A kind of low-silicon high-carbon chromium bearing steel and its hot rolling production method

Abstract

The invention relates to low-silicon high-carbon chromium bearing steel. The low-silicon high-carbon chromium bearing steel is prepared from the following chemical components in percentage by mass: 0.80-1.10% of C, 0.01-0.15% of Si, 0.20-0.60% of Mn, 1.20-1.60% of Cr, 0.15-0.50% of Mo, less than or equal to 0.05% of Al, less than or equal to 0.025% of P, less than or equal to 0.020% of S, less than or equal to 0.001% of Ca, less than or equal to 0.003% of Ti, less than or equal to 0.0008% of O, less than or equal to 0.04% of As, less than or equal to 0.03% of Sn, less than or equal to 0.005% of Sb, less than or equal to 0.002% of Pb and the balance of Fe and unavoidable impurities. A production flow comprises the following steps: electric furnace or converter smelting; external refining; VD or RH vacuum degassing; continuous casting; continuous rolling; shearing; stack cooling; finishing; flaw detection; and packaging. A low silicon technology is adopted based on existing high-carbon chromium bearing steel GCr15, and the chemical components are re-designed, so that not only are the demands on strength, hardness, toughness, wear resistance, hardenability and the like of a steel product met, but also the overheating sensitivity and decarburizing and cracking tendency of the steel product are improved.

Description

technical field [0001] The invention belongs to the technical field of special steel smelting, and in particular relates to a low-silicon, high-carbon chromium bearing steel and a manufacturing method thereof. Background technique [0002] Bearings are one of the most important key basic parts of various types of equipment. They are called "joints of high-end equipment". Emerging industries such as motor vehicles and aerospace. There are two main forms of bearing damage, namely contact fatigue damage and wear damage. Due to the working environment of high contact stress, repeated contact fatigue stress and sliding wear, the bearings are required to have high plastic deformation resistance, friction and wear resistance, high rotation accuracy and dimensional accuracy, high dimensional stability, long service life and high reliability. Therefore, higher and higher requirements are put forward for the raw material bearing steel processed into bearings. Bearing steel should h...

AI Technical Summary

Problems solved by technology

But silicon has side effects of machinability and cold formability, while silicon increases overheating sensitivity, cracking and decarburization tendency in steel

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