Top 304 Stainless Steel Seamless Pipe Manufacturer in China
Like other seamless pipes, a 304 Stainless Steel Seamless Pipe is an austenitic stainless steel made from grade 304 stainless steel which has 18% chromium and 8 % nickel. A seamless construction means the pipe is produced through an extrusion process, where a solid steel billet is heated and pierced to create a hollow tube, subsequently drawn to the desired size. A uniform structure is thus ensured, making 304 seamless pipes preferable for high temperature and high pressure applications where structural integrity is crucial.
Specification for 304 Stainless Steel Seamless Pipe
Durable stainless steel 304 grade seamless stainless steel pipes have reliable performance as the constituent material is reasonably resistant to corrosion.
| Category | Details |
|---|---|
| Characteristics | 304 Stainless Steel Seamless Pipes are austenitic stainless steel pipes with 18% chromium and 8% nickel (18-8 composition). They are produced without a welded seam via extrusion or piercing, offering a uniform structure. Known for excellent corrosion resistance, non-magnetic properties (in annealed condition), and suitability for high-pressure and sanitary applications. |
| Surface Treatment | - Mill Finish: As-produced, slightly rough surface with a dull appearance. - Pickled and Passivated: Acid-treated to remove impurities and form a protective oxide layer, enhancing corrosion resistance. - Polished: Mechanically polished to a satin, bright, or mirror finish (e.g., 180, 320, or 600 grit) for sanitary or decorative applications. - Bright Annealed: Heat-treated in a controlled atmosphere for a clean, reflective surface. |
| Dimensions and Specifications | - Sizes: Available from 1/8" NB to 24" NB (Nominal Bore), with outer diameters ranging from 10.3 mm to 609.6 mm. - Wall Thickness: Schedules include Sch 5, Sch 10, Sch 40, Sch 80, up to Double Extra Heavy (DXH); thickness ranges from 1.24 mm to 12.7 mm. - Length: Standard lengths of 6 meters (20 feet), with custom lengths up to 12 meters available. - Tolerances: OD ¡À0.125 inches, wall thickness ¡À10%, per ASTM A312. |
| Corrosion Resistance | - General Corrosion: Excellent resistance to a wide range of corrosive environments due to 18% chromium content, forming a passive oxide layer. - Intergranular Corrosion: Susceptible at 425¡ãC¨C860¡ãC due to carbide precipitation; 304L variant (low carbon) mitigates this risk. - Pitting/Crevice Corrosion: Good in mild environments but less resistant to chlorides (e.g., marine settings) compared to 316 stainless steel. |
| Mechanical Properties | - Tensile Strength: 515¨C720 MPa (depending on processing). - Yield Strength: Minimum 205 MPa. - Elongation: Approximately 45%, indicating good ductility. - Hardness: Brinell hardness around 123 HB (annealed condition); can increase with cold working. - Impact Resistance: Good toughness, even at low temperatures. |
| Processability | - Weldability: Excellent; can be welded using TIG, MIG, or other methods; 304L is preferred for welding to avoid carbide precipitation. - Formability: Easily bent, drawn, and formed due to its austenitic structure; suitable for complex piping systems. - Machinability: Moderate; work-hardens during machining, requiring sharp tools and proper cutting speeds. |
| Applications | - Sanitary: Food processing (e.g., dairy, beverage systems), pharmaceuticals (e.g., drug manufacturing), and biotechnology (e.g., bioreactors) due to hygiene compliance. - High-Pressure: Heat exchangers, boilers, condensers, and hydraulic systems. - Chemical/Petrochemical: Pipelines for chemicals, oils, and gases. - Aerospace/Automotive: Fuel lines, exhaust systems. - Architectural: Handrails, structural supports, and decorative elements. |
| Standards | - ASTM A312: Standard for seamless and welded austenitic stainless steel pipes for high-temperature and corrosive service. - ASTM A213: Seamless ferritic and austenitic alloy-steel boiler, superheater, and heat-exchanger tubes. - ASME SA312: ASME specification for pressure applications. - EN 10216-5: Seamless stainless steel pipes for pressure purposes. - DIN 1.4301: European designation for 304 stainless steel. |
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Reliable 304 Stainless Steel Seamless Pipe for Your Needs
Connect with China’s leading manufacturers to source premium-grade stainless steel pipes designed for durability, corrosion resistance, and strict hygiene compliance. Ideal for food processing, pharmaceuticals, biotechnology, and more—reach out today to discover our high-quality, seamless solutions tailored to your needs!
