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

Seamless steel pipes are the most durable among other tubular products. The solid wall, along with the nature of the metal, provides pipelines with exceptional capabilities - they operate in harsh conditions of high temperatures and pressures. Seamless steel pipes are expensive products, for the production of which special equipment and technologies are used. Features of seamless pipes Seamless pipes are produced from steel - a high-strength alloy of iron and carbon, which has hardness and resistance to external influences. The absence of a seam and thick walls put this pipe material out of the competition. Seamless steel ruba is a product of continuous pipe metal-roll, which is produced on special pipe-rolling mills. It has significantly higher resistance to external influences, strength and reliability than similar welded structures. Despite the spread of polymer products, it is still in demand in the construction of pipelines, construction, mechanical engineering and other areas. Seamless pipes have high strength characteristics and are in demand in a variety of industries. How seamless pipes are made Industrial enterprises produce seamless pipes using various combinations of metals and alloys, depending on the purpose of the product. Production is carried out by four main methods: Products used as starting material for hot-formed pipes can be: Seamless hot-formed steel pipe is produced by performing several technological operations. At the initial stage, the rod, which is round in cross section, is converted into a sleeve. This is done using presses or special mills with mushroom-shaped, disk or cone rolls. The workpiece is guided along the axes, processing is performed by working tools rotating in one direction, located in a vertical plane with an inclination of 4-12º. During the processing of the workpiece, its cross-sectional area is reduced and a small hole is formed in the axial part. One of the ways to produce seamless pipes is the hot rolling method. A special mandrel installed between the rolls corrects the dimensions of the product opening and levels its surface. At the same time, the workpiece is held in the required position by special guide rulers and non-wire rollers. Conducting the initial heating of the workpiece to 50º C, it is given the plasticity required for processing. On the rolling mill, the dimensions of the finished sleeve are adjusted again. Before transfer to the final running-in, it is given the parameters of thickness variation and ovality. After that, the product is on a continuous hot rolling mill, from where it enters the cold calibration Cold-formed products, which are of high quality, are carefully processed. Even at the stage of preparation, a careful selection of blanks is carried out. Further preparation for processing includes the annealing procedure. After annealing, the raw material is sent for pickling - acid treatment. To neutralize the effects of etching and clean it from its residues, the pipe is treated with an alkaline solution, and then dried. To further improve the properties of the pipe, phosphating or copper plating is carried out. On a rolling mill, composed of a rolling stand and two rolls located at a given angle and rotating in opposite directions, a caliber is formed. The dimensions of the caliber in the direction of increase or decrease are set by changing the angle of inclination of the rolls. When moving the rolling stand to the workpiece being processed, the latter is between the rolls. And when the direction changes, compression occurs. In the process of one rolling change such dimensions as the size of the diameter and wall thickness of the pipe. When producing thin-walled products, the process is duplicated, again annealing and pickling the workpiece. This is followed by the final finishing of the product. Cold formed pipes are called cold rolled. Classification of seamless steel pipes Products are distinguished, first of all, by the method of pipe rolling, depending on what they can be: GOST sets the possible dimensions of pipes produced, and the weight indicators of a seamless pipe depend on its diameter and wall thickness. With regard to length, it is distinguished (data are indicated only for thick-walled pipes): The ratio of the dimensions of the outer diameter and wall thickness sets the division of seamless products into three types. They can be: The range of seamless pipes includes products with thick and extra thick walls. Thick-walled and extra-thick seamless pipes are usually subjected to additional heat treatment to give additional resistance to the pressure of the working environment of the main pipeline or other communications. According to quality characteristics, hot-rolled seamless products are divided into five groups, denoted by letter indices: Steel pipes are divided into six classes, based on the purpose of the product: Seamless pipes are used in the construction of