Welded steel pipes need to be processed through various processes before application. The heat treatment of welded steel pipes is a very important link in the processing of welded steel pipes. Hot working is a metal hot working process in which metal materials are heated insulated and cooled in a certain medium, and their metal properties are controlled by changing the metallographic structure on the surface or inside of the material. During the heating and cooling process of structural welded steel pipe workpiece, due to the inconsistency of cooling speed and time between the surface and the core, the temperature difference will be formed, which will lead to uneven volume expansion and contraction and produce stress that is, thermal stress.On the other hand, when the steel structure changes during heat treatment, that is, austenite transforms into martensite, the increase of specific volume will be accompanied by the expansion of workpiece volume, and each part of workpiece will undergo phase transformation successively, resulting in inconsistent volume growth and structural stress. Due to the change of tissue stress the tensile stress on the surface and the compressive stress in the heart are just opposite to the thermal stress. The magnitude of microstructure stress is related to the cooling rate, shape and chemical composition of martensitic transformation zone materials.Pass designLet's see,At present, there is still a big gap in the production technology of C-section steel between China and foreign countries.The production process can be summarized as follows: pre leveling → finishing → straightening → post leveling. Flat steel / A / B steel with width of -, thickness of -, rectangular section and slightly pure edge. Flat steel can be finished steel, or it can be used as blank for welded pipe and thin slab for laminated thin plate.Plan scheme : Martensitic chromium alloy pipe and chromium alloy pipe with Cr composition exceeding %, without high carbon steel and high chromium alloy pipe. The aqueous solution contains % sodium cyanide % ~ % (volume ratio), the solution temperature is ~ ℃, and the solution time is min.
When selecting I-beam in structural design, reasonable I-beam shall be selected according to its mechanical properties, chemical properties, weldability and structural size.Installation requirements, Small longitudinal crack Tungsten; can improve the red hardness and thermal strength of steel, and can improve the wear resistance of steelBecause all parts of I-beam are arranged at right angles I-beam has the advantages of strong bending resistance,Monte Carlo15CrMo thick wall alloy pipe, simple construction, cost saving and light structural weight in all directions, and has been widely used. The inner and outer sides of the flange of the I-beam are parallel or close to parallel, and the end of the flange is at a right angle,Monte CarloSuperalloy tube GH5188, so it is named parallel flange I-beam. The web thickness of I-beam is smaller than that of ordinary I-beam with the same height of web, and the flange width is larger than that of ordinary I-beam with the same height of web, so it is also named wide edge I-beam.Monte Carlo,What is nitriding of alloy pipeMetallization: refers to the process of penetrating metal atoms into the surface layer of alloy steel pipe. It is to alloy the surface layer of steel so that the workpiece surface has the characteristics of some alloy steel. Aluminizing, chromizing, boronizing, siliconizing and so on are commonly used in production.Function of I-beam: where is I-beam mainly used?
Very good buyer. Thank you. My colleagues like it very much Monte Carlo2520 stainless steel seamless pipe manufacturer. Come again next time
The manager is nice! Monte Carlo2520 stainless steel seamless pipe manufacturer is also real.
In anticipation, I finally waited for my beloved Monte Carlo2520 stainless steel seamless pipe manufacturer, I wish the boss a prosperous business and wealth!
Monte Carlo2520 stainless steel seamless pipe manufacturer Tell me a price, is there a detailed price for the parameter?
Sure enough, you get what you pay for, Monte Carlo2520 stainless steel seamless pipe manufacturer is super good, the quality is very good, thank you!
Monte Carlo2520 stainless steel seamless pipe manufacturerYes, give you a good comment