ASTM A312 TP304/304L Stainless steel Seamless Pipe
We are a professional manufacturer of ASTM A312 TP304/304L Stainless steel Pipe,ASTM A312 TP304/304L Welde Pipe,Seamless pipes in China.
We manufacture and supply ASTM A312 TP304 and TP304L stainless steel seamless pipes for chemical processing, water treatment, food processing, petrochemical and general industrial piping applications.
TP304 and TP304L are among the most widely used austenitic stainless steel grades, offering a practical combination of corrosion resistance, mechanical strength, weldability and fabrication performance.
Standard and customized pipe sizes, wall thicknesses and fixed lengths can be supplied with complete inspection documentation.
ASTM A312 TP304/304L Seamless Pipe
ASTM A312/A312M covers seamless, straight-seam welded and heavily cold worked welded austenitic stainless steel pipe intended for high-temperature and general corrosive service.
This page focuses specifically on seamless TP304 and TP304L stainless steel pipe.
| Product | Specification |
|---|---|
| Standard | ASTM A312 / A312M |
| Grades | TP304 / TP304L |
| UNS | S30400 / S30403 |
| Product Form | Seamless Stainless Steel Pipe |
| Typical Size Range | 1/8″–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 dimensions and heavy-wall seamless pipes can be evaluated according to project requirements.
TP304 vs TP304L Stainless Steel Pipe
The main difference between TP304 and TP304L is the maximum carbon content.
TP304L is the low-carbon version of TP304 and is commonly selected for welded piping systems where improved resistance to sensitization and intergranular corrosion after welding is required.
| Property | TP304 | TP304L |
|---|---|---|
| UNS | S30400 | S30403 |
| Carbon, max. | 0.08% | 0.035%* |
| Chromium | 18.0–20.0% | 18.0–20.0% |
| Nickel | 8.0–11.0% | 8.0–13.0% |
| Tensile Strength, min. | 515 MPa | 485 MPa |
| Yield Strength, min. | 205 MPa | 170 MPa |
*Special carbon limits may apply to certain small-diameter or thin-wall products under ASTM A312/A312M.
Chemical Composition
Typical ASTM A312 chemical requirements for TP304 and TP304L are:
| Element | TP304 | TP304L |
|---|---|---|
| C | 0.08 max | 0.035 max |
| Mn | 2.00 max | 2.00 max |
| P | 0.045 max | 0.045 max |
| S | 0.030 max | 0.030 max |
| Si | 1.00 max | 1.00 max |
| Cr | 18.0–20.0 | 18.0–20.0 |
| Ni | 8.0–11.0 | 8.0–13.0 |
Final acceptance should always follow the specified ASTM A312/A312M edition and purchase specification.
304/304L Dual Certified Pipe
TP304/304L dual-certified stainless steel pipe is widely available.
A dual-certified material has chemistry compatible with the lower-carbon requirements of TP304L while also meeting the mechanical property requirements applicable to TP304.
Dual certification must be confirmed by the actual Material Test Certificate (MTC) and should not be assumed from the product description alone.
Heat Treatment
ASTM A312 pipe is supplied in the required heat-treated condition.
For TP304 and TP304L, solution heat treatment is generally performed at a minimum temperature of approximately 1040°C (1900°F) followed by rapid cooling.
Proper solution treatment helps:
- Restore corrosion resistance
- Maintain an austenitic microstructure
- Dissolve chromium carbides
- Provide consistent mechanical properties
- Improve performance after hot or cold working
Applications of TP304/304L Seamless Pipe
ASTM A312 TP304 and TP304L seamless pipes are widely used in:
- Chemical processing
- Petrochemical piping
- Food and beverage processing
- Pharmaceutical equipment
- Water treatment systems
- Pulp and paper plants
- Power generation
- General industrial piping
- Heat exchangers
- Process equipment
For highly chloride-rich environments such as seawater, TP316L, duplex stainless steel or other higher-alloy materialsmay provide better pitting and crevice-corrosion resistance depending on service conditions.
Inspection & Testing
ASTM A312 TP304/304L seamless pipes can be supplied with project-specific inspection and certification.
Available inspection may 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
- Third-party inspection when required
Each pipe can be marked and traced according to heat number, material grade, dimensions, standard and purchase-order requirements.
Frequently Asked Questions
What is ASTM A312 TP304 pipe?
ASTM A312 TP304 pipe is an austenitic chromium-nickel stainless steel pipe manufactured according to ASTM A312/A312M requirements for high-temperature and general corrosive service.
What is the difference between TP304 and TP304L?
The primary difference is carbon content. TP304L contains less carbon, reducing the risk of sensitization and intergranular corrosion associated with welding or certain thermal exposures.
Can TP304 and TP304L be dual certified?
Yes. 304/304L dual-certified material is common when the chemical composition satisfies the TP304L requirements while the mechanical properties also satisfy TP304 requirements.
Is ASTM A312 TP304L suitable for welded piping systems?
Yes. TP304L is commonly selected for welded stainless steel piping because its lower carbon content reduces susceptibility to sensitization during welding. Final material selection should still consider temperature, fluid composition and corrosion conditions.
Related Stainless Steel Pipe Products
- ASTM A312 TP316/316L Stainless Steel Pipe – Molybdenum-alloyed stainless steel pipe with improved resistance to chloride pitting.
- ASTM A312 TP304H Stainless Steel Pipe – Higher-carbon 304 grade for elevated-temperature applications.
- ASTM A312 TP321 Stainless Steel Pipe – Titanium-stabilized stainless steel for elevated-temperature service.
- ASTM A312 TP347/347H Stainless Steel Pipe – Niobium-stabilized stainless steel for high-temperature piping.
- ASTM A403 WP304/WP304L Pipe Fittings – Stainless steel elbows, tees, reducers and caps.
- ASTM A182 F304/F304L Flanges – Forged stainless steel flanges for process piping systems.
ASTM A312 TP304/304L Pipe Manufacturer
We supply ASTM A312 TP304, TP304L and dual-certified 304/304L stainless steel seamless pipes for international industrial piping projects.
Custom sizes, fixed lengths, inspection requirements and project-specific documentation can be supplied according to drawings and purchase specifications.
For quotation, please provide the grade, NPS or outside diameter, schedule or wall thickness, length, quantity and inspection requirements.
