Cold Drawn Seamless Tubes

Recently, the domestic steel market decline in overall volatility, including long-term material fell sharply. Steel market demand into the off-season, engineering construction. Manufacturing requirements significantly reduced; Short-term weak hard to change.
Compared with other welding technology, precision steel tube welding welding has many advantages, mainly: because reflect exothermic reaction, raw materials only heat up to less than the temperature of melting point hundreds of ℃, it can save resources. Precision steel tube welding welding for data to carry out the surface treatment. Precision steel tube welding welding can be carried Cold Drawn Seamless Tubes out of China - - porcelain, ceramic, metal materials - metal welding welding of metal materials. Because he was born embryos can be pressed into casual appearance, so precision steel pipe welding welding welding easily make it not easy to manufacture goods. Precision steel tube welding welding parts of exothermic reaction in the process of operation, can reduce thermal injury zone, to prevent the destruction of thermistor materials for external economic institutions, maintaining the characteristics of the raw materials. Welding welding is to generate the gradient direction of raw materials, as a welding material to electric welding welding special raw materials, to get rid of the original material in organic chemical, and mechanical properties of structural mechanics do not match. Can be added to improve phase in the welding materials, such as reinforcing particles, polyester staple fiber, whisker, etc., to form a composite material.
Quilting tube by rolling processing. Due to surface layer have residual pressure stress, help to closed surface cracks, prevent the expansion of the corrosion. So as to improve the corrosion resistance of the surface and to delay the generation of fatigue crack or expand, so as to improve the fatigue strength of quilting tube. Through the rolling forming, cold rolling surface hardening stainless steel tube 304 layer, reducing the grinding pair of elastic and plastic deformation of the contact surface, improve the wearability of quilting tube wall, avoid caused the grinding burns. After rolling, the surface roughness value reduction can improve coordination. Rolling processing is a kind of a chip machining, metal plastic deformation at room temperature, the surface micro roughness not to change the surface structure, mechanical properties, the purpose of the shape and size. Therefore, the method can achieve the purpose of optical processing and reinforcement at the same time, this is grinding out of the question. Regardless of what kind of machining method, the workpiece surface is always slightly uneven scar, peak valley crisscross ups and downs.
Rolling processing principle: finishing machining is a kind of pressure, using cold plastic deformation characteristic of the metal at room temperature, using the rolling tool exert some pressure on the surface, make the surface of metal workpiece produces plastic flow, fill to the original residual dips in the valley, reduce the surface roughness value. Due to the plastic deformation of metal in the rolling surface, surface cold hardening, grain refinement, density of fiber formation, formation of residual stress layer, improve the hardness and strength, improve the surface wear resistance, corrosion resistance, and coordination. Rolling is a kind of no cutting method of plastic processing.
In general case, the price is will be very expensive. This problem has been, and constantly to the precision of steel tube, has been completely solved. Why precision steel tube, has such functions? That is completely because of the precision steel tube, specifications can be deviation, control within a certain category. Because any a kind of seamless steel tube in the thickness aluminium coated tubes of the steel tube, and the oval, bending degrees level, can guarantee that 100% of the limit. Other types of seamless steel tube, only can guarantee that the deviation in the field of the pipeline is reduced. But precision steel tube is different, make the specification of this kind of line, requires the deviation, cannot exceed the size tolerance. If don't conform to the standard, it is not pass the seamless steel tube. If the customer does not have very rules, then the pipe wall thickness, oval, bending degrees of deviation, cannot exceed the size tolerance of 80. If you of the specifications of the on line, it is high precision.