Covered carbide plug and cold drawing method using the covered carbide plug

A kind of coating, superhard technology, applied in the direction of coating, superimposed layer plating, metal material coating process, etc., can solve the problems of reduced service life of the plug, scratches, TiCN film peeling, etc., and achieves a long service life. Effect

Active Publication Date: 2010-12-08
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, it is clear that when drawing a Cr-based alloy steel with an oxalate protective film formed on the base of a lubricating protective film, if a superhard plug coated with TiCN is used, the TiCN film will Stripping will occur, resulting in a significant reduction in the service life of the plug
As a result, many scratches are generated on the steel pipe that has been drawn, which unavoidably leads to a decrease in the yield of products and a decrease in the efficiency of drawing.

Method used

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  • Covered carbide plug and cold drawing method using the covered carbide plug
  • Covered carbide plug and cold drawing method using the covered carbide plug
  • Covered carbide plug and cold drawing method using the covered carbide plug

Examples

Experimental program
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Effect test

Embodiment 1

[0044] As the steel pipe for the test of Example 1, the steel type is JIS STBA26 (9Cr-1Mo steel), and the pipe which was finish-rolled by the Manesmann mandrel rolling method was prepared. In order to carry out the tube softening treatment on the received tube blank, the tube blank was subjected to a heat treatment at 800°C for 10 minutes in a roller hearth furnace, and then the tube blank was removed by pickling treatment on the inner and outer surfaces of the tube blank. Scale, after which lubrication treatment was implemented.

[0045] As a specific chemical conversion treatment before the drawing process, use sulfuric acid (10-13%) to carry out pickling treatment at room temperature and for 30 minutes, then perform water washing treatment, neutralization treatment, and then perform treatment at a temperature of The state of 75-85 °C, the treatment time is 5 minutes of oxalate protective film treatment, the sodium stearate is reacted with the oxalate protective film under t...

Embodiment 2

[0053] As a steel pipe for a test in Example 2, a steel grade corresponding to JISSUS 304 stainless steel and a pipe finish-rolled by the Manesmann mandrel rolling method were prepared. The received tube blanks were heat treated at 1230° C. for 2 minutes in a roller hearth furnace, then lubricated by chemical conversion treatment after descaling by pickling treatment.

[0054] As the drawing process, the size of the tube blank is set to an outer diameter of 54.0 mm x wall thickness of 7.9 mm, and the drawing size is set to an outer diameter of 44.50 mm x wall thickness of 6.30 mm, and the reduction rate of the section shown in the above formula (1) is Rd is set at 33.9%.

[0055] Identical to embodiment 1, use superhard mold as mould, the band coating superhard plug (comparative example) of the band coating superhard plug (comparative example) of the band coating superhard plug (comparative example) that is divided into TiAlN film and TiCN film for drawing with the plug divisi...

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Abstract

In cold drawing an original pipe of a Cr-base alloy steel containing not less than 5% by mass of Cr, when an original pipe with an oxalate film formed as a substrate for a lubricating film formed by conversion treatment is used while a covered carbide plug having a surface coated with titanium aluminum nitride (TiAlN) film is used as a drawing plug, the separation of the TiAlN film coated on the plug surface can be suppressed. Thus, the occurrence of seizure marks can be prevented, and the service life of the plug can be prolonged.

Description

technical field [0001] The invention relates to a coated superhard plug (plug) suitable for processing Cr-based alloy steel and a cold drawing method. The coated superhard plug with excellent scratch resistance and wear resistance and the cold drawing method using the coated superhard plug. Background technique [0002] Cold drawing is used in the finishing of steel pipes that are used in piping for nuclear reactors, high-temperature and high-pressure furnaces, and that require high dimensional accuracy. In the case of applying this cold drawing process, one end of the billet is rolled to be thinner to form a constricted portion, and then the billet is pickled and then lubricated, and the shrinkage is clamped by the chuck of the cold drawing machine. The neck is drawn along with the movement of the carriage (carriage), so that the tube blank is drawn to the target size. [0003] figure 1 It is a figure explaining roughly the method of performing diameter reduction process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C3/16C23C22/46C23C28/00
CPCF28F2245/00C23C28/023B21C3/16C23C28/04F28F21/08B21C1/24
Inventor 内田和宏神田修
Owner NIPPON STEEL CORP
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