Method for preparing bearing steel

A technology of bearing steel and ton steel, which is applied in the field of bearing steel preparation, can solve the problems that the steel performance is difficult to meet the strict standard requirements, and the non-metallic inclusions are unevenly distributed, so as to reduce the deoxidation task, ensure cooling, and reduce the harm of phosphorus Effect

Active Publication Date: 2014-12-03
SHANDONG IRON & STEEL CO LTD
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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-metallic inclusions, and the performance of the steel is difficult to meet the strict standard requirements

Method used

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  • Method for preparing bearing steel
  • Method for preparing bearing steel
  • Method for preparing bearing steel

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Embodiment 1

[0041] The preparation of embodiment 1, GCr15 bearing steel comprises steps as follows:

[0042] (1) Smelting and alloying

[0043] 50t electric furnace smelting

[0044] Requirements for the smelting process: produce during the good furnace service period, do not repair the furnace during the smelting process, do not use new ladles and new slag wire ladles; the baking temperature of the ladle before use is ≥800°C, and the oxygen pressure at the oxygen lance outlet is 1.2MPa;

[0045] The ingredients of the electric furnace are as shown in Table 1:

[0046] Table 1. Ingredients list Unit: (t)

[0047] lime

light burnt dolomite

scrap steel

molten iron

2.0

0.3

19.60

35

[0048] Electric furnace melting carbon: 1.06%, melting phosphorus 0.018%.

[0049] End point composition of electric furnace: end point carbon 0.37%, end point phosphorus 0.008%.

[0050] Tapping alloying: tap lime, fluorite and slagging agent (calcium aluminat...

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Abstract

The invention relates to a method for preparing bearing steel. The method comprises the following steps of smelting, and alloying; carrying out continuous casting; rolling; carrying out slow cooling, and the like. The chemical components in the bearing steel are controlled in percentage by weight as follows: 0.95%-1.05% of C, 0.20%-0.30% of Si, 0.30%-0.35% of Mn, 0.02%-0.05% of Mo, 1.45%-1.48% of Cr, 0.015%-0.035% of AlS, less than or equal to 0.05% 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 0.05% of Ni, less than or equal to 12*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 bearing steel produced through the method disclosed by the invention, the total oxygen content of a steel product can be stably controlled below 8 ppm, non-metallic inclusions are low in content and uniformly distributed, and good casting blank structure homogeneity, steel quality stability and anti-fatigue property and casting blank segregation grade reduction are achieved.

Description

technical field [0001] The invention relates to a method for preparing bearing steel, which belongs to the technical field of iron and steel smelting. Background technique [0002] Bearing steel is the steel used to make balls, rollers and bearing rings. Bearings are subjected to great pressure and friction during work, so the bearing steel is required to have high and uniform hardness and wear resistance, as well as a high elastic limit. The requirements for the uniformity of the chemical composition of the bearing steel, the content and distribution of non-metallic inclusions, and the distribution of carbides are very strict, that is, the content of non-metallic inclusions is small and the distribution is uniform, and the distribution of carbides is required to be uniform. One of the most demanding steel grades. [0003] Chinese patent document CN102418041A discloses a production method of bearing steel. The cross-section of the continuous casting slab of this steel type...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/44C22C38/42C22C38/40C22C38/22C22C38/20C22C38/18C21C5/52C21C7/10
CPCY02P10/20
Inventor 周艳丽徐峰刘娟董萌崔长安时振明吴兵倪友来马传庆石军强
Owner SHANDONG IRON & STEEL CO LTD
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