ASTM A312 TP321 Seamless Stainless Steel Pipe,SA 312 TP321 pipe
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ASTM A312 TP321 seamless stainless steel pipe, also known as ASME SA 312 TP321 pipe, is a titanium-stabilized austenitic stainless steel pipe designed for high-temperature and corrosive service conditions.
Compared with standard 304 stainless steel pipes, TP321 offers improved resistance to intergranular corrosion, especially after welding and prolonged exposure to elevated temperatures.
TP321 seamless pipes are widely used in petrochemical, refinery, power generation, and heat exchanger systems, where reliability and long service life are critical.
A312 TP321 pipes are made from stainless steel alloy TP321, which contains titanium as a stabilizing element. This titanium addition improves the pipes’ resistance to intergranular corrosion and provides enhanced strength and stability at elevated temperatures.
ASTM A 312 Standard Specification for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes
Also referred to as by its trade name UNS S32100, stainless steel grade ASTM A312 Tp321 is a titanium stabilized alloy. The SS 321 Welded Pipe produced under specification ASTM A312 has been designed to resist intergranular corrosion, especially in high temperature settings. At a temperature between 800 to 1500°F, the more conventionally used austenitic stainless steel grades are susceptible to chromium carbide precipitation.
ASTM A312 TP321 Pipe specification.
Grade: TP321, 321H,
Standard:Astm A312
Size: OD: 10.3-762mm WT: 1-50mm
Length: fixed length or random
Delivery condition: annealing/pickling/ passivization
Packaging: bundle, plywood case.
seamless, straight-seam welded, and heavily cold worked welded austenitic stainless steel pipe intended for high-temperature and general corrosive service.
| ASTM A312 TP321 Stainless Steel Seamless Pipes | ||||
| Sr. No. | Material | Size | Sch. | Specification |
| 1 | Seamless Pipe | 15 NB To 300 NB |
Sch. 5s Sch. 10s Sch. 40s Sch. 80s Sch. 160s Sch. XXS |
ASTM A 312 |
| 2 | Welded (ERW) Pipe | 15 NB To 300 NB |
Sch. 5s Sch. 10 Sch. 40s & Sch. 80s |
ASTM A 312 |
| 3 | Welded (ERW) Pipe | 150 NB To 600 NB |
Sch. 5s Sch. 10s Sch. 40s & Sch. 80s |
ASTM A 358 |
Chemical Composition of ASTM A312 TP321 Stainless Steel Pipes
| C % | Si % | Mn % | P % | S % | Cr % | Ni % | Ti % |
| 0.08 max | 0.75 max | 2.00 max | 0.045 max | 0.030 max | 17.0-19.0 | 9.00-12.0 | 5*C-0.7 |
Mechanical Properties of ASTM A312 TP321 Stainless Steel Pipes
| Tensile Strength, Mpa | Yield Strength, MPa | Elongation, % |
| 515 min | 205 min | 35 min |
How to order the ASTM A312 TP321 Pipes?
Example#1,
ASTM A312 TP321 Pipes Seamless Stainless Steel, 10 Inch, Schedule 40S, Bevelled End, length 6M.
ASTM A312 / ASME SA 312 TP321 seamless stainless steel pipes provide a reliable solution for high-temperature and welded applications.
With titanium stabilization, excellent corrosion resistance, and compliance with international standards, TP321 pipes are a preferred choice for demanding industrial piping systems.
FAQ
What is the difference between TP321 and TP321H?
TP321H has higher carbon content for improved high-temperature strength.
Is TP321 better than 304L?
For high-temperature service, TP321 provides better resistance to carbide precipitation.
Can TP321 be used for pressure piping?
Yes, ASTM A312 TP321 is specifically designed for pressure and high-temperature applications.
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