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High temperature and high pressure resistant perforated plug and preparation method thereof

A perforated plug and high temperature resistant technology, which is applied in the manufacture of tools, metal rolling, metal rolling, etc., can solve the problems of wear resistance and high temperature resistance, cracking, flat nose and other problems, and achieve excellent heat resistance and improve High temperature and pressure resistance, life-enhancing effects

Active Publication Date: 2022-05-31
宁波文而昌新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The piercing plug plays an extremely important role in the production of steel pipes. It is subject to the combined stresses such as repeated radial compressive stress and tangential shear stress transmitted by the roll through the deformation of the tube blank, and the axial force transmitted by the roll through the tube blank. Compressive stress will cause relative movement on the surface of the plug to generate friction, and the plug is in contact with the high-temperature tube blank. Although there is cooling effect of internal water or external water, the plug is subject to the cyclic thermal stress of sudden cooling and sudden heating. The working environment of the plug is very harsh, and failure problems such as nose collapse, sticking to steel, and cracking often occur. The development of high temperature and high pressure resistant perforated plugs has become an important research topic for steel pipe production.
[0003] The patent document (publication number: CN104364414A) discloses a perforated plug and a method for preparing the perforated plug. It prepares the main body of the plug with C, Si, Mn, Cu, and Fe elements, and then forms iron and iron oxides on the surface of the main body. Spray coating to improve the life of the plug, but its wear resistance and high temperature resistance still have problems

Method used

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  • High temperature and high pressure resistant perforated plug and preparation method thereof
  • High temperature and high pressure resistant perforated plug and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] According to the composition elements and mass percentages of perforated plugs described in Table 1, Example 1, the raw materials are prepared, and the raw materials are smelted, refined, poured, processed and formed; the processed and formed plugs are machined, and phosphorus is formed on the surface of the plugs with a phosphating solution. For the chemical film, the mass percentage of the phosphating solution is as follows: 22% phosphoric acid, 6% zinc oxide, 9% manganese nitrate, 10% dodecanol, and the balance is water. Then heat the plug to 910°C for annealing, keep it warm for 2 hours, then take it out of the furnace to cool at 320°C, and perform ZrN coating treatment on the coating machine to obtain the finished perforated plug. The target voltage of the coating machine is 450V, and the target power is 25W / CM 2 , the pulse bias voltage is 180V, the duty cycle is 80%, and the coating time is 25min.

Embodiment 2

[0032] According to the composition elements and mass percentages of perforated plugs described in Table 1, Example 2, the raw materials are prepared, and the raw materials are smelted, refined, poured, processed and formed; the processed and formed plugs are machined, and phosphorus is formed on the surface of the plugs with a phosphating solution. For the chemical film, the mass percentage of the phosphating solution is as follows: 22% phosphoric acid, 6% zinc oxide, 9% manganese nitrate, 10% dodecanol, and the balance is water. Then heat the plug to 910°C for annealing, keep it warm for 2 hours, then take it out of the furnace to cool at 320°C, and perform ZrN coating treatment on the coating machine to obtain the finished perforated plug. The target voltage of the coating machine is 450V, and the target power is 25W / CM 2 , the pulse bias voltage is 180V, the duty cycle is 80%, and the coating time is 25min.

Embodiment 3

[0034] Prepare raw materials according to the composition elements and mass percentages of perforated plugs described in Example 3 in Table 1, smelt, refine, pour, and process the raw materials; machine the processed plugs, and use phosphating solution to form phosphorus on the plug surface For the chemical film, the mass percentage of the phosphating solution is as follows: 22% phosphoric acid, 6% zinc oxide, 9% manganese nitrate, 10% dodecanol, and the balance is water. Then heat the plug to 910°C for annealing, keep it warm for 2 hours, then take it out of the furnace to cool at 320°C, and perform ZrN coating treatment on the coating machine to obtain the finished perforated plug. The target voltage of the coating machine is 450V, and the target power is 25W / CM 2 , the pulse bias voltage is 180V, the duty cycle is 80%, and the coating time is 25min.

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Abstract

The invention belongs to the field of metal materials and relates to a high temperature and high pressure resistant perforated plug and a preparation method thereof. The mass percentage content of a high temperature and high pressure resistant piercing plug of the present invention is: C: 0.40‑0.44%, Cr: 13.8‑14.2%, Mn: 1.8‑2.3%, Mo: 0.3‑0.4%, W: 0.6‑0.7%, and the rest The amount is Fe and unavoidable impurities. By coating the surface of the plug with ZrN film, the plug has excellent heat resistance, wear resistance, oxidation resistance, impact resistance and other properties, so that the overall performance of the plug is greatly improved, and the life of the plug is also improved.

Description

technical field [0001] The invention belongs to the field of metal materials and relates to a high temperature and high pressure resistant perforated plug and a preparation method thereof. Background technique [0002] The piercing plug plays an extremely important role in the production of steel pipes. It is subject to the combined stresses such as repeated radial compressive stress and tangential shear stress transmitted by the roll through the deformation of the tube blank, and the axial force transmitted by the roll through the tube blank. Compressive stress will cause relative movement on the surface of the plug to generate friction, and the plug is in contact with the high-temperature tube blank. Although there is cooling effect of internal water or external water, the plug is subject to the cyclic thermal stress of sudden cooling and sudden heating. The working environment of the plug is very harsh, and failure problems such as nose collapse, sticking to steel, and cr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/38C22C38/22C21D1/26C23C14/06C23C22/18B21B25/00
CPCC22C38/38C22C38/22C21D1/26C23C14/0641C23C22/182B21B25/00Y02E30/30
Inventor 吴满旵
Owner 宁波文而昌新材料科技有限公司
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