The picture above is a frame-shaped article. It is recommended to knock it with a wooden hammer, preferably without metal tools, because it will produce new marks. Because it is stainless steel, oxyacetylene molding is definitely not desirable, and oxyacetylene will change the material.
Stainless steel for pressure vessels has clear requirements on its classification and code, size, shape and allowable deviation, technical requirements, test methods, inspection rules, packaging, marks and product quality certificates.
Commonly used brands are 06Cr 19Ni 10, 022Cr 17Ni 12Mo2, and their numerical codes are: S30408, S3 1603, etc. Mainly used in food machinery, pharmaceutical machinery and other sanitary equipment.
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Most stainless steel products require good corrosion resistance, such as first-class and second-class tableware, kitchen utensils, water heaters, water dispensers and so on. There are also foreign businessmen who do corrosion resistance tests on products: boil with NACL aqueous solution, pour out the solution after a period of time, wash and dry, and weigh the weight loss to determine the corrosion degree (note: the abrasive cloth or sandpaper contains Fe when the product is polished, which will lead to rust spots on the surface during testing).
Carbon is strongly formed and stable in austenitic stainless steel. An element that defines austenite and expands the austenite region. The ability of carbon to form austenite is about 30 times that of nickel. Carbon is a interstitial element, and the strength of austenitic stainless steel can be significantly improved by solid solution strengthening. Carbon can also improve the stress resistance and corrosion resistance of austenitic stainless steel in high concentration chloride.
Baidu encyclopedia-stainless steel