1.What types of galvanized channel steel are there?
According to the different galvanizing processes, it can be divided into hot-dip galvanized channel steel and hot-blown galvanized channel steel; according to the shape, channel steel can be divided into cold-formed equal-sided channel steel, cold-formed unequal-sided channel steel, cold-formed inner-curled channel steel, and cold-formed outer-curled channel steel.
2.What is the production process of galvanized channel steel?
Annealing outside the line: Before hot-rolled or cold-rolled steel enters the hot-dip galvanizing line, it is first recrystallized in a bottom-drawn annealing furnace or a bell-type annealing furnace. In this way, there is no annealing process in the galvanizing line.
Annealing inside the line: The cold-rolling or hot-rolling workshop directly provides the coil as the original plate for hot-dip galvanizing, and the gas-protected recrystallization annealing is carried out in the hot-dip galvanizing line.
3.What are the characteristics of galvanized channel steel?
Strong corrosion resistance: A thick and dense pure zinc layer covers the steel surface, which can prevent the steel substrate from contacting with any corrosive solution. In the general atmosphere, a very thin and dense zinc oxide layer is formed on the surface of the zinc layer, which plays a protective role; at the same time, it has an iron-zinc alloy layer, which shows unique corrosion resistance in marine salt spray atmosphere and industrial atmosphere.
Good mechanical properties: Due to the strong combination, zinc-iron is mutually soluble and has strong wear resistance; hot-dip parts can be cold-punched, rolled, wire-drawn, bent and other forming without damaging the coating; after hot-dip galvanizing of steel structural parts, it is equivalent to an annealing treatment, which can effectively improve the mechanical properties of the steel matrix, eliminate the stress during steel forming and welding, and is conducive to turning of steel structural parts.
Excellent appearance quality: The surface of the parts after hot-dip galvanizing is bright and beautiful, the surface is smooth, and the color is uniform, which can improve the overall aesthetics of the building
4.What are the application areas of galvanized channel steel?
Construction field: commonly used in stairs, handrails, roof trusses and other parts of building structures. It can also be used as the main material of beams, columns, plates and other components to improve the bearing capacity and seismic resistance of buildings. Manufacturing industry: It can be used to manufacture light structures, shelves, warehouse equipment, etc. In the manufacturing of home appliances, the skeletons of products such as refrigerators and washing machines are also used to ensure the service life and safety of home appliances.
Bridge engineering: As the supporting structure of the bridge, it can enhance the stability and durability of the bridge.
Automobile manufacturing industry: It is widely used in chassis, frame and other parts in the automobile manufacturing process. It has high strength and toughness, which can ensure the safety and comfort of the car.
Shipbuilding industry: It has important application value in shipbuilding, such as hull structure, deck and other parts, which can improve the stability and wind and wave resistance of the ship and ensure the safe navigation of the ship.
5.What are the criteria for determining galvanized channel steel?
Adhesion: Corrosion resistance is mainly determined by the thickness of the galvanized layer. Measuring thickness is often the main basis for judging the quality of galvanizing. It is only meaningful to measure the average zinc weight per unit area. The commonly used methods are film thickness meter method and pickling method.
Uniformity: The most susceptible part of hot-dip galvanized steel is the thinnest part of the zinc layer, so it is necessary to measure whether the thinnest part meets the standard. Recently, there is a tendency to abolish the copper sulfate test method in European and American specifications and JIS, and replace uniformity with distribution, mainly visual or tactile, and use a film thickness meter to check the distribution state when necessary.
Solidity: That is, the adhesion between the galvanized layer and the steel. It mainly requires that the galvanized components must not be peeled off during sorting, transportation, storage and use. The general inspection methods include hammering, extrusion bending, and rolling.