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Ultralow-carbon low-cobalt martensitic steel and preparation method thereof

A technology of carbon and low cobalt martensitic steel and martensitic steel, which is applied in the field of powder metallurgy technology preparation, can solve the problems of low density, tensile strength and elongation, affect the precipitation of precipitates, and increase the C content of materials, etc. Short time, the effect of reducing the grain size of the material and refining the grain

Pending Publication Date: 2022-05-13
湖南英捷高科技有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When using injection molding technology to prepare high-strength steel, the density is usually low, and there is often a small amount of binder residue, which increases the C content of the material and affects the precipitation of precipitates. Due to the high sintering temperature, the grains are more dense. Coarse, which leads to the problems of low density, tensile strength and elongation in the high-strength steel for injection molding powder metallurgy in the prior art

Method used

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  • Ultralow-carbon low-cobalt martensitic steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A. Select powder and binder:

[0052] Gas-atomized ultra-low-carbon and low-cobalt martensitic stainless steel powder is selected, with an average particle size of 8.6 μm. Its main chemical element percentages are: Ni11.2%, Mo: 10.4%, Co: 6.2%, Ti: 2.0%, Al: 1.6%, Nb: 0.28%, Fe: balance.

[0053] Preparation of binder: by mass percentage: PE wax (average molecular weight 2000-5000): 23%, microcrystalline paraffin wax (80# microcrystalline wax): 32%; medium beeswax (acid value 5.0-6.0): 20% , random polypropylene (average molecular weight 100,000-150,000): 13%; dilute ethylene-butadiene-styrene block copolymer (average molecular weight 80,000-100,000): 2%; TPEE (injection molding grade 1047D) : 7%, stearic acid (molecular weight: 284): 3%.

[0054] B. Preparation of feeding material: mixing and granulating the binder and ultra-low carbon and low cobalt martensitic stainless steel powder volume ratio 58%:42% to make feeding material. The mixing temperature is 100°C and ...

Embodiment 2

[0063] A. Select powder and binder:

[0064] Gas-atomized ultra-low-carbon and low-cobalt martensitic stainless steel powder is selected, with an average particle size of 7.6 μm. Its main chemical element percentages are: Ni: 9.2%, Mo: 10.5%, Co: 4.8%, Ti: 1.8%, Al: 1.5%, Nb: 0.38%, Fe: balance.

[0065] Preparation of binder: by mass percentage: PE wax (average molecular weight 2000-5000): 25%, microcrystalline paraffin wax (80# microcrystalline wax): 35%; medium beeswax (acid value 5.0-6.0): 18% , random polypropylene (average molecular weight 100,000-150,000): 11%; dilute ethylene-butadiene-styrene block copolymer (average molecular weight 80,000-100,000): 3%; TPEE (injection molding grade 1047D) : 6%, stearic acid (molecular weight: 284): 2%.

[0066] B. Preparation of feeding material: mixing and granulating the binder and ultra-low carbon and low cobalt martensitic stainless steel powder volume ratio 60%:40% to make feeding material. The mixing temperature is 110°C and...

Embodiment 3

[0075] A. Select powder and binder:

[0076] Gas-atomized ultra-low-carbon and low-cobalt martensitic stainless steel powder is selected, with an average particle size of 9.6 μm. Its main chemical element percentages are: Ni12.2%, Mo: 12.5%, Co: 6.8%, Ti: 2.2%, Al: 1.8%, Nb: 0.41%, Fe: balance.

[0077] Preparation of binder: by mass percentage: PE wax (average molecular weight 2000-5000): 22%, microcrystalline paraffin wax (80# microcrystalline wax): 30%; medium beeswax (acid value 5.0-6.0): 20% , random polypropylene (average molecular weight 100,000-150,000): 15%; dilute ethylene-butadiene-styrene block copolymer (average molecular weight 80,000-100,000): 3%; TPEE (injection molding grade 1047D) : 8%, stearic acid (molecular weight: 284): 2%.

[0078] B. Preparation of feeding material: mixing and granulating the binder and ultra-low carbon and low cobalt martensitic stainless steel powder volume ratio 53%:47% to make feeding material. The mixing temperature is 130°C and ...

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Abstract

The preparation method comprises the following steps that low-cobalt martensitic steel stainless steel powder and a binder are subjected to mixing and granulation, feed is obtained, the feed is injected into a mold, an injection green body is obtained, solvent degreasing is conducted to obtain a dissolvable blank, warm isostatic pressing treatment is conducted to obtain a pressed green body, and the pressed green body is subjected to heat treatment to obtain the ultra-low-carbon low-cobalt martensitic steel with the ultra-low-carbon low-cobalt martensitic steel with the ultra-low-carbon low-cobalt martensitic steel. According to the preparation method, two times of degreasing are adopted, after the injection blank is obtained through injection molding, a solvent is adopted for degreasing to remove part of the binder, and then the ultra-low-carbon and low-cobalt martensitic steel is obtained through sintering in a vacuum environment, so that the ultra-low-carbon and low-cobalt martensitic steel is obtained. According to the ultra-low-carbon low-cobalt martensitic steel and the preparation method thereof, the low-carbon low-cobalt martensitic steel is subjected to temperature isostatic pressing treatment under the set technological parameter condition to obtain a green body, the inventor finds that the density of the green body can be greatly improved, and the ultra-low-carbon low-cobalt martensitic steel has high density, fine grains and excellent mechanical properties.

Description

technical field [0001] The invention relates to an ultra-low-carbon and low-cobalt martensitic steel and a preparation method thereof, belonging to the field of powder metallurgy preparation. Background technique [0002] Maraging steel is widely used in cutting-edge fields such as aviation and aerospace because of its ultra-high strength, high toughness, excellent processing and welding properties. At present, the most widely used maraging steel is cobalt-containing maraging steel, and its strength ranges from 1300-1800MPa. With the increase of strength level, the content of Co, an important strengthening alloy element, is as high as 12%. The production cost of maraging steel is increased due to the scarcity of cobalt, which limits its application and development. Therefore, the most important thing to develop low-cobalt maraging steel is to reduce the cost. [0003] Metal powder injection molding technology is a new type of powder metallurgy near net shape forming techno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/02C22C38/04C22C38/06C22C38/08C22C38/10C22C38/12C22C38/14B22F1/10B22F3/22B22F3/10
CPCC22C33/0285C22C38/08C22C38/12C22C38/10C22C38/14C22C38/06C22C38/04B22F3/225B22F3/1007B22F2999/00B22F2201/20
Inventor 余勇李益民王霄
Owner 湖南英捷高科技有限责任公司
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