ASTM A312 TP304 / TP304L Stainless Steel Seamless & Welded Pipes (UNS S30400 / 1.4301 )

ASTM A312 Grade 304 Stainless Steel Piping Solutions

Stainless Steel 304 Pipes (UNS S30400 / W.Nr. 1.4301) are the global benchmark for standard austenitic stainless steel piping systems, celebrated for their exceptional versatility, weldability, and corrosion resistance. Containing approximately 18% Chromium and 8% Nickel, Grade 304 offers superior resistance to atmospheric exposure, chemical oxidation, and varied organic or inorganic media. Designed in full compliance with ASTM A312 and ASME SA312 standards, these pipes serve as critical components in industrial fluid transport, pressure piping systems, structural frameworks, and hygienic processing lines across domestic and international markets.

Technical Specifications & Dimensional Capabilities

To meet diverse engineering requirements, we supply both SS 304 Seamless Pipes (for high-pressure and critical process applications) and SS 304 Welded / ERW / EFW Pipes (for large-diameter structural and low-pressure fluid transport).

Standard Specifications: ASTM A312, ASME SA312, ASTM A213 (Boiler & Heat Exchanger Tubes), ASTM A249, ASTM A269 (General Tubing).

Material Grades: SS 304 (Standard), SS 304L (Low Carbon for heavy welding), SS 304H (High Carbon for elevated temperatures).

Equivalent Standards: UNS S30400 / UNS S30403 (304L), DIN 1.4301 / 1.4307, EN 10217-7, EN 10216-5.

Size Range: 1/2" NB to 24" NB for Seamless | 2" NB to 48" NB for Welded / EFW.

Schedules & Thickness: SCH 5S, SCH 10S, SCH 40/40S, SCH 80/80S, SCH 160, and SCH XXS.

Surface Finishes: Mill Finish, Annealed & Pickled (AP), Bright Annealed (BA), 180/240/320/400 Grit Polished, Mirror Finish.

End Connections: Plain End (PE), Beveled End (BE), Threaded (NPT/BSP), Flanged Ends.

Testing & Certification: 100% Positive Material Identification (PMI), Hydrostatic Testing, Radiography (X-Ray), Eddy Current Test, Mechanical & Chemical Analysis. Supplied with full Mill Test Certificates (MTC EN 10204 3.1).

Performance Characteristics & Material Benefits

Corrosion Resistance: Outstanding endurance against oxidizing acids, ambient moisture, and general chemical exposure.

Fabrication & Weldability: Excellent drawability and weldability; Grade 304L is specifically recommended for heavy-gauge welding to minimize intergranular carbide precipitation.

Cryogenic & High-Temperature Performance: Retains high toughness at sub-zero temperatures while maintaining structural integrity in elevated operating environments up to 870C.

Hygienic Surface Integrity: Smooth inner surface prevents contamination, making it ideal for food-grade, sanitary, and pharmaceutical fluid handling.

Industrial Applications & Industry Usage

Due to its balanced chemical composition and mechanical strength, SS 304 Pipes are extensively specified across:

Food, Dairy & Beverage Processing: Sanitary transfer piping, milk processing units, and brewery lines.

Chemical & Petrochemical Industries: Storage tanks, acid piping lines, and chemical processing equipment.

Pharmaceutical & Biotechnology: Ultra-clean process piping and pure water transfer lines.

Architectural & Structural Engineering: Modern handrails, structural supports, decorative interior/exterior tubing, and coastal architecture.

Water Treatment & Plumbing: Municipal water distribution, desalination plants, and industrial wastewater lines.

Quality Assurance & Export Packaging

Every consignment is subjected to rigorous quality control inspections. Pipes are end-capped with plastic protective caps, bundled with protective wrapping, or packed in sea-worthy wooden crates to ensure zero damage during international shipping or domestic transit.