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- SS SMLS PIPE TP321 ASTM A312
- SS SMLS PIPE TP310S ASTM A312
- SS SMLS PIPE TP316Ti ASTM A312
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- SS SMLS PIPE TP316 ASTM A312
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- SS SMLS PIPE TP304 ASTM A312
ASTM A269/213 TP321 Stainless Steel Seamless Tubes from China Factory - Reliable Suppliers for Fast Delivery
Introduction
TP321 is a titanium (Ti)-stabilized austenitic stainless steel, an improved variant of the 18-8 stainless steel (Cr-Ni series). The addition of titanium (Ti) effectively suppresses the precipitation of chromium carbides (Cr₂₃C₆) at grain boundaries, significantly enhancing the material's resistance to intergranular corrosion, making it ideal for high-temperature and sensitization-prone environments.
Key Features
Titanium Stabilization
Contains titanium (Ti ≥ 5 × C) to prevent chromium carbide (Cr₂₃C₆) formation at grain boundaries.
Eliminates sensitization risk during welding or exposure to 450–850°C, ensuring resistance to intergranular corrosion.
High-Temperature Performance
Operating range: -196°C to 800°C (short-term up to 900°C).
Oxidation resistance: Stable in air, steam, and oxidizing atmospheres.
Corrosion Resistance
Superior to 304/304L in chloride stress corrosion cracking and weak acid environments (e.g., nitric/organic acids).
Resists alkalis and sensitization-induced degradation.
Fabrication Advantages
Weldability: Excellent; no post-weld heat treatment required.
Cold working: Requires intermediate annealing to mitigate work hardening.
Cost-Effective Alternative
More economical than TP316 (no molybdenum) while offering better high-temperature stability than TP304.
Material Specification
Standard:
ASTM A269 & A213
O.D:
1/8" NB TO 32" NB, (10.29MM-812.80MM), (Customization Available)
W.T:
SCH 10S, SCH 40S, SCH 80S, SCH160, SCH XXS (Customization Available)
Application:
Aerospace Industry
Electronics Industry
Instrumentation and Control Systems
Power Generation (Thermal Power Plants)
Petrochemical and Refining
Food and Beverage Industry
Pharmaceutical and Biotechnology
Beverage Packaging and Dairy Equipment
End:
Plain End, Beveled End, Threaded
Processing:
Cut-to-length; Polishing.
Inspection:
100% PMI TESTED
EN10204.3.1B MILL TEST CERTIFICATE
THIRD PARTY INSPECTION ACCEPTED
Delivery Condition:
Cold Drawn, Annealed and Pickled / Polished / Bright Annealed / Sand blasting / Shot Blasting.
Marking:
All SS SMLS Pipes are marked as follows: Standard, Grade, OD, Thickness, Length, Heat No. (Or as per the customer’s request)
Packing:
Packed in Wooden Boxes, plywood cases, Steel Strips Bundled, or as per Customers Requests
Specials:
Sizes and Specifications other than above can be customized on request.
Specification Parameters
CHEMICAL COMPOSITION - TP321 (ASTM A269/A269M)
| HEAT NO. | CHEMICAL COMPOSITION (%) | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| C | Mn | P | S | Si | Ni | Cr | Ti | ||
| STAND. | MIN. | - | - | - | - | - | 9.00 | 17.00 | - |
| MAX. | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 12.00 | 19.00 | D | |
CHEMICAL COMPOSITION - TP321 (ASTM A213/A213M)
| HEAT NO. | CHEMICAL COMPOSITION (%) | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| C | Mn | P | S | Si | Ni | Cr | Ti | ||
| STAND. | MIN. | - | - | - | - | - | 9.00 | 17.00 | - |
| MAX. | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 12.00 | 19.00 | 5(C+N)-0.70 | |
Mechanical Properties
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness MAX | |
|---|---|---|---|---|---|
| Rockwell (HRB) | Brinell (HBW) | ||||
| ASTM A269 TP321 | - | - | - | 90 | 192 |
| ASTM A213 TP321 | 515 | 205 | 35 | 90 | 192 |
Equivalent Grades - (ASTM A269 & A213 TP321 Equivalent Grades)
| USA (ASTM/ASME/AISI) | Japan (JIS) | Germany (DIN/EN) | China (GB) | International (ISO) | United Kingdom (BS) | Russia (GOST) |
|---|---|---|---|---|---|---|
| TP321 UNS S32100 321 S32100 |
JIS G4304 | X10CrNiTi18-9 (DIN) 1.4541 (EN) |
06Cr18Ni11Ti (NEW) 1Cr18Ni9Ti (Old) S32168 |
X6CrNiTi18-10 | 304S12 321S20 (historical) |
12Х18Н10Т |
ASTM A269/A269M Standard Cold Machining Size Deviation Permitted
| Group | Size, Outside Diameter, in. [mm] | Permissible Variations in Outside Diameter, in. [mm] | Permissible Variations in Wall Thickness, % | Permissible Variations in Cut Length, in. [mm] | Thin Walled Tubes | |
|---|---|---|---|---|---|---|
| Over | Under | |||||
| 1 | Up to 1/2 [13] | ±0.005 [0.13] | ±15 | 1/8 [3.2] | 0 | ... |
| 2 | 1/2 to 1 1/2 [13 to 38], excl | ±0.005 [0.13] | ±10 | 1/8 [3.2] | 0 | less than 0.065 in. [1.65 mm] nominal |
| 3 | 1 1/2 to 3 1/2 [38 to 89], excl | ±0.010 [0.25] | ±10 | 3/16 [4.8] | 0 | less than 0.095 in. [2.41 mm] nominal |
| 4 | 3 1/2 to 5 1/2 [89 to 140], excl | ±0.015 [0.38] | ±10 | 3/16 [4.8] | 0 | less than 0.150 in. [3.81 mm] nominal |
| 5 | 5 1/2 to 8 [140 to 203], excl | ±0.030 [0.76] | ±10 | 3/16 [4.8] | 0 | less than 0.150 in. [3.81 mm] nominal |
| 6 | 8 to 12 [203 to 305], excl | ±0.040 [1.01] | ±10 | 3/16 [4.8] | 0 | less than 0.200 in. [5.08 mm] nominal |
| 7 | 12 to 14 [305 to 356], excl | ±0.050 [1.26] | ±10 | 3/16 [4.8] | 0 | less than 0.220 in. [5.59 mm] nominal |
Frequently Asked Questions (FAQ)
What is TP321 stainless steel and what are its main advantages?
TP321 is a titanium (Ti)-stabilized austenitic stainless steel derived from the 18-8 series. The key advantage of adding titanium is that it suppresses chromium carbide precipitation at grain boundaries, which prevents intergranular corrosion and makes it highly suitable for high-temperature and sensitization-prone environments.
What is the operating temperature range for TP321 stainless steel?
TP321 performs reliably in temperature environments ranging from -196°C to 800°C, and can withstand short-term exposure up to 900°C. It exhibits stable oxidation resistance in air, steam, and other oxidizing atmospheres.
In which industries is TP321 stainless steel commonly applied?
TP321 is widely utilized in the aerospace and electronics industries, instrumentation and control systems, power generation (thermal plants), petrochemical refining, food and beverage processing, pharmaceuticals, biotechnology, and dairy equipment.
How does TP321 compare economically to TP304 and TP316?
TP321 serves as a cost-effective alternative. It is more economical than TP316 because it does not contain molybdenum, yet it offers significantly better high-temperature stability and sensitization resistance than TP304.
What are the testing and inspection standards for TP321 pipes?
TP321 pipes undergo 100% PMI (Positive Material Identification) testing. They are supplied with an EN10204.3.1B Mill Test Certificate, and third-party inspections are fully accepted to ensure quality compliance.
What are the international equivalent grades for TP321?
Equivalent grades include UNS S32100 (USA), JIS G4304 (Japan), 1.4541 / X10CrNiTi18-9 (Germany/EN), 06Cr18Ni11Ti / S32168 (China), X6CrNiTi18-10 (ISO), 321S20 (UK), and 12Х18Н10Т (Russia).