钢管及冷弯型钢用高性能铸造轧辊的研制开发

以高碳、高铬、高镍、高钼为特征,采用多元合金变质强化,通过铸造、热处理和机加工,山东省四方技术开发有限公司开发出了高性能高铬辊。材料基体组织为奥氏体、贝氏体或马氏体,碳化物主要是M7C3,含量20%左右,显微硬度可达HM1800,并呈不连续的条块状、颗粒状和菊花状。抗拉强度540MPa,冲击韧性7.5J/cm2,距表面120mm处硬度达HRC59.3。用于矫直辊及焊管轧辊,材料利用率达77.5%以上。同时指出,轧辊制造的发展趋势是高性能、高合金化、以铸代锻及双金属结构等。

Development of High Quality Casting Roll for Steel Pipe Straightening and Cold Roll Formed Steel

Through multialloy strengthening modification treatment, Shandong Province Sifang Technical Development Co., Ltd. has developed high quality casting roll which make a feature of high C, Cr, Ni and Mo content. The basic microstructure of material is austenite, bainite and martensite, the carbide is mainly M7C3 and its content is about 20%, the micro hardness is up to HM 1 800, the microstructure is appeared as no continuous stripe state, block state, particle atate and chrysanthemum state, the tensile strength is 540 MPa, the impact toughness is 7.5 J/cm2, the hardness distanced 120 mm from surface is HRC 59.3. The utilization coefficient of material for producing roll is up to above of 77.5%. The article also point out that the developing trend of roll process is toward high quality, high alloying, replaced forging by casting, and bimetal structure, etc.