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In terms of classification, stainless steel is divided into austenitic stainless steel and martensitic stainless steel. 304 stainless steel is the original Chinese steel grade 0Cr18Ni9, which is an austenitic stainless steel. Not all stainless steel bolts are non-magnetic. Only pure austenitic stainless steel bolts are non-magnetic. It has happened that the standard weight made of austenitic stainless steel bolts is magnetic. A useful way to eliminate magnetism is solid solution heat.
Among the components of stainless steel, there are many valuable alloy components, and the price is usually higher than that of martensitic stainless steel bolts. Austenitic stainless steel bolts are used for many factors with magnetism, so it can not be clarified that the quality will change, which can be determined by analytical chemistry and metallographic examination.