Different 1Cr18Ni9Ti/321 stainless steel
Different 1Cr18Ni9Ti/321 stainless steel
1Cr18Ni9Ti/321 stainless steel (UNSS321 stainless steel) is a very stable stainless steel. At the temperature of 800-1500°F (427-816°C), chromium carbide precipitation conditions can still maintain good resistance to intergranular corrosion. Due to the addition of titanium to the composition, 1Cr18Ni9Ti stainless steel alloy can still maintain stability in the case of chromium carbide formation.
1Cr18Ni9Ti/321 stainless steel has the advantage of working in high temperature environment due to its excellent mechanical properties. Compared with 304 alloy, 1Cr18Ni9Ti stainless steel has better ductility and stress fracture resistance. In addition, 304L can also be used to resist sensitization and intergranular corrosion.
1Cr18Ni9Ti/321 stainless steel /321H stainless steel
General attribute
Chemical composition
Corrosion resistance
Resistance to high temperature oxidation
Physical property
Mechanical property
process
Heat treatment
General attribute
1Cr18Ni9Ti is a very stable stainless steel. At the temperature of 800-1500°F (427-816°C), chromium carbide precipitation conditions can still maintain good resistance to intergranular corrosion. Due to the addition of titanium to the composition, 1Cr18Ni9Ti stainless steel alloy can still maintain stability in the case of chromium carbide formation. Alloy 347 is due to the addition of COQ and tantalum to maintain its stability. .
1Cr18Ni9Ti stainless steel and 347 alloy are commonly used for long-term operations at high temperatures of 800-1500°F (427-816°C). If the application only involves welding or short time heating, 304L can be used instead.
The high temperature operation advantages of 1Cr18Ni9Ti stainless steel and 347 alloy also depend on their good mechanical properties. Compared with 304,304 L, 1Cr18Ni9Ti stainless steel and 347 have better creep stress resistance and stress rupture resistance. This allows these stable alloys to meet ASME Boiler Code and pressure vessel specifications at slightly higher temperatures. Therefore, the maximum service temperature of 1Cr18Ni9Ti stainless steel and 347 alloy can reach 1500°F(816°C), while 304,304 L is limited to 800°F(426°C).
1Cr18Ni9Ti stainless steel and alloy 347 also have high carbon content varieties, their UNS numbers are: 1Cr18Ni9Ti stainless steel 09 and S34709.
