ASTM A312 TP310S Stainless Steel Seamless Pipe | UNS S31008
We manufacture and supply ASTM A312 TP310S stainless steel seamless pipes for high-temperature process piping, furnaces, refineries, petrochemical plants and thermal processing equipment.
TP310S / UNS S31008 / 1.4845 is a high-chromium, high-nickel austenitic stainless steel developed for applications requiring excellent oxidation resistance and structural stability at elevated temperatures.
Standard and customized pipe sizes can be supplied with complete material traceability, inspection reports and EN 10204 3.1 certification.
What Is ASTM A312 TP310S?
ASTM A312 covers seamless, straight-seam welded and heavily cold-worked welded austenitic stainless steel pipes intended for high-temperature and general corrosive service.
| Product | Specification |
|---|---|
| Standard | ASTM A312 / A312M |
| Grade | TP310S |
| UNS | S31008 |
| EN / W.Nr. | 1.4845 |
| EN Name | X8CrNi25-21 |
| Product Form | Seamless Stainless Steel Pipe |
| Typical Size Range | 1/2″–24″ |
| Schedule | SCH 5S–SCH XXS |
| Length | Random / 6 m / Fixed Length |
| Ends | Plain End / Beveled End |
| Surface | Annealed & Pickled |
| Certification | EN 10204 3.1 MTC available |
Special OD, heavy-wall and fixed-length pipes can be supplied according to project requirements.
What Is TP310S Stainless Steel?
TP310S is a 25Cr-20Ni type heat-resistant austenitic stainless steel with lower carbon content than the higher-carbon TP310H grade.
Its high chromium and nickel contents provide good resistance to oxidation and help maintain structural stability at elevated temperatures.
Key characteristics include:
- Very good high-temperature oxidation resistance
- Good resistance to carburizing environments
- Good resistance to sulfidation under suitable conditions
- Good structural stability at elevated temperature
- Good toughness and ductility
- Good weldability
- Suitable for repeated thermal exposure
TP310S is primarily selected for its high-temperature performance, rather than simply for higher room-temperature strength.
ASTM A312 TP310S Chemical Composition
Typical ASTM A312 composition limits for TP310S / UNS S31008 are:
| Element | Composition, wt.% |
|---|---|
| Carbon (C) | 0.08 max |
| Manganese (Mn) | 2.00 max |
| Silicon (Si) | 1.00 max |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.030 max |
| Chromium (Cr) | 24.0–26.0 |
| Nickel (Ni) | 19.0–22.0 |
| Molybdenum (Mo) | 0.75 max |
| Iron (Fe) | Balance |
The high chromium and nickel content is the main reason TP310S performs well in many high-temperature oxidizing environments.
TP310S Mechanical Properties
Typical minimum room-temperature mechanical requirements for ASTM A312 TP310S pipe are:
| Property | Requirement |
|---|---|
| Tensile Strength | 515 MPa min |
| 0.2% Yield Strength | 205 MPa min |
| Longitudinal Elongation | 35% min |
Mechanical properties at elevated temperature are different from room-temperature values and must be evaluated according to the applicable piping or pressure-equipment design code.
High-Temperature Performance
One of the main advantages of TP310S stainless steel pipe is its resistance to oxidation at elevated temperatures.
25Cr-20Ni stainless steels are commonly selected for furnace and thermal-processing applications because they offer useful resistance to:
- Oxidation
- Carburization
- Thermal cycling
- High-temperature gas environments
- Structural degradation at elevated temperature
Material producers report maximum application temperatures in air of approximately 1050–1100°C, depending on material condition and service conditions.
However:
Maximum oxidation temperature is not the same as maximum allowable pressure-piping temperature.
Actual operating temperature and pressure must be determined according to:
- Applicable design code
- Allowable stress
- Pipe wall thickness
- Operating pressure
- Process atmosphere
- Thermal cycling
- Corrosion environment
- Required design life
Heat Treatment
ASTM A312 TP310S pipe is supplied in the required solution heat-treated condition.
For TP310S, solution treatment is performed at a minimum temperature of approximately 1040°C (1900°F) followed by cooling according to the applicable ASTM A312 requirements.
Proper solution treatment helps maintain:
- Austenitic microstructure
- Corrosion resistance
- Ductility
- High-temperature stability
- Consistent mechanical properties
Applications of TP310S Seamless Pipe
ASTM A312 TP310S seamless stainless steel pipes are commonly used in:
- Oil refineries
- Petrochemical plants
- Furnace piping
- Burner components
- Radiant heating systems
- Thermal processing equipment
- Heat-treatment plants
- Combustion systems
- High-temperature process piping
- Chemical processing equipment
- Power-generation facilities
For boiler, superheater and heat-exchanger tubes, ASTM A213 TP310S should be considered instead of automatically specifying ASTM A312 pipe.
TP309S vs TP310S vs TP310H
| Item | TP309S | TP310S | TP310H |
|---|---|---|---|
| Cr-Ni Level | Lower | Higher | Similar to 310S |
| Carbon | Low | Low | Higher / Controlled |
| Oxidation Resistance | Good | Very Good | Very Good |
| Creep Strength Focus | Moderate | Moderate | Higher |
| Typical Application | High-temp general service | Furnace / oxidation service | High-temp creep service |
TP310S and TP310H should not be considered automatically interchangeable.
TP310H has controlled higher carbon and is specifically intended for applications where creep and stress-rupture properties become important at elevated temperatures.
Inspection & Certification
TP310S seamless pipes can be supplied with inspection documentation according to project requirements.
Available inspection and testing include:
- EN 10204 3.1 Material Test Certificate
- Chemical composition analysis
- Tensile testing
- Dimensional inspection
- Visual inspection
- Hydrostatic testing
- Nondestructive electric testing
- PMI testing when specified
- Intergranular corrosion testing when required
- Third-party inspection
Full traceability can be maintained by heat number, grade, standard, dimensions and purchase-order information.
Frequently Asked Questions
What is ASTM A312 TP310S stainless steel pipe?
ASTM A312 TP310S pipe is a high-chromium, high-nickel austenitic stainless steel pipe manufactured for high-temperature and general corrosive service. Its UNS designation is S31008.
What is the maximum temperature of TP310S?
TP310S offers very good oxidation resistance at elevated temperatures, with material-producer application guidance typically reaching approximately 1050–1100°C in air.
This value should not be used directly as the allowable temperature for pressure piping. Pressure design must follow the applicable engineering code and allowable stress values.
What is the difference between TP310S and TP310H?
TP310S is the lower-carbon grade, while TP310H has controlled higher carbon to improve creep and stress-rupture performance at elevated temperature.
Is TP310S suitable for furnace applications?
Yes. TP310S is widely used in furnace and thermal-processing equipment because of its high chromium and nickel content, oxidation resistance and structural stability at elevated temperature.
Related Stainless Steel Products
- ASTM A312 TP309S Stainless Steel Pipe – Heat-resistant stainless steel pipe for elevated-temperature applications.
- ASTM A312 TP310H Stainless Steel Pipe – Higher-carbon 310 grade for creep and stress-rupture service.
- ASTM A312 TP321H Stainless Steel Pipe – Titanium-stabilized H-grade stainless steel for high-temperature piping.
- ASTM A312 TP347H Stainless Steel Pipe – Niobium-stabilized pipe for high-temperature service.
- ASTM A213 TP310S Stainless Steel Tube – Seamless tube for boilers, superheaters and heat exchangers.
- ASTM A403 WP310S Pipe Fittings – TP310S compatible elbows, tees, reducers and caps.
ASTM A312 TP310S Pipe Manufacturer
We supply ASTM A312 TP310S / UNS S31008 stainless steel seamless pipes for international high-temperature and process piping projects.
Customized dimensions, fixed lengths, special inspection requirements and complete material documentation can be supplied according to project specifications.
For quotation, please provide the NPS or outside diameter, schedule or wall thickness, length, quantity and required inspection documents.
Technical References
- ASTM A312/A312M – ASTM International
Official standard for seamless, welded and heavily cold-worked austenitic stainless steel pipe. - UNS S31008 / 1.4845 Technical Data
Manufacturer technical data for 25Cr-20Ni TP310S seamless tube and pipe.
Download ASTM A312 TP310S Seamless Stainless Steel Pipe specification
ASTM A312 TP310S Seamless Stainless Steel Pipe
ASTM A312 TP310S STAINLESS STEEL PIPE
OD:NB 1/8” – 24″,
Wall:SCH 10S , SCH40S, SCH80S, XXS
Length:6M / 20 FT
310S STAINLESS STEEL PIPE, SEAMLESS PIPES ASTM A312 TP310S, ASME B36.19M
- LENGTH: 6METERS FIXED LENGTH OR BY ORDER
- ANNEALING AND PICKLING
- ENDS: PLAIN ENDS, BEVELED ENDS
- TOLERANCE OF THICKNESS: +10%/-5%
- PACKING: ENDS WITH PLASTIC CAPS, THEN BUNDLES OR WOODEN CASES
- MARKING: LOGO,SMLS,ASTM A312 TP310S 1/2” SCH10 6METERS LOT NO.(***) ET/UT
