DEVELOPMENT OF ROLLS FOR A STRETCH-REDUCING MILL

Rolls for a stretch-reducing mill should be of low inner layer hardness, certain depth of coldhardened surface layer as well as excellent wear and heat resistances, All technical targets of the centrifagally-composited and cold-hardened middle-alloy rolls, developed jointly by both Tianjin Seamless Steel Tube Plant and Shanghai Xinhu Iron and Steel Works, are better than those of the rolls imported from Germany. The paper gives a brief introduction to the technical requirements, chemical compositions, developing process and equipments, and also the test result,