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Method for overcoming surface pockmark defect during casting of low-content chromium nickel stainless steel

A stainless steel, low-content technology, applied in the field of low-content chromium and nickel stainless steel casting, can solve the problems of pitting on the surface, pitting on the surface of chrome-nickel stainless steel, etc., and achieve the effect of simple method, low cost, and elimination of pitting defects

Inactive Publication Date: 2017-06-13
SHAANXI HONGYUAN AVIATION FORGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Provide a method to solve the surface pitting defects of low-content chromium-nickel stainless steel castings, use low cost and simple operation to solve the problem of surface pitting in low-content Cr and Ni stainless steel castings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: The design requirement of a channel casting is ZG1Cr11Ni2WMoV investment casting, and the surface roughness of the casting is required to reach Ra6.3. Therefore adopted the method production of the present invention. That is, after the castings are poured, the castings are placed together, and the castings are buckled and sealed with a steel sealing cover, and kerosene or wax blocks are burned in the cover to generate CO gas and form a reducing atmosphere. Cool and solidify to prevent the casting from producing oxides on the surface of the casting during solidification and further reacting with shell impurities to cause surface pits.

Embodiment 2

[0015] Example 2: After the castings are poured, put the castings together, seal the castings with a steel sealing cover, and pass CO gas into the cover to form a reducing atmosphere, so that the castings are cooled and solidified in the reducing atmosphere , to prevent the casting from producing oxides on the surface of the casting during solidification and further reacting with shell impurities to cause surface pits.

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PUM

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Abstract

The invention relates to the technical field of low-content chromium nickel stainless steel casting, in particular to a method for overcoming the surface pockmark defect during casting of low-content chromium nickel stainless steel. After a low-content chromium nickel stainless steel casting is poured, a sealing cover is used for sealing the casting in the solidification process, reduction gas is added into the cover or a reducing atmosphere is manufactured, the casting is cooled and solidified in the reducing atmosphere, the oxidation process is prevented, and accordingly the purpose of preventing the surface pockmark defect of the casting can be achieved.

Description

technical field [0001] The invention relates to the technical field of low-content chromium and nickel stainless steel casting, in particular to a method for solving surface pitting defects of low-content chromium-nickel stainless steel. Background technique [0002] When the stainless steel w(Cr)<20%, w(Ni)<10%, during the casting process, the surface of the casting is very prone to pit defects, which will affect the surface quality of the casting, and even cause the casting to be scrapped directly. The factory produces such castings cause greater losses. Generally speaking, the measures commonly adopted by everyone to prevent such defects include the following methods: [0003] 1. Reduce oxides in molten metal and improve the quality of molten metal; [0004] 2. Reasonably select the shell material and ensure the quality; [0005] 3. Choose a reasonable shell roasting process and strictly implement it; [0006] 4. Use neutral or alkaline adhesives; [0007] Thes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D27/00
CPCB22D27/00
Inventor 周雷高眏民刘俊英
Owner SHAANXI HONGYUAN AVIATION FORGING