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pISSN : 1598-706X / eISSN : 2288-8381


(논문)연구논문

한국주조공학회지 (16권2호 124-131)

High Temperature Properties of the High Speed Steel Roll of Hot Finishing Mill

열간 압연용 고속도강 롤의 고온 특성

Tae-Woo Kim, Jin-Won Choi*, Dong-Gyu Kim

Dong-A University, * POSCO

Abstract

High temperature properties such as hot hardness and thermal fatigue resistance of high speed steel roll of hot finishing mill have been investigated. Two kinds of roll having compositions, Fe-1.75%C-5.9%Cr-1.74%Mo-4.94%V- 2.03%W(A specimen) and Fe-2.27%C-8.86%Cr-2.91%Mo-3.92%V-1.86%W(B specimen)were prepared for investigating the microstructure and crack propagation mode. A specimen has greater amounts of M_7C_3 type carbides and less amounts of MC type carbides in comparison with B specimen. Hot hardness showed sudden decrease over 400℃, resulting in the hardness decrease of 50% at the temperature of 600℃, and showed little variation with time at 500℃ and 800℃. Thermal crack was developed at 550℃ in A specimen and 600℃ in B specimen.

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