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Roll outer material for rolling and composite roll for rolling

A technology of outer layer materials and composite rolls, applied in the direction of rolls, metal rolling, metal rolling, etc., can solve problems such as segregation, segregation, and easy aggregation

Active Publication Date: 2020-12-18
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cemented carbide formed with the composition of high-speed steel is generally lighter in specific gravity than the base, and is prone to segregation in casting
In particular, in the centrifugal casting method, which is a typical roll outer layer material because of its excellent productivity and economical efficiency, the phase with a light specific gravity tends to gather and segregate inside due to the centrifugal force, so it is difficult to utilize centrifugal casting. Casting method to manufacture high-speed steel roll outer layer material

Method used

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  • Roll outer material for rolling and composite roll for rolling
  • Roll outer material for rolling and composite roll for rolling
  • Roll outer material for rolling and composite roll for rolling

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach 〕

[0127] The rolling roll outer layer material of the present invention is centrifugally cast. The "centrifugally cast rolling roll outer layer material" as used herein refers to a rolling roll outer layer material in a state produced by a centrifugal casting method conventionally used as a rolling roll manufacturing method. The rolling roll outer layer material produced by the centrifugal casting method ("centrifugal casting" rolling roll outer layer material) can be clearly distinguished as a "product" from the rolling roll material manufactured by a conventional manufacturing method other than this, In addition, it is impractical to determine the "centrifugal casting" roll outer layer material with structure and performance, requiring a lot of labor.

[0128] The roll outer layer material for rolling of the present invention is made of a W-Co-based alloy, and has a composition in which the W content decreases radially from the outer peripheral side of the roll to the inner pe...

no. 2 Embodiment approach 〕

[0164] The rolling roll outer layer material of the present invention is centrifugally cast. The "centrifugally cast rolling roll outer layer material" as used herein refers to a rolling roll outer layer material in a state produced by a centrifugal casting method conventionally used as a rolling rolling roll manufacturing method. Rolling roll outer layer materials produced by centrifugal casting ("centrifugal casting" rolling roll outer layer materials) and rolling rolls manufactured by conventional manufacturing methods other than this method can be classified as "products". It is impractical to make a clear distinction between different forms, and to determine the outer layer material of the "centrifugal casting" rolling roll with structure and performance, which requires a lot of labor.

[0165] The roll outer layer material for rolling of the present invention is made of a W-Co-based alloy, has a gradient composition in which the W content decreases from the outer periphe...

Embodiment 1

[0210] First, examples in the first embodiment described above will be described.

[0211] The molten metal of the composition shown in Table 1 was melted in a high-frequency induction furnace, and cast into a sleeve-shaped roller outer layer material (outer diameter: Radial wall thickness: 55mm). It should be noted that the casting temperature is 1450-1550°C, and the centrifugal force is 140-220G in multiples of gravity. In some test materials (molten metal No. S), since significant carbide segregation toward the inner surface occurred, it was set to 60G for the purpose of reducing the segregation. After casting, reheat to 1050-1200°C and keep for 10h, then repeat the quenching treatment of cooling to below 100°C and the tempering treatment of cooling after heating and keeping at 400-560°C once or twice. Thereby, the hardness from the outer surface of a test material to the position of 5 mm along the thickness direction was adjusted to about 85-100 HS. It should be noted ...

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Abstract

The present invention provides a roll outer layer material and a rolling composite roll having remarkably improved wear resistance. The material of the outer layer of the roll has a W-Co-based alloy, and the composition is as follows: a gradient composition in which the W content decreases radially from the outer peripheral side to the inner peripheral side, and the surface of the outer layer material at a position corresponding to the maximum diameter when rolling is used , in terms of mass%, containing W: 25-70%, Co: 5-45%, and further containing C: 0.6-3.5%, Si: 0.05-3%, Mn: 0.05-3%, Mo: 1-15% , and the remainder consists of unavoidable impurities. The roll outer layer material is preferably centrifugally cast.

Description

technical field [0001] The first embodiment of the present invention relates to a rolling roll outer layer material suitable for hot rolling or cold rolling and a rolling composite roll using the rolling roll outer layer material, and in particular to improvement of wear resistance . [0002] In addition, the second embodiment of the present invention relates to a rolling roll outer layer material suitable for hot rolling or cold rolling and a rolling composite roll using the rolling roll outer layer material, and particularly relates to wear resistance Improvement and reduction of rolling load. Background technique [0003] [First Embodiment] [0004] First, in the first embodiment, in recent years, the rolling technology of steel sheets has been significantly improved, and accordingly, the use environment of rolling rolls has become more severe. In particular, recently, the production volume of high-strength steel sheets, thin-walled products, and other steel sheets tha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B27/00B22D13/02C22C27/04C22C30/00C22F1/00C22F1/18
CPCB22D13/02C22C27/04C22C30/00C22F1/00C22F1/18B22D13/023C22C19/07B21B27/03B21B27/00C22C29/08
Inventor 市野健司铃木健史岩田直道持田哲男石田清仁大沼郁雄
Owner JFE STEEL CORP
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