1. Non-magnetic stainless steel, primarily strengthened through cold working (which may lead to some magnetism).
2. Magnetic stainless steel, which can be strengthened through cold working.
3. Ferritic stainless steel: Primarily composed of a body-centered cubic ferrite (α phase) crystal structure, it is magnetic and generally cannot be hardened by heat treatment, but cold working can slightly strengthen it.
4. Martensitic stainless steel: Contains a martensitic matrix, is magnetic, and its mechanical properties can be adjusted through heat treatment.
5. Precipitation hardening stainless steel: Contains an austenitic or martensitic matrix, and can be hardened (strengthened) through precipitation hardening (also known as age hardening).
6. Stainless Steel: 1Cr18Ni9Ti, 0Cr18Ni9, 00Cr19Ni10, 0Cr17Ni12Mo2Ti, 00Cr17Ni14Mo2, 304, 304L, 316, 316L, etc. 3. Stainless steel elbows possess certain resistance to corrosion (oxidizing acids, organic acids, cavitation), heat, and wear. They are commonly used in power plants, chemical plants, and petroleum equipment. Stainless steel elbows have poor weldability; therefore, attention should be paid to welding processes, heat treatment conditions, and the selection of appropriate welding electrodes.
