304L stainless steel pipe, also known as 18/8 SS pipe, is a low-carbon version of 304 stainless steel. It is made from iron, chromium, nickel, and minimal carbon. It is one of the grades of austenitic stainless steel pipes. It offers excellent corrosion resistance for pipes in chemical, food, and sanitary uses.
ASTM A312 304L Stainless Steel Seamless Pipe Manufacturer in China
We, Zhejiang Xintongda Special Steel (XTD), are a leading China-based stainless steel 304L seamless pipe manufacturer and a global supplier. This pipe is a low-carbon austenitic stainless steel that contains about 18% Chromium (Cr) and 8% Nickel (Ni), with a maximum of 0.03% carbon. Our 304L stainless steel seamless pipe is produced in strict compliance with ASTM A312, EN, JIS, and GB standards. This pipe is known for its ability to resist intergranular corrosion and a minimum yield strength of about 170 MPa. Also known as 18/8 stainless steel pipe, it has excellent corrosion resistance and suitability in continuous service temperature (~425–870°C depending on environment). These pipes are important in food processing and sanitary systems. We are a multiple international certified 304L stainless steel pipe supplier and can provide these pipes within a week for stock orders. We also maintain an annual supply capacity of 25,000 tons. Each of our pipes undergoes rigorous quality checks before delivery.
Our pipes meet these specifications:
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Standard
ASTM A312
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OD Range
6-1016 mm
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Thickness
1-65 mm
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Length
≤ 18 m
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Technical Data
Technical Data
How is Stainless Steel 304L Seamless Pipe Manufactured?
The manufacturing process of UNS S30403 pipe begins by heating a solid round steel billet. Then the centre is pierced to create a hollow shell. The shell is rolled and stretched to reach the exact size and thickness required. Finally, the pipe undergoes solution annealing and pickling to restore its corrosion resistance and remove surface scales. To learn in depth about our manufacturing process of seamless pipes, visit this page.
What are the Characteristics of 304L Stainless Steel Seamless Pipe?
304L SS pipes have 5 important characteristics. These are explained below in detail:
- Low Carbon Content: Low carbon content of the pipe minimises carbide precipitation during welding and improves resistance to intergranular corrosion.
- High Strength: The pipe offers a minimum tensile strength of 485 MPa. This allows it to handle high-pressure environments and heavy stress without breaking.
- Excellent Processability: The ASTM A312 TP304L pipe is very easy to weld and shape using standard industrial methods. This makes it a preferred choice for fabricators that create complex piping systems quickly.
- Superior Corrosion Resistance: The high chromium content of this pipe creates a protective layer of chromium oxide that prevents rust and oxidation. This pipe stays clean and smooth even when exposed to water or chemicals.
- Heat Treatments: We use solution annealing to restore the pipe's internal structure after processing. This process ensures the Inox 304L pipe remains durable and flexible for long-term service.
ASTM A312 TP304L Stainless Steel Pipe Tolerance
The table below defines the standard dimensional tolerances for TP304L pipe as specified by the ASTM A312 standard.
| STANDARD | OD (D) mm |
TOLERANCE (mm) Common High |
THICKNESS (S) mm |
TOLERANCE | LENGTH | TOLERANCE |
| A312 | 10.3 ≤ D ≤ 38 | +0.4 / -0.8 | 10.30 ≤ D ≤ 73.0 | +20% / -12.5% | For all sizes | +6.0 / 0 |
| 38 < D ≤ 114.3 | +0.8 / -0.8 | 88.90 ≤ D ≤ 273.05 | +22.5% / -12.5% | |||
| 114.3 < D ≤ 219.1 | +1.6 / -0.8 | 88.90 ≤ D ≤ 457.20 | +22.5% / -12.5% | |||
| 219.1 < D ≤ 457.2 | +2.4 / -0.8 | D ≥ 508.00 (DS ≥ 5, SMLS) | +15% / -12.5% | |||
| 457.2 < D ≤ 660.4 | +3.2 / -0.8 | D ≥ 508.00 (DS ≥ 5, WLS) | +15% / -12.5% | |||
| 660.4 < D ≤ 863.6 | +4.0 / -0.8 | D ≥ 508.00 (WLD) | +17.5% / -12.5% | |||
| 863.6 ≤ D ≤ 1219.2 | +4.8 / -0.8 |
What is the Equivalent Material of 304L Stainless Steel?
The standard equivalent designation of 304L stainless steel is UNS S30403. More global equivalents include EN 1.4307, BS 304S11, and JIS SUS 304L.
| GRADE | UNS | GB | JIS | ISO | DIN/EN | GOST | |
| ISC | NEW | ||||||
| 304L | S30403 | S30403 | 022Cr19Ni10 | SUS304L | X2CrNi19-11 | 1.4307 | 03X18H11 |
100% Certified Testing & Documentation
- EN 10204 3.1 and EN 10204 3.2 Material Test Certificates (MTC)
- Raw Materials Certificate
- 100% PMI
- Heat Treatment Charts
- Third-Party Inspection Report
- Surface roughness and size measurement
- Manufacturer Test Certificate (Impact Testing, Flattening, Flare, Bend, Hardness, Intergranular, Pitting Corrosion, Grain size, ET, UT, HT)
- Laboratory Test Certificate from the Government-Approved Lab
Industry Applications of ASTM A312 TP304L SS Pipe
ASTM A312 TP304L stainless steel pipes are widely used across 5 key industries and applications due to their excellent corrosion resistance, durability, and reliable performance.
Food & Beverage Processing
This pipe transports liquids like milk and juice without changing its taste or safety. The smooth 304L pipe surface prevents bacteria from growing inside the lines.
Pharmaceutical Industry
Factories use these pipes to transport medicine ingredients in sterile cleanrooms. The material does not react with chemicals. This ensures the final medical products remain pure.
Chemical Manufacturing
This ASTM A312 TP304L pipe is perfect for moving acids and alkalis through a factory. It resists thinning and leaking even when carrying very harsh or corrosive fluids.
Automotive Structures
This pipe is used for certain exhaust systems and mufflers as it handles heat well. It stays strong and does not rust away from road salt or moisture.
Architectural Applications
This 304L SS pipe is used for handrails and decorative structural details on modern buildings. The shiny finish looks professional and needs minimum maintenance over many years.
Frequently Asked Questions
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What is a 304L stainless steel pipe?
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Is 304L stainless steel pipe easy to maintain?Yes. 304L stainless steel pipe is easy to maintain with regular cleaning. Use soap and water to clean it and avoid abrasives. After cleaning, make sure to dry it completely to avoid spots. With basic care, it won't rust easily.
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What are the advantages of the SS 304L Seamless Pipe?SS 304L seamless pipe has no welds for higher strength and leak-proof flow. It provides superior corrosion resistance, easy welding, and durability in harsh environments.
- How is Stainless Steel 304L Seamless Pipe Manufactured?
- What are the Characteristics of 304L Stainless Steel Seamless Pipe?
- ASTM A312 TP304L Stainless Steel Pipe Tolerance
- What is the Equivalent Material of 304L Stainless Steel?
- 100% Certified Testing & Documentation
- Industry Applications of ASTM A312 TP304L SS Pipe
- Frequently Asked Questions