Development and Production Practice of LGP20CH Pre-hardened Die Steel in Laiwu Steel
WU Huiliang
YI Zhongwen
HUO Xiaoxin
HUANG Shaowen
Abstract：Through the reasonable chemical composition design and adopting the converter-LF-RH-continuous casting-controlled rolling-pre-hardening process, LGP20CH die steel was successfully developed and was entered batch production now. The product quality inspection showed that the plates have a high purity with B type inclusions below 1.5 level, the microstructure of plates is tempered sorbite, the grain size of plates is above 9 grade, and all of plates have passed the ultrasonic testing, without blowhole, pinhole defects;Moreover, the hardness fluctuation of whole plate is within 4 HRC, completely meeting user’s requirements.
Keywords：die steelLGP20CHpre-hardeningheat treatmenthardness
Publication Date：2013-11-01
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：3( 17-18,20 )