Ф5.4m特大型水泥磨机超高铬铸铁磨头板的研制与应用

Developing and Application of Super High Cr Cast Iron Φ5.4m Mill Bed Plate

针对水泥工业大型和特大型球磨机磨头板的使用要求,研制开发生产的Cr26高铬铸铁材料,其主要化学成分为:2.6%～2.9%C,22%～28%Cr,<1.2%Si,0.5%～1.0%Mn,0.6%～1.2%Mo,0.4%～1.2%Ni,0.4%～1.2%Cu。热处理工艺:淬火温度1000±20℃,回火温度320～420℃。平均硬度HRC>58,平均冲击韧性ak>5J/cm2。淬火回火组织为:回火马氏体+共晶碳化物M7C3+二次碳化物+残余奥氏体。Cr26高铬铸铁磨头板已连续运转6年以上,预计仍能连续使用2年左右。

For meeting the service requirements for super heavy ball mill bed plate used in cement industry,the main chemical compositions of the developed Cr26 high Cr cast iron are as follows：2.6% ～ 2.9% C,22% ～28% Cr, 〈1.2% Si,0.5% ～1.0% Mn,0.6% ～1.2% Mo,0.4% ～1.2% Ni,0.4% ～1.2% Cu.Heat treatment program： quenching temperature 1000℃±20℃ ,tempering temperature 320 ～420℃.Average hardness HRC〉58 and average impact toughness ak〉5J/cm^2.Microstructure temper martensite＋eutectic carbide M7C3＋secondary carbide＋residual austenite. The produced C26 high Cr cast iron mill bed plate has been being in operation for more than 6 years and a two years period of service life is available.