ASTM A312 TP321 Stainless Steel Seamless Pipe Industrial 12X18H10T Seamless Pipe GOST 9941
ASTM A312 TP321 / UNS S32100 Stainless Steel Seamless Pipe Industrial GOST 12X18H10T Steel Pipe
ASTM A312 TP321 / GOST 9941 12X18H10T is a seamless stainless steel pipe manufactured to either American (ASTM) or R GOST standards. The material is an austenitic stainless steel stabilized with titanium, which provides excellent resistance to intergranular corrosion after welding and maintains high strength at temperatures up to ~870°C (1650°F). It is widely used in petrochemical, power generation, and aerospace applications where both corrosion resistance and thermal stability are required.
Equivalent Material of ASTM A312 TP321 Stainless Steel Seamless Pipe
|
Grade |
UNS No |
Old British |
Euronorm |
Swedish SS |
Japanese JIS |
||
|
BS |
En |
No |
Name |
||||
|
321 |
S32100 |
321S31 |
58B, 58C |
1.4541 |
X6CrNiTi18-10 |
2337 |
SUS 321 |
Chemical Composition of ASTM A312 TP321 Stainless Steel Seamless Pipes
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | Other | |
| 321 | min. max |
- 0.08 |
2.00 | 0.75 | 0.045 | 0.030 | 17.0 19.0 |
- | 9.0 12.0 |
0.10 | Ti=5(C+N) 0.70 |
Mechanical Properties of ASTM A312 TP321 Stainless Steel Seamless Pipes
| Grade |
Tensile Strength |
Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness | |
| Rockwell B (HR B) max | Brinell (HB) max | ||||
| 321 | 515 | 205 | 40 | 95 | 217 |
Key Properties
Both pipes share identical physical and mechanical properties:
Stabilization: The addition of Titanium prevents intergranular corrosion (weld decay). Unlike standard 304 (TP304), TP321/12X18H10T does not require post-weld annealing to resist corrosion in the "heat affected zone" (HAZ).
Temperature Resistance: Suitable for continuous service up to ~870°C (1650°F) . It offers excellent oxidation resistance and creep strength at high temperatures.
Corrosion Resistance: Excellent resistance to oxidation, organic acids, and general atmospheric conditions. It is superior to 304/304L in environments where sensitization (chromium carbide precipitation) is a risk.
Applications
Petrochemical: Refinery piping, heat exchangers, and furnace parts.
Aerospace: Exhaust systems and engine components.
Power Generation: Superheater tubes and boiler components.
Cryogenic: Because it is austenitic, it retains excellent toughness at low temperatures as well.
Chemical Processing: Handling aggressive fluids where welding is required without post-weld heat treatment.
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