[Processing] D Qiqihar, a small diameter tube drawing small diameter cold drawn steel pipe manufacturer - macro Ye 
 The small-diameter cold drawn tubes: is used for mechanical structure, hydraulic equipment of high dimensional accuracy and surface finish to the small diameter cold drawn tube. Small-diameter cold drawn pipe must be cold-rolled, cold drawn or both. Cold drawing is usually in the 0.5 ~ 100T single chain or double chain drawing machine. Small-caliber high-quality cold drawn tube, mainly for the 10, 20 steel, to do the hydrostatic test in addition to ensuring the chemical composition and mechanical properties, curling, flaring, flattening test. 
 Solid tube and clear upon inspection of surface defects cut into desired length in the tube perforated end to end surface of the centering, and then sent to the furnace heating puncher perforation, the perforation of continuous rotation and forward, in the roll and the head of under the action of the tube internal gradually formed a cavity known as the capillary, and then sent to the automatic rolling machine continued rolling and finally by the machine are the entire wall thickness sizing, sizing machine, to specifications, the use of continuous pipe mill producing hot-rolled small-diameter cold drawn tube is a more advanced method Ruoyu get smaller and better quality of small-diameter cold drawn pipe must be cold-rolled, cold drawn, or the combination of the two methods of cold-rolled usually in two-roll mill small-diameter cold drawn tube of variable cross-section hole slot and fixed cone head in the ring pass rolling, cold drawing is usually in a single chain or double chain drawing machine is about to heat extrusion method good tube moving with the perforated rod within the cylinder and squeeze the lever on the closed extrusion, extrusion extrusion from the die hole of smaller, this method can produce small-caliber tube drawing. 
 Steel pipe weight formula: [(OD - Wall Thickness) * Wall thickness] * 0.02466 = kg / m (per meter weight) 
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