A Reshaping Method for Quenching Deformation of Ultra-High Strength Steel Thin-walled Shell

A technology of ultra-high-strength steel and thin-walled shells, applied in the field of heat treatment, can solve problems such as increasing product development cycle, reducing pass rate, and assembly difficulties, and achieves the effects of ensuring dimensional stability, high pass rate, and eliminating residual stress

Active Publication Date: 2019-05-07
SHANGHAI XINLI POWER EQUIP RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the structural characteristics of the large aspect ratio and thin-walled shell, the distortion after quenching becomes more serious, resulting in difficulties in subsequent processing and assembly, which have become common problems that lead to increased product development cycles and lower pass rates.

Method used

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  • A Reshaping Method for Quenching Deformation of Ultra-High Strength Steel Thin-walled Shell
  • A Reshaping Method for Quenching Deformation of Ultra-High Strength Steel Thin-walled Shell
  • A Reshaping Method for Quenching Deformation of Ultra-High Strength Steel Thin-walled Shell

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example

[0024] It is implemented on a 30Cr3SiNiMoVA thin-walled shell with a diameter of about 300mm, a length of 2780mm, and a wall thickness of 1.6mm. The design index is that the roundness of the shell is ≤2㎜ (the ellipticity is ≤4㎜). The specific method is as follows:

[0025] Step 1. After the shell is quenched, divide the shell into three sections in the length direction and four equal sections. The section must not be located at the non-linear sections at both ends, such figure 2 shown;

[0026] Step 2. Use a micrometer to measure the ellipticity of the shell on each equal cross-section, mark the sections 1, 2, and 4 where the ellipticity is out of tolerance, and mark the positions of the major and minor axes of the ellipse; see Table 1 for specific data:

[0027] Table 1 Quenching deformation data of 30Cr3SiNiMoVA thin-walled shell

[0028] section

Section 1

Section 2

Section 3

Section 4

Long axis (㎜)

300﹢4.75

300﹢3.27

300﹢1.96

...

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Abstract

The invention discloses an ultra-high strength steel thin-walled shell quenching deformation shaping method, which comprises: after quenching a shell, in a length direction, equally dividing the shell into N sections and N+1 equal cross sections (essential the head end and the tail end); measuring the ellipticity of the shell on each equal cross section by using a micrometer, labeling the cross section having the ellipticity exceeding the tolerance, and labeling the long axis position and the short axis position of the ellipse; during shaping, firstly installing shaping equipment at the cross section having the maximal deformation according a certain method; sequentially measuring the ellipticity of other cross sections, and sequentially installing shaping equipment on the cross section having the ellipticity exceeding the tolerance; re-measuring the ellipticity of each cross section after the shaping, and ensuring that the ellipticity of each cross section is consistent with the ellipticity after the shaping; after installing the shaping equipment, tempering the shell and the equipment; after completing the tempering, disassembling the shaping equipment, and measuring the ellipticity of each cross section; and ending the shaping if the ellipticity of each cross section is within the designed index range, and carrying out secondary shaping according to the method if the ellipticity of the cross section exceeds the tolerance.

Description

technical field [0001] The invention relates to the field of heat treatment, in particular to a shaping method for quenching deformation of an ultra-high-strength steel thin-walled shell. Background technique [0002] Ultra-high-strength alloy steel can be used to make the combustion chamber shell. 30Cr3SiNiMoVA is a typical type of ultra-high-strength alloy steel. 1.20, Mn: 0.50-0.80, Si: 0.90-1.20, Mo: 0.60-0.80, V: 0.05-0.15, P: ≤ 0.02, S: ≤ 0.02. The material mainly relies on quenching + tempering to obtain strength and toughness. [0003] The quenching process must be heated above the austenitizing temperature, followed by rapid cooling to obtain a lath martensite structure with high strength and hardness. During the quenching process, the thermal stress, structural stress, and residual stress of the previous machining process due to thermal expansion and contraction, and structural transformation are superimposed on each other, reaching the yield limit of the metal, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/18C21D9/00
Inventor 张小娟王树松周钟平何飞向超何卫国梅建华
Owner SHANGHAI XINLI POWER EQUIP RES INST
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