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Plug for rolling seamless steel pipe, method for manufacturing said plug, and method for manufacturing seamless steel pipe in which said plug is used

A technology of seamless steel pipe and manufacturing method, which is applied in the direction of manufacturing tools, metal rolling, metal rolling, etc., can solve the problems of insufficient high-temperature strength, insufficient service life of the plug, and damage of the front end, etc., and achieve the effect of cost reduction

Active Publication Date: 2015-05-13
JFE STEEL CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The reason why the life of the plug is not sufficient when rolling high-alloy steel containing 12% by mass or more of Cr in the rolling material is as follows: the material being rolled has high strength at high temperature, and the plug made of iron-base alloy (iron-base alloy) has high strength. The high-temperature strength of the plug is relatively insufficient. Even if the oxide skin is used to protect the surface, the front end of the plug will be damaged (crush) and deformed (gouge) due to contact load. The surface oxide skin layer is destroyed, with burns, etc.

Method used

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  • Plug for rolling seamless steel pipe, method for manufacturing said plug, and method for manufacturing seamless steel pipe in which said plug is used
  • Plug for rolling seamless steel pipe, method for manufacturing said plug, and method for manufacturing seamless steel pipe in which said plug is used
  • Plug for rolling seamless steel pipe, method for manufacturing said plug, and method for manufacturing seamless steel pipe in which said plug is used

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Embodiment

[0053] The technology of the present invention adopts the seamless steel pipe used in the factory figure 2 Dimensions shown for shape of plug.

[0054] In the examples, as the material constituting the plug of the present invention, a low-alloy material containing C: 0.2%, Si: 0.5%, Mn: 1.0%, Cr: 0.8%, Mo: 2.0%, and Nb: 0.1% was used in mass %. alloy steel.

[0055] In the prior art, heat treatment is performed on the plug to form an oxide layer composed of iron-based oxides on the surface.

[0056] A surface photograph of a plug having an iron-based oxide layer formed on its surface by heat treatment suitable for the plug material (heating at 1050°C in the atmosphere and holding for 6 hours) is shown in image 3 . In addition, the microstructure of the cross-section of the iron-based oxide layer is schematically shown in Figure 5 .

[0057] In Example A of the present invention, the plating of Co-0.1 mass % Ni (called pure Co) is implemented on the surface of the iron-...

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Abstract

Provided is a technique for significantly increasing the life of a plug used under severe conditions such as rolling of a seamless high-alloy steel pipe. Specifically, a plug for rolling of a seamless steel pipe, the plug having an oxide layer composed of a cobalt-base oxide on a surface of a coating layer formed by coating a surface of a base metal with cobalt or a cobalt-base alloy, a method for manufacturing the plug and a method for manufacturing a seamless steel pipe using the plug.

Description

technical field [0001] The present invention relates to a plug for rolling of seamless steel pipe as a hot rolling tool, a method for manufacturing the plug, and a method for manufacturing a seamless steel pipe using the plug. Background technique [0002] As a method for producing seamless steel pipes at high temperatures, the Mannesmann mill process has been widely practiced conventionally. The method is to first use a piercing mill to perforate and roll a round shape steel (hereinafter referred to as a billet) heated to a specified temperature to produce a hollow tube. Pieces or hollow steel tubes) (hereinafter referred to as hollow tubes), using main rolling mills such as elongator, plug mill or mandrel mill The wall thickness of the hollow tube is reduced, and after further reheating as required, the outer diameter is mainly reduced by a reducing mill or a sizing mill to obtain a seamless steel tube of a specified size Methods. [0003] There are various kinds of pie...

Claims

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Application Information

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IPC IPC(8): B21B25/00C23C8/12C23C28/00
CPCB21B25/00C23C8/02C23C8/12B21B19/04C25D5/50C25D7/00B21B28/00
Inventor 井口贵朗胜村龙郎木村秀途
Owner JFE STEEL CORP
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