Carbon Steel Precision Pipes

Carbon steel precision pipes are cold-drawn / cold-rolled seamless carbon steel tubes with ultra-tight dimensional tolerances, smooth bright surface, consistent wall thickness and uniform mechanical properties. They are processed by precision cold working, annealing and finishing, for high-precision mechanical structures, hydraulic systems, automotive parts, instrumentation and high-precision fluid conveyance.

• Manufacturing process: Cold drawn, cold rolled, bright annealing, stress relief
• Surface type: Bright finish, polished, oiled, phosphated, black finish
• End type: Plain end, deburred end, cut-to-length, flanged, threaded (customizable)
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Main Executive Standards

• DIN 2391: Seamless precision steel tubes for hydraulic and pneumatic systems
• EN 10305-1: Cold drawn seamless precision steel tubes for technical applications
• EN 10305-4: Precision steel tubes for hydraulic cylinder applications
• ISO 8535: Seamless precision steel tubes for hydraulic fluid power systems
• ASTM A519: Seamless carbon and alloy steel mechanical tubing
• ASTM A512: Cold-drawn buttweld carbon steel mechanical tubing
• ASTM A822: Seamless cold-drawn carbon steel tubing for hydraulic service
• BS 6323: Specification for seamless and welded steel precision tubes
• JIS G3445: Carbon steel tubes for machine structural use
• GB/T 3639: Cold drawn or cold rolled precision seamless steel tubes

3. Material & Grades

Common Carbon Steel Grades

• European / DIN: ST35, ST45, ST52, E215, E235, E355, S235JR, S355JR
• Chinese: 10#, 20#, 35#, 45#, Q235B, Q355B
• American: SAE1010, SAE1018, SAE1020, A106 Gr.B, A53 Gr.B
• Japanese: STKM11A, STKM13A, STKM19A

Typical Mechanical Properties (E235 / 20#)

• Yield Strength: ≥235 MPa
• Tensile Strength: 340–480 MPa
• Elongation: ≥25%
• Delivery condition: Soft annealed (BK+S), normalized, stress relieved
• Tolerance: OD tolerance ±0.05~±0.1mm, WT tolerance ±0.05mm (custom high precision available)

 Basic Parameter Reference Table