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Smelting method for modifying sulfide inclusions in non-quenched and tempered steel or pinion steel

A technology of non-quenched and tempered steel and smelting method, applied in the field of iron and steel metallurgy, can solve the problem that the improvement of the free cutting performance and fatigue resistance of non-quenched and tempered steel and gear steel is not ideal, the effect of calcium modification process is not ideal, and the sulfide Problems such as low ellipsoid rate

Active Publication Date: 2018-03-06
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, non-quenched and tempered steel and gear steel are generally used to feed silicon-calcium wire or pure calcium wire. The effect of calcium modification process is not ideal, and the sulphide ellipsoid rate is low. The performance improvement is not ideal

Method used

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  • Smelting method for modifying sulfide inclusions in non-quenched and tempered steel or pinion steel
  • Smelting method for modifying sulfide inclusions in non-quenched and tempered steel or pinion steel

Examples

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Effect test

Embodiment 1

[0036] In this embodiment, a smelting method for sulfide inclusion modification in gear steel includes the following steps for sulfide inclusion modification treatment in 20MnCr5 gear steel:

[0037] a. The molten iron is initially smelted in an electric furnace, then LF refined and vacuum treated, so that the C, Si, Mn, P and Cr alloy elements in the molten steel meet the composition requirements of 20MnCr gear steel, and the molten steel is obtained for preliminary refining treatment;

[0038] b. control the mass percentage content of sulfur in the molten steel prepared in said step a to be no higher than 0.005%, the oxygen content to be no higher than 6ppm, and the mass percentage content of aluminum to be no higher than 0.012%, and to control the molten steel temperature At 1566 ~ 1596 ℃, then start to feed the cored wire into the molten steel to refine and modify the molten steel; during the refining and modifying process, feed silicon magnesium calcium (Mg: 20% , Ca: 15%...

Embodiment 2

[0043] This embodiment is basically the same as Embodiment 1, especially in that:

[0044] In this embodiment, a smelting method for modifying sulfide inclusions in non-quenched and tempered steel includes the following steps:

[0045] a. The molten iron is first smelted in a converter, then LF refined and vacuum treated, so that the C, Si, Mn, P and Cr, Ni, V, N alloy elements in the molten steel meet the composition requirements of 45MnVS non-quenched and tempered steel, and get a preliminary Refining molten steel;

[0046] b. control the mass percentage content of sulfur in the molten steel prepared in said step a to be no higher than 0.005%, the oxygen content to be no higher than 6ppm, and the mass percentage content of aluminum to be no higher than 0.012%, and to control the molten steel temperature At 1566 ~ 1596 ℃, then start to feed the cored wire into the molten steel, and carry out refining and modification treatment on the molten steel; during the refining and mod...

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Abstract

The invention discloses a smelting method for modifying sulfide inclusions in non-quenched and tempered steel or pinion steel. A modification process is mainly realized by the following step: feedinga silicon-magnesium-calcium composite core-spun yarn into refined molten steel, or respectively feeding a silicon-magnesium core-spun yarn and a silicon-calcium core-spun yarn into the refined moltensteel, so that the content of magnesium in the steel is 4-25ppm, and the content of calcium in the steel is 5-25ppm. According to the method, by optimizing the contents of oxygen, sulfur, manganese, calcium, magnesium and aluminum in the steel in a refining process, the sulfide inclusions in the non-quenched and tempered steel and the pinion steel are modified effectively, so that the form, size and distribution of sulfide are controlled, the inclusions in the non-quenched and tempered steel and the pinion steel are transformed into 'internal hard oxide particle and external covered sulfide' composite inclusions, and the quality of special steel is enhanced.

Description

technical field [0001] The invention relates to a preparation method of non-quenched and tempered steel or gear steel, in particular to a refining treatment process of non-quenched and tempered steel or gear steel, and also relates to a method for controlling inclusions, which is applied in the technical field of iron and steel metallurgy. Background technique [0002] Both gear steel and non-quenched and tempered steel are special steels containing sulfur. The inclusion of sulfide in the steel can significantly improve the cutting performance of the steel during the cutting process, which is of great help to reduce the cost of mechanical cutting of steel. Usually, the sulfur element content in non-quenched and tempered steel is 0.03-0.08%, and the sulfur element content in gear steel is 0.02-0.06%. On the basis of ensuring the comprehensive properties of quenched and tempered steel, non-quenched and tempered steel cancels the quenched and tempered heat treatment through mic...

Claims

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Application Information

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IPC IPC(8): C21C7/00C21C7/10C21C7/072C22C38/02C22C38/04C22C38/08C22C38/12C22C38/46
Inventor 付建勋成娟杨乾坤付文笙
Owner SHANGHAI UNIV
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