Centrifugally cast composite roll for hot rolling

一种离心铸造、复合辊的技术，应用在轧辊、制造工具、金属轧制等方向，能够解决不具备耐磨耗性、抗事故性和抗表面粗糙性等问题，达到优异抗咬合性和抗表面粗糙性、表面损伤少、抗咬合性提高的效果

Active Publication Date: 2016-05-11
PROTERIAL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The outer layer of this composite roll does not contain B at all, so it still does not have sufficient wear resistance, accident resistance and surface roughness resistance

Method used

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  • Centrifugally cast composite roll for hot rolling
  • Centrifugally cast composite roll for hot rolling
  • Centrifugally cast composite roll for hot rolling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～7、 comparative example 1 and 2

[0096] A cylindrical mold 30 (800 mm in inner diameter and 2500 mm in length) having the structure shown in FIG. . After the outer layer 1 is solidified, the cylindrical mold 30 with the outer layer 1 (thickness: 90 mm) formed on the inner surface is erected, and the hollow lower mold 50 (inner diameter 600 mm, and length 1500 mm) for forming the shaft portion 22 is erected. Cylindrical casting mold 30, on cylindrical casting mold 30, vertically set up hollow shape upper mold 40 (inner diameter 600mm, and length 2000mm) that shaft portion 23 forms usefulness, constitutes the static casting casting mold shown in Fig. 2 (b) 100.

[0097] Into the cavity 60 of the static casting mold 100, a nodular cast iron melt having a chemical composition containing C: 3.0%, Si: 2.6%, and Mn: 0.3% is poured from the upper opening 43 , Ni: 1.4%, Cr: 0.1%, Mo: 0.2%, Mg: 0.05%, P: 0.03%, and S: 0.03%, the balance is essentially Fe and unavoidable impurities, and graphite containing Si is inocu...

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Abstract

Provided is a centrifugally cast composite roll for hot rolling in which: an outer layer (1) that is formed by centrifugal casting and an inner layer (2) comprising a ductile cast iron are integrated by welding; the outer layer has a chemical composition that includes, by mass, 1-3% of C, 0.4-3% of Si, 0.3-3% of Mn, 1-5% of Ni, 2-7% of Cr, 3-8% of Mo, 3-7% of V, 0.01-0.12% of B, and a remainder of Fe and unavoidable impurities; the relationship that is represented by Cr / (Mo + 0.5W) < -2 / 3[C - 0.2(V + 1.19Nb)] + 11 / 6 (wherein W = 0 and Nb = 0 when W and Nb are not included) is satisfied; and 1-15% of an MC carbide, 0.5-20% of a charcoal boride, and 0.5-20% of an Mo-based carbide by area ratio are included therein.

Description

technical field [0001] The present invention relates to a composite roll for hot rolling made by centrifugal casting having a composite structure of an outer layer excellent in wear resistance, seizure resistance (accident resistance), and surface roughness resistance, and an inner layer excellent in toughness. Background technique [0002] A heated slab with a thickness of several hundred mm produced by continuous casting or the like is rolled into a steel plate with a thickness of several to tens of mm by a hot-strip rolling mill having a rough rolling mill and a finishing mill. The finishing mill is usually arranged in tandem with 5 to 7 four-high rolling mills. In the case of a 7-stand finishing mill, the first to third stands are called front stands, and the fourth to seventh stands are called rear stands. [0003] A work roll used in such a hot-strip rolling mill is composed of an outer layer in contact with a hot sheet, and an inner layer integrally welded to the inn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B27/02B22D13/02C22C37/00C22C37/04C22C37/08
CPCB22D13/02C22C37/00C22C37/04C22C37/08B21B27/032C22C38/00C22C38/001C22C38/02C22C38/04C22C38/06C22C38/44C22C38/46C22C38/48C22C38/50C22C38/52C22C38/54C22C38/56C22C38/58C22C2204/00B32B15/011C22C37/10C22C38/60B21B27/02
Inventor 服部敏幸小田望野崎泰则
Owner PROTERIAL LTD
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