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- SS SMLS PIPE 2205 ASTM A790
- SS SMLS PIPE S31803 ASTM A790
- SS SMLS PIPE 904L ASTM A240
- SS SMLS PIPE TP321 ASTM A312
- SS SMLS PIPE TP310S ASTM A312
- SS SMLS PIPE TP316Ti ASTM A312
- SS SMLS PIPE TP316L ASTM A312
- SS SMLS PIPE TP316 ASTM A312
- SS SMLS PIPE TP304L ASTM A312
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China ASTM A269/213 TP321 Stainless Steel Seamless Tubes - Trusted Suppliers and Factory for Immediate Shipment
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
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Standard:ASTM A269 & A213
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O.D:1/8" NB TO 32" NB, (10.29MM-812.80MM), (Customization Available)
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W.T:SCH 10S, SCH 40S, SCH 80S, SCH160, SCH XXS (Customization Available)
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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
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End:Plain End, Beveled End, Threaded
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Processing:Cut-to-length; Polishing.
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Inspection:
- 100% PMI TESTED
- EN10204.3.1B MILL TEST CERTIFICATE
- THIRD PARTY INSPECTION ACCEPTED
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Delivery Condition:Cold Drawn, Annealed and Pickled / Polished / Bright Annealed / Sand blasting / Shot Blasting.
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Marking:All SS SMLS Pipes are marked as follows: Standard, Grade, OD, Thickness, Length, Heat No. (Or as per the customer’s request)
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Packing:Packed in Wooden Boxes, plywood cases, Steel Strips Bundled, or as per Customers Requests
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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?
TP321 is a titanium (Ti)-stabilized austenitic stainless steel. It is an improved variant of the standard 18-8 series (Cr-Ni series) designed to offer superior resistance to intergranular corrosion.
How does titanium stabilization benefit TP321?
The addition of titanium (Ti ≥ 5×C) effectively prevents the precipitation of chromium carbides (Cr₂₃C₆) at the grain boundaries. This eliminates the risk of sensitization during welding or when exposed to high temperatures ranging from 450°C to 850°C.
What is the operating temperature range for TP321?
TP321 operates efficiently in temperatures ranging from -196°C to 800°C, and can withstand short-term exposure up to 900°C with stable oxidation resistance in air, steam, and oxidizing atmospheres.
Does TP321 require post-weld heat treatment?
No, TP321 possesses excellent weldability, and post-weld heat treatment is generally not required to maintain its corrosion resistance.
What are the primary applications of TP321 stainless steel?
It is widely used in aerospace, electronics, instrumentation and control systems, power generation (thermal power plants), petrochemical and refining, food and beverage, pharmaceutical and biotechnology, and dairy equipment.
What equivalent grades correspond to ASTM A269/A213 TP321?
Equivalent grades include UNS S32100 (USA), JIS G4304 (Japan), 1.4541 / X10CrNiTi18-9 (Germany/EN), 06Cr18Ni11Ti / S32168 (China), X6CrNiTi18-10 (ISO), and 12Х18Н10Т (Russia).