Specifically engineered for high-pressure gas storage, our seamless cylinder tubes are manufactured from premium carbon and alloy steels via hot-rolled or cold-drawn processes. These tubes offer high strength, excellent toughness, superior fatigue resistance, and good weldability. Widely used in industrial gas cylinders, LPG, CNG, hydrogen tanks, firefighter breathing apparatus, and various high-pressure storage systems, they ensure safe and reliable performance under cyclic pressure and demanding service conditions.
Key Features
Standards:
International: ISO 9809-1/-2 (Gas Cylinders – Refillable Seamless Steel Cylinders), EN 10305-4 (Precision Seamless Steel Tubes – Part 4: Seamless Steel Tubes for Gas Cylinders).
Domestic: GB/T 18248 (seamless cylinder tubes), GB 5099 (Seamless Steel Gas Cylinders), TSG 23 "Safety Technical Rules for Gas Cylinders".
Others: DIN 1629, JIS G3429 (Seamless Steel Tubes for High-Pressure Gas Containers).
Materials:
Carbon Steel: 20, 45, Q345B, Q345D, 25Mn, E355, 27SiMn, E470/20MnV6, 37Mn, 34Mn2V, 30CrMo, ST35.8, ST45.8.
Low-Alloy High-Strength Steel: 37Mn30CrMo, 35CrMo, 42CrMo, 30CrMnSiA, 30CrMoE, 42CrMoE, 4130X, 4135X, 4142X, 4145X, 4147X, 34CrMo4;20MnTiB, S700, S89030Mn2, 35CrMo, 4130, 34CrMo4 (ideal for CNG and hydrogen cylinders).
All materials meet strict chemical composition and purity requirements, ensuring low non-metallic inclusions and uniform microstructure.
Dimensions:
Outer Diameter (OD): 89 mm – 426 mm
Wall Thickness (WT): 4 mm – 30 mm
Length: Fixed (e.g., 5.8m, 6m, 12m) or custom (up to 18m per drawing)
Applications:
Manufacturing high-pressure gas cylinders (oxygen, nitrogen, argon);
LPG and CNG vehicle tanks;
New energy: High-pressure hydrogen tanks for fuel cell vehicles (Type III/IV liner support);
Firefighter SCBA cylinders, diving cylinders, medical gas containers.
Certifications:
Classification Society Approvals: Factory-approved by ABS, BV, DNV, LR, NK, CCS, RINA – suitable for marine and offshore high-pressure gas systems.
End-User & Engineering Company Qualifications: Approved supplier for Air Liquide, Linde Engineering, Air Products, Ningbo Jiahua, Beijing Tianhai, Zhejiang Hexie, Hanon Systems, Hyundai Mobis, and other leading global cylinder manufacturers.
Quality System Certifications: ISO 9001, ISO 14001, ISO 45001, PED 2010/35/EU (CE Marking), TPED support, API Q1.
Special Approvals: Some products support ADR (European Agreement concerning the International Carriage of Dangerous Goods by Road) and DOT (U.S. Department of Transportation) testing compliance.
Common Customer Questions (Q&A Format)
Q: Which standards do your cylinder tubes comply with? Are they internationally recognized?
A: Mainly GB/T 18248, ISO 9809-1/-2, EN 10305-4, JIS G3429 – fully compliant with global gas cylinder safety and design codes.
Q: Can you supply high-strength alloy tubes for CNG or hydrogen cylinders, such as 34CrMo4 or 37Mn?
A: Yes, we mass-produce 37Mn, 34Mn2V, 34CrMo4, 4130X – specifically designed for high-pressure cylinders with tensile strength up to 750–950 MPa or higher.
Q: What are your minimum and maximum tube sizes?
A: Standard OD: 89–426mm, WT: 4–30mm – suitable for portable bottles to large vehicle-mounted gas storage systems.
Q: Do you have classification society approvals? Can your tubes be used on ships?
A: Yes, approved by ABS, BV, DNV, CCS, etc., for use in marine LPG/CNG systems and offshore platform gas supply units.
Q: Are you qualified by major cylinder OEMs like Linde or Air Products?
A: Yes, we are an approved vendor for several global leaders in cylinder manufacturing and supply their OEM and export projects.
Q: What is the typical lead time? Do you have stock for common sizes?
A: Standard lead time: 25–45 days. Common sizes (e.g., Φ159×8 37Mn, Φ219×10 34CrMo4) are in stock for fast delivery.
Q: Do you provide full mechanical and NDT test reports?
A: Yes, each batch includes chemical analysis, tensile, impact, flattening, flaring, ultrasonic testing (UT), and hydrostatic test reports. Third-party reports from SGS, BV, or customer-nominated labs are available.
Q: Can you customize production based on drawings or technical specs?
A: Yes, we support custom orders including specific heat treatments (normalizing, normalizing + tempering, quenching & tempering) to meet final cylinder performance requirements.
Q: Are your tubes suitable for hydrogen fuel cell vehicles? Do you have technical readiness?
A: Yes, our 34CrMo4 and 4130X high-strength alloy tubes are used in Type III hydrogen tank liners, with mature production and inspection capabilities.
Q: What is your export packaging? Does it meet international shipping standards?
A: Packaged with rust-proof paper, plastic end caps, hexagonal bundling or wooden crates. Clear labeling (material, size, batch, standard). Complies with sea/land transport and ADR hazardous goods packaging requirements.
Hot Tags: seamless cylinder tubes, China seamless cylinder tubes manufacturers, suppliers, factory, 30Mn2 clinder pipe, 34CrMo4clinder pipe, LSAW PIPE, Offshore Structures Pipe, Seamless tubes for offshore structures, steel pipe weld fittings
