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Preparation method of rolling mill bearing steel

A technology for bearing steel and rolling mill, applied in the field of preparing bearing steel for rolling mills, can solve the problems of high-strength and toughness bearing steel, easily polluted bearings, harsh working environment, etc.

Inactive Publication Date: 2014-05-14
锡山区鹅湖慧盾机械厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(2) The working environment is harsh. When the rolling mill is rolling, the rolls must be cooled with water, and there is splashing of iron oxide scales, and the bearings are easily polluted
[0005] The above-mentioned patents involve technologies for improving rolling fatigue performance and specific applicable performance, but do not involve solving the problem of manufacturing high-strength and toughness bearing steel suitable for heavy loads and high impact conditions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for preparing steel for rolling mill bearings. The chemical composition of the steel consists of the following components in weight percentage: C: 1.05, Si: 0.5, Mn: 1.3, Mo: 1.3, V: 0.2, Cr: 1.4, Ni : 0.4, Cu: 0.4, S≤0.015, P≤0.015, Ti: 0.02, [O]≤15×10 -4 , [H]≤2×10 -4 , the remainder being Fe and unavoidable impurities; the preparation method comprises the following steps:

[0020] (1) Smelting and alloying, electric furnace smelting, tapping, refining outside the furnace, and vacuum degassing;

[0021] (2) Casting, using die casting or continuous casting, control the superheat of the continuous casting tundish to 40°C, and control the casting speed of continuous casting to 1.3m / min to ensure the quality of the cast slab;

[0022] (3) Rolling, the soaking temperature of the billet in the heating furnace is 1180°C, the heating time is 3.5 hours, the starting rolling temperature is 1110°C, and the finishing rolling temperature is 840°C;

[0023] (4) Cooling ...

Embodiment 2

[0026] A method for preparing steel for rolling mill bearings. The chemical composition of the steel consists of the following components in weight percentage: C: 1.15, Si: 0.3, Mn: 1.5, Mo: 1.1, V: 0.4, Cr: 1.2, Ni : 0.6, Cu: 0.2, S≤0.015, P≤0.015, Ti: 0.02-0.04, [O]≤15×10 -4 , [H]≤2×10 -4 , the remainder being Fe and unavoidable impurities; the preparation method comprises the following steps:

[0027] (1) Smelting and alloying, electric furnace smelting, tapping, refining outside the furnace, and vacuum degassing;

[0028] (2) Casting, using die casting or continuous casting, control the superheat of the continuous casting tundish to 50°C, and control the casting speed of continuous casting to 1.1m / min to ensure the quality of the cast slab;

[0029] (3) Rolling, the soaking temperature of the billet in the heating furnace is 1200°C, the heating time is 2.5 hours, the starting rolling temperature is 1130°C, and the finishing rolling temperature is 820°C;

[0030] (4) Con...

Embodiment 3

[0033] A method for preparing steel for rolling mill bearings. The chemical composition of the steel consists of the following components in weight percentage: C: 1.1, Si: 0.4, Mn: 1.4, Mo: 1.2, V: 0.3, Cr: 1.3, Ni : 0.5, Cu: 0.3, S≤0.015, P≤0.015, Ti: 0.03, [O]≤15×10 -4 , [H]≤2×10 -4 , the remainder being Fe and unavoidable impurities; the preparation method comprises the following steps:

[0034] (1) Smelting and alloying, electric furnace smelting, tapping, refining outside the furnace, and vacuum degassing;

[0035] (2) Casting, using die casting or continuous casting, control the superheat of the continuous casting tundish to 45°C, and control the casting speed of continuous casting to 1.2m / min to ensure the quality of the cast slab;

[0036] (3) rolling, the soaking temperature of the billet in the heating furnace is 1190°C, the heating time is 3 hours, the starting rolling temperature is 1120°C, and the finishing rolling temperature is 830°C;

[0037] (4) Cooling con...

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Abstract

The invention discloses a preparation method of rolling mill bearing steel. The preparation method comprises the following steps: (1) smelting and alloying: performing electric furnace smelting and tapping, and adopting external refining and vacuum degassing treatment; (2) pouring: adopting die casting or continuous casting, controlling the superheat degree of the continuous casting tundish at 40-50 DEG C, and controlling the casting speed of the continuous casting at 1.1-1.3m / min to guarantee the quality of the casting billet; (3) rolling, wherein the soaking temperature of the billet in a heating furnace is 1,180-1,200 DEG C, the heating time is 2.5-3.5 hours, the initial rolling temperature is 1,110-1,130 DEG C, and the final rolling temperature is 820-840 DEG C; (4) cooling control, wherein the cooling speed of the rolled steel is 3-5 DEG C / min; (5) heat treatment: heating the billet to 960-980 DEG C, preserving heat for 1-2 hours and performing oil quenching, and then tempering, wherein the heating temperature in tempering is 180-190 DEG C, and the temperature is kept for 2-4 hours.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for preparing steel for rolling mill bearings. Background technique [0002] At present, the rolling mill is developing towards high speed, heavy load, high strength, high rigidity, high precision, continuous rolling and automation. The rolling mill bearing is a key part of the rolling mill, which is directly related to the production efficiency, product quality and production cost of the rolling mill. Compared with general-purpose bearings, rolling mill bearings have the following characteristics: (1) The working load is large. Generally speaking, the rolled piece is rolled when it is bitten, that is, the load is suddenly established, so the impact load is Bearing load characteristics. Generally, the unit pressure of rolling mill bearings is 2-4 times higher than that of general-purpose bearings, and the pv value (the product of bearing unit pressure ...

Claims

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Application Information

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IPC IPC(8): C22C38/50C22C33/04C21D8/00
Inventor 诸金平
Owner 锡山区鹅湖慧盾机械厂
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