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Analysis of the purity of GCr15 bearing steel produced by converter
Source: Bearing network time: 2013-07-04
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Today, Sumitomo, TYSSEN and Kawasaki Steel Corporation of Japan have successively developed the production process of GCr15 bearing steel by using hot water through converter; and cooperated with LF ladle scouring and RH vacuum treatment process to improve the purity of molten steel to produce GCr15 bearing steel. Excellent mineral resources; all kinds of harmful impurities are very low; it is guaranteed for the production of fine steel. Bengang built a new four-flow rectangular billet continuous casting machine in the steel mill in 2005; now it has successfully produced GCr15 bearings. Steel. In order to know the purity of GCr15 bearing steel during each period of exercise; respectively, after the converter, LF essence, RH vacuum treatment, medium package, continuous casting blank sampling; analysis of non-metallic inclusions.
1. GCr15 bearing steel exercise process road: hot metal pre-treatment → converter exercise → LF ladle scouring → RH vacuum cycle degassing → rectangular billet continuous casting.
2. GCr15 bearing steel exercise process steel purity analysis 2.1 after the converter after the non-metallic inclusions after the converter exercise; sampling in the molten steel analysis of non-metallic inclusions: the spread of the collection; there are more large-scale clusters Non-metallic inclusions; a few large-scale block-like non-metallic inclusions. The cluster-like composition is Al2O3-SiO2; the block inclusions are CaO-Al2O3. The whole-iron loading and single-slag training method is used for the converter exercise; In the lime and fine slag, the ladle top slag is modified and treated. After the inclusions are detected; the scale of non-metallic inclusions is larger; the disposal is not very perfect.
2. 2LF ladle after the essence of non-metallic inclusions LF ladle after the essence; sampling in steel water to analyze the condition of non-metallic inclusions: 涣 scattered; a few clusters of non-metallic inclusions; a single large-scale spherical non-metallic inclusions. The group component is CaO-Al2O3; the spherical inclusion component is CaO-Al2O3-MgO; the Zr element between them is brought from the sampler. According to the oxygen value, the "white residue" process is used for conditioning; after the essence, the inclusions have Change; cluster size of non-metallic inclusions significantly reduced. 怯æŽè°•èœ’醪锖 饔 饔 å‚» å‚» æ¯ æ¯ æ¯ æ¯ æ¯ æ¯ æ¯ æ¯ å‚» å‚» å‚» å‚» å‚» å‚» å‚» å‚» å‚» å‚» ç²¾ ç²¾ ç²¾ ç²¾ ç²¾ ç²¾ ç²¾ ç²¾ ç²¾ ç²¾ ç²¾ ç²¾
2. 3RH vacuum cycle degassing after non-metallic inclusions RH vacuum cycle degassing; sampling in steel water to analyze the condition of non-metallic inclusions: 涣 scattered; firstly small-scale non-metallic inclusions; Scale-like non-metallic inclusions. The composition of larger-scale inclusions is CaO-Al2O3; the small-scale spherical inclusions in the majority are Al2O3-MgO-SiO2-CaS. No clusters of inclusions were found during this period; Because there are about 15.8μm inclusions to clarify the progress in the disposal of molten steel during the quintessence.
2.4 The condition of non-metallic inclusions in the steel in the steel in the water in the steel is analyzed by the non-metallic inclusions: scattered and scattered; a small number of small-scale clusters of non-metallic inclusions; mostly small-scale spherical inclusions. Small The composition of the scale non-metallic inclusions is Al2O3-MgO-CaO-K2O; the small-scale cluster inclusions detected here are composed during the sampling process; it is composed of open spaces between the grains.
3. Quantitative metallographic analysis of non-metallic inclusions in rectangular blanks. The condition of non-metallic inclusions is analyzed at different thicknesses of rectangular blanks. The outer diameter of the rectangular blank is 10mm, 1/4 thickness, middle, 3/4 thickness. Sampling; then the number and scale of non-metallic inclusions are calculated by using 100 sampling fields under 500 times. It can be seen from the slab that non-metallic inclusions are scattered and scattered; the scale is relatively small. The composition of non-metallic inclusions is Al2O3- Composite inclusions composed of MgO-SiO2-CaS and TiO.
4. Conclusion 1. Steel is in the process of exercise; the purity of molten steel is constantly improving.
2. After the analysis of the non-metallic inclusions in each process; the composition of the primary inclusions is primarily Al2O3-MgO-CaO. The total number of non-metallic inclusions is less; the overall scale is mainly small-scale inclusions below 10μm, and there is a single Large-scale inclusions; the composition is dominated by Al2O3. It is necessary to clarify the level of control of inclusions. The disposal requirements after deoxidation are further adjusted.
3. Because there is a very small amount of K2O; this is caused by a small amount of slag remaining in the molten steel; the demand for molten steel in the exercise process is focused on the control of the slag.
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