New Ball Mill Liner Wear-resistant Steel Research And Production Applications

This paper designed a new kind of anti-wearing cast steel which is also called CHMe steel after reviewed the development of anti-wearing iron and steel and analysed the wear behaviour of the lining boards using in ball mills, the actions of alloy elements and the particular demands of lining boards using in DEXIN copper mine's ball mills. The controlled alloy elements' composition range is list as follows: C: 0.7%-0.9%, Si: 0.2%-0.4%, Mn: 0.3%-0.5%, Cr: 2.8%-3.2%, Ni: 0.4/%-0.6%, W: 0.05%-0.1%, Ti: 0.03%-0.05%, V: 0.005%-0.01%; Mo: 0.3%-0.5%, Cu: 0.3%-0.5%. P: <0.06% S: <0.06%. The cast structure, the quenched structure and mechanical property, the anti-wearing property and the producing process of the CHMe steel has been studied in the paper. The main contents of the experiments includes such items as follows: design of the new wear-resisting cast steel's chemical composition, determination and analysis of the new wear-resisting steel's quench degree and CCT curve, ananysis of the cast structure, study of the new wear-resisting steel's heat treatment process.Some useful conclusions have get from the result of the above experiments. The new wear-resisting steel's quench degree is so good that it can meet the demand of huge ball mills. The mechanical properties and anti-wearing property of CHMe steel are best after the heat treatment of quenching after austenized at 900X-950 and tempering at 500-550 for 2 hours. The hardness, the intensity and the toughness can exceed HRC44, 1500MPa and 50J/cm2 apart. The anti-wearing property of CHMe steel is 15 percent to 35percent higher than ZGMnl3, which is a widely used anti-wearing steel. The reason of the excellent mechanical properties and anti-wearing property of CHMe steel is that the heat treatment sturcture of CHMe steel is composed of tempered martensite, bainite, temper troostite, remaining austenite and carbonide.Industrial application and the analysis of technological economy showed that CHMe steel lining board's producing process is simple and controllable and the duriablity of CHMe steel lining board is 30 percent higer than ZGMnl3 lining board while the first price of CHMe steel lining board is little higer than ZGMnl3 lining board. It is feasible and economic to produce CHMe steel lining board instead of ZGMnl3 lining board with high ratio of property to price.