Import Cng Cylinder Pipes — Buy in Bulk from Supplier in China

Tubes China Co., Ltd supplies seamless steel pipes for CNG cylinder manufacturing, made from alloy grades including 34CrMo4, 4130X, 37Mn, and 34Mnv2. These pipes are cold-drawn or seamless extruded to precise outer diameters and wall thicknesses, designed to be formed into high-pressure cylinders. The material selection ensures high tensile strength and resistance to hydrogen embrittlement under sustained pressure.

The pipes are manufactured to dimensional tolerances of ±0.05 mm for diameter and ±5% for wall thickness, consistent with ASTM A519 and EN 10305 standards. Internal surfaces are honed to a Ra < 0.8 µm to reduce friction and prevent gas contamination. Each batch undergoes ultrasonic testing to detect internal laminations or inclusions. The material chemistry is controlled to limit sulfur and phosphorus levels below 0.025% to enhance toughness.

These pipes are used by CNG cylinder manufacturers in China, India, and Eastern Europe for producing Type-1 and Type-2 cylinders. Buyers include industrial component fabricators and OEMs supplying public transport fleets. Packaging is in steel-reinforced wooden pallets with rust-inhibiting oil coating. Minimum order quantities start at 5 metric tons per grade. Delivery terms are typically FOB Shanghai or CIF to major ports, with lead times of 6 to 8 weeks after order confirmation.

Tubes China Co., Ltd is registered in Zhangjiagang, Jiangsu Province, with a physical address on Renmin Road. The company is listed as an imported supplier with harbor-level trust verification. No factory photos, production capacity, or workforce size are disclosed. The listing does not state years in business, certifications, or client names. Response metrics show zero recorded response rate and zero average response hours.

The supplier appears to operate as a trading company sourcing seamless pipes from third-party mills. There is no indication of in-house heat treatment, testing, or finishing capabilities. Buyers should request mill test reports for each batch and verify material traceability. All claims about material grades and standards are based solely on the listing and require independent confirmation.