Refined slag used in steel-making process for bearing steel

A technology of refining slag and bearing steel, which is applied in the field of bearing steel smelting technology, can solve the problems of unsatisfactory control effect of B-type inclusions in steel, affecting the performance of bearing steel, desulfurization effect and other problems, achieving strong adsorption capacity and improving quality , the effect of fast slag formation

Inactive Publication Date: 2012-04-11
BAOSHAN IRON & STEEL CO LTD
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High alkalinity slag is beneficial to control type A and type C inclusions in bearing steel, but it is easy to form calcium aluminate spherical inclusions in refined bearing steel, and the control effect on type B inclusions in steel is not ideal, making the bearing Type B and D inclusions in the steel exceed the specified requirements, which affects the performance of the bearing steel; low-basicity slag has a good control effect on the B-type inclusions such as alumina and calcium aluminate-type D-type inclusions in the steel, However, its desulfurization effect is affected, and the control of Type A inclusions (sulfides) and Type C inclusions (silicates) in steel is not ideal

Method used

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  • Refined slag used in steel-making process for bearing steel
  • Refined slag used in steel-making process for bearing steel

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with embodiment.

[0024] With CaO, Al 2 o3 , SiO 2 , MgO and Al components such as (highly active metallurgical lime, calcium aluminate pre-melted slag, wollastonite, dolomite and metallic aluminum) are made into 10 after crushing→batching→mixing→forming→drying and other processes -40mm size and shape, add ladle during electric furnace / converter tapping and LF refining process, adding amount is 15-20kg / t.s.

[0025] Four kinds of refining slags for bearing steel were used to test, and their compositions and application effects are shown in Table 1. It can be seen from the table that by adopting the refining slag for bearing steel of the present invention, the total oxygen content and sulfur content of the bearing steel can reach a good level.

[0026] Table 1

[0027]

[0028] Table 2 shows the improvement effect of the four groups of bearing steel refining slags in Table 1 on the coarse and fi...

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Abstract

The invention provides refined slag used in a steel-making process for bearing steel, which comprises the following raw materials by weight percentage: 45-55% of CaO, 14-20% of Al2O3, 14-18% of SiO2, 3-12% of MgO, 3-8% of metallic aluminum, less than or equal to 0.15% of Ti, less than or equal to 0.050% of P+S and the balance of impurities. The granularity of refined slag is 10-40mm. The CaO/SiO2 value can be controlled in the range of 2.7-3.5. The refined slag can effectively control the form, the composition, the size distribution and the like of the impurities in steel and has obvious effect for improving the quality of the bearing steel. The slag system has the advantages of fast slag forming speed, strong deoxidation and desulphurization capability, strong adsorption capability on impurities, controllable compositions and types of impurities in steel and the like.

Description

technical field [0001] The invention relates to a bearing steel smelting process, in particular to a refining slag used in the bearing steel steelmaking process. Background technique [0002] Bearing steel is the raw material for manufacturing metal bearings. It is mainly used to manufacture bearing balls and rolling rings. It has high hardness, strength and wear resistance. Since the contact area of ​​the bearing is small when it is working, and it is subjected to repeated and constantly changing stress at a high speed, the quality requirements for the bearing steel are relatively high. Generally widely used bearing steel is GCr15. [0003] The main items to test the quality of bearing steel are contact fatigue strength and impact toughness, and the most influential ones are [O], [H] and the type, quantity, size and distribution of inclusions in the steel, among which the oxide inclusions Al 2 o 3 and point-like inclusions - mCaO nAl 2 o 3 It is the most harmful to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/076
CPCY02P10/242Y02P10/20
Inventor 杨宝权柳向椿黄宗泽万根节
Owner BAOSHAN IRON & STEEL CO LTD
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