A kind of preparation method of bearing steel produced by converter process

A bearing steel and converter technology, applied in the manufacture of converters, etc., can solve the problems of steel properties that are difficult to meet strict standards and uneven distribution of non-metallic inclusions, so as to achieve uniform mold slag layer, promote full flotation, and meet lubrication requirements Effect

Active Publication Date: 2020-09-29
JINGYE STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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-metallic inclusions, and the performance of the steel is difficult to meet the strict standard requirements

Method used

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  • A kind of preparation method of bearing steel produced by converter process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A preparation method for bearing steel produced by a converter process, including raw material preparation, converter smelting and alloying, LF+RH refining, continuous casting, rolling, and slow cooling; the chemical composition mass percentage content of the controlled bearing steel is: C 1, Si 0.6, Mn 1.30, Mo 0.02, Ni 0.02, Cr 1.75, V 0.005, Al S 0.01, Hf 0.02, Sb 0.001, Cu 0.15, S≤0.025, P≤0.025, [O]≤8×10 -6 , [H]≤2×10 -6 , Yu is Fe and unavoidable impurity; Concrete production steps are as follows:

[0039] (1) Raw material preparation

[0040] The converter with a capacity of 250t is used as the standard raw material, among which molten iron with P≤0.07%, S≤0.02% accounts for 84-86%, and steel scrap with P≤0.07%, S≤0.02%, Ti≤0.05% accounts for 6-8% %, the rest is iron nuggets with P≤0.07%, S≤0.02%;

[0041] (2) Converter smelting

[0042] Converter smelting is adopted, the end-point phosphorus is ≤0.01%, the end-point carbon is ≥0.35%, and the tapping tempera...

Embodiment 2

[0051] A method for preparing bearing steel produced by a converter process, including raw material preparation, converter smelting and alloying, LF+RH refining, continuous casting, rolling, and slow cooling; the chemical composition mass percentage of the bearing steel is controlled to be: C 1.02, Si 0.62, Mn1.32, Mo 0.04, Ni0.03, Cr 1.78, V 0.006, Al S 0.02, Hf 0.025, Sb 0.003, Cu 0.18, S≤0.025, P≤0.025, [O]≤9×10 -6 , [H]≤2×10 -6 , Yu is Fe and unavoidable impurity; Concrete production steps are as follows:

[0052] (1) Raw material preparation

[0053] The converter with a capacity of 250t is used as the standard raw material, among which molten iron with P≤0.07%, S≤0.02% accounts for 84-86%, and steel scrap with P≤0.07%, S≤0.02%, Ti≤0.05% accounts for 6-8% %, the rest is iron nuggets with P≤0.07%, S≤0.02%;

[0054] (2) Converter smelting

[0055] Converter smelting is adopted, the end-point phosphorus is ≤0.01%, the end-point carbon is ≥0.35%, and the tapping temperat...

Embodiment 3

[0064] A method for preparing bearing steel produced by a converter process, including raw material preparation, converter smelting and alloying, LF+RH refining, continuous casting, rolling, and slow cooling; controlling the chemical composition of the bearing steel in mass percentages: C 1.05, Si 0.65, Mn1.35, Mo 0.05, Ni 0.04, Cr 1.8, V 0.008, Al S 0.03, Hf 0.03, Sb 0.004, Cu 0.2, S≤0.025, P≤0.025, [O]≤8×10 -6 , [H]≤2×10 -6 , Yu is Fe and unavoidable impurity; Concrete production steps are as follows:

[0065] (1) Raw material preparation

[0066] The converter with a capacity of 250t is used as the standard raw material, among which molten iron with P≤0.07%, S≤0.02% accounts for 84-86%, and steel scrap with P≤0.07%, S≤0.02%, Ti≤0.05% accounts for 6-8% %, the rest is iron nuggets with P≤0.07%, S≤0.02%;

[0067] (2) Converter smelting

[0068] Converter smelting is adopted, the end-point phosphorus is ≤0.01%, the end-point carbon is ≥0.35%, and the tapping temperature of...

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Abstract

The invention relates to a preparation method for producing bearing steel through a converter process, wherein the preparation method comprises raw material preparation, converter smelting and alloying, LF and RH refining, continuous casting, rolling, and slow cooling, and the controlled chemical components of the bearing steel comprise, by mass, 1-1.05% of C, 0.6-0.65% of Si, 1.30-1.35% of Mn, 0.02-0.05% of Mo, 0.02-0.04% of Ni, 1.75-1.8% of Cr, 0.005-0.008% of V, 0.01-0.03% of ALS, 0.02-0.03% of Hf, 0.001-0.004% of Sb, 0.15-0.2% of Cu, less than or equal to 0.025% of S, less than or equal to0.025% 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 of Fe and inevitable impurities. According to the present invention, by controlling the smelting raw material, the refining process, the refining slag, the crystallizer protection slag and the continuous casting process, the obtained bearing steel has the low non-metallic inclusion contentand the low Ti content, the square billet cannot produce nozzle nodulation during the continuous casting, the billet drawing is smooth, the billet shell solidification is rapid, the safety of the continuous casting is ensured, and the final product has characteristics of uniform components, stable performance and good strength.

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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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/28C21C7/06C21C7/064C21C7/072C21C7/10C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/60
CPCC21C5/28C21C7/06C21C7/064C21C7/072C21C7/10C22C38/002C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/60
Inventor 张觉灵白华东闫宗根
Owner JINGYE STEEL CO LTD
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