Limiting mandrel for mandrel pipe mill and manufacturing method thereof

A technique for limiting mandrels and manufacturing methods, which is applied in metal rolling, manufacturing tools, metal rolling, etc., and can solve problems such as heavy weight, uneven wear of rolls, and uneven wall thickness on the upper and lower sides of steel pipes.

Inactive Publication Date: 2011-06-15
BAOSTEEL ROLL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] During the seamless steel pipe rolling process, due to the self-weight of the mandrel, the mandrel tends to move downward during the entire rolling process, which leads to uneven wall thickness of the rolled steel pipe, which affects the quality of the finished steel pipe. Due to

Method used

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  • Limiting mandrel for mandrel pipe mill and manufacturing method thereof
  • Limiting mandrel for mandrel pipe mill and manufacturing method thereof
  • Limiting mandrel for mandrel pipe mill and manufacturing method thereof

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Embodiment Construction

[0021] see figure 1 , 2 A stop mandrel for a continuous rolling mill is shown, including a rolling working section 1 and a tail section 2 threaded with the rolling working section 1. The rolling working section 1 consists of a cylindrical base body 1- 1 and a surfacing layer 1-2 fixedly bonded to the outer wall of the cylindrical substrate 1-1 and a chrome-plated layer 1-3 located on the surface of the surfacing layer 1-2; the cylindrical substrate 1-1 Low-alloy steel is used; the material used in the surfacing layer 1-2, its components are calculated by weight percentage, consisting of C 0.30-0.45%, Si 0.7-1.2%, Mn≤0.60%, Cr 4.5-5.5 %, V 0.8~1.2%, Mo 1.0~1.75%, Ni≤0.25%, P≤0.03%, S≤0.03% and the balance Fe.

[0022] In the present invention, the low-alloy steel used for the cylindrical base 1-1 and the material used for the tail section 2 are preferably 42CrMo.

[0023] In the present invention, the manufacturing method of the stopper mandrel for continuous rolling mill in...

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Abstract

The invention discloses a limiting mandrel for a mandrel pipe mill, and the limiting mandrel comprises a milling operating section and a tail section in threaded connection with the milling operating section. The milling operating section comprises a cylindrical substrate, an overlay welding layer fixedly bonded on the outer wall surface of the cylindrical substrate, and a chromium plated layer positioned on the surface of the overlay welding layer, wherein the cylindrical substrate is made of low alloy steel; the overlay welding layer comprises the following components by weight percent: 0.30-0.45% of C, 0.7-1.2% of Si, less than or equal to 0.60% of Mn, 4.5-5.5% of Cr, 0.8-1.2% of V, 1.0-1.75% of Mo, less than or equal to 0.25% of Ni, less than or equal to 0.03% of P, less than or equal to 0.03% of S, and the balance of Fe. The manufacturing method of the limiting mandrel comprises the following steps: fabricating the cylindrical substrate; and carrying out overlay welding, carrying out hot straightening, carrying out rough machining, carrying out finish machining, polishing, carrying out chromium plating, dehydrogenating, and carrying out thread phosphorizing. The limiting mandrel provided by the invention has the advantages of light weight, high strength, long service life and low production cost, is convenient to repair and regenerate, and is suitable for being generalized and used in the metallurgical industry.

Description

technical field [0001] The invention relates to a rolling tool used in a continuous rolling mill for seamless steel pipes, in particular to a stop mandrel used in a continuous rolling mill; the invention also relates to a manufacturing method for the stop mandrel, which belongs to the metallurgical Industry rolling tool manufacturing technology field. Background technique [0002] The stop mandrel is an important rolling tool used in the continuous rolling mill for the production of seamless steel pipes. During the rolling process, the mandrel not only needs to withstand large rolling force and friction, but also needs to withstand frequent cold and heat shocks. Therefore, the mandrel material must not only have sufficient strength and toughness, but also need strong cold resistance. For thermal fatigue performance, the expensive H13 steel is usually used as the mandrel material at home and abroad. [0003] During the seamless steel pipe rolling process, due to the self-we...

Claims

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Application Information

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IPC IPC(8): B21B25/00B23P15/00B23K9/04C22C38/46
Inventor 卢守栋占中杰陈荣伟李陈昊王凯
Owner BAOSTEEL ROLL SCI & TECH
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