Research On Rolling Process Of Wear-resistant And Carbon Steel

With the rapid economy development of our country, the demand for steelmaterials manufacturing in the industry has been larger and larger, and the demand forthe properties of steel materials have been improved in all fie lds. In many ways, thetraditional and single steel materials have been unable to meet the actual needs, thuspromoting the research and exploit of double metal composite material.Q235B carbon steel for substrates and NM450D high strength wear-resistant steelfor composites were studied in this research.15groups of hot rolling composite werestudied respectively to prepare NM450D/Q235B double metal composite plates, thenanalyze the metallographic structure, morphologies and composition of theircompound interfaces, finally get their bonding shear strengths by mechanicperformances. Through these experiments to study the influence of the microstructureand properties of the compound interfaces by different rolling temperature and rollingreduction ratio, we formulated a rational rolling schedule. In addition, through analysisand calculation on the layer thickness ratio distribution of NM450D/Q235B doublemetal composite plates, we determined a set of applicable to the actual productionprocess of hot rolling composite and layer thickness ratio variation curves.Through our research, the bonding shear strengths of NM450D/Q235B doublemetal composite plates developed larger and larger with the increasing of rollingtemperature and rolling reduction rate. When the first rolling reduction rate was morethan50%, NM450D/Q235B double metal composite plates could be combined well,and at70%of the tired backlog rate, its bonding shear strength was the largest. At last,we got the layer thickness ratio variation curves under different thickness specificationof bimetal composite group, based on analysis the of layer thickness ratio changes.