Method for controlling form of carbide in bearing steel
A bearing steel and carbide technology, applied in the field of iron and steel metallurgy, can solve the problems of increased magnesium volatilization, low magnesium yield, and difficult control of magnesium content, and achieve the effects of improved distribution, simple process, and easy control
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[0043] Example 1
[0044] In this example, high-carbon chromium bearing steel, a typical bearing steel grade, was selected. By changing the composition of the vacuum degassing VD furnace refining slag, the main purpose was to increase the content of MgO in the refining slag; use the example) and the comparative example to smelt bearings. steel.
[0045] The composition of the bearing steel is shown in Table 1, and the specific composition of the refined slag is shown in Table 2.
[0046] Table 1 Chemical composition of bearing steel (wt%)
[0047]
[0048] Table 2 Slag composition during VD treatment (wt%)
[0049]
[0050]
[0051] After the bearing steel is smelted in the ladle refining (LF) furnace, the composition of the vacuum degassing (VD) furnace refining slag is changed. The used refining slag composition is shown in Table 1. The temperature is 1550℃ and the vacuum pressure is 64Pa. The smelting time is 15 minutes.
[0052] In order to compare the effects of different...
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[0068] Example 2
[0069] The effect of different MgO content in refined slag on the spacing of pearlite sheets in annealed bearing steel.
[0070] This embodiment selects high-carbon chromium bearing steel, a typical bearing steel grade, by changing the composition of the vacuum degassing VD furnace refining slag, mainly to increase the content of MgO in the refining slag; refining slag 3 is used respectively (this embodiment) Smelt bearing steel with refining slag 4 and refining slag 5 (comparative example), where refining slag 3 corresponds to material sample 3 (this example), and refining slag 4 and 5 correspond to material samples 4 and 5 (comparative example)
[0071] The composition of the bearing steel is shown in Table 4, and the specific composition of the refined slag is shown in Table 5.
[0072] Table 4 Chemical composition of bearing steel (wt%)
[0073]
[0074] Table 5 Slag composition during VD treatment (wt%)
[0075]
[0076] After the smelting of the bearing st...
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