Small Diameter Hydraulic Steel Tubing , Black Round Cold Drawn Seamless Pipe

Small Diameter Hydraulic Steel Tubing , Black Round Cold Drawn Seamless Pipe

Specifications:

Size:OD12xWT2,OD10xWT1.5,OD10xWT1,OD8xWT1,OD8xWT1.5.

Standard:DIN1630/EN10305-4 /DIN2391/C

Material: ST35,ST37.4,ST37,ST45,ST52,ST52.4,E235,E255,E355,SAE1010,SAE1020.

Delivery State:NBK+Black phosphate.

Features: 

• Surface Anti-rust:good property of antirust,both outside and internal tube surface flushing with anti-rust oil.
• Surface Color: Bright black color is homogeneously distributed on the tube surface.
• Surface quality:very smooth without oxide scale,pock,strach,crack and other defects..
• Surface Cleaness:clean without iron scrap,dust,better for hydraulic system life.
• Mechanical properties:better extending rate and strength property,after bending with no deformation,after flattening and flaring process with no crack.
• Raw material: Precision tubes are made from carbon steel from quality Bao Steel,XingCheng Steel,and HuaiSteel.
• Testing:Tensile strength,Flattening and Flaring test,Water pressure test,composition analyse test.

Synopsis of Process Routing: Cold drawn and bright NBK seamless steel tube is used as the tube to be phosphated. The phosphated is realized with the imported chemical fluid to form a black film. The antirust oil is absorbed by means of the micro pore on the film to prevent from the rust. The caps are covered at two ends of tube to prevent from the dust.

Internal Surface quality Control:We adopt automatic inner surface cleaning machine, rotating brush cleaning and high pressure oil flushing to clean the inner and outer surface.The new steel tube production craftsmanship can effectively remove all particulate attached to the inner and outer surface of tubes and thus achieving the utmost surface cleaness and polishness.

Chemical Composition for Hydraulic Steel Tubing