Analysis of weld cracking and corrosion cracking of stainless steel decorative balls!
stainless steel tensile delay cracking phenomenon and treatment methods; At present, ferritic stainless steel and austenitic stainless steel are usually used in stainless steel production and processing. After the processing is completed, cracking may occur depending on the degree of stretching. Delayed cracking of austenitic stainless steel is mainly determined by its own structure. There is residual internal stress and martensitic transformation caused by cold working, and fracture occurs at the mouth. Residual stress and martensitic structure must be eliminated to cause phase transformation at high temperature. The annealing temperature of 304 stainless steel is 1010-1050 degrees Celsius.
in order to avoid the overall annealing deformation of the tensile part, only the mouth part is annealed, such as high frequency annealing. Ferritic stainless steel products do not undergo phase transformation after stretching, and cracks are mainly caused by residual stress and must be annealed. Stainless steel decorative ball stretching without cracking method; Appropriate use of lubricant to form a tough film between the concave and convex dies, which is conducive to the stretch molding of stainless steel decorative balls.
If you want to manufacture a tensile part with a large tensile deformation range, you can use a PVDF film as a lubricant because it has the characteristics of tear strength and good lubrication effect, it can effectively isolate the stainless steel plate from the mold surface. In addition, there are other methods, such as using white cast iron as a blank holder mold to form a lubricating oil film with good storage performance. It is also possible to use a tapered crimping ring to smooth the edge of the workpiece and remove the gap to effectively prevent cracking.
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