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Preparation method of low-nickel high-nitrogen austenitic stainless steel product

A high-nitrogen austenite and stainless steel technology, applied in the field of stainless steel manufacturing, can solve the problems of poor forming, uneven nitrogen distribution, high equipment requirements, etc., and achieve the effects of reducing oxides, low degreasing temperature, and reducing production costs

Inactive Publication Date: 2014-04-09
WEIFANG UNIVERSITY
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing nickel-saving high-nitrogen austenitic stainless steel products, aiming to solve the problems of high equipment requirements, uneven nitrogen distribution, and poor forming in the existing nickel-saving high-nitrogen stainless steel preparation methods

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  • Preparation method of low-nickel high-nitrogen austenitic stainless steel product
  • Preparation method of low-nickel high-nitrogen austenitic stainless steel product
  • Preparation method of low-nickel high-nitrogen austenitic stainless steel product

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Embodiment

[0032] A method for preparing a nickel-saving high-nitrogen austenitic stainless steel product, comprising the following steps:

[0033] (1) Preparation of high-nitrogen nickel stainless steel spherical powder by stirring ball milling

[0034] Select (66-72) parts by mass iron powder, (16-18) parts by mass chromium powder, (10-12) parts by mass manganese powder, (2.0-3.5) parts by mass molybdenum powder with a particle size of 200 mesh and a purity of ≥99.0%. As a raw material, add (0.1-0.3) parts by mass of 200-mesh graphite powder as a lubricant and a deoxidizing reducing agent. After mixing all the powders evenly, place them together with the balls in the ball mill barrel of a high-energy stirring ball mill. Ball milling under pure nitrogen atmosphere for 12-72 hours, the volume of the ball cylinder is 10L, the grinding balls are Φ7-Φ9mm bearing steel balls, the rotation speed is 400-500r / min, the ball-to-material ratio is 10:1-14:1, and the nitrogen flow rate is 1.0 ~1.5L...

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Abstract

The invention provides a preparation method of a low-nickel high-nitrogen austenitic stainless steel product. The method comprises the steps of mixing 200-mesh iron powder, chromium powder, manganese powder and manganese powder as raw materials, with the purity of not less than 99.0%, and 200-mesh graphite powder according to the mass ratio of (66-72): (16-18): (10-12): (2.0-3.5): (0.1-0.3), grinding the above powder in a nitrogen environment, mixing with an adhesive, and then performing mixing and injection molding, catalytic debinding, residual adhesive desorption, sintering densification and sintering densification to obtain the low-nickel high-nitrogen austenitic stainless steel product. The low-nickel high-nitrogen austenitic stainless steel product provided by the invention has the characteristics of higher sintered density, nitrogen content and dimensional precision, excellent mechanical property and decay resistance and the like, thereby being suitable for large-scale industrial manufacturing.

Description

technical field [0001] The invention belongs to the technical field of stainless steel manufacturing, and in particular relates to a method for preparing a nickel-saving high-nitrogen austenitic stainless steel product. Background technique [0002] At present, the preparation methods of nickel-saving high-nitrogen stainless steel mainly include high-pressure melting method and powder metallurgy method. High-pressure smelting includes hot isostatic smelting, pressurized induction smelting, pressurized plasma smelting, and pressurized electroslag remelting. Although high nitrogen content and high toughness can be obtained, the required equipment is complicated, the investment is huge, and the process control More difficult, hindering their industrial development and application. Compared with high-pressure smelting, the production of high-nitrogen steel by powder metallurgy has many advantages, such as simple equipment, low cost, fine-grain strengthening, dispersion strength...

Claims

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Application Information

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IPC IPC(8): B22F3/115B22F1/00
Inventor 崔大伟王金龙姜军生刘炳强魏文庆刘均波王伟章
Owner WEIFANG UNIVERSITY
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