Fluid tube on the hydraulic system in the domestic national standard is close to the standard GB3639-83. The hydraulic pipe is introduced: the size of the hydraulic equipment of high precision and good surface finish of cold drawn or cold rolled precision seamless steel tube. Choose precision seamless steel pipe manufacturing mechanical structure, or fluid
Pressure equipment, precision steel tube by Precision steel tubes cold drawn or cold rolled from a high precision seamless steel tube.

Because of the precision steel tube inside and outside wall without oxidation layer, under high pressure without leakage, high precision, high finish, cold bending deformation, flaring, flattening without ****s a bit, it is mainly used to produce pneumatic or hydraulic products.

In the standard DIN2391-1. Hydraulic pipe after finishing, no oxidation bright heat treatment of raw materials (NBK), nondestructive testing, steel pipe inner hole through high pressure washing, pickling, block on both ends of the steel tube inside and outside wall with anti-rust oil antirust processing, used as a dust
To deal with.

To produce steel pipes with high precision, finish good, tube inside and outside wall without oxidation layer, steel pipe can bear the high pressure of fluid flow through, and the steel tube cold bending deformation, flaring, flattening without ****s. Mechanical properties can be bent under any Angle
No deformation. Mainly used for oil in the hydraulic system of the Precision Welded pipes compound steel pipe, also called hard pipe in the hydraulic system, automotive precision steel tube, specifications for outside diameter (D) Φ commonly 4 mm - 76 mm, thickness 0.5 mm to 6.0 mm (S).

Cold drawing processing steel tube is work hardening. The cold drawing metal plastic deformation occurs, the crystals have multiple slip system startup, internal dislocation motion intercept each other, many dislocation were pinning and dislocation caused by product and dislocation source to stop the action at the same time. The above.

A series of process results in the decrease of the dislocation mobility, crystals in dislocation density increased significantly. When plastic deformation occurs, further stress increase and enough to make stainless steel 304 pipes pinning dislocation movement, screw dislocation glide, edge dislocation cannot pay slip, so that the hair
Dislocation cross section, increase the fixed order.

So by cold drawing processing metal internal dislocation density increases, the dislocation mobility is reduced, is difficult to produce dislocation and difficult to mobile dislocation, and hardness, strength, improve the metal materials. This is the metallography principle of cold drawing process.