Outer layer material of composite roll for rolling and composite roll for rolling

一种外层材料、复合辊的技术，应用在轧辊、金属轧制、金属轧制等方向，能够解决耐表面粗糙性降低、辊表面损伤加深、辊寿命变短等问题，达到耐表面粗糙性优异、降低磨削频率、降低消耗的效果

Inactive Publication Date: 2019-08-06
KUBOTA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The formation of cavities reduces the surface roughness resistance of the outer layer and the damage to the roll surface deepens, so the life of the roll may be shortened

Method used

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  • Outer layer material of composite roll for rolling and composite roll for rolling
  • Outer layer material of composite roll for rolling and composite roll for rolling
  • Outer layer material of composite roll for rolling and composite roll for rolling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0069] Alloy melts with various components shown in Table 1 were melted in a high-frequency induction furnace and subjected to centrifugal casting. Adjustment is made so that the solidification rate of the outer layer material during casting is 8 mm / min or more. In Table 1, Embodiments 1 to 5 are invention examples. In addition, Comparative Example 1 and Comparative Example 2 are outer layer materials in which the amount of B exceeds 0.01%.

[0070] [Table 1]

[0071]

[0072] After molding the outer layer material, the inner layer is molded to make a composite roll for rolling.

[0073] Quenching was given to the obtained composite roll for rolling. During quenching, forced air cooling was performed using a large fan, and the cooling rate of the roll surface from the austenitizing temperature to 700°C was 900°C / h or more.

[0074] For the rolling composite rolls of Examples and Comparative Examples that have been quenched, after mechanical processing, a plurality of te...

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Abstract

[Problem] The present invention provides: an outer layer material of a composite roll for rolling, in which the surface roughness resistance can be improved by reducing the amount of B in the secondary eutectic carbide; and a composite roll for rolling using it as the outer layer roll. [Solution] The outer layer material of the rolling composite roll of the present invention is an outer layer material of a rolling composite roll, which contains, in mass %: C: not less than 1.8% and not more than 2.5%, Si: greater than 0 % and less than 1.0%, Mn: more than 0% and less than 1.0%, Ni: more than 0% and less than 0.5%, Cr: more than 3.0% and less than 8.0%, Mo: more than 2.0% and less than 10.0%, W: more than 0 % and less than 10.0%, V: more than 0% and less than 10.0%, B: more than 0% and less than 0.01%, the balance of Fe and unavoidable impurities.

Description

technical field [0001] The present invention relates to an outer layer material of a rolling composite roll used in hot rolling, and a rolling composite roll using the material as an outer layer. Background technique [0002] In the composite rolling rolls used in hot rolling, the outer layer in contact with the steel plate is required to have excellent wear resistance, surface roughness resistance, and crack resistance. Therefore, a high-speed steel-based cast iron material is used as an outer layer material constituting the outer layer of the roll (for example, refer to Patent Document 1). [0003] In recent years, in consideration of productivity improvement, the rolling pitch has become shorter, and the thermal load on the roll outer layer surface has increased. Moreover, the rolled steel sheet becomes thin and hard, and the wear of the outer layer of the roll increases. [0004] Due to repeated exposure to high temperature of about 1000°C and water cooling of about 30...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/00B21B27/00B22D13/00
CPCB22D13/00B21B27/00C22C37/06C22C37/08C22C37/10C22C38/02C22C38/04C22C38/44C22C38/46C22C38/48C22C38/52C22C38/54B22D13/02C21D1/18C21D1/613C21D1/62C21D9/38C22C38/50C22C38/56B21B2203/18B21B1/22B21B27/005B21B2001/225H05B6/24
Inventor 辻本丰大段刚木村广之
Owner KUBOTA CORP
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