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304/304L Stainless Steel Seamless Pipe
304 / 304L stainless steel seamless pipe is widely used in industrial piping systems that require good corrosion resistance, reliable mechanical properties, and clean surface quality. As an austenitic stainless steel product, it offers excellent formability, weldability, and toughness in a wide range of applications.
304 stainless steel seamless pipe is suitable for general-purpose service in chemical processing, water treatment, food processing, construction, and mechanical systems. 304L stainless steel seamless pipe has a lower carbon content, which improves weldability and reduces the risk of intergranular corrosion after welding.
Our 304 / 304L seamless stainless steel pipes can be supplied in various sizes, standards, and delivery conditions according to project requirements.
Specification of 304 / 304L Stainless Steel Seamless Pipe:
Item | Description |
Product Name | 304 / 304L Stainless Steel Seamless Pipe |
Material Grade | 304, 304L |
UNS Number | S30400, S30403 |
Steel Type | Austenitic Stainless Steel |
Product Form | Seamless Pipe |
Manufacturing Process | Cold Drawn / Cold Rolled / Hot Finished |
Standards | ASTM A312, ASTM A213, ASTM A269, ASME SA312, EN 10216-5 |
Outside Diameter | 6 mm – 630 mm |
Wall Thickness | 0.5 mm – 40 mm |
Length | Random Length / Fixed Length / Customized Length |
Size Type | Metric Size / Inch Size |
Pipe Schedule | SCH 5, SCH 10, SCH 40, SCH 80, SCH 160, XXS |
Surface Finish | Annealed & Pickled (AP), Bright Annealed (BA), Polished |
End Finish | Plain End / Beveled End / Customized |
Heat Treatment | Solution Annealed |
Tolerance | According to ASTM / EN standards |
Testing | Chemical Analysis, Mechanical Test, Hydrostatic Test, UT, ET, PMI, Dimensional Inspection, Surface Inspection |
Certificates | MTC EN 10204 3.1 / 3.2 / PMI Report / Third-Party Inspection Report |
Packing | Bundles, Wooden Cases, End Caps, Waterproof Packing, Seaworthy Export Packing |
Applications | Water Treatment, Food Processing, Chemical Equipment, Structural Use, General Industrial Piping |
Chemical Composition of 304 / 304L Stainless Steel Seamless Pipe
Grade | C | Mn | Si | P | S | Cr | Ni | N |
304 | ≤0.08 | ≤2.00 | ≤0.75 | ≤0.045 | ≤0.030 | 18.00–20.00 | 8.00–10.50 | ≤0.10 |
304L | ≤0.03 | ≤2.00 | ≤0.75 | ≤0.045 | ≤0.030 | 18.00–20.00 | 8.00–12.00 | ≤0.10 |
Mechanical Properties of 304 / 304L Stainless Steel Seamless Pipe
Grade | Tensile Strength | Yield Strength | Elongation | Hardness |
304 | ≥515 MPa | ≥205 MPa | ≥35% | ≤92 HRB |
304L | ≥485 MPa | ≥170 MPa | ≥35% | ≤92 HRB |
Standards of 304 / 304L Stainless Steel Seamless Pipe:
304 / 304L stainless steel seamless pipe can be supplied according to a variety of international standards, depending on the application, pressure requirement, and end-use industry. Common standards include ASTM, ASME, and EN specifications for seamless stainless steel pipe and tube.
ASTM A312 / ASME SA312 – Seamless, welded, and heavily cold worked austenitic stainless steel pipes for high-temperature and general corrosive service
ASTM A213 / ASME SA213 – Seamless ferritic and austenitic alloy steel boiler, superheater, and heat-exchanger tubes
ASTM A269 – Seamless and welded austenitic stainless steel tubing for general service
ASTM A249 – Welded austenitic steel boiler, superheater, heat-exchanger, and condenser tubes
EN 10216-5 – Seamless steel tubes for pressure purposes, stainless steel technical delivery conditions
ASTM A511 – Seamless stainless steel mechanical tubing
JIS G3459 – Stainless steel pipes for ordinary piping
DIN / ISO standards – Available according to specific project requirements
UNS S30400 – 304 stainless steel
UNS S30403 – 304L stainless steel
EN 1.4301 – 304 stainless steel
EN 1.4307 – 304L stainless steel
Advantages of 304 / 304L Stainless Steel Seamless Pipe
Good general corrosion resistance
Excellent formability and weldability
Smooth and clean internal and external surface
Good toughness at low temperatures
Suitable for a wide range of industrial applications
304L offers lower carbon content for improved welding performance
Comparison of 304 and 304L Stainless Steel Seamless Pipe:
Item | 304 Stainless Steel Seamless Pipe | 304L Stainless Steel Seamless Pipe |
Carbon Content | Higher | Lower |
Weldability | Good | Better |
Intergranular Corrosion Resistance | Standard | Better after welding |
Typical Use | General industrial service | Welded systems and corrosive service |
Common Application | Equipment, piping, structural use | Process piping, welded pipelines |
Inspection & Test of 304 / 304L Stainless Steel Seamless Pipe:
304 / 304L stainless steel seamless pipe is inspected and tested to ensure compliance with relevant standards and customer requirements. Common inspection and test items include:
Visual inspection
Dimensional inspection
Chemical composition analysis
Mechanical property test
Hydrostatic test
Ultrasonic or eddy current test
PMI (Positive Material Identification), if required
Intergranular corrosion test, if required
Applications of 304 / 304L Stainless Steel Seamless Pipe:
304 / 304L stainless steel seamless pipe is commonly used in:
General industrial piping
Water treatment systems
Food processing equipment
Beverage processing lines
Chemical transfer systems
Heat exchangers
Architectural and structural applications
Pharmaceutical equipment
Low-corrosion fluid pipelines
Package of 304 / 304L Stainless Steel Seamless Pipe:
304 / 304L stainless steel seamless pipe is usually packed in bundles, wooden cases, or seaworthy export packing to ensure safe transportation and storage. Both ends can be protected with plastic caps, and the pipes are wrapped with woven bags, plastic film, or waterproof materials if required. Packing methods can also be customized according to customer requirements.
FAQ
304 / 304L stainless steel seamless pipe is a type of austenitic stainless steel pipe manufactured without a welded seam. It offers good corrosion resistance, good mechanical strength, and excellent fabrication performance for a wide range of industrial applications.
The main difference is the carbon content. 304L has a lower carbon content than 304, which improves weldability and helps reduce the risk of intergranular corrosion after welding. For welded systems, 304L is often preferred.
Yes. 304 stainless steel seamless pipe has good corrosion resistance in many general industrial and atmospheric environments. However, in chloride-rich or highly corrosive environments, 316L or duplex stainless steel may be a better choice.
Yes. 304L is generally better for welding because its lower carbon content helps minimize carbide precipitation during the welding process. This improves resistance to intergranular corrosion in welded areas.
Common standards include ASTM A312, ASTM A213, ASTM A269, ASME SA312, and EN 10216-5. The applicable standard depends on the intended use, dimensions, and project specifications.
304 / 304L stainless steel seamless pipe can be supplied in a wide range of outside diameters, wall thicknesses, and lengths. Standard sizes as well as customized dimensions may be available depending on production capability and order quantity.
Common surface finishes include annealed and pickled (AP), bright annealed (BA), and polished finishes. The suitable finish depends on the application and project requirements.
Available tests may include chemical composition analysis, mechanical testing, hydrostatic testing, ultrasonic testing, eddy current testing, PMI, dimensional inspection, and surface inspection. Third-party inspection can also be arranged if required.
Yes. EN 10204 3.1 certificates are commonly available. EN 10204 3.2 certificates and third-party inspection reports can also be arranged according to customer or project requirements.
304 / 304L stainless steel seamless pipe is widely used in water treatment, food processing, beverage systems, chemical equipment, heat exchangers, industrial piping, structural applications, and general-purpose fluid transportation.
304 / 304L can be used in mild marine or low-corrosion environments, but it is generally not the first choice for direct seawater or high-chloride exposure. For more demanding marine applications, 316L, duplex 2205, or super duplex 2507 may be more suitable.
It is usually packed in bundles or wooden cases with end caps, waterproof wrapping, and export markings. Seaworthy export packing can be provided for international shipment.
Yes. Customized outside diameters, wall thicknesses, and fixed lengths may be supplied according to project requirements, subject to production capability and minimum order quantity.
Please send your required grade, standard, outside diameter, wall thickness, length, quantity, certificate requirements, and destination port. This helps us provide an accurate quotation and delivery proposal.
