Related to the material of stainless steel.
1, some stainless steel material martensite or ferrite is magnetic, due to the smelting of compositional segregation or improper heat treatment, will cause a small amount of martensite or ferrite organization in the austenitic 304 stainless steel pipe.
For example: austenitic 304 stainless steel, knife and scissors type of stainless steel.
2, some stainless steel after cold working, the organizational structure will also be transformed to martensite, the greater the degree of cold working deformation, the more martensite transformation, and thus the greater the magnetic properties.
For example: 304 stainless steel.
Extended information:
Stainless steel according to the material matrix organization classification:
1, ferritic stainless steel. Containing 12% to 30% chromium. Its corrosion resistance, toughness and weldability with the increase in chromium content and improve chloride stress corrosion resistance than other types of stainless steel.
2, austenitic stainless steel. Containing more than 18% chromium, also contains about 8% nickel and a small amount of molybdenum, titanium, nitrogen and other elements. Comprehensive performance is good, can resist a variety of media corrosion.
3, austenitic?
3, austenitic? Ferritic duplex stainless steel. Both austenitic and ferritic stainless steel, and has the advantages of superplasticity.
4, martensitic stainless steel. High strength, but poor plasticity and weldability.
Baidu Encyclopedia - Stainless Steel Materials
Baidu Encyclopedia - Stainless Steel