GB/T3639 Steel Pipe

As an established seamless steel tube manufacturer with 21 years of specialized experience, Tenjan produces GB/T 3639 precision seamless steel tubes that represent the pinnacle of cold-drawn and cold-rolled manufacturing technology. Our precision cold-finished tubes are engineered for applications demanding exceptional dimensional accuracy, superior surface quality, and consistent mechanical properties, serving global clients in hydraulic systems, precision machinery, and automotive manufacturing with cost-effective solutions that rival international standards in quality and performance.

Define whether outside diameter, inside diameter or wall thickness controls the component, then state length, straightness, ovality, surface and end requirements. GB/T 3639 precision tube orders should also identify the required cold-finished and heat-treatment condition.

• Functional dimensions and inspection locations
• Delivery condition and mechanical-property requirements
• Critical outside or bore surface
• Material certificate and optional non-destructive testing

Grade, size and condition are confirmed against the current drawing and production quantity. When an alternative grade is proposed, chemistry, strength, ductility, weldability and downstream heat treatment should be approved together.

GB/T 3639 cold-drawn or cold-rolled precision seamless tube is considered for hydraulic, pneumatic and mechanical components where dimensional control can reduce machining. Share bending, flaring, honing, welding or plating operations so the supplied condition supports the complete process.