Hot-dip galvanized square pipe has good strength, toughness, plasticity and welding process performance and good ductility, and its alloy layer is firmly attached to the steel base, so hot-dip galvanized square pipe can be cold punched, rolled, and drawn. , bending and other forming without damaging the coating; suitable for general processing such as drilling, cutting, welding, cold bending and other processes. The surface of the hot-dip galvanized parts is bright and beautiful, and can be directly used in engineering according to requirements.

Galvanized metal Square tube for sale 50*50*5*6m, expressed as: 50(width)*50(width)*5(wall thickness)*6m(meters). Because the square tube is equilateral, that is, the commonly used meter is 6 meters; the general industry is simply expressed as: 50*5 square. According to the representation method of square tube, the side width and wall thickness of square tube are generally used as the standard.

Hot-dip galvanized square pipes are generally judged by the appearance of the product. If there are leakage plating, pitting, white spots, heavy skin, air bubbles, greening on the outer wall surface of the square pipe, and the frequency of occurrence is too high, it will be judged as an unqualified product. However, in the product standard, there is a specified range for the deviation of the product, that is, the "allowable deviation" of the size

Galvanizing refers to the surface treatment technology that coats a layer of zinc on the surface of metal, alloy or other materials to play the role of beauty and rust prevention. The main method used is hot-dip galvanizing.

Zinc is easily soluble in acid and alkali, so it is called amphoteric metal. Zinc hardly changes in dry air. In humid air, a dense basic zinc carbonate film is formed on the zinc surface. In the atmosphere containing sulfur dioxide, hydrogen sulfide and marine, the corrosion resistance of zinc is poor, especially in the atmosphere containing organic acid at high temperature and high humidity, the zinc coating is easily corroded. The standard electrode potential of zinc is -0.76V. For the steel substrate, the zinc coating is an anodic coating, which is mainly used to prevent the corrosion of steel, and its protective performance has a great relationship with the thickness of the coating. The protective and decorative properties of zinc coating can be significantly improved after passivation treatment, dyeing or coating with light protectant.

Galvanizing principle:

In the plating tank filled with galvanizing liquid, the cleaned and specially pretreated part to be plated is used as the cathode, and the anode is made of plated metal, and the two poles are respectively connected with the positive and negative poles of the DC power supply. The galvanizing bath is composed of an aqueous solution containing metal-plating compounds, conductive salts, buffers, pH adjusters and additives. After electrification, the metal ions in the galvanizing solution move to the cathode under the action of the potential difference to form a coating. The metal of the anode forms metal ions into the galvanizing bath to maintain the concentration of the metal ions being plated [1]. In some cases, such as chrome plating, it is an insoluble anode made of lead and lead-antimony alloy, which only plays the role of transferring electrons and conducting current. The concentration of chromium ions in the electrolyte is maintained by regularly adding chromium compounds to the plating solution. When galvanizing, the quality of the anode material, the composition of the galvanizing solution, temperature, current density, energization time, stirring intensity, precipitated impurities, power waveform, etc. will affect the quality of the coating, which needs to be controlled in time.

Under the condition that the height of section steel is the same as that of the abdomen, the section coefficient and stiffness of L section steel are larger than that of bulb flat steel; under the same section coefficient, the warehouse capacity of the ship is increased and economic benefits are improved; in addition, under the same section coefficient, L The thickness of the section steel panel is slightly thinner than that of the bulb flat steel, which is beneficial to improve the quality of the weld.

Its specifications are expressed as: web height (h × area width (b) × web thickness (t) × panel thickness (T) mm.

Main use: L-shaped steel can be used not only for large ships, but also for marine engineering structures and construction engineering structures with high requirements

Profile steel is a bar-shaped steel with a certain cross-sectional shape and size, and is one of the four major varieties of steel (plate, tube, profile, wire). According to the section shape, the section steel is divided into simple section section steel and complex section section steel (special section steel). The former refers to square steel, round steel, flat steel, angle steel, hexagonal steel, etc.; the latter refers to I-beam, channel steel, rail, window frame steel, curved steel, etc.

section steel is mainly used in machinery and small hardware section steel; L-section steel can be used not only for large ships, but also for marine engineering structures and construction engineering structures with high requirements; H-section steel is an economical section steel, widely used in industrial , construction, bridges, oil rigs, etc.

 The invention relates to an L-shaped steel-concrete composite structural member, belonging to the technical field of steel-concrete structures; the structural member comprises an L-shaped steel member and concrete, and the steel member is formed by connecting steel plates or profiled steel to form a plurality of Some cavities are filled with concrete, and some cavities are not filled with concrete. The invention will improve the mechanical performance and industrialization level of the structure.

  Steel-concrete composite structural members have the advantages of concrete structures and steel structures, and are more and more widely used in building structures. Shear walls have high bearing capacity and high lateral stiffness, and are the main lateral force-resistant structural components of high-rise structures.

[0003] The cross-section of composite members such as concrete-filled steel tubular columns is generally square or circular, which fully exerts the restraint effect of steel pipes. The steel-concrete composite shear wall has the performance advantages of the shear wall, as well as the production and installation advantages of the steel structure. Generally, the components are formed into steel tube bundles by arranging separators; since the separators are difficult to connect between layers, their mechanical performance cannot be fully exerted. The application number is L profile steel for sale.X patent discloses an L-shaped steel tube bundle composite structure, which is composed of factory-made steel tube bundles and concrete poured into the steel tube bundles on site. The concrete is poured on site, the pouring volume is large, and the prefabrication rate is reduced.