有限公司
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