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

The assortment and classification of seamless steel pipes are so extensive that it is easy to get confused in them. At the same time, in order to choose the right rolled products for specific production tasks, it is necessary to understand the basics: to know production technologies, the purpose of products and limitations in use. Otherwise, the budget may be spent inefficiently. Moreover, a seamless pipe is more expensive than analogues with seams due to its higher strength. We will talk about this and much more in the article. Seamless pipes are produced in two ways - using hot rolling and cold rolling. Both technologies are complex and costly. This is one of the reasons why seamless steel pipes are quite expensive. The product does not immediately enter the rolling mill. First you need to create a blank. For cold and hot rolling, they are made in the same way. To do this, use the following methods: Forging. pressing. Drawing. rolling. Further technologies differ. Hot rolling consists of the following steps: Preparations. The billet is heated to a temperature of 1180–1200 °C. Sleeve creation. Using a special mushroom drill, a large hole is made in the axial part of the workpiece. Now the product becomes more like a pipe. After the sleeve is sent to the rolling mill. Actually rolling. Here, the inner and outer walls of the product are clamped between two rotating rollers. This is how the diameter and wall thickness are adjusted. To adjust these parameters to the desired values, a special limiter is installed on the rolling mill. To fit the seamless pipe to the range, this cycle is repeated several times until a perfect result is achieved. Cold-rolled steel is characterized by a particularly smooth surface. In addition, the deformation of the workpiece here occurs without the use of high temperatures. Therefore, the technology consists of the following steps: Processing. For cold rolling workpieces are selected with great care. Then they are fired, pickled with acid. Next, you need to remove traces of these processes from the surface. To do this, the workpiece is treated with alkali. And only then does it undergo phosphating or copper plating. This is necessary to increase strength. Section formation. The pipe walls are clamped between two rotating rollers. This adjusts the wall thickness and diameter. The latter is changed by changing the angle of the rollers. Compressions. For him, the direction of movement of the pipe and rolls changes. This is how the achieved parameters of the product are fixed. There are two technologies for the manufacture of seamless pipes - hot and cold deformation of the metal. In both cases, the seamless pipe is made from a single piece of cylindrical metal alloy. production Seamless Pipe Manufacturing - Hot Rolling The production of a seamless metal pipe by the hot method consists of 3 cycles: Preform manufacturing. For the future pipe, a cylindrical blank is made of a metal alloy, which has a given length and cross section. Before rolling, the part is heated in special furnaces to a temperature of about 1200 degrees. Formation of a special sleeve for a future pipe from a billet. The sleeve is a centered semi-finished product with a hole along the axis of the future pipe. In a special machine, the sleeve is stitched along the axis, forming the initial hole. Now the part resembles a pipe, but with very thick walls and a small inner diameter. The rolling of the sleeve to the state of a pipe with the specified parameters is carried out at the last stage of the manufacture of seamless pipe material. Several different approaches are used here. During manipulations, the sleeve is pulled in a given direction between special rollers. All technological processes at pipe-rolling enterprises are automated. Each stage corresponds to special expensive equipment. The seamless pipe manufacturing process is energy intensive. Accordingly, at the output, the manufacturer receives a high cost of the finished product.