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questions :Definition of stainless steel
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[Visitor (112.0.*.*)]answers [Chinese ]Time :2022-05-18
Ferritic stainless steel

Contains chromium 15% to 30%. Its corrosion resistance, toughness and weldability increase with the increase of chromium content, chloride stress corrosion resistance is better than other types of stainless steel, belonging to this category are Crl7, Cr17Mo2Ti, Cr25, Cr25Mo3Ti, Cr28 and so on. Ferritic stainless steel because of the high chromium content, corrosion resistance and oxidation resistance are better, but the mechanical properties and process performance are poor, mostly used for acid-resistant structures with little stress and used as antioxidant steel. This type of steel can resist the corrosion of atmospheric, nitric acid and brine solutions, and has the characteristics of good oxidation resistance at high temperature, small coefficient of thermal expansion, etc., used in nitric acid and food factory equipment, and can also be used to make parts that work at high temperatures, such as gas turbine parts.

Austenitic stainless steel
It contains more than 18% chromium, and also contains about 8% nickel and a small amount of molybdenum, titanium, nitrogen and other elements. Good comprehensive performance, can resist a variety of media corrosion. The common grades of austenitic stainless steels are 1Cr18Ni9, 0Cr19Ni9, etc. The Wc < of 0Cr19Ni9 steel is 0.08%, and the steel number is marked as "0". This type of steel has good plasticity, toughness, weldability, corrosion resistance and non-magnetic or weak magnetic properties, corrosion resistance in oxidizing and reducing media are good, used to make acid-resistant equipment, such as corrosion-resistant containers and equipment linings, conveying pipelines, nitric acid-resistant equipment parts, etc., in addition to stainless steel watch jewelry body material.Austenitic stainless steels generally adopt solid solution treatment, that is, the steel is heated to 1050 ~ 1150 °C, and then water-cooled or air-cooled to obtain single-phase austenitic tissue...
Austenitic-ferritic duplex stainless steel
It has the advantages of both austenitic and ferritic stainless steels and is superplastic. Austenite and ferrite tissues each account for about half of stainless steel. In the case of low carbon content, the chromium (Cr) content is 18% to 28%, and the nickel (Ni) content is 3% to 10%. Some steels also contain Mo, Cu, Si, Nb, Ti, N and other alloying elements. This type of steel has the characteristics of both austenitic and ferritic stainless steel, compared with ferrite, plasticity, toughness is higher, no room temperature brittleness, intergranular corrosion resistance and welding performance are significantly improved, while maintaining the 475 °C brittleness of ferritic stainless steel and high thermal conductivity, with superplasticity and other characteristics. Compared with austenitic stainless steels, the strength is high and the resistance to intergranular corrosion and chloride stress corrosion is significantly improved.Duplex stainless steel has excellent corrosion resistance and is also a nickel-saving stainless steel...
Precipitation hardened stainless steel

The matrix is austenitic or martensitic tissue, and the commonly used grades of precipitation-hardened stainless steel are 04Cr13Ni8Mo2Al. It can harden (strengthen) stainless steel by precipitation hardening (also known as aging hardening).

Martensitic stainless steel

High strength, but poor plasticity and weldability. The commonly used grades of martensitic stainless steel are 1Cr13, 3Cr13, etc., because of the high carbon content, it has higher strength, hardness and wear resistance, but the corrosion resistance is slightly worse, which is used for some parts with higher mechanical properties and general corrosion resistance requirements, such as springs, turbine blades, hydraulic press valves, etc. This type of steel is used after quenching and tempering. After forging and stamping, it is necessary to anneal.
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