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Anti-hydrogen embrittlement, high-strength stainless steel bar for fasteners and method of manufacturing the same

A technology of tough stainless steel and stainless steel rods, which is applied in the field of metal material preparation, can solve the problems of plasticity and toughness decline, and achieve the effect of improving the performance of hydrogen embrittlement resistance, easy metallurgy level, and meeting the requirements of corrosion resistance

Active Publication Date: 2021-08-03
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the strength of the material increases, its plasticity and toughness decrease

Method used

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  • Anti-hydrogen embrittlement, high-strength stainless steel bar for fasteners and method of manufacturing the same
  • Anti-hydrogen embrittlement, high-strength stainless steel bar for fasteners and method of manufacturing the same
  • Anti-hydrogen embrittlement, high-strength stainless steel bar for fasteners and method of manufacturing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] A 6-ton vacuum induction furnace is used to smelt the steel of the invention after iron washing in the forehearth. A 6-ton vacuum consumable remelting furnace is used for refining, and the vacuum degree of the vacuum induction furnace and the vacuum consumable remelting furnace is 0.01Pa. The chemical composition of the head and tail of the consumable ingot was analyzed, see Table 1.

[0062] After the consumable ingot is homogenized at 1200°C for 24 hours, the billet is opened to 140 square meters by a 4T electro-hydraulic hammer, and the billet is opened by a 750KG air hammer to 55 square meters. Rolled to Φ10mm billet, after softening treatment at 920°C, heat preservation for 40min, and air cooling, one cold drawing with 10% deformation to form Φ9mm, and then annealed at 670°C, heat preservation for 5h, air cooling, and polished to Φ8. 5mm bar. The bar is subjected to high-temperature solution treatment at 950°C×30min, oil cooling, cryogenic treatment at -78°C×13h,...

Embodiment 2

[0064] A 6-ton vacuum induction furnace is used to smelt the steel of the invention after iron washing in the forehearth. A 6-ton vacuum consumable remelting furnace is used for refining. The vacuum degree of vacuum induction furnace and vacuum consumable remelting furnace is 0.1Pa. The chemical composition of the head and tail of the consumable ingot was analyzed, see Table 1.

[0065] After the consumable ingot is homogenized at 1250°C for 24 hours, the billet is opened to 80 square meters by a 4T electro-hydraulic hammer, and the billet is opened by a 750KG air hammer to 59 square meters. Rolled to Φ25mm billet, after softening treatment at 920°C, heat preservation for 2 hours, and air cooling, one-time deformation of cold drawing forming Φ17mm, and then annealing at 670°C, heat preservation for 6 hours, air cooling, and polished into Φ16mm bars. The bar is subjected to high-temperature solution treatment at 900°C×40min, oil cooling, cryogenic treatment at -78°C×13h, retu...

Embodiment 3

[0067] A 6-ton vacuum induction furnace is used to smelt the steel of the invention after iron washing in the forehearth. A 6-ton vacuum consumable remelting furnace is used for refining. The vacuum degree of vacuum induction furnace and vacuum consumable remelting furnace is 0.1Pa. The chemical composition of the head and tail of the consumable ingot was analyzed, see Table 1.

[0068]After the consumable ingot is homogenized at 1150°C for 36 hours, it is opened to 100 square meters by a 4T electro-hydraulic hammer, and the billet is opened by a 750KG air hammer to 55 square meters. Rolled to Φ10mm billet, after softening treatment at 980℃, heat preservation for 40min, and air cooling, cold drawing of Φ7mm for secondary deformation, and then annealing at 690℃, heat preservation for 3h, air cooling, and polished into Φ6.5mm rod material. The rods are subjected to high-temperature solution treatment at 850°C×2h, oil cooling, cryogenic treatment at -85°C×12h, returning to roo...

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Abstract

The invention relates to an anti-hydrogen embrittlement, high-strength and tough stainless steel rod used for fasteners and a manufacturing method thereof, which belongs to the technical field of metal materials and solves the problem of anti-hydrogen embrittlement, high-strength stainless steel rods used in aerospace environments. The toughness and tight matching are not high. A hydrogen embrittlement-resistant, high-strength and tough stainless steel bar used for fasteners, the mass fraction of each element in the stainless steel bar is C: 0.0001-0.01%, Si: 0-0.10%, Mn: 0.01-0.15%, S: 0~0.005%, P: 0~0.015%, Cr: 10.50%~12.50%, Ni: 10.70%~11.50%, Mo: 0.75%~1.25%, Ti: 1.20%~1.70%, Al: 0~0.10% , H≤1.5ppm, the rest is iron and unavoidable impurities. A stainless steel bar with comprehensive properties of high strength, high toughness and hydrogen embrittlement resistance is prepared, which meets the requirements for fasteners used in aerospace environments exposed to corrosive media.

Description

technical field [0001] The invention relates to the field of preparation of metal materials, in particular to a hydrogen embrittlement-resistant, high-strength and tough stainless steel rod used for fasteners and a manufacturing method thereof. Background technique [0002] The fasteners used in the aerospace field require materials to have high strength and corrosion resistance under specific corrosive media. When selecting medium-carbon high-strength alloy steel as aerospace fasteners, the bolt surface galvanizing process is generally used to improve corrosion resistance. However, during the electroplating process, the bolt acts as a cathode, which absorbs positive metal ions in the solution, and at the same time absorbs H ions generated after water ionization; hydrogen ions with a small atomic radius can easily penetrate the metal atomic gap and immerse into the metal. After alloy steel is quenched and tempered, a large number of defects are formed inside the structure, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/50C22C38/06C21D8/06C22C33/04
CPCC21D8/065C21D2211/004C21D2211/008C22C33/04C22C38/004C22C38/02C22C38/04C22C38/06C22C38/44C22C38/50
Inventor 宋志刚丰涵郑文杰朱玉亮何建国
Owner CENT IRON & STEEL RES INST
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