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Forging and heat treatment method of 9Cr18MoV steel forging

A heat treatment method, 9cr18mov technology, applied in the field of forging and heat treatment of 9Cr18MoV steel forgings, can solve the problems affecting the corrosion resistance of 9Cr18MoV steel, carburizing, nitriding and hydrogen permeating, carbide precipitation, etc.

Inactive Publication Date: 2014-10-15
GUIZHOU ANDA AVIATION FORGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] When 9Cr18MoV steel is forged by conventional forging methods, carbides often precipitate between grains, and carburization, nitriding and hydrogen permeation occur in the subsequent heat treatment process, which seriously affects the corrosion resistance of 9Cr18MoV steel.

Method used

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specific Embodiment approach

[0022] To implement the forging and heat treatment method of the 9Cr18MoV steel forging of the present invention, it is necessary to provide equipment such as a high-temperature heating furnace, a press, a manipulator, and a ring rolling mill. The specific implementation is as follows:

[0023] The main chemical element content (weight percentage) of 9Cr18MoV steel is: C content 0.85% ~ 0.95%, Mn content ≤ 0.80%, Si content ≤ 0.80%, Cr content 17.0% ~ 19.0%, Mo content ≤ 1.0% ~1.3%, V content≤0.07%~0.12%, S content≤0.030%, P content≤0.035%, and the balance is Fe.

[0024] The forging and heat treatment process steps of 9Cr18MoV steel forgings are as follows:

[0025] Heat the 9Cr18MoV steel ingot to 1150±10°C for 20-100 minutes, cool to 980±10°C with the furnace and hold for 20-100 minutes, and air cool to room temperature.

[0026] The 9Cr18MoV steel ingot is made into billets within the temperature range of 1000°C to 1150°C. 9Cr18MoV steel forgings are obtained by final f...

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Abstract

The invention discloses a forging and heat treatment method of a 9Cr18MoV steel forging. The forging and heat treatment method comprises the following steps: a 9Cr18MoV steel ingot is put in a heat treatment furnace for performing the heat treatment before the forging, and is forged to produce a blank within a certain temperature range after the heat treatment; the 9Cr18MoV steel blank is finally forged within the certain temperature range to obtain the 9Cr18MoV steel forging; the normalization heat treatment is performed for the 9Cr18MoV steel forging; and the tempering heat treatment is performed for the 9Cr18MoV steel forging. The 9Cr18MoV steel forging has excellent corrosion resistance through reasonably controlling various process parameters, so that the 9Cr18MoV steel forging can be successfully applied to the production of such parts as gas turbines.

Description

technical field [0001] The invention relates to a forging and heat treatment method of a stainless steel forging, in particular to a forging and heat treatment method of a 9Cr18MoV steel forging. Background technique [0002] 9Cr18MoV steel is a martensitic stainless steel with good corrosion resistance. The Mo element and V element added to the steel can improve the pitting corrosion resistance of the steel, and at the same time, improve the thermal strength of the steel so that it can be used at a higher temperature. Many parts of gas turbines use forgings of this material. [0003] When 9Cr18MoV steel is forged by conventional forging methods, carbides often precipitate between grains, and carburization, nitriding, and hydrogen infiltration occur in the subsequent heat treatment process, which seriously affects the corrosion resistance of 9Cr18MoV steel. Contents of the invention [0004] The technical problem to be solved by the present invention is to provide a forg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/00C22C38/24
Inventor 邹伟蒲思洪高先模雍国朝郭浩陆洪波邹坚刘柱柱
Owner GUIZHOU ANDA AVIATION FORGING
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