How much do you know about the details of 321 precision stainless steel pipes

The most common ones are 304, 316, and 316L stainless steel pipes. Many people don’t know much about 321 precision stainless steel pipes. What are its characteristics?

1. Material: 321 stainless steel belongs to Ni-Cr-Mo type austenitic stainless steel. Its metal content is very similar to 304, but due to the addition of titanium, it effectively controls the formation of chromium carbide. Its chemical composition is:

Carbon: 0.08; Silicon: 1.00; Manganese: 2.00; Phosphorus: 0.045; Sulfur: 0.030; Nickel: 9.0~12.0; Chromium: 17.0~19.0; Titanium: 5C~0.70

2. Performance: The titanium in 321 precision stainless steel pipes can prevent the pipe fittings from intergranular corrosion, and also has high-temperature stress rupture performance and high-temperature anti-creep performance; that is, it is not easy to oxidize, corrode, wear, or crack or brittle cracking caused by changes in the material structure under high-temperature conditions such as flue gas and water vapor. It also has good stress mechanical properties, which can resist the stress caused by stretching, bending, and impact, and has good plasticity, toughness, rigidity, elasticity, and fatigue resistance; it can withstand high stress without large strain, can resist impact load without being damaged, produce permanent deformation under load without being damaged, and resist permanent deformation or fracture under static load.

3. Use: The application of 321 precision stainless steel pipe is still inseparable from its superior performance. It is mainly used in chemical heating furnaces, boiler pressure vessels, furnaces, diesel machines, and drying equipment that have extremely high requirements for resisting intergranular corrosion. These equipment mainly work in high-temperature environments or open-air environments.

After intergranular corrosion occurs, the surface of the metal still maintains a certain metallic luster, and no signs of damage can be seen by the naked eye, but the bonding force between the grains is significantly weakened, the mechanical properties deteriorate, and it cannot withstand impact, so it is a very dangerous corrosion. The above equipment is a high-risk device. Once the accessories in the equipment cannot resist this corrosion, accidents are likely to occur.