Stainless Steel Seamless Pipes 6mm, ASTM A358, Cryogenic, LNG Storage Tanks

Stainless Steel Seamless Pipes (6mm OD)​ are precision-manufactured for cryogenic applications, including liquefied natural gas (LNG) storage, aerospace fuel systems, and ultra-low-temperature processing. Compliant with ​ASTM A358, these pipes excel in environments as cold as ​**-196°C**​ due to their superior impact resistance, ductility, and resistance to thermal contraction. The seamless design eliminates weak points, ensuring leak-proof performance under extreme pressure (up to 220 bar). Grade 304/316L variants are optimized with controlled carbon content (≤0.03% for 316L) and stabilized austenitic structure to prevent carbide precipitation and brittleness. Electropolished surfaces and argon-purged welding further enhance purity for LNG containment and oxygen-sensitive industrial processes.

2. Detailed Specifications

3. Advantages of Importing Our Product

1. ​Cryogenic Expertise: Seamless cold-drawn manufacturing ensures uniform grain structure for thermal shock resistance.
2. ​Leak-Free Guarantee: 100% eddy current testing and helium mass spectrometry for defect-free performance.
3. ​Custom Solutions: Thin-wall to thick-wall designs, orbital welding, and vacuum-insulated pipe (VIP) configurations.
4. ​Rapid Global Supply: Pre-certified stock in Dubai, Houston, and Rotterdam; 12-day lead time for cryogenic-grade orders.
5. ​Full Traceability: Mill test reports (MTRs), cryogenic impact test data, and compliance with LNG industry codes (BS 7777).

4. Key Applications

• ​LNG Infrastructure: Inner containment piping, vaporizers, and submerged combustion vaporization (SCV) systems.
• ​Aerospace: Liquid hydrogen/oxygen transfer lines for rocket propulsion and satellite cooling systems.
• ​Pharma Cryogenics: Ultra-cold storage for mRNA vaccines, biologics, and cell therapies (-80°C to -150°C).
• ​Industrial Gas Plants: Piping for argon, nitrogen, and CO2 liquefaction and distribution.

Engineered to withstand the most demanding cryogenic challenges, ASTM A358-certified stainless steel seamless pipes deliver unmatched safety, precision, and longevity for industries where ultra-low temperatures define operational success.

4. Key Applications

• ​Offshore Oil & Gas: High-pressure flowlines, risers, and umbilicals in sour (H₂S) reservoirs and deepwater fields.
• ​Subsea Systems: Corrosion-resistant piping for seawater cooling, chemical injection, and hydraulic control lines.
• ​Petrochemical Plants: Handling acidic crude, chlorinated solvents, and high-temperature process fluids.
• ​Desalination Units: Brine recirculation pipelines resistant to saltwater pitting and crevice corrosion.

Designed to endure the harshest operational demands, EN 10216-5-certified Duplex 2205 steel pipes deliver unparalleled safety, longevity, and cost efficiency in offshore energy, marine engineering, and heavy industrial sectors.JIANGSU CHINA STEEL UNION INDUSTRIAL CO.,LTD

Q1. What are your company's main products ?
A1: Our main products are stainless steel, carbon steel, galvanized steel, aluminium steel, ppgi steel products, including sheets, pipes, coils, strips, bars and channels.


Q2. What are the advantages of your company ?
A2: We guarantee that the quantity and specification of products are in full compliance with the standards of customer orders. We support any kinds of test. In addition, We also have more professional service and competitive price.

Q3. How do you control quality ?
A3: We provide Factory Test Report, also support Third Party Inspection.

Q4. How many coutries you already exported ?
A4: Exported to more than 50 countries mainly from Middle East, Russia, United States, Canada, Italy, Germany, Australia, Egypt, Chile, Mexico, Venezuela, Argentina, Kuwait, Saudi Arabia, UAE, Sri Lanka, Indonesia, Bangladesh, Turkey, India, etc.

Q5. Can you provide sample ? Do you support OEM ?
A5: Yes. Small samples in store can be provided for free. Customized samples will take about 2-3days.

Q6: What's your payment terms ?
A6: By T/T, L/C (30% deposit in advance, balance 70% before shipment), Western Union, Paypal, or Trade Online.