October 21, 2022
321 round rod 0cr18ni9ti stainless steel rod TP321 stainless steel round steel 304S12
Alloy 321 (UNS S32100) is a stainless steel with excellent stability. At temperatures up to 800 -- 1500°F (427 -- 816°C) and chromium carbide precipitation, it can still maintain good resistance to intergranular corrosion. Due to the addition of titanium to the composition, the 321 alloy remains stable in the presence of chromium carbide. The alloy 347 is stabilized by the addition of KE and tantalum
Alloys 321 and 347 are commonly used for long term operations at high temperatures ranging from 800 to 1500°F (427 to 816°C). If the application only involves welding or short heating, use 304L instead.
The high temperature operation of 321 and 347 alloys also depends on their good mechanical properties. Compared with 304, 304L, 321 and 347 have better creep stress resistance and stress fracture resistance. This allows these stable alloys to remain under the ASME Boiler Code and Pressure Vessel Code at higher temperatures. Therefore, 321 and 347 alloys can be used at high temperatures up to 1500°F (816°C), while 304,304 L is limited to 800°F (426°C).
321 and alloy 347 also have high carbon content varieties, their UNS number: S32109 and S34709.
321 Chemical composition: Carbon: 0.08 silicon: 1.00 Manganese: 2.00 Phosphorus: 0.045 sulfur: 0.030 Nickel: 9.00-12.00 Chromium: 17.00-19.00 Titanium: 5C-0.70
German brand number: X10CrNiTi189
Austenitic stainless steel is equivalent to domestic brand 0Cr18Ni10Ti 321 stainless steel is Ni-Cr-Mo austenitic stainless steel, its performance is very similar to 304, but due to the addition of titanium metal, so that it has better grain boundary corrosion resistance and high temperature strength. The addition of titanium controls the formation of chromium carbide.
321 austenitic stainless steel has good corrosion resistance in the atmosphere and is used in petrochemical, electric power, bridge and automobile industries [1]. But the "rust" of stainless steel, due to the service environment, stainless steel corrosion will occur. The medium concentration, pH value, temperature and other factors will have a great impact on the corrosion resistance of stainless steel. For example, in the sensitization temperature range of 450~850℃ for a long time, stainless steel will occur intergranular corrosion. The mechanism is that C binds with Cr at the grain boundary to form Cr23C6 and precipitates, which reduces the content of Cr at the grain boundary, which is the so-called "poor chromium". Cr is one of the main elements to inhibit intergranular corrosion. When the content of Cr at grain boundaries is lower than 12%, the probability of intergranular corrosion will increase.
