Novel high-carbon chromium bearing steel
A high-carbon chromium bearing steel, a new type of technology, applied in the field of new high-carbon chromium bearing steel, can solve the problems of high price of carburized steel, waste of raw materials, economic losses, pollution of the environment, etc., and achieve heat treatment cost saving, low heat treatment cost, and low price high effect
Inactive Publication Date: 2013-12-04
BAOTA IND CO LTD
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Problems solved by technology
[0003] However, the carburizing process needs to be added during the heat treatment of carburized steel bearings, and the cost of heat treatment is 2-4 times higher than that of high-carbon chromium bearing steel, and a large amount of CO is emitted outward. 2 and CO, seriously polluting the environment
More importantly, the utilization rate of steel in my country's bearing industry is only 40%-45%, and the price of carburizing steel is expensive (higher than 16,000 yuan / ton), resulting in serious waste of raw materials and huge economic losses, which also make enterprises unbearable burden
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[0010] The invention provides a new type of high-carbon chromium bearing steel, which is produced by electroslag, has uniform chemical composition, low content of Ti element, high impact toughness and hardenability, and high contact fatigue life and wear resistance. For high carbon chromium bearing steel, the impact toughness is higher than that of high nickel and chromium carburized bearing steel. Composed by mass percentage:
[0011] element C Si mn Mo P S Ni Cu V Ti O margin content% 0.82 0.87 0.99 0.35 0.015 0.001 0.03 0.05 0.24 0.0024 0.0019 Fe
[0012] The above-mentioned high-carbon chromium bearing steel smelting and bearing manufacturing process are: electric furnace smelting → LF refining + VD degassing treatment → casting electrode billet → electroslag remelting → electroslag ingot annealing → forging product + annealing → Roll forming of ring parts → spheroidizing annealing of ring parts → turning processing → mar...
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Abstract
The invention relates to novel high-carbon chromium bearing steel which is characterized by comprising the following components by mass percent: 0.80-0.85% of C, 0.70-1.00% of Si, 0.90-1.20% of Mn, 0.30-0.40% of Mo, 0.20-0.30% of V, 0-0.025% of P, 0-0.025% of S, 0-0.10% of Ni, 0-0.10% of Cu, 0-0.003% of Ti, 0-0.003% of O and Fe in balancing amount. According to a laboratory test, the novel high-carbon chromium bearing steel (G8OSiMnMoV) disclosed by the invention, after quenching tempering, is three to four times higher than high-carbon chromium bearing steel in impact toughness, higher than carburization bearing steel in impact toughness and better than high-carbon chromium bearing steel in quenching degree and hardenability, has the using effective thickness of 70 mm, does not need to be carburized, is low in heat treatment cost, and can replace carburizing steel to produce bearings with greater impact load used in the filed of metallurgy, mine, rolling mill, train and the like.
Description
technical field [0001] The invention relates to a novel high-carbon chromium bearing steel. Background technique [0002] There are basically two types of steel currently used in the manufacture of bearings in my country: high-carbon chromium bearing steel (GCr15, GCr15SiMn, GCr15SiMo, GCr18Mo, etc.) and carburized bearing steel (G20CrNiMo, G20CrNi2Mo, G20Cr2Ni4, etc.). High-carbon chromium bearing steel has high hardness, high strength, and good wear resistance. It can be used to make general bearings, but its biggest disadvantage is poor impact toughness. It is used to make bearings with heavy impact loads such as metallurgy, mines, rolling mills, and trains, which are prone to premature fatigue and fracture. For bearings with high impact load, it is necessary to use carburized bearing steel to manufacture. Carburized bearing steel not only has high hardness, high strength and good wear resistance, but also has good impact toughness. It is a high-performance bearing stee...
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IPC IPC(8): C22C38/12C22C38/16
Inventor 陶惠芳陶治安何强张培强吴星李文琴孙建梅李广智
Owner BAOTA IND CO LTD