Galvanized square tubing prices
Galvanized square pipe is a kind of hollow square section steel pipe with square section shape and size made of hot-rolled or cold-rolled galvanized strip steel or galvanized coil steel as blank after cold bending and forming and then high-frequency welding, or a galvanized square pipe made of pre-prepared cold-formed hollow steel pipe and then hot-dip galvanizing.
Galvanized square tubes are divided into hot galvanized square tubes and cold galvanized square tubes in terms of production technology. It is precisely because of the different processing of these two galvanized square tubes that they have many different physical and chemical properties. In general, they have many differences in strength, toughness and mechanical properties.
Hot galvanized square pipe
Hot-dip galvanized square tube: it is a kind of square tube formed by welding after using steel plate or steel strip crimping, and then placing the square tube in the hot-dip galvanized tank after a series of chemical reactions. The production process of hot-dip galvanized square tube is relatively simple, and the production efficiency is very high, and there are many varieties and specifications. This kind of square tube requires little equipment and capital, which is suitable for the production of small galvanized square tube manufacturers. But in terms of strength, the strength of this steel pipe is far lower than that of seamless square pipe.
Cold galvanized square pipe
The cold-galvanized square pipe uses the principle of cold-galvanization on the square pipe used to make the square pipe have anti-corrosion performance. Unlike hot galvanizing, cold galvanizing coating mainly uses electrochemical principle to prevent corrosion. Therefore, it is necessary to ensure the full contact between zinc powder and steel, resulting in electrode potential difference, so steel surface treatment is very important.
Difference between hot and cold galvanizing
Galvanized square tubes can be divided into hot galvanized square tubes and electric galvanized square tubes. The hot-dip galvanized square pipe includes wet method, dry method, lead-zinc method, oxidation-reduction method, etc. The main difference between different hot-dip galvanizing methods is what method is used to activate the pipe surface to improve the galvanizing quality after the steel pipe is pickled and cleaned. At present, dry process and redox process are mainly used in production, and their characteristics are shown in the table. The surface of the zinc coating is very smooth, dense and uniform; Good mechanical properties and corrosion resistance; Zinc consumption is 60%~75% lower than that of hot galvanizing. Electrogalvanizing is technically complicated, but this method must be adopted for single-sided coating, double-sided coating with different thickness of inner and outer surface coating, and thin wall pipe galvanizing.
Because galvanized square tubes are galvanized on square tubes, the application scope of galvanized square tubes has been greatly expanded compared with square tubes. It is mainly used for curtain wall, architecture, machinery manufacturing, steel construction projects, shipbuilding, solar power generation support, steel structure engineering, electric power engineering, power plant, agricultural and chemical machinery, glass curtain wall, automobile chassis, airport, etc.
Zinc plating has stronger protection and corrosion resistance. The whole structure is composed of zinc, forming a dense quaternary crystal, which forms a barrier on the steel plate, thus effectively preventing the penetration of corrosion factors. The corrosion resistance comes from the strong protective function of zinc barrier layer. When zinc is used for sacrificial protection in trimming, scratch and coating scratch parts, zinc will form an insoluble oxide layer to play the barrier protection function.
Steel c channel dimensions
Channel steel is a long strip steel with a grooved section. It is a carbon structural steel for construction and machinery. It is a section steel with a complex section. Its section shape is grooved. Channel steel is mainly used for building structure, curtain wall engineering, mechanical equipment and vehicle manufacturing.
Model and size setting of channel steel
The specification of channel steel is mainly expressed by the dimensions of height (h), leg width (b), waist thickness (d), etc. The specification of domestic channel steel is from 5 to 40, that is, the corresponding height is 5 to 40 cm.
For example, 100 * 48 * 5.3 means channel steel with waist height of 100 mm, leg width of 48 mm and waist thickness of 5.3 mm, or 10 # channel steel.
At the same height, light channel steel has narrower legs, thinner waist and lighter weight than ordinary channel steel. No. 18-40 is large channel steel, and No. 5-16 is medium channel steel.
The length of channel steel is divided into two types: fixed length and double length, and the allowable difference is specified in the corresponding standards. The length selection range of domestic channel steel is divided into 5 - 12m, 5 - 19m and 6 - 19m according to the specification number. The length selection range of imported channel steel is generally 6-15m.
(1) A thick and dense pure zinc layer is covered on the steel surface, which can avoid the contact between the steel substrate and any corrosion solution and protect the steel substrate from corrosion. In general atmosphere, a thin and dense zinc oxide layer is formed on the surface of the zinc layer, which is difficult to dissolve in water, so it plays a certain protective role on the steel substrate.
(2) It has an iron-zinc alloy layer, which is compact and has unique corrosion resistance in marine salt fog atmosphere and industrial atmosphere;
(3) Because of the firm combination and the mutual dissolution of zinc and iron, it has strong wear resistance;
(4) Because zinc has good ductility and its alloy layer is firmly attached to the steel base, the hot-plated parts can be formed by cold stamping, rolling, wire drawing, bending and other processes without damaging the coating;
(5) After hot-dip galvanizing of steel structural parts, it is equivalent to one annealing treatment, which can effectively improve the mechanical properties of the steel substrate, eliminate the stress during the forming and welding of steel parts, and is conducive to the turning of steel structural parts.
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