Welded Cold Drawn or Cold Rolled Precision Steel Tube   Product Information   Product standards: EN10305-2, DIN 2393, ASTM A513   Dimentions: Outside diameter: 18 – ​120 mm (0.709 – ​4.724”) Wall thickness: 1.0 – ​7.5 mm (0.039 – ​0.295”)   Main products: automobile engine parts, hydraulic cylinder tubes for machinery equipment   Straightness: a) ReH≤500MPa，the curvature is 0.0015 L b) ReH>500MPa，the curvature is 0.002 L   Lengths: The usual length of steel tube is 3000mm~8000mm. According to the demand of the buyer, and after negotiation between the supplier and the buyer, steel tube of other lengths can be produced.   Delivery Status: Cold working/hard state: +C Cold working/soft state: +LC Stress relief annealing state after cold working: +SR Annealing state: +A Normalizing state: +N   Customer Benefits: High dimensional accuracy for inside and outside diameters Extremely limited wall thickness tolerances Reduced eccentricity Smooth drawn surface Increased strength values due to cold forming Tightly staggered range of dimensions Customized heat treatment