The high speed steel of composite roll is characteristic of high carbon and high alloy elements . so it is easy to form a lot of netlike carbides . these carbides which are very hard and fragile and are very difficult to be eliminated by heat treatment can depress the properties of high speed steel 复合轧辊用高速钢具有高碳和高合金的特征，容易形成大量网状碳化物，这些网状碳化物又硬又脆，会严重降低高速钢的性能，且难以用热处理的方法予以消除。
