Uzhhorod pipe steel seamless cold-smoked, hot-smoked steel st20, st45 6-630 mm (Metallobaza) delivery, cutting

With the hot method, the cylindrical billet is heated in a furnace, then, in a hot form, it enters the piercing mill, where it is pierced and passes through the crimping rolls located at an angle. This is how a thick-walled sleeve is obtained, equal in diameter to the original blank, but 2.5-4 times longer. Rolling is carried out on an automatic, continuous or three-roll mill. The choice of equipment determines the characteristics of the finished product. At the final stage, the still hot pipe enters the sizing mill, cools down and undergoes stabilizing annealing to relieve residual stresses and strengthen the alloy structure. Cold deformation involves many operations. In production, pre-pierced sleeves are used, cleaned of scale, dried in a special chamber and coated with grease. Production by rolling or drawing is possible. Unheated steel changes shape slowly. The process is divided into several stages, after each heat treatment and etching are performed to remove oxides. The protective anoxic environment allows to reduce or eliminate the treatment with acidic compounds. The number of cycles is from 5 to 15. Then calibration, grinding inside and outside the pipe is performed. The surface of stainless steels can be polished to a mirror state. Hot-formed products have an outer diameter of 20-550 mm. with a wall thickness of 2.5-70 mm. Cold-formed - section diameter: 5-250 mm., wall: 0.3-24 mm. Seamless steel pipes, depending on the production method, have different purposes and properties. For some areas, it is possible to apply the standards of technical specifications, for example, in the manufacture of furniture or fences, hydraulic pressure parameters are not important. Pressing during hot deformation changes the structure of the metal, it becomes inhomogeneous. For some steel grades, stabilizing annealing or hardening is provided. Thick walls can withstand any pressure, both external and internal, are not susceptible to movement and soil mass. Hot rolled pipes are coated with scale, but if increased corrosion resistance is required, they are cleaned and zinc, chrome or polymer coating is applied. Seamless hot-rolled pipes are used in the construction of engineering networks, oil and gas pipelines, but they cannot be used to transport poisonous and explosive substances with a high hazard class, to supply water vapor. The strength of products is valued in construction. The advantage of cold rolled pipes is light weight, increased strength at the molecular level, polished surface reduces corrosion. For additional protection, they are treated with galvanic methods, powder paints, galvanizing, but stainless alloys are more often used. Cold-formed products have many purposes and sizes: rolling from some steel grades is used in marine shipbuilding; chemical and food industry; energy; instrument making; capillary tubes are used in dosing equipment, electronics, aviation. Seamless pipes are able to withstand a standard pressure of several hundred atmospheres, and work for a long time in networks with pressure drops. The hermetic construction is protected from the destruction typical of a welded joint, and is absolutely resistant to air pollution. The production of pipes using seamless technology is much more expensive than electric-welded pipes, so their use is due to economic feasibility. The selection is carried out on the basis of the normative pressure of the transported substance, the mechanical characteristics of structures or parts. Seamless steel pipes are pipes made of steel without welded joints. They are made by passing a round steel billet through a press and/or cylinder where it is rolled to form a seamless shape. This is a process known as cold forming. The advantages of seamless steel pipes are their strength, durability and the ability to be used in extreme conditions. They have higher resistance to pressure, vibration, corrosion and high temperature, which makes them an ideal material for oil and gas, power generation, offshore construction and other industries. The technology for the production of seamless steel pipes can be different depending on the requirements for products. The general process involves making a billet, passing it through a press or cylinder to make it seamless, and then working the pipe to give it the required characteristics. There are several production methods for seamless pipes, including cold and hot rolling, extrusion and forging. Seamless steel pipes are used in a variety of industries, including the oil and gas industry, energy, marine construction, automotive, engineering, and as a structural material for buildings and structures. They are widely used in gas pipelines, oil pipelines, steam pipelines, as well as in the production of drilling pipelines for t