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High-hardness 316L stainless steel as well as preparation method and application thereof

A stainless steel, high-hardness technology, applied in the field of stainless steel, austenitic stainless steel, can solve problems such as unsatisfactory demand

Active Publication Date: 2021-07-13
HUNAN HENGJI POWDER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: the hardness of ordinary injection-molded 316L stainless steel is 140-180Hv, and the conventional method for increasing the hardness has defects, which cannot meet the current demand for 316L parts with a hardness above 200Hv.

Method used

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  • High-hardness 316L stainless steel as well as preparation method and application thereof
  • High-hardness 316L stainless steel as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] 316L stainless steel parts were made by injection molding. Specific process: 1.5% Nb pre-alloyed 316L stainless steel powder is prepared by mixing raw materials, which is composed of 17% Cr, 12% Ni, 2% Mo, 1.5% Nb, and the balance Fe. Mixed with 0.08% graphite powder. The powder is composed of graphite powder with an average particle size of 6-9 microns and Nb-containing pre-alloyed 316L stainless steel powder with an average particle size of 4-10 microns. Use paraffin wax and high-density polyethylene as the binder, mix the powder according to the volume ratio: binder = 6:4 (volume ratio); obtain the molded body through the injection molding process, and remove the organic binder through solvent degreasing and thermal degreasing . After the degreasing is completed, continue to raise the temperature for sintering in a nitrogen atmosphere (nitrogen partial pressure 80kPa), at a heating rate of 5°C / min, and keep the temperature at 1300°C for 2 hours. After the sample i...

Embodiment 2

[0032] 316L stainless steel parts were made by injection molding. Specific process: 2% Nb pre-alloyed 316L stainless steel powder is prepared by mixing raw materials, consisting of 17% Cr, 12% Ni, 2% Mo, 2% Nb, and the balance Fe. Mixed with 0.12% graphite powder. The powder is composed of graphite powder with an average particle size of 6-9 microns and Nb-containing pre-alloyed 316L stainless steel powder with an average particle size of 4-10 microns. Paraffin wax and high-density polyethylene are used as binders, according to the volume ratio, mixed powder: binder = 6:4 (volume ratio); mix the mixed powder and binder evenly to obtain feed, and inject the feed into the mold In the green body, the green body is obtained; the organic binder is removed by solvent degreasing and thermal degreasing. After the degreasing is completed, continue to raise the temperature to carry out sintering in a nitrogen atmosphere (nitrogen partial pressure 90kpa), the temperature rise rate is 5...

Embodiment 3

[0034] 316L stainless steel parts were made by injection molding. Specific process: 3% Nb pre-alloyed 316L stainless steel powder is prepared by mixing raw materials, consisting of 17% Cr, 12% Ni, 2% Mo, 3% Nb, and the balance Fe, mixed with 0.18% graphite powder. The powder is composed of graphite powder with an average particle size of 6-9 microns and Nb-containing pre-alloyed 316L stainless steel powder with an average particle size of 4-10 microns. Paraffin wax and high-density polyethylene are used as binders, according to the volume ratio, mixed powder: binder = 6:4 (volume ratio); mix the mixed powder and binder evenly to obtain feed, and inject the feed into the mold In the green body, the green body is obtained; the organic binder is removed by solvent degreasing and thermal degreasing. After the degreasing is completed, continue to raise the temperature and carry out sintering in a nitrogen atmosphere (nitrogen partial pressure 100kpa), at a heating rate of 5°C / min,...

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Abstract

The invention belongs to the field of stainless steel, relates to austenitic stainless steel, and particularly relates to high-hardness 316L stainless steel and a preparation method thereof. The high-hardness 316L stainless steel is prepared from the following components in percentage by mass: 17 to 18 percent of Cr, 12 to 14 percent of Ni, 2 to 3 percent of Mo, 1.5 to 3 percent of Nb, 0.075 to 0.185 percent of C, 0.08 to 0.12 percent of N and the balance of Fe. The high-hardness 316L stainless steel provided by the invention is prepared by the following steps of: taking pre-alloyed 316L stainless steel powder containing 1.5 to 3 wt% of Nb as a raw material, uniformly mixing the raw material with 0.08 to 0.2 wt% of graphite powder, forming and sintering to obtain the high-hardness 316L stainless steel, wherein atmosphere adopted for sintering contains nitrogen, and the partial pressure of the nitrogen is 80 to 100 kPa; and during sintering, a sintering temperature is controlled to be 1280 to 1300 DEG C. The high-hardness 316L stainless steel provided by the invention has a reasonable component design, is simple and controllable in a preparation process, and provides a new direction for application of low-cost and high-performance austenitic stainless steel parts.

Description

technical field [0001] The invention belongs to the category of stainless steel, relates to an austenitic stainless steel, and specifically relates to a high-hardness 316L stainless steel and its preparation method and application. Background technique [0002] 316L is currently one of the most widely used austenitic stainless steels. Due to its excellent corrosion resistance, good comprehensive mechanical properties, excellent manufacturability and weldability, it is widely used in aviation, aerospace, petroleum, chemical, Medicine, transportation, electronics and other fields. Stainless steel prepared by powder injection molding has good mechanical, physical and chemical properties. Compared with stainless steel manufactured by traditional technology, the production is close to net shape, with high material utilization rate and uniform structure. With the rapid development of injection molding of micro parts and high-precision parts, the performance of ordinary 316L stain...

Claims

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Application Information

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IPC IPC(8): C22C38/44C22C38/48C22C33/02
CPCC22C38/44C22C38/48C22C38/001C22C33/0285C22C33/0207
Inventor 吴楚何浩文涛沈红仁寻裕平
Owner HUNAN HENGJI POWDER TECH
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