Implementation standards: ASTM A240/ASME SA-240, ASTM A276, ASTM a182/ASME sa-182, ASTM a312/ASME a312.
Main components: carbon (C)≤0.08, manganese (Mn)≤2.0, nickel (Ni) 9.0 ~ 12.0, silicon (Si) ≤10, chromium (Cr)17.0 ~/kloc.
Physical properties: 32 1 stainless steel density: 7.98g/cm3.
Mechanical properties: tensile strength: σb≥520Mpa, yield strength σb≥205Mpa, elongation: δ≥40%, hardness ≤ 187(HB).
Corrosion resistance and main use environment:
32 1 stainless steel is Ni-Cr-Mo 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 austenitic stainless steel has good corrosion resistance in the atmosphere and is widely used in petrochemical, electric power, bridges, automobiles and other industries. However, the "stainless" of stainless steel is not absolute. Due to the special use environment, stainless steel will also be corroded. Factors such as medium concentration, pH value and temperature will have great influence on the corrosion resistance of stainless steel. If stainless steel is used for a long time in the sensitization temperature range of 450~850℃, intergranular corrosion will occur. The mechanism is that C combines with Cr at the grain boundary to form Cr23C6 and precipitates, which reduces the Cr content at the grain boundary, which is called "chromium deficiency". Chromium is one of the main elements to inhibit intergranular corrosion. When the Cr content at the grain boundary is lower than 12%, the probability of intergranular corrosion will increase.
The application fields are: oil and gas industrial equipment; Offshore platforms, heat exchangers, underwater equipment and fire fighting equipment; Chemical processing industry, container and pipeline industry; Seawater desalination, high-pressure reverse osmosis equipment and submarine pipelines; Energy industry, such as FGD system, industrial washing system and absorption tower used for desulfurization and denitrification in power plants; Mechanical parts (high strength, corrosion-resistant and wear-resistant parts).