High Precison 304 Stainless Steel Tube Round Section Shape 1.4301 321 904L Sch40 80 100 Gauge Thick 316L 317L Stainless Steel Pipe

304 stainless steel pipe is the industry benchmark for versatile metal tubing, combining reliable corrosion resistance, excellent formability, and long service life. As the most widely used austenitic stainless steel tube in the "18-8" series, it delivers dependable performance across industrial, construction, and municipal applications worldwide.

304 stainless steel pipe belongs to the austenitic stainless steel family, and its performance advantages stem from a precise chemical composition ratio:

• Chromium (Cr): 18–20% — forms a passive film that provides baseline corrosion resistance.
• Nickel (Ni): 8–11% — enhances toughness and corrosion resistance (accounts for over 60% of material cost).
• Carbon (C): ≤0.08% — controls intergranular corrosion tendency.
• Others: Si ≤1.0%, Mn ≤2.0%, S ≤0.03%.

International designations: AISI 304, ASTM TP304, UNS S30400, EN 1.4301, JIS SUS304.

• Resists corrosion from atmosphere, fresh water, and steam — suitable for over 90% of general environments.
• Excellent performance in boiling nitric acid solutions (≤65% concentration).
• Good tolerance to organic acids and weak alkalis.

• Tensile strength: ≥520 MPa
• Yield strength: ≥205 MPa
• Elongation: ≥40% — superior ductility for cold working
• Hardness: HB ≤187
• Density: 7.93 g/cm³

• Non-magnetic (austenitic structure feature).
• Excellent processability: cold-bendable, stampable, and weldable for complex forming.
• Heat resistance: operating temperature range of −196°C to 800°C (up to 1000–1200°C for short-term use).
• Service life: ≥70 years with residual value above 50%, far exceeding ordinary tubing.

• Process: solid billet → piercing → rolling → solution annealing (1010–1150°C).
• Features: no welds, uniform structure, high pressure-bearing capacity (≥30 MPa).
• Applications: high-pressure pipelines, high-temperature environments, critical equipment connections.

• Process: stainless steel coil → forming → TIG/MIG welding → internal/external polishing → hydrostatic testing.
• Features: visible welds, lower cost, high production efficiency.
• Applications: low-pressure fluid transportation, decorative purposes, general construction.

• Industrial finish (NO.1): hot-rolled and pickled, matte appearance.
• Bright annealed finish (BA): cold-rolled and bright annealed, mirror-like effect.
• Brushed finish: linear texture, wear-resistant and scratch-proof, ideal for decoration.

• General environments → 304 (highest cost-performance).
• Welded structures in corrosive environments → 304L.
• High-salt/chloride environments → 316L (20–30% higher cost than 304).

• Chemical pipelines transporting acid-alkali media.
• Heat exchangers and reactor piping systems.
• Food and beverage processing equipment (meets hygiene standards).
• Pharmaceutical material transportation.

• Curtain wall support structures (excellent mirror polishing effect).
• Stair handrails and railings.
• Roof drainage systems.
• Water supply pipelines in high-rise buildings.

• Drinking water transportation (corrosion-resistant, no heavy metal leaching).
• Municipal water supply and drainage pipelines.
• Water treatment equipment connections.

• Spectral analysis: verify Cr/Ni content (Cr 18–20%, Ni 8–11%).
• Magnetic test: 304 should be weakly magnetic or non-magnetic (use a magnet for preliminary inspection).
• Chemical reagent test: special test solution (304 remains unchanged or turns light red within the specified time).

• Surface should be smooth, free of scratches and rust spots, and uniformly colored.
• Authentic products have clear markings: material (304), specifications, and manufacturer code.
• Welds (for welded pipes) should be uniform, free of pores and cracks.

• Hydrostatic test: ensure no leakage (standard pressure ≥1.5× working pressure).
• Mechanical property test: verify tensile strength and elongation meet ASTM standards.
• Corrosion test: salt spray test (≥48 hours for 304, no red rust).

• ASTM A312 — Seamless/Welded Austenitic Stainless Steel Pipes for High-Temperature Service.
• ASTM A269 — Seamless/Welded Austenitic Stainless Steel Tubing for General Service.
• EN 10216-5 — European standard for austenitic stainless steel seamless pipes.
• JIS G3459 — Japanese standard for stainless steel pipes.

• MOQ: 1 ton (negotiable for sample orders).
• Packaging: anti-rust PE film + steel strip bundling + wooden pallets (customizable for sea freight).
• Certifications: ISO 9001, CE, FDA (for food-grade applications); Material Test Report (MTR) provided with each shipment.
• Lead time: 7–15 working days for standard specifications; 20–30 days for custom orders.

304 stainless steel pipe is recognized globally for its cost-performance and versatility, making it the preferred choice for industrial, construction, and municipal projects. For customized specifications or technical support, contact our team for professional solutions.

Our company offers a wide variety of products to meet your multifarious demands. We adhere to the management principles of "quality first, customer first, and credit-based" since our establishment, and we always do our best to satisfy the potential needs of our customers. We sincerely welcome cooperation with enterprises from all over the world to realize a win-win situation as economic globalization continues to develop with irresistible force.