Cold rolling of seamless steel pipe is to transform martensite into seamless steel pipe before the rolled piece enters the precision extrusion equipment. Cold rolling and nitriding technology knowledge of seamless steel tubes. Rough rolling is still carried out under full martensite conditions. Then, according to the ultra fast cooling system between the finishing mill and the roughing mill, the temperature of hot rolled strip steel is reduced below, and then it enters the first finishing mill.
The nitriding treatment method of seamless steel pipe mainly adopts nitriding furnace, cold rolling and nitriding technology knowledge of seamless steel pipe, puts the seamless steel pipe into the material rack, and then lifts the product to the furnace bottom for heating. In addition, the nitriding furnace with the design scheme of furnace door lifting load can be made, and the workpieces of wall hanging products can be heated according to the special tools for lifting and wall hanging. The nitriding furnace shell is generally driven by a decelerating motor with an electric fully automatic elevator. After the furnace cover is closed, another clamping anchor bolt ensures the sealing of the vacuum pump of the nitriding furnace. First, vacuum packaging, and then nitrogen for heat treatment nitriding process.
Nitriding treatment of seamless steel pipe refers to a heat treatment method of organic chemical heat treatment of products by certain substances at a certain temperature. It is of great practical value to apply the nitriding furnace to the steam nitriding heat treatment of various steel mechanical parts, car curved glaze, transmission gears, motorcycle brake pads, molds, etc. In terms of color plate, air conditioner copper pipe, copper coin, copper core wire and copper bar can be used for bright airless oxidation quenching in maintenance atmosphere. Or the airless oxidation quenching heat treatment method used by vacuum pump N2 on thick wall seamless tubes, short shafts and various metal materials.
Obviously, because the heating temperature of the cold rolled slab in the seamless steel pipe area is lower than that of the basic cold rolling, the cold rolling and nitriding technology knowledge of the seamless steel pipe greatly reduces the heating energy consumption and improves the output of the heat treatment furnace. Low temperature can also reduce the heating rate of hot rolled strip steel, thereby reducing the fatigue cracking and fracture caused by internal stress, and reducing the wear of hot rolled strip steel; Ultra low temperature cold rolling can also reduce the generation of secondary zinc ash, improve the technological performance of hot rolled products, and improve the running rate of pickling and passivation lines. The actual production verification shows that the cost of products can be greatly reduced by replacing the traditional cold-rolled and quenched hot rolled sheet with the hot rolled sheet produced in the seamless steel pipe area.