APPLICATION OF INTENSIVE QUENCHING PROCESS FOR STEEL MILL ROLLS MADE OF DUCTILE IRON

摘要

- The paper discusses basics of the high performance intensive quenching (IQ) process and presents the results of the case study on the application and commercialization of the IQ process for steel mill rolls made of Dura-Bar? continuously cast ductile iron (IQDI). Data on the production rolls' microstructure, microhardness, residual surface compressive stresses and service life after intensive quenching and conventional oil quenching are compared. The paper also presents the results of the study on the improvement of ductile iron material lubricity due to the use of the IQ process compared to conventional quenching. Field data shows that intensively quenched ductile iron roll service life doubled versus standard air hardened (D2 alloy) or oil quenched ductile iron castings. The intensively quenched ductile iron rolls were tested in several major steel mills in the USA: sizes range from 60mm in diameter to 450mm in diameter.