B. low alloy structural steel C. ordinary structural steel and high-quality steel for specific purposes (including high-quality steel)High quality steel (P & le; .%, S & le; .%)St. Johns,Polishing process of square tube square tube is widely used in our life, so in the subsequent application process, the requirements for square tube in many places are also quite strict, especially for surface treatment. Today, we briefly introduce how the polishing process should be carried out.For gas transmission: gas, steam and liquefied petroleum gas.Florencia, such as arc, electric spark, flame, strong current, high-temperature furnace, electron beam, laser, high-temperature radiation microwave, chemical furnace, etc.Welding is a synthetic gradient material, which can be used as solder to weld special-shaped materials in order to overcome the mismatch of chemical,St. JohnsGalvanized pipe plug,St. JohnsPrice of galvanized iron square pipe, mechanical and physical properties between base metals.Welding seamless welding seamless is to make welded elbows. After grinding and pickling, sand blasting, there is no sign of welding on the surface. Even using advanced flaw detection equipment, and its characteristics are also different. Square tube has strict standards. There are many welding processes and advantages of square tube. Let me show you the welding process and advantages of lower tube.Stainless steel qb square pipe for fluid transportation Standard No.: gbt-. The representative materials are Cr crni crni cr crninb, crnimo etc., which are mainly used to transport low-pressure corrosive media.: it refers to the processing of square tube, which places metal in a closed Jane and applies pressure at the end to extrude the metal from the specified die hole to obtain finished products with the same shape and size. It is mostly used to produce non-ferrous metal materials. Square tube ferrous metal, steel and non-ferrous metal. Before introducing the classification of steel, briefly introduce the basic concepts of ferrous metal, square tube steel and non-ferrous metal.Professional is king,The surface of galvanized square pipe treated by sand blasting, shot blasting or pickling process is relatively clean, and the oxide scale and rust are removed, which improves the adhesion of the coating. When the installation site unconditionally adopts sand blasting and shot blasting, manual and mechanical derusting can be adopted, but the derusting quality level must be reached.The strength, plasticity and hardness discussed above in fatigue QB are the indicators of the mechanical properties of metals under static load. In fact, many machine parts work under cyclic load, under which fatigue will occur.Generally, chemical and electrolytic pickling are used for pickling treatment. Only chemical pickling is used for pipelines, which can remove oxide scale, rust and old coatings. Professional square tubes, rectangular tubes, seamless square tubes, environmentally friendly and economical! The products are exported to foreign countries and are deeply trusted. Sometimes they can be used as reprocessing after sand blasting and rust removal. Although chemical cleaning can make the surface reach a certain cleanliness and roughness its anchor lines are shallow and easy to pollute the environment.

In this period, the technology of continuous rolling pipe was not mature.Direct material,Square tube is an essential material for the construction and Realization of industrialization. It is widely used and has a wide variety. According to different section shapes, square tube is generally divided into sections, plates, pipes and metal products. In order to facilitate the production, ordering and supply of square tube and do a good job in operation and management, it is also divided into heavy rail, light rail, large section steel, medium section steel, small section steel and square tube cold bending Section steel, high-quality section steel,St. JohnsQ345B seamless square tube, wire rod, medium and thick steel plate, sheet steel, strip steel, seamless steel pipe, square pipe welded steel pipe, metal products, etc.After RH treatment, the molten steel should be fed with Si Ca line when the molten steel temperature is high. At this time, calcium treatment can reduce sulfur segregation in the later solidification process.Square tube structural steel A. mechanical steel: (a) quenched and tempered structural steel; (b) Surface hardening structural steel: including carburized steel, ammoniated steel and surface quenching steel; (c) Easy to cut structural steel; (d) Steel for cold plastic forming: including steel for cold stamping and steel for cold heading.St. Johns,Among them, resistance welded square pipe (high frequency and low frequency), gas welded square pipe and furnace welded square pipe (b) are divided by weld & mdash& mdash; Straight seam welded square pipe, spiral weldingThe surface of galvanized square pipe treated by sand blasting, shot blasting or pickling process is relatively clean, and the oxide scale and rust are removed, which improves the adhesion of the coating. When the installation site unconditionally adopts sand blasting and shot blasting, manual and mechanical derusting can be adopted, but the derusting quality level must be reached.Carbon steel classified by chemical composition: square tube A. low carbon steel (C & le; .%); b. Medium carbon steel (C & le; . ~ .%); c. High carbon steel (C & le; .%).