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

A high-carbon chromium bearing steel and bearing steel technology, applied in the field of special steel smelting, can solve the problems of overheating sensitivity, crack and decarburization tendency increase, machinability and cold forming side effects, etc., to reduce the number of inclusions , the effect of strengthening control

CN107904492BActive Publication Date: 2020-05-15JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2020-05-15

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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.
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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...

Examples

Embodiment Construction

[0044] Below in conjunction with embodiment the present invention is described in further detail.

[0045] Various embodiments of the present invention The present invention and (as a comparison) the chemical composition (wt%) of domestic GCr15 and foreign 100Cr6 bearing steels currently on the market are shown in Table 2 and Table 3.

[0046] Table 2

[0047]

[0048] table 3

[0049]

[0050] The manufacturing process of the high-carbon chromium bearing steel in each embodiment is electric furnace or converter---extra-furnace refining---vacuum degassing (VD or RH)---continuous casting---continuous rolling---shearing or sawing Cutting---stack cooling---finishing---surface and internal flaw detection---packing.

[0051] For specific smelting, high-quality molten iron, scrap steel and raw and auxiliary materials are selected, and high-quality deoxidizers and refractory materials are selected. In the electric furnace / converter production process, the tapping endpoint C ...