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High-alloy steel pipe piercing plugand manufacturing method thereof

A technology of perforated plugs and alloy steel pipes, applied in metal rolling, manufacturing tools, metal rolling, etc., can solve problems such as easy peeling off of oxide film, sticking steel, melting loss, etc., to avoid flat nose and deformation, and low alloy cost , the effect of reducing production costs

Inactive Publication Date: 2015-10-21
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The oxide film on the surface of the perforated plug is easy to fall off, especially the tapered part of the perforated plug is easy to cause steel sticking and melting loss due to the peeling off of the oxide film

Method used

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  • High-alloy steel pipe piercing plugand manufacturing method thereof
  • High-alloy steel pipe piercing plugand manufacturing method thereof
  • High-alloy steel pipe piercing plugand manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0078] figure 2 A further magnification shows, in one embodiment, the screw channel structure of the perforated plug.

[0079] Such as figure 2 As shown, the tooth shape 13 of the screw track 12 is a trapezoidal tooth. Preferably, the pitch P of the screw track is set to 1.5-2.5 mm, the tooth profile angle Y is set to 25-35°, and the tooth bottom width W is set to 1.0-2.0 mm, the tooth top width D is set to 0.3-1.0mm, and the tooth height H is set to 1.0-2.0mm.

[0080] Please refer to Table 2 for specific process parameters in each step involved in the above-mentioned manufacturing method, and refer to Table 3 for details about the relevant parameters of the oxide film on the surface of the perforated plug.

[0081] Table 1 lists the mass percent content of each chemical element in the perforated plugs of Examples A1-A6 and Comparative Examples B1-B4.

[0082] Table 1. (wt.%, the balance is Fe and other unavoidable impurities)

[0083] serial number

C

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Abstract

The invention discloses a high-alloy steel pipe piercing plug. The high-alloy steel pipe piercing plug comprises the following chemical elements in percentage by mass: 0.25-0.35% of C, 0.35-1.5% of Si, 0.35-1.0% of Mn, 1.0-3.0% of Cr, 2.0-3.0% of Mo, 1.0-2.0% of Ni, 1.5-2.5% of W, 0.2-1.0% of V, and the balance of Fe and inevitable impurities; the surface of the high-alloy steel pipe piercing plug has an oxide film; and the outer surface of the high-alloy steel pipe piercing plug has a screw way. The invention further discloses a manufacturing method of the piercing plug; and the manufacturing method comprises the step of: manufacturing of a plug blank; annealing; machining of the steel pipe piercing plug and machining of the screw way on the surface of the plug; and formation of the oxide film through the surface high-temperature oxidation treatment. The piercing plug is higher in high-temperature strength and better in toughness. The oxide film on the surface of the piercing plug is excellent in adhesive force.

Description

technical field [0001] The invention relates to a metal perforating tool, in particular to a steel pipe perforating tool. Background technique [0002] In the hot rolling production of seamless steel pipes, the piercing plug is one of the important tools consumed in large quantities. During the steel pipe piercing process, the plug bears great axial stress and radial stress. Due to the joint action of high temperature and friction, the plug is easily damaged, resulting in damage to the inner surface of the steel pipe billet. Therefore, improving the life of the plug is to ensure the quality of the steel pipe. and key factors in production efficiency. [0003] Compared with carbon steel, high-alloy steel (for example, stainless steel) has greater thermal deformation resistance when the tube blank is pierced, so the rolling load applied to the plug during rolling by the high-alloy steel tube blank is greater than that of the carbon steel tube blank; At the same time, the the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/46C23C8/18B21B25/00B23P15/00
Inventor 陆明和谢麒麟柏广杰王起江
Owner BAOSHAN IRON & STEEL CO LTD
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