METHOD FOR HEAT-TREATING HIGH-SPEED STEEL SERIES CAST IRON MATERIAL CONTAINING GRAPHITE AND COMPOSITE ROLL

Japanese Patent JP3230899

B2

PURPOSE: To provide a heat treating method suitable for a high-speed steel series cast iron material and a composite roll in which the external layer is provided with the same cast iron material.
CONSTITUTION: A high-speed steel series cast iron material having a chemical compsn. essentially contg., by weight, 1.8 to 3.6% C, 1.0 to 3.5% Si, 0.1 to 2.0% Mn, 0.5 to 10.0% Ni, 2.0 to 10% Cr, 0.1 to 10% Mo, 0.1 to 10% W and total 1.0 to 10% of one or two kinds of V and Nb, and the balance substantial Fe and contg. graphite or the external layer of a composite roll in which the external layer is formed of the same high-speed series cast iron material and the inside is provided with an internal layer constituted of iron steel is subjected to austenitizing heat treatment at 950 to 1150°C, is thereafter subjected to hardening heat treatment to 600°C at ≥200°C/hr cooling rate and is subsequently subjected to tempering heat treatment at 460 to 590°C. In this way, the improvement of its wear resistance can be attained.

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WO/2017/170570	ROLLING ROD OUTER LAYER AND COMPOSITE ROLLING ROD

Cho Morikawa
Yoshito Seto
Akitoshi Okabayashi
Hiroaki Katayama
Hiroyuki Kimura

JP13777093A

November 19, 2001

June 08, 1993

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Kubota Corporation

B21B27/00; C21D5/00; C21D9/38; C22C37/08; (IPC1-7): C21D5/00; B21B27/00; C21D9/38; C22C37/08

JP4176841A
JP63195245A
JP353042A
JP5271855A

Toshio Yasuda

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