1.32 1 stainless steel performance introduction
Ti in 32 1 stainless steel exists as a stable element, but it is also a heat-resistant steel, which is much better than 3 16L at high temperature. 32 1 stainless steel has good corrosion resistance in organic acids and inorganic acids with different concentrations and temperatures, especially in oxidizing media, and is used to manufacture linings and conveying pipes of wear-resistant acid containers and wear-resistant equipment.
32 1 stainless steel is Ni-Cr-Ti austenitic stainless steel, and its properties are very similar to those of 304. However, due to the addition of titanium, it has better grain boundary corrosion resistance and high temperature strength Due to the addition of titanium, the formation of chromium carbide is effectively controlled.
32 1 stainless steel has excellent high temperature stress fracture (stress? Fracture) performance and high temperature creep resistance (creep? The mechanical properties of stress resistance are better than those of 304 stainless steel.
Second, the comparison between 32 1 and 304, 3 16L
All of them are austenitic stainless steel with good mechanical properties, including cold working, stamping, flanging and deep drawing. 304 is the most conventional austenitic stainless steel, which is relatively cheap and widely used. It can be used as long as it is not in contact with strong acid and alkali. 32 1 is generally used in chemical industry, and it is resistant to strong acid and alkali. The material contains TI, which has strong corrosion resistance, but the cost is more expensive than 304. 3 16L is generally used in highly corrosion-resistant environments, such as seawater, electroplating bath, watches, medical devices, etc. Its corrosion resistance and mechanical properties are better than the above two, but the cost is also the most expensive.
304 is austenitic chromium-nickel stainless steel, and its main components are 0Cr 18Ni9 or 0Cr 18Ni 10. It is a model that replaces 32 1 stainless steel, but it does not contain titanium, so it is more suitable for civilian use. While 3 16L is ultra-low carbon austenitic Cr-Ni-Mo stainless steel, and its main component is 00Cr 17Ni 14Mo2. The hardness is lower than 304, the wear resistance is slightly poor, but the intergranular corrosion resistance is strong. Can be applied to harsh acidic conditions such as containing a small amount of chloride ions, and is mainly oriented to the chemical industry, and is not suitable for civil products. In the process of contact with iron, surface scratches will cause carburization.
Three. Material properties and application fields of 32 1
32 1 steel has excellent cold and hot working properties, the suitable hot working temperature is 900 ~ 1 150℃, the cold working performance is good, and it can withstand any form of cold working and cold forming. There will be no special difficulties in producing metallurgical products such as plates, tubes, wires, belts, tubes and bar forgings.
The heat treatment process of 32 1 steel usually adopts solution annealing, the solution temperature is 950 ~ 1 150℃, the cooling mode is water cooling, the thin section product can be air cooled, the intermediate annealing temperature of cold working is 850 ~ 970℃, and it is rapidly cooled after heat preservation. This steel is also stable at 850 ~ 930℃.
32 1 austenitic stainless steel acid-resistant steel. It has high intergranular corrosion resistance and good corrosion resistance to some organic acids and inorganic acids (especially in oxidizing medium)? Used for manufacturing acid-resistant pipelines, superheaters and reheaters of large boilers, steam pipelines, heat exchangers in petrochemical industry, etc.