High-strength toughness steel ball and production method thereof
A high-strength toughness, steel ball technology, applied in the field of steel materials, can solve the problems of low toughness, plasticity and impact toughness, and achieve the effect of uniform hardness distribution and good impact toughness
Active Publication Date: 2016-08-24
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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Problems solved by technology
[0003] However, due to the high carbon content, this type of steel ball is characterized by high strength and hardness and low ductility, especially impact toughness. Generally, the impact toughness of unnotched samples at the 1 / 2 radius of the steel ball or the center of the ball is low. At 20J, the proportion of cracks in the application process is relatively high, and regular inspection, selection, and replacement are required. It is not the best choice for industries with high requirements in the field of ball milling
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[0015] The present invention adopts the following chemical composition, by weight percentage, containing 0.15%-0.30%C, 1.30-2.00%Si, 1.50%-2.50%Mn, 0.50%-1.00%Cr, 0.20-0.50%Mo, and the balance is Fe And unavoidable impurities: the steel with the above chemical composition is rolled into steel balls, and then hot-rolled and air-cooled to room temperature, the microstructure of steel balls is eutectoid ferrite + bainite + martensite + a small amount of residual austenite It is different from the existing pearlitic steel balls, which are dominated by pearlite and contain a small amount of ferrite at room temperature.
[0016] The molten steel containing the above components is smelted in a converter or an electric furnace, and after LF refining and RH vacuum treatment, it is cast into a 200mm×200mm-450mm×450mm continuous casting slab: the use of LF treatment is mainly to reduce the content of harmful elements such as S in the steel and improve the quality of the steel. Purity: Th...
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Abstract
The invention relates to a high-strength and high-toughness steel ball and a production method of the high-strength and high-toughness steel ball. The high-strength and high-toughness steel ball comprises, by weight, 0.15 percent to 0.3 percent of C, 1.3 percent to 2.0 percent of Si, 1.5 percent to 2.5 percent of Mn, 0.5 percent to 1.0 percent of Cr, 0.2 percent to 0.5 percent of Mo and the balance Fe and inevitable impurities. A preparation method comprises the following steps that molten steel is smelted; a continuous casting billet is formed through casting; the casting billet is heated and then rolled; the continuous casting billet is heated to 1,150 DEG C to 1,300 DEG C, and is rolled after heat preservation is carried out for 1 h to 4 h; a steel ball blank is formed; the steel ball blank is heated to 1,100 DEG C to 1,250 DEG C, heat preservation is carried out for 10 s to 60 s, a needed section steel ball is obtained through forging, and final forging temperature ranges from 900 DEG C to 1,050 DEG C; air cooling is carried out on the forged steel ball till the temperature of the surface layer of the steel ball ranges from 750 DEG C to 850 DEG C, then the steel ball is quenched in water, when the temperature of the surface layer of the steel ball is reduced to 60 DEG C to 80 DEG C, the steel ball is taken out fast, tempering is carried out, then oil removal and finishing treatment are carried out, and the steel ball is obtained. The steel ball has high rigidity and good impact toughness.
Description
technical field [0001] The invention relates to a steel material, in particular to a high-strength toughness steel ball and a production method thereof. Background technique [0002] At present, the forged steel balls widely used in the field of ball mills are mostly ferritic-pearlitic steel or pearlitic steel with a carbon content of 0.60%-0.85%. , V, Nb, Ti and other elements, after quenching and tempering, the surface hardness of steel balls with a diameter of 80-150mm can reach above 60HRC, the hardness of the core of a steel ball with a diameter of 80mm is not less than 55HRC, and the hardness of the core of a steel ball with a diameter of 150mm The hardness is not less than 40HRC. It has the characteristics of low production cost, simple process and high yield. The comprehensive performance of steel balls basically meets the grinding needs of general ball mills. [0003] However, due to the high carbon content, this type of steel ball is characterized by high strength...
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IPC IPC(8): C22C38/38B23P15/00B02C17/20
Inventor 韩振宇邹明郭华汪渊邓勇
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP