MANUFACTURE OF HOT ROLLING ROLL MATERIAL AND ROLL

Title:

MANUFACTURE OF HOT ROLLING ROLL MATERIAL AND ROLL

Document Type and Number:

Japanese Patent JPH03219047

Kind Code:

A

Abstract:

PURPOSE: To manufacture a hot rolling roll having excellent durability, at the time of manufacturing a hot rolling roll, by using high carbon low alloy cast iron as a matrix, forging stock contg. high hardness metallic carbides having the shape of fine grains and thereafter executing hardening and tempering.

CONSTITUTION: This hot rolling roll is manufactured by subjecting stock having a barrel containing a compsn. contg., by weight, 1.5 to 2.5% C, <1.2% Si, <1.2% Mn, 1.5 to 6.0% Cr and 4.5 to 8.0% V, contg. Mo and W so as to satisfy 1.5 to 5.0% Mo+0.5W, furthermore contg. one or more kinds among <3% Ni, <5% Co, <2% Nb and <2% Ti and the balance Fe as well as satisfying C=%V×0.24+(0.4 to 1.0)% and 0.3Cr+Mo+0.5W>2.6% and having a structure in which hard metallic carbides having the properties of >2100 Vickers hardness, >45μm average grain size (d) an <14% areal rate E1 as well as >6.7×10-3 E1/d are dispersed into a matrix having >550 Vickers hardness to forging, hardening and tempering treatment.

Inventors:

KUDO TOSHIHIRO
KURAHASHI TAKAO
KOGA TAKAHIKO

Application Number:

JP1298390A

Publication Date:

September 26, 1991

Filing Date:

January 23, 1990

Export Citation:

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Assignee:

KANTO SPECIAL STEEL WORKS LTD
NIPPON STEEL CORP

International Classes:

B21B27/00; C21D9/38; C22C38/00; C22C38/52; (IPC1-7): B21B27/00; C22C38/00; C22C38/52

Domestic Patent References:

JPS5887249A	1983-05-25
JPS63199092A	1988-08-17
JPS5380351A	1978-07-15
JPH0196355A	1989-04-14

Attorney, Agent or Firm:

Shoichi Hirose (1 person outside)

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