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Roller making by centrifugal casting

A technology of centrifugal casting and rolling, applied in the direction of rolling, metal rolling, manufacturing tools, etc., can solve the problem of insufficient rolling, and achieve the effect of improving productivity, superior performance, and improving wear resistance

Inactive Publication Date: 2009-03-18
HITACHI METALS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, with regard to the high wear resistance demanded in recent years, the rolls similar to those of Patent Document 1 and Patent Document 2 still have the problem that they are not sufficient to meet this demand.

Method used

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  • Roller making by centrifugal casting
  • Roller making by centrifugal casting
  • Roller making by centrifugal casting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0040] In the chemical composition (mass %) of the roll material shown in Table 1, each test material of the examples of the present invention No. 1 to 4 and each test material of the comparative examples of No. 21 and No. 22 were heated Melt at 1500-1550°C and pour into a cylindrical mold with a diameter of 90mm and a height of 90mm. After cooling, the ingot is taken out, quenched at 1000-1150°C, and tempered three times at 500-600°C.

[0041] Figure 1 shows the heat treatment cycle. The boron carbide existing in the structure of the present invention is mainly precipitated during heat treatment, and a part is crystallized during casting.

[0042] [Table 1]

[0043]

[0044] A test piece was selected from these test materials, and the area % of MC carbide and the area % of boron carbide were measured using an image analysis device (SPICCA-II, manufactured by Abionix Co., Ltd., Japan).

[0045] In addition, the wear amount and surface roughness after rolling were measured ...

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Abstract

The invention aims to provide a roller which is manufactured by centrifugal casting through separating out hard boron carbide from a substrate of a metallic structure and has superior abrasion resistance. The chemical compositions in weight percentage on an outer layer of the roller manufactured by the centrifugal casting are 1.0 to 3.0 percent of carbon, 0.3 to 3.0 percent of silicon, 0.3 to 1.5 percent of manganese, 0.1 to 2.0 percent of nickel, 3.0 to 10.0 percent of chromium, 0.1 to 8.0 percent of molybdenum, 3.0 to 12.0 percent of vanadium, 0.01 to 0.5 percent of boron, and the balance being iron and impurity elements. The metallic structure of the roller contains 5 to 15 area percent of granular MC carbide. The roller which is manufactured by the centrifugal casting is characterized in that the substrate of the metallic structure contains 0.1 to 2.0 percent of boron carbide according to the area percent.

Description

technical field [0001] The present invention relates to a centrifugally cast roll excellent in wear resistance. In particular, it relates to a centrifugally cast roll suitable as a workpiece roll used in a finishing train of a hot thin plate mill. Background technique [0002] As the roll, a high-speed steel-based material containing alloy elements such as Cr, Mo, W, V, etc. in several % each is used. High-speed steel materials are crystallized or precipitated MC (M refers to metal) as V-type carbides, and M as Mo and W-type carbides. 6 C or M 2 C and other high-hardness carbides increase the total hardness of the Fe matrix and carbides, and use Mo and W to suppress the decrease in matrix hardness at high temperatures. [0003] As such a well-known example, for example, Patent Document 1 discloses a roll outer layer whose chemical composition contains C: 1.0 to 3.0%, Si: 0.1 to 2.0%, Mn: 0.1 to 2.0%, Cr : 3.0 to 10.0%, Mo: 0.1 to 9.0%, W: 1.5 to 10.0%, V, Nb: 3.0 to 10.0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/54B21B27/00
Inventor 大畑拓己
Owner HITACHI METALS LTD