Chemical compostion: C: 0.15%-0.20% Si: 0.15%-0.25% Mn: 0.35%-1.50% S: =<0.035% P: =<0.035% Other alloy elements: Adding Cr,Mo,Ni,B,Al,Cu etc alloy elements Hardness: HRC42-48/HRC48-54 Mirostructure: Duplex structure combined martensite and bainite Feature: A,High strength,high tenacity,long service life. B,Low breakage,low dust,low pollution. C,Low wear of the equipments,long life of accessory. D,Reduce dedusting system load; lengthen usage time of dedusting equipments.