Anti-scratching mandrel material

An anti-scratch and mandrel technology, which is applied in the field of mandrel materials with improved impact resistance and anti-scratch mandrel materials, can solve the problems of mandrel scratches, scratches and scrapping, etc., to reduce element content and reduce carbonization Effect of improving object size and impact performance

Inactive Publication Date: 2014-01-22
WUXI YOUSIWEIKE PETROLEUM DRILLING TOOLS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the use of mandrels by some manufacturers, due to poor adjustment of the rolling mill, the mandrels are often scratched, and the mandrels are scratched and scrapped before fatigue cracks occur.

Method used

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  • Anti-scratching mandrel material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] An anti-scratch mandrel material, the formula ratio is as follows by weight percentage: C 0.28%, Si 0.4%, Mn 0.2%, S≤0.003%, P≤0.012%, Cr 4%, Mo: 1.1%, V 0.6 %, Ni 0.2%, and the rest is Fe.

[0021] The preparation method of the anti-scratch mandrel material is as follows:

[0022] (1) Electric furnace smelting: The furnace charge is composed of steel return, pig iron, carbon steel return and scrap steel.

[0023] (2) Dephosphorization by slagging: add lime at the bottom of the electric furnace before loading the charge to facilitate the formation of molten slag in advance for dephosphorization. After all the charge is melted, add fluorite and lime to create molten slag with good fluidity. Gradually add ore to facilitate dephosphorization. In order to achieve the purpose of dephosphorization, slag flow operation or full slag removal operation can be used. The phosphorus in electric furnace tapping must be less than 0.005% to ensure that the finished product phosphorus ...

Embodiment 2

[0034] An anti-scratch mandrel material, the formula ratio is as follows by weight percentage: C 0.35%, Si 0.8%, Mn 0.6%, S≤0.003%, P≤0.012%, Cr 5%, Mo: 1.3%, V 0.8 %, Ni 0.5%, and the rest is Fe.

[0035] The preparation method of the anti-scratch mandrel material is as follows:

[0036] (1) Electric furnace smelting: The furnace charge is composed of steel return, pig iron, carbon steel return and scrap steel.

[0037] (2) Dephosphorization by slagging: add lime at the bottom of the electric furnace before loading the charge to facilitate the formation of molten slag in advance for dephosphorization. After all the charge is melted, add fluorite and lime to create molten slag with good fluidity. Gradually add ore to facilitate dephosphorization. In order to achieve the purpose of dephosphorization, slag flow operation or full slag removal operation can be used. The phosphorus in electric furnace tapping must be less than 0.005% to ensure that the finished product phosphorus ...

Embodiment 3

[0048] An anti-scratch mandrel material, the formula ratio is as follows by weight percentage: C 0.32%, Si 0.6%, Mn 0.4%, S≤0.003%, P≤0.012%, Cr 4.5%, Mo: 1.2%, V 0.7%, Ni 0.4%, and the rest is Fe.

[0049] The preparation method of the anti-scratch mandrel material is as follows:

[0050] (1) Electric furnace smelting: The furnace charge is composed of steel return, pig iron, carbon steel return and scrap steel.

[0051] (2) Dephosphorization by slagging: add lime at the bottom of the electric furnace before loading the charge to facilitate the formation of molten slag in advance for dephosphorization. After all the charge is melted, add fluorite and lime to create molten slag with good fluidity. Gradually add ore to facilitate dephosphorization. In order to achieve the purpose of dephosphorization, slag flow operation or full slag removal operation can be used. The phosphorus in electric furnace tapping must be less than 0.005% to ensure that the finished product phosphorus...

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Abstract

The invention belongs to the technical field of metal materials, and relates to an anti-scratching mandrel material, in particular to a mandrel material with high impact resistance. The mandrel material consists of the following components in percentage by weight: 0.28 to 0.35 percent of C, 0.4 to 0.8 percent of Si, 0.2 to 0.6 percent of Mn, less than or equal to 0.003 percent of S, less than or equal to 0.012 percent of P, 4 to 5 percent of Cr, 1.1 to 1.3 percent of Mo, 0.6 to 0.8 percent of V, 0.2 to 0.5 percent of Ni and the balance of Fe. According to the mandrel material, the components are regulated in a way that the content of the components capable of reducing the impact toughness is reduced and the content of the components capable of improving the impact toughness is increased, so that the impact resistance of the material is greatly improved; for example, the C content, the Cr content and the V content are reduced, and the Ni content is increased; the components are regulated in such a way, so that the carbide content of steel and the size of formed carbide are reduced, the nick sensitivity of a metal material to impact force is reduced, and an impact toughness index is improved.

Description

technical field [0001] The invention relates to a scratch-resistant mandrel material, in particular to a mandrel material with improved impact resistance, belonging to the technical field of metal materials. Background technique [0002] The mandrel is a precision mold used to produce seamless steel pipes, and the use process is mainly due to cold and heat fatigue, friction and scratches. In the process of using mandrels in some manufacturers, due to poor adjustment of the rolling mill, the mandrels are often scratched, and the mandrels are scratched and scrapped before fatigue cracks occur. Contents of the invention [0003] The object of the present invention is to overcome the above disadvantages and provide a mandrel material with improved impact toughness. [0004] According to the technical solution provided by the present invention, a kind of anti-scratch mandrel material, the formula ratio is as follows by weight percentage: C 0.28%-0.35%, Si 0.4%-0.8%, Mn 0.2%-0....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/46B23P15/00
Inventor 肖瑞勇
Owner WUXI YOUSIWEIKE PETROLEUM DRILLING TOOLS
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