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Non-magnetic stainless steel with high strength and toughness, manufacturing method and application thereof

A high-strength, high-toughness, manufacturing method technology, applied in the field of non-magnetic high-strength and high-toughness stainless steel, can solve the problems of high equipment requirements and high production costs, and achieve the effects of enhancing corrosion resistance, satisfying non-magnetic properties, and prolonging service life

Active Publication Date: 2011-05-11
宝武特种冶金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the need for pressurized treatment, this manufacturing method has high requirements for equipment and high production costs

Method used

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  • Non-magnetic stainless steel with high strength and toughness, manufacturing method and application thereof
  • Non-magnetic stainless steel with high strength and toughness, manufacturing method and application thereof
  • Non-magnetic stainless steel with high strength and toughness, manufacturing method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] In this embodiment, the chemical composition mass percentage of steel is: C: 0.036; Si: 0.50; Mn: 19.92; Cr: 13.31; Mo: 0.38; Ni: 0.39; N: 0.40; P: 0.019; The balance is Fe and unavoidable impurities.

[0067] Steel is manufactured as follows:

[0068] Electric furnace smelting: When the melt is about to be cleared, blow oxygen appropriately to boost the melting; the tapping temperature is higher than 1630°C;

[0069] AOD smelting: mixed with rough smelting molten steel, the carbon content is controlled in the range of 0.80-1.2;

[0070] Mix the manganese in the molten steel to 6.0-10.0%. In the oxidation period of AOD smelting, blow nitrogen all the time, and at the same time blow oxygen to decarburize until the carbon content is not higher than 0.03%, enter the reduction period to raise the temperature of molten steel to 1650-1720°C, and continue to blow nitrogen to the nitrogen content after the manganese content is fully prepared Stop blowing nitrogen at about 0....

Embodiment 2

[0075] The chemical composition mass percentage of steel in this embodiment is: C: 0.030; Si: 0.40; Mn: 19.20; Cr: 13.30; Mo: 0.32; Ni: 0.20; N: 0.38; Fe and unavoidable impurities.

[0076] Others are the same as embodiment 1. The mechanical properties and magnetic permeability results of the steel in this example are shown in Table 6.

Embodiment 3

[0078] The chemical composition mass percentage of steel in this embodiment is: C: 0.036; Si: 0.56; Mn: 19.32; Cr: 14.00; Mo: 0.40; Ni: 0.36; N: 0.43; Fe and unavoidable impurities.

[0079] Others are the same as embodiment 1. The mechanical properties and magnetic permeability results of the steel in this example are shown in Table 6.

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Abstract

The invention provides non-magnetic stainless steel with high strength and toughness, a manufacturing method and application thereof. The stainless steel comprises the following chemical components in percentage by weight: less than or equal to 0.04 percent of C, 0.35 to 0.65 percent of Si, 17.00 to 22.00 percent of Mn, 13.00 to 17.00 percent of Cr, 0.30 to 0.50 percent of Mo, 0.15 to 0.45 percent of Ni, 0.30 to 0.80 percent of N, less than or equal to 0.03 percent of P, less than or equal to 0.005 percent of S, and the balance being Fe and inevitable impurities. The steel improves the rust resistance and corrosion resistance of the stainless steel by adopting a low-carbon and high-chromium content design, reduces the nickel content by replacing the nickel with manganese and nitrogen at the same time, and reduces production cost. The steel is smelted by adopting an EAF, AOD and LF method, the forging process is divided into two temperature stages, the steel is treated by adopting different deformation amounts, and the method is simple and convenient to apply and has good effect. The invention also provides application of the stainless steel in a petroleum drill.

Description

technical field [0001] The invention relates to a stainless steel, in particular to a non-magnetic, high-strength and high-toughness stainless steel and a manufacturing method of the stainless steel. Background technique [0002] Recently, the steel used for drilling tools generally requires non-magnetic steel to avoid the impact of the magnetism generated when the drilling tool is working on instruments and meters, and the alloy structural steel used for drilling tools is all magnetic materials. Therefore, oil drilling tools, drill collars and many parts (such as weighted rods, stabilizers, drill pipes, tool connectors, etc.) at home and abroad have gradually begun to adopt high Austenitic stainless steel with high strength, high toughness and good plastic fit. [0003] In the past, steels for oil drilling tools at home and abroad had serious quality problems, such as low strength and low toughness and plasticity. The Charpy impact energy of ordinary oil drilling tools is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/58C22C33/04
Inventor 廖洪军姚长贵赵钧良王敏罗辉孟宪玲张杉顾雄
Owner 宝武特种冶金有限公司
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