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Damage to stainless steel by cold processing

Release time：

Oct 26,2018

Stainless steel has good plasticity. Cold processing is easy to achieve in stainless steel, but it has certain damage to the performance of stainless steel. The following 304 thick-walled pipe manufacturers will tell you about the damage of cold processing to stainless steel. What is the damage?

1. It will lead to microscopic defects such as material lattice dislocations and increase in surface roughness, and induce martensitic phase transition and precipitation of carbides.For example, austenitic steel exhibits increased magnetism after cold processing.

2. If the material lattice dislocation or phase transition occurs on the surface, it will become the origin of local corrosion such as pore erosion.This phenomenon will have direct adverse effects when the degree of deformation reaches 20% and the cross-section rate is reduced.

3. After cold processing, residual stress will be left in the material, and the residual stress is extremely detrimental to the material's stress corrosion cracking resistance (SCC).Any degree of cold processing will greatly increase the SCC sensitivity of the material.

4. The degree of cold processing also has an adverse effect on the high temperature and long-lasting strength of austenitic stainless steel.Generally, the higher the operating temperature or the higher the fracture life requirements, the lower the degree of cold processing allowed.

5. For stainless steel steel pipe applications that withstand alternating loads, cold processing will adversely affect the cracking and expansion rate due to the decrease in elongation and remaining elongation.

Cold processing methods include cold drawing, cold rolling, cold rolling, cold bending, cold expansion, cold twisting, etc. Stainless steel manufacturers should pay more attention to cold processing.