321 Same grade from different country standard
06Cr18Ni11Ti 0Cr18Ni10Ti 1.4541 SUS321 S32168 S32100
321 Chemical component ASTM A240 :
C：≤0.08，Si：≤0.75，Mn：≤2.0，Cr：17.0～19.0，Ni：9.0～12.0，S：≤0.03，P：≤0.045，N：≤0.1 , Ti: 5X(C+N)Min～ 0.70Max
321H Chemical component ASTM A240 :
C：0.04～0.1，Si：≤0.75，Mn：≤2.0，Cr：17.0～19.0，Ni：9.0～12.0，S：≤0.03，P：≤0.045，N: ≤0.1 , Ti : 4X(C+N)Min～ 0.70Max
321/321H mechanical property ASTM A240 :
Tensile strength : > 515 Mpa
Yield Strength : >205 Mpa
Elongation (%): > 40%
Hardness: < HRB95
Description about 321/321H stainless steel
It maintains good resistance to intergranular corrosion at temperatures up to 800-1500 °F (427-816 °C) and chromium carbide precipitation. Due to the addition of titanium to the composition, the 321 alloy can still maintain stability in the case of chromium carbide formation.
321 alloy stainless steel has advantages in high temperature environment due to its excellent mechanical properties. Compared with 304 alloy, 321 alloy stainless steel has better ductility and resistance to stress fracture. In addition, 304L can also be used for anti-sensitization and intergranular corrosion.
Alloy 321 (UNS S32100) is a very stable stainless steel. It maintains good resistance to intergranular corrosion at temperatures up to 800-1500 °F (427-816 °C) and chromium carbide precipitation. Due to the addition of titanium to the composition, the 321 alloy can still maintain stability in the case of chromium carbide formation. Alloy 347 is due to the addition of niobium and tantalum to maintain its stability. .
Alloys 321 and 347 are commonly used for long-term operation at 800-1500 °F (427-816 °C) in high temperature environments. If the application involves only welding or short-time heating, replace it with 304L.
The high temperature operation advantages of 321 and 347 alloys also depend on their good mechanical properties. Compared with 304, 304L, 321 and 347 have better creep stress and stress crack resistance. This allows the pressure of these stable alloys to meet the American Society of Mechanical Engineering boiler regulations and pressure vessel specifications at a higher temperature. Therefore, the maximum operating temperature of 321 and 347 alloys is 1500 °F (816 °C), while 304, 304L is limited to 800 °F (426 °C).
321 and Alloy 347 also have high carbon content, their UNS numbers are: S32109 and S34709.
Application of321 Hot rolled Stainless steel plate
It is used in field open-air machines for chemical, coal and petroleum industries with high resistance to intergranular corrosion, heat-resistant parts for building materials and parts with difficult heat treatment, such as:
1. Petroleum waste gas combustion pipeline
2. Engine exhaust pipe
3. Boiler casing, heat exchanger, furnace components
4. Dust-proof parts for diesel engines
5. Boiler pressure vessel
6. Chemical transport vehicles
7. Expansion joint
8. Spiral welded pipe for furnace pipe and dryer