Seamless Stainless Steel Pipes for Fluid Transportation

Seamless stainless steel pipes for fluid transportation are standardized industrial pipes designed for conveying liquids, gases, and corrosive media. Manufactured using seamless forming processes, these pipes feature a uniform structure without weld seams, ensuring excellent pressure resistance, corrosion resistance, and long-term operational stability.

They are widely used in industries such as petroleum, natural gas, chemical processing, power generation, food, pharmaceuticals, and water supply systems, making them essential components in modern industrial piping systems.

Common Materials

TP304 / 06Cr19Ni10
Most widely used; general corrosion resistance; suitable for water, steam, and oil

TP304L / 022Cr19Ni10
Ultra-low carbon; improved resistance to intergranular corrosion after welding; ideal for chemical fluids

TP316 / 06Cr17Ni12Mo2
Contains molybdenum; excellent resistance to pitting, seawater, and weak acids

TP316L / 022Cr17Ni12Mo2
Low-carbon version of 316; better weldability; widely used in chemical and marine environments

TP321 / 06Cr18Ni11Ti
Titanium-stabilized; resistant to high temperatures and creep; suitable for medium to high-temperature fluids

Standards

GB/T 14976 – Chinese standard for seamless stainless steel pipes for fluid transportation

ASTM A312 – Widely used international standard for high-temperature and corrosion-resistant pipes

EN 10216-5 – European standard for pressure-purpose seamless stainless steel pipes

Product Features

1. Seamless Structure, High Safety
Eliminates welding defects and leakage risks, ideal for high-pressure and critical systems.

2. Excellent Corrosion Resistance
Chromium forms a dense passive film, providing resistance to oxidation, acids, alkalis, and chlorides.

3. Superior Mechanical Properties
High strength and toughness to withstand pressure fluctuations and impact loads.

4. Smooth Inner Surface, Low Resistance
Reduces flow resistance and improves transport efficiency, suitable for high-purity applications.

5. Long Service Life, Low Maintenance Cost
Corrosion-resistant and durable, reducing replacement frequency.

6. Wide Temperature Resistance
Maintains stable mechanical performance from -196°C to 800°C.

Technical Specifications

OD	6 mm – 630 mm
WT	1 mm – 50 mm
Length	6 m / 12 m / Custom
Surface Treatment	Pickled, polished, sandblasted
Production Process	Hot rolled / Cold drawn
Delivery Condition	Solution annealed
Packaging	Hexagonal bundling, steel frame bundling, wooden pallets, anti-rust packaging

Mechanical Properties

Grade	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)	Hardness
304	≥515	≥205	≥40	≤187 HB
304L	≥485	≥170	≥40	≤187 HB
316	≥515	≥205	≥40	≤187 HB
316L	≥485	≥170	≥40	≤187 HB

Typical Applications

Water supply, HVAC, and fire protection systems

Compressed air, nitrogen, oxygen, and other gas pipelines

Petroleum, lubricating oil, and fuel transportation

Chemical, light industry, food and beverage pipelines

Boilers and heat exchanger piping systems

Municipal engineering, shipbuilding, and mechanical structures

FAQ

Q1: Why choose seamless pipes instead of welded pipes?
A: Seamless pipes have no weld seams, offering more uniform structure and higher pressure resistance, making them ideal for high-pressure and critical systems.

Q2: How to choose between 304 and 316?
A: 304 is suitable for general environments, while 316 is recommended for chloride-containing or corrosive environments.

Q3: Do you support customization?
A: Yes, we support custom sizes, special materials, and various surface treatments.

Q4: Are inspection reports available?
A: Yes, we provide Mill Test Certificates (MTC) and third-party inspection reports.