DIN2391 Cold Drawn Precision Steel Tube Black Phosphated Welded Hydraulic Steel Tubes are meticulously crafted components designed for high-performance hydraulic systems. These tubes, known for their precision and durability, undergo a specialized cold drawing process to ensure exceptional strength and resilience. The black phosphated finish not only enhances corrosion resistance but also provides a sleek appearance. With seamless welds and superior craftsmanship, these tubes deliver reliable performance in demanding industrial applications.

Steel tubes are manufactured according to technical specification of EN10305-2 Cold Drawn Welded Precision Steel Tubes DOM tubing, with steel grade of E155, E195, E235, E275, E355.

• GBK (+A) Annealed: After the final cold forming process the tubes are annealed in a controlled atmosphere.
• NBK (+N) Normalized (Mainly focus on): After the final cold forming process the tubes are annealed above the upper transformation point.
• BK (+C) Cold finished/hard (cold finished as drawn): No heat treatment after the last cold forming process.
• BKW (+LC) Cold finished/soft (lightly cold worked): After the last heat treatment there is a light finishing pass (cold drawing).
• BKS (+SR) Cold finished/stress relieve annealed: After the final cold forming process the tubes are stress relieve annealed.

• Professional, skilled & reliable service
• One step total solution
• Ready stock goods with fast delivery
• Customizable: Non-standard sizes available
• Small quantity orders accepted
• Refund or replacement for any product faults

• Widely used in mechanical treatment field, petrochemical industry, transport and construction
• Ordinary structural purposes and mechanical structural purposes in construction field, fulcrum bearing, etc.
• Transportation of fluids in projects and large equipment (water, oil, gas)
• Low and medium pressure boiler applications (steam tube, big smoke tube, small smoke tube, generating tube)