304 / 304L Stainless Steel Seamless Pipe – High-Performance Austenitic Pipe for Corrosive & High-Temperature Service
Our 304 and 304L stainless steel seamless pipes are manufactured in strict compliance with ASTM A312 / ASME SA312 Grade TP304 and TP304L. Designed for high-temperature and general corrosive service applications.
These austenitic stainless steel seamless pipes offer excellent corrosion resistance, good mechanical properties, and superior weldability. With low carbon content in the 304L variant, the pipe provides enhanced resistance to intergranular corrosion after welding - making it the material of choice for demanding industrial environments
Dimensions & Sizes:
| Parameter | Range |
| Outer Diameter (OD) | 6.0 mm to 710 mm (1/8″ to 28″) |
| Wall Thickness (WT) | 0.6 mm to 48 mm |
| Schedule | Sch 5S / 10S / 20 / 30 / 40S / 60 / 80S / 100 / 120 / 140 / 160 / STD / XS / XXS |
| Length | 5.8 m, 6 m, 11.8 m, 12 m, or as required (up to 20 m max) |
| End Finish | Plain ends, beveled ends for butt welding, or threaded ends per ASME B1.20.1 |
Dimensional Tolerances (per ASTM A312):
| NPS Range | Tolerance |
| 1/8″ – 2.5″ | +20.0% / -12.5% |
| 3″ – 18″ (t/D ≤5%) | +22.5.0% / -12.5% |
| 3″ – 18″ (t/D >5%) | +15.0% / -12.5% |
Standards & Specifications
Our seamless stainless steel pipes meet or exceed multiple international standards:
| Standard | Scope |
| ASTM A312 / ASME SA312 | Seamless and welded austenitic stainless steel pipes for high-temperature and general corrosive service |
| ASTM A269 | Seamless and welded austenitic stainless steel tubing for general service |
| ASTM A213 / ASME SA213 | Seamless ferritic and austenitic alloy-steel tubes for boilers, superheaters, and heat exchangers |
| EN 10216-5 | Seamless steel tubes for pressure purposes - stainless steel tubes |
| JIS G3459 | Stainless steel pipes |
| GB/T 14976 | Stainless steel seamless tubes for fluid transport |
| DIN / BS | Available upon request |
Material Grades
| Grade | UNS Designation | EN Equivalent |
| TP304 | S30400 | 1.4301 / X5CrNi18-10 |
| TP304L | S30403 | 1.4307 / X2CrNi18-9 |
Chemical Composition (ASTM A312):
| Element | TP304 (%) | TP304L (%) |
| Carbon (C) | ≤0.08 | ≤0.035 |
| Silicon (Si) | ≤1.00 | ≤1.00 |
| Manganese (Mn) | ≤2.00 | ≤2.00 |
| Phosphorus (P) | ≤0.045 | ≤0.045 |
| Sulfur (S) | ≤0.030 | ≤0.030 |
| Chromium (Cr) | 18.0 – 20.0 | 18.0 – 20.0 |
| Nickel (Ni) | 8.0 – 11.0 | 8.0 – 13.0 |
| Molybdenum (Mo) | – | – |
Mechanical Properties:
| Property | TP304 | TP304L |
| Tensile Strength (min.) | 515 MPa [75 ksi] | 485 MPa [70 ksi] |
| Yield Strength (min.) | 205 MPa [30 ksi] | 170 MPa [25 ksi] |
| Elongation in 2" (min.) - Longitudinal | 0.35 | 0.35 |
| Elongation in 2" (min.) - Transverse | 0.25 | 0.25 |
| Hardness (Rockwell B, max.) | 90 HRB | 90 HRB |
Surface Finish Options:
Annealed & Pickled
Bright Annealed (BA)
Polished (No. 4, No. 6, No. 8 Mirror, HL)
As-drawn (customized upon request)
304 vs. 304L – Which One Should You Choose?
| Feature | 304 (TP304) | 304L (TP304L) |
| Carbon Content | ≤0.08% | ≤0.035% |
| Yield Strength | ≥205 MPa | ≥170 MPa |
| Tensile Strength | ≥515 MPa | ≥485 MPa |
| Weldability | Good - but requires post-weld heat treatment for corrosive service | Excellent - no post-weld heat treatment required |
| Intergranular Corrosion Resistance (after welding) | Moderate | Superior |
| Cost | Slightly lower | Slightly higher |
| Recommended Use | General corrosive service, non-welded applications | Welded structures and services where post-weld heat treatment is impractical |
Recommendation: For welded assemblies or applications involving elevated temperatures, 304L is the preferred grade due to its superior resistance to intergranular corrosion. For non-welded or low-corrosion environments, 304 provides a cost-effective solution with higher mechanical strength.
Packing & Shipping
We offer export-ready packaging solutions to ensure your products arrive in perfect condition:
| Packing Type | Description |
| Bundle Packing | Hexagonal bundles secured with steel straps, wrapped in waterproof HDPE material |
| Wooden Cases | Sturdy, ISPM-15 heat-treated wooden cases with internal cushioning for maximum protection during sea freight |
| Wooden Pallets | Heat-treated pallets compliant with international phytosanitary standards |
| Custom Packing | Tailored solutions based on customer requirements and destination conditions |
Protection Features:
-Plastic end caps to prevent contamination and damage to pipe ends
-Waterproof and moisture-proof wrapping (VCI paper or plastic film)
-Steel strapping for secure bundling
-Clear labeling with heat numbers, specifications, and handling instructions
-Photo documentation of packing process available upon request
Applications
Our 304/304L stainless steel seamless pipes are widely used across multiple industries:
| Industry Sector | Typical Applications |
| Chemical & Petrochemical | Piping systems for transporting corrosive chemicals, acids, and alkalis; process lines in refineries and fertilizer plants |
| Oil & Gas | Downstream process piping, high-pressure/high-temperature pipeline systems, gas delivery lines |
| Food & Beverage | Sanitary tubing for dairy, beverage, and food processing equipment; storage and transport piping |
| Pharmaceutical & Medical | Clean piping systems for pharmaceutical manufacturing; surgical instruments and medical devices |
| Power Generation | Heat exchanger tubes, condenser tubes, boiler tubes, superheaters |
| Water Treatment | Wastewater treatment piping, desalination systems, pure water distribution |
| Construction & Architecture | Structural supports, handrails, balustrades, decorative piping for buildings and bridges |
| General Industrial | Hydraulic systems, pneumatic lines, instrument tubing, mechanical components |
Why Choose Us?
✅ Factory Direct Supply – Competitive pricing with no middlemen
✅ Full Traceability – Heat numbers and batch records maintained throughout
✅ Global Export Experience – Supplying to customers in Europe, Americas, Middle East, Southeast Asia, and Africa
✅ Timely Delivery – Reliable production scheduling and logistics coordination
✅ Customer-Centric Service – Custom sizes, finishes, and certifications available upon request
✅ After-Sales Support – Technical assistance and documentation support for customs clearance
Export Certifications & Documentation
To facilitate smooth international trade, we provide comprehensive export documentation:
| Document | Description |
| Mill Test Certificate (MTC) | EN 10204 Type 3.1 (standard) or Type 3.2 (third-party witnessed, available upon request) |
| ISO 9001:2015 | Quality management system certification |
| PED 2014/68/EU | CE-marking for pressure equipment (available upon request) |
| Chemical Composition Report | Actual batch composition analysis |
| Mechanical Properties Report | Tensile, yield, and elongation test results |
| Hydrostatic Test Report | Pressure test verification |
| NDT Report | Eddy current or ultrasonic test results |
| Commercial Invoice & Packing List | Complete shipping documentation |
| Certificate of Origin | Issued by chamber of commerce or authorized body |
| Third-Party Inspection | SGS, BV, TÜV, or as specified by customer |
Our address
Rm1406,14th/F No 208, Hongqi Road, Nankai Dist, Tianjin City ,China
Phone Number (WhatsApp/Wechat)
+8616622033809
alisa@tjshenzhoutong.com
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