First, classification of stainless steel
There are many kinds of stainless steel, and the performance is different, the common classification methods are:
According to the structure of the steel classification, such as martensitic stainless steel, ferritic stainless steel, austenitic stainless steel and duplex stainless steel.
According to the main chemical composition of steel or some characteristic elements in steel to classify, such as chromium stainless steel, chromium nickel stainless steel, chromium nickel molybdenum stainless steel and ultra-low carbon stainless steel, high molybdenum stainless steel, high purity stainless steel.
According to the performance characteristics and uses of steel to classify, such as nitric acid (nitric acid grade) stainless steel, sulfuric acid resistant stainless steel, pitting stainless steel, stress corrosion resistant stainless steel, high strength stainless steel, etc.
Classified according to the functional characteristics of steel, such as low-temperature stainless steel, non-magnetic stainless steel, free-cutting stainless steel, superplastic stainless steel and so on.
Second, the role of alloying elements in stainless steel composition
Under normal circumstances, pure metal has relatively high plasticity, when adding other alloying elements, the formation of single-phase solid solution also has good plasticity, such as iron-nickel alloy can form a continuous solid solution, so iron and nickel in any proportion of the case, the plasticity of the alloy is very high.
However, under the condition of containing other elements, the formation of intermetallic compounds that are insoluble in the solid solution or partially soluble in the solid solution reduces the plasticity of the metal, so the plasticity of the alloy is worse than that of the pure metal or single-phase solid solution.
Related: stainless steel pipe production line, high-speed welded steel pipe production line
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