Technology for producing high-purity high-carbon high-chromium bearing steel

A high-carbon chromium bearing steel and a production method technology, which are applied in the improvement of process efficiency, electric furnaces, furnaces and other directions, can solve problems such as unseen production methods, and achieve the effects of strong equipment and process versatility and wide process applicability

Inactive Publication Date: 2002-09-18
BAOSTEEL SPECIAL STEEL CO LTD
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Problems solved by technology

[0004] At present, it can meet the ultra-high purity of high-carbon chromium bearing steel required by precision bearing manufacturers (the oxygen content and titanium content in the steel should not be greater than 7×10 respectively) -6 and 12×10 -6 ) of the bearing steel manufacturers required by the manufacturer, there is no literature report on the production method in China; there are only two companies in Japan, Gaozhou and Wakayama, and the former produces high-carbon chromium bearing steel. Furnace electromagnetic stirring and argon blowing stirring combined refining-die casting; the production process of the latter is: converter-RH refining-continuous casting; but neither of them has been reported in detail

Method used

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Embodiment Construction

[0025] specific implementation plan

[0026] A certain iron and steel company implements the patent of the invention and smelts 3 furnaces of steel (see Table 1 for the smelting process data and results). carbon agent and aluminum deoxidizer)--100 tons of ladle furnace refining (bottom blowing argon)--100 tons of vacuum furnace degassing--die casting. In the first step, in the DC electric furnace, by inputting DC current and oxygen, the charged charge is melted into molten steel in the temperature range of 1560-1650 °C, and the chemical composition range of the oxidizing slag above the molten steel is controlled (CaO ≥40%: FeO≥15%; SiO 2 ≥20%; MnO≤10%; MgO≤10%; P 2 o 5 ≥5%), and by inputting oxygen at about 23-37 m3 / ton of steel into molten steel and intermittently flowing out oxidative slag and supplementing lime of 6-8 kg / ton of steel: reducing the residual titanium content in steel to 3×10 -6the following. The second step, (1) preparation of the ladle for receiving th...

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Abstract

A process for preparing super-purity high-C high-Cr bearing steel includes smelting in electric furnace, intermittently flowing out oxidative slags while adding lime, inputting oxygen in molten steel, tapping in ladle while adding special slags, alloy, carbonizer and deoxidizing agent, blowing argon gas from bottom of ladle, refining for 40-60 min, vacuum treating for 20-35 min, and casting ingots. Its advantages are ultrahigh purity and low contents of oxygen and Cr.

Description

technical field [0001] The invention relates to a method for smelting alloy steel in the metallurgical industry, in particular to a method for smelting and producing bearing steel. Background technique [0002] The purity of the century-old high-carbon chromium bearing steel is closely related to the life of the bearing. In the 1980s, the main indicator of purity was the oxygen content in steel: the lower the oxygen content, the longer the bearing life; the oxygen content of high-carbon chromium bearing steel in Japan, Sweden and other countries has been controlled at 10×10 -6 the following. In the early 1990s, with the continuous research on the factors affecting bearing life and the market demand for precision subwoofer and silent bearings, it was found that the main factors affecting bearing life are not only oxygen content, but also titanium content and sulfur in steel. content; the lower the titanium content and sulfur content, the higher the bearing life. Especially...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/52C22C33/04C22C33/06
CPCY02P10/20
Inventor 虞明全王治政徐明华陈新建陆江帆沈顺德
Owner BAOSTEEL SPECIAL STEEL CO LTD
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