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How To Prevent The Cracking Of Stainless Steel Material?
May 17, 2017

Causes of cracking:

The fracture section of the borehole is in good condition, and the expansion ratio can be found to exceed the limit of the expansion of the 304 steel, which is more than 0.4~0.5.

Preventive measures:

-Blanking after heat treatment: work hardening parts annealing;

- selecting material with excellent formability, converting steel grades: SUS304J1, SUS305;

- improving lubrication conditions and Die surface states, although there is no direct reason for the occurrence of cracking, can reduce the occurrence of cracking by improving lubrication conditions and Die surface states.

Open mouth cracking

For example: solar water heaters, heat exchangers

Flaring tube cracking

Causes and Countermeasures of material cracking

Serial number; cause of occurrence; countermeasure

1 processing beyond the forming limit of the material remains within the forming limit

2, the cleanliness of materials is not enough to improve the cleanliness of materials

3 material elongation is not enough annealing normal processing

Causes and Countermeasures of welding parts cracking:

Serial number; cause of occurrence; countermeasure

1 poor welding result in welding condition not set on welding

2, welding parts cutting edge, lead to welding parts bad, cutting attention

3, welding parts pollution (oil, moisture, dust removal, welding pollution, set the appropriate welding speed

4 rapid welding lead to

5, no attention to the protection and use of combustion supporting gas, so that the welding site oxidation, resulting in protection and careful management of the gas

6 expanding the operation within the machining limit beyond the machining limit of the welding part

7, expanding the pipe speed, adjust the tube speed

8 material cleanness is bad, improve the cleanness of material

9 material elongation is not enough annealing normal processing