Among them, qb square tube is divided into: (a) by process & mdash& mdash; Arc welded square pipe, resistance welded square pipe (high frequency and low frequency), spiral weldingBrinell hardness (HB), Rockwell hardness (HRC) and Vickers hardness (HV) are commonly used.Morasan,Morasan125 galvanized square pipe,High hardness square tubes mainly bear fatigue load, so they must have high hardness. Therefore, surface quenching or chemical heat treatment shall be carried out, followed by low-temperature tempering treatment.Engaged in square tube, square rectangular tube, seamless square tube, galvanized square tube, galvanized tube, old brand, price advantage and quality guarantee! However, the Demander shall cut off the interface pipe when using it. The weight of short length and non fixed length products shall not exceed % of the total delivery. For qb square pipe with theoretical weight greater than kgm, it shall not exceed % of the total delivery. The bending degree of qb square pipe shall not be greater than mm per meter, and the total bending degree shall not be greater than .% of the total length. Galvanized qb square pipe for low-pressure fluid transmission,MorasanSquare tube galvanizing plant, with standard number of gbt-. Representative materials: QA, qbqb, etc. It is mainly used for conveying water, gas, air, oil and heating hot water or steam, and its purpose is limited to general low pressure fluid.Ban RatsadaHigh density may not be obtained by simple pressurization, and insulation shall be carried out at the same time.Purpose of square tube the purpose of square tube includes construction, machinery, steel construction and other projects, shipbuilding, solar power generation support, steel structure engineering, electric products ( pieces)B. spring steel C. bearing steel tool steel: A. carbon tool steel; b. Alloy tool steel; c. High speed tool steel.

Principle of cold drawing strengthening: the lattice defects of steel increase during plastic deformation, and the serious distortion of defect lattice will hinder the progress and slip of lattice, so the yield point of steel increases and the plasticity and toughness decrease. Due to the internal stress in plastic deformation, the modulus of steel decreases. The cold drawn reinforcement is stored at room temperature for ~ d or heated to ~ ℃ and maintained for a fixed time. This process is called aging treatment.The new improvement ensures that square tubes can be used for a long time. With the development of the times, square tubes are used in more and more fields. So how can we correctly choose square tubes? Next, I'll introduce the process of lower tubes.The inspection items, sampling quantity sampling position and test of square tube shall be in accordance with the provisions of corresponding product standards. With the consent of the demander, hot-rolled square tubes can be sampled in batches according to the rolled root array.Product range, because Baosteel's materials are subject to grade flaw detection and the density of steel is relatively good. After cold drawing and heating, it is convenient to line up. The steel is cold drawn at room temperature to produce plastic deformation, so as to improve the yield strength. This process is called cold drawing strengthening. Square tube is generally used for product parts with high requirements. It has good willfulness and strength. The surface is better after cold drawing. Cold drawing principle.Square tubes are classified by forming: forged steel; Cast steel; Hot rolled steel; Cold drawn steel.

Steel used & mdash& mdash; Such as bridge steel, ship steel, boiler steel, pressure vessel steel, agricultural machinery steel, etc.Bidding,Purpose of square tube the purpose of square tube includes construction, machinery, steel construction and other projects, shipbuilding, electric products ( pieces)The inner and outer walls of the pipe shall retain the original surface without any processing.Brinell hardness (HB) steel structure engineering,MorasanGalvanized square pipe 4, Rockwell hardness (HRC) and Vickers hardness (HV) are commonly used.Morasan,Square tube is a very good steel in economic construction. There are many kinds and principles of cold drawing. You may still have a lot of insufficient understanding of the cold drawing principle of each other's pipe. Next, I'll lead you to learn its cold drawing principle.Solution treatment and nondestructive testing sand rolling treatment and sand blasting treatment many manufacturers in the market do not do solution treatment and % penetration nondestructive testing, and many of them use sand blasting instead of sand rolling. After these steps are omitted, the cost is greatly reduced.Because the green billet can be pressed into any shape, it is easy to weld the square tube into difficult products.