DIN1630 ST37.4 Precision Black Phosphated Hydraulic Tube For Automobile

DIN1630 ST37.4 Precision Black Phosphated Hydraulic Tube For Automobile

Specifications:

Size:OD4mm-60mm,TH0.5mm-7mm

Standard:DIN1630

Material: ST35,ST37.4,ST37,ST45,ST52,ST52.4,

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.

Main Features: color of steel tube: bright black. Color is homogeneously distributed on the tube surface. The tube has good property of antirust.

Chemical Composition for Hydraulic Steel Tubing