Commonly used brand: 10 #, 20 g, Q345, movnb Q390, 10, 12 crmo, 15 crmo, 12 cr2mo
Commonly used foreign standards: ISO 9329-2-19 97
ASTM A161-94
General seamless steel tube production process can be divided into cold drawing and hot rolled, cold rolled seamless steel tube production process generally more complicated than hot rolled, three-roll rolling billet must first, after the extrusion sizing test, if there is no response after the crack on the surface of pipe have to be cut after cutting machine, cutting growth degree about one meter of billet. Then enter the annealing process, annealing with acid pickling liquid, pickling must pay attention to the surface to see if there is a large number of bubbles produced, if there is a lot of bubbles that steel tube quality is not up to the standard of the response. Appearance shorter cold rolled seamless steel pipe in hot rolled seamless steel pipe, cold rolled seamless steel tube wall thickness generally smaller than hot rolled seamless steel tube, but looks more bright than thick wall seamless steel tube surface.
· Trust
Quality and timeliness are our greatest priorities to gaining trust. We continuously improve our internal process for quality assurance and logistics in order to exceed your expectations.
Quality and timeliness are our greatest priorities to gaining trust. We continuously improve our internal process for quality assurance and logistics in order to exceed your expectations.
