Outer layer of rolling roll and composite roll for rolling

Patent metadata

Field	Value
Publication number	US-11052440-B2
Application number	US-201716089204-A
Country	US
Kind code	B2
Filing date	Mar 28, 2017
Priority date	Mar 31, 2016
Publication date	Jul 6, 2021
Grant date	Jul 6, 2021

Abstract

An outer layer of a rolling roll having a chemical composition comprising by mass 1.3-2.8% of C, 0.3-1.8% of Si, 0.3-2.5% of Mn, 0-6.5% of Ni, 1-10% of Cr, 0.9-6% of Mo, 0-8% of W, 0.5-6% of V, 0-3% of Nb, and 0% or more and less than 0.01% of B, the balance being Fe and inevitable impurities, and meeting the formulae (1): 1000≤1177−52C+14Si−11Mn+6.8Cr+1W+0.65Mo+12V+15Nb≤1115, and (2): 5≤Cr+Mo+0.5W+V+1.2Nb≤15, wherein C, Si, Mn, Cr, W, Mo, V and Nb represent % by mass of these elements, and a structure containing eutectic carbide without graphite.

First claim

What is claimed is:

1. An outer layer of a rolling roll having
a chemical composition comprising by mass 1.3-2.8% of C, 0.3-1.8% of Si, 0.3-2.5% of Mn, 0-6.5% of Ni, 1-10% of Cr, 0.9-6% of Mo, 0-8% of W, 0.5-6% of V, 0-3% of Nb, and 0% or more and less than 0.01% of B, the balance being Fe and inevitable impurities, and meeting the following formulae (1) and (2):
(1): 1000≤1177−52C+14Si−11Mn+6.8Cr+1W+0.65Mo+12V+15Nb≤1115, and
(2): 5≤Cr+Mo+0.5W+V+1.2Nb≤15,
wherein C, Si, Mn, Cr, W, Mo, V and Nb represent % by mass of these elements, and a structure containing eutectic carbide without graphite.

2. The outer layer of a rolling roll according to claim 1 , wherein the lowest solidification heat generation start temperature among those measured by differential thermal analysis is 1100° C. or lower.

3. The outer layer of a rolling roll according to claim 1 , wherein said outer layer further comprises at least one selected from the group consisting of 5% or less by mass of Co, 0.5% or less by mass of Zr, 0.5% or less by mass of Ti, and 0.5% or less by mass of Al.

4. A composite roll for rolling comprising the outer layer according to claim 1 and an inner layer, wherein said outer layer is integrally fused to said inner layer.

5. The composite roll for rolling according to claim 4 , wherein said inner layer is made of ductile cast iron.

6. The composite roll for rolling according to claim 4 , wherein said outer layer is formed by a centrifugal casting method.

Assignees

• Hitachi Metals Ltd

Inventors

• Nozaki Yasunori
• Oda Nozomu
• Fukumoto Shiho

Classifications

• B21B27/032

  Rolls for sheets or strips · CPC title

• B32B15/011

  all layers being formed of iron alloys or steels · CPC title

• C22C38/46

  with vanadium · CPC title

• B21B27/005

  Rolls with a roughened or textured surface; Methods for making same · CPC title

• C22C38/48

  with niobium or tantalum · CPC title