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Method for improving pitting corrosion resistance and strength of stainless steel

A stainless steel, corrosive technology, applied in the field of improving corrosion resistance and mechanical properties, improving pitting corrosion resistance and strength of 304 stainless steel, can solve undiscovered problems, achieve reduction of alloying cost, simple operation, and increase tensile strength Effect

Active Publication Date: 2018-04-20
SHANGHAI SPACE PRECISION MACHINERY RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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  • Method for improving pitting corrosion resistance and strength of stainless steel
  • Method for improving pitting corrosion resistance and strength of stainless steel
  • Method for improving pitting corrosion resistance and strength of stainless steel

Examples

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Effect test

Embodiment 1

[0040] Pre-heat treatment process:

[0041] (1) Heat the temperature of the air furnace to 1050°C;

[0042] (2) Put in the steel, close the furnace door and keep warm for 30 minutes;

[0043] (3) Open the furnace door, take out the steel and water quench, and the material transfer time is 2s.

[0044] Deformation process:

[0045] (1) Under room temperature, the pre-heat-treated steel is compressed to produce a small deformation of 5%;

[0046] (2) The strain rate is 0.02s -1 .

[0047] Subsequent heat treatment process:

[0048] (1) Put the deformed steel into an air furnace whose temperature has reached 1050°C for 20 minutes;

[0049] (2) Water quenching after taking out, material transfer time 2s.

[0050] Compared with the untreated sample, the mechanical properties of the obtained 304 stainless steel are as follows: figure 1 As shown, the tensile strength increased from 641MPa to 655MPa, an increase of about 2.2%. The pitting corrosion rate is changed from 2.39g / ...

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Abstract

The invention provides a method for improving pitting corrosion resistance and strength of stainless steel. The method comprises the following steps that 1, pre-heat treatment is conducted on the stainless steel; 2, deformation treatment is conducted on the stainless steel obtained after pre-heat treatment; and 3, post-heat treatment is conducted on the stainless steel obtained after deformation treatment. Compared with the prior art, the method has the following beneficial effects that (1) chemical components of the material are not changed, and alloying cost is lowered; (2) conventional equipment is adopted, and operation is simple; and (3) the pitting corrosion rate is lowered by 14.4%-19.7%, meanwhile, tensile strength is improved, and comprehensive application performance of the 304 austenite stainless steel is improved.

Description

technical field [0001] The invention belongs to the field of anti-corrosion technology, and relates to a method for improving the pitting corrosion resistance and strength of 304 stainless steel, in particular to a method for regulating the microstructure of 304 stainless steel through two common methods of heat treatment and room temperature deformation without relying on changing the alloy composition, and improving the corrosion resistance of 304 stainless steel. Methods for corrosion resistance and mechanical properties. Background technique [0002] 304 austenitic stainless steel has good room temperature and low temperature toughness, weldability, corrosion resistance and heat resistance, and is the most widely used stainless steel. Used in synthetic fiber, textile, petroleum, chemical, atomic energy, aerospace and other industrial applications, as various containers and corrosion-resistant parts. Its corrosion resistance directly affects the safety and life of equipm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/00C21D1/18
CPCC21D1/18C21D8/005
Inventor 孙京丽陈莉刘维丽武英英吴宏许恒庭童蕾鸣
Owner SHANGHAI SPACE PRECISION MACHINERY RES INST
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