The defects can be removed by grinding with sand wheel, but the remaining wall thickness must be within the allowable standard.Pass designTrianfo port,The use of hot dip galvanizing has expanded with the development of industry and agriculture. Therefore, hot-dip galvanized products have been widely used in industry (such as chemical equipment, petroleum processing, marine exploration, metal structure, power transportation, shipbuilding, etc.), agriculture (such as sprinkler irrigation, heating room) construction (such as water and gas transportation, scaffold, house, etc.), bridges, transportation,Trianfo portWhich software is good for steel bar turning,Trianfo portWhere is 40CrMo seamless pipe, etc. because hot-dip galvanized productsWith the development of steel structure buildings, only I-beam is not enough, that is, thickened I-beam, which is easy to lose stability for load-bearing columns.Larmern, The defects can be removed by grinding with sand wheel, but the remaining wall thickness must be within the allowable standard. Frame line crack Remove defective pipes within the allowable length.

Plan option : Martensitic chromium alloy pipe, Phosphorus: it can significantly reduce the plasticity and toughness of steel, especially at low temperature. This phenomenon is called cold brittleness. In high-quality steel, sulfur and phosphorus should be strictly controlled. On the other hand, low carbon steel contains high sulfur and phosphorus, which can make it easy to cut, which is beneficial to improve the machinability of steelBecause all parts of I-beam are arranged at right angles, simple construction, cost saving and light structural weight in all directions,Trianfo portPrice of 12Cr1MoV alloy pipe, 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, 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, so it is also named wide edge I-beam.property right,The shape of small longitudinal crack on the surface of alloy pipe is less than mm The overall width is less than mm The depth is lower than .mm.According to the theory of steel structure, the I-beam flange should be stressed, that is, the I-beam should be standing rather than lying down.The crack mainly occurs at -mm from the edge of the alloy pipe. The shape is several parallel vertical cracks of different sizes. The regularity is that the thicker the specification and model of the alloy pipe is The wider the width, the more serious the disadvantages.

Classification introductionQuality management,In order to make the welded pipe have the required mechanical, physical and chemical properties, in addition to the reasonable selection of materials and forming process, heat treatment process is often necessary. In addition, the mechanical, physical and chemical properties of aluminum, copper, magnesium titanium and their alloys can be changed by heat treatment to obtain different service properties. Main machines and toolsThe flange of H-beam is of equal thickness, including rolling section and combined section composed of three plates welded. All I-beams are rolled sections. Due to poor production technology, the inner edge of the flange has a slope of : The rolling of H-beam is different from that of ordinary I-beam. Only one set of horizontal rolls is used. Because its flange is wide and has no inclination (or the inclination is very small), a group of vertical rolls must be added for rolling at the same time. Therefore its rolling process and equipment are more complex than ordinary rolling mills. The maximum height of rolled H-section steel that can be produced in China is mm, which exceeds the welded composite section.Trianfo portDue to the relatively high and narrow section size of ordinary I-beam and light I-beam, the moment of inertia of the two main sleeves of the section is quite different, which makes it very limited in the scope of application. The use of I-beam shall be selected according to the requirements of design drawings.→ under the same section load, the weight of hot-rolled H steel structure is reduced by % - % compared with the traditional structure.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), and the solution time is min.