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Forming method of 21-6-9 austenitic stainless steel forge piece

A technology of austenitic stainless steel and forming method, which is applied in the field of forging hot working, can solve the problems of sensitive hot working parameters and no hot working references, and achieves the effect of excellent performance and uniform structure

Pending Publication Date: 2022-03-11
SHAANXI HONGYUAN AVIATION FORGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since 21-6-9 stainless steel forgings are sensitive to thermal processing parameters and have high requirements on its internal structure and performance, but there are no references on thermal processing in China at present, in order to successfully prepare 21 with uniform structure and excellent performance -6-9 forgings, need to explore a set of forming methods

Method used

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  • Forming method of 21-6-9 austenitic stainless steel forge piece
  • Forming method of 21-6-9 austenitic stainless steel forge piece
  • Forming method of 21-6-9 austenitic stainless steel forge piece

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Embodiment

[0032] 21-6-9 stainless steel tee pipe joint, the forging is required to be formed by die forging process. Adopt the die forging method of the present invention, which is bar stock → flattening + pre-forging 1 fire → final forging 1 fire.

[0033] Cutting process:

[0034] Bar specifications: Φ57×120±1mm, both ends of the bar are chamfered, and the end faces are flat, steel grit shot blasting, to ensure that the surface of the bar is free of scale, black spots and other pollutants.

[0035] Pre-forging process:

[0036] Forging heating temperature: 1130±10°C, holding time: 30-35min, mold temperature: 200-250°C. Forging deformation: ~ 50%, transfer time ≤ 10s, cooling method: air cooling, heating furnace with argon protection during heating, argon flow 40 ~ 50m 3 / h.

[0037] The bar is first flattened to 35±1mm, and then directly pre-forged, with an underpressure of 3.5mm, and completed in 1 fire.

[0038] Final forging process:

[0039] Forging heating temperature: 1130...

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Abstract

The invention belongs to the field of forging hot working, and relates to a forming method of a 21-6-9 austenitic stainless steel forge piece. The method comprises the following steps of: pre-forging; the forging heating temperature is 1130 + / -10 DEG C, the heat preservation time is 0.5-0.8 mm / min, and the mold temperature is 200-300 DEG C; the forging deformation is 40%-60%, the transfer time is smaller than or equal to 10 s, the cooling mode is air cooling, argon is introduced into a heating furnace for protection during heating, and the argon flow is 40-50 m < 3 > / h.

Description

technical field [0001] The invention belongs to the field of forging thermal processing, and relates to a forming method of a 21-6-9 austenitic stainless steel forging. Background technique [0002] 21-6-9 is a foreign austenitic stainless steel. Due to its excellent comprehensive performance, it has been widely used in aviation, aerospace and other fields. Elbows and 45° oblique elbows. At present, domestic civil aircraft purchase finished products from abroad. Now, with the changes in the international situation, it is decided to fully localize to meet the needs of the domestic civil aircraft market. [0003] Since 21-6-9 stainless steel forgings are sensitive to thermal processing parameters and have high requirements on its internal structure and performance, but there are no references on thermal processing in China at present, in order to successfully prepare 21 with uniform structure and excellent performance -For 6-9 forgings, we need to find out a set of forming me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/02B21K29/00C21D1/26B21K1/16
CPCB21J5/02B21K29/00C21D1/26B21K1/16C21D2211/001
Inventor 冯德文郝宏斌何力李元葛文俊
Owner SHAANXI HONGYUAN AVIATION FORGING