Change to square pipe: generally， leveled， crimped and welded to form a round pipe， then rolled into a square pipe from the round pipe， and then cut into the required length. Stage ( & mdash; )
Square tube has a wide range of application fields. Its main field is the construction industry， which promotes the development of economic construction. Because the production process of square tube hole is different， the production design of square tube hole is also different. Next， I will introduce in detail the types of tube hole design below.
serumThe advantage of empty bending is that it can bend the side length when the real bending cannot be carried out， such as synchronous bending and finishing of the upper side and side of qb square tube. Empty bending can also bend the inner corner of r.t without fracture of pipe wall. The disadvantage of empty bending is that when the upper side and side are synchronous empty bending， due to the pressure generated by the upper roll and the lower roll at the same time， the forming force is easy to exceed the critical point， resulting in edge instability and concave， and will also affect the stable operation of the unit and forming quality. This is also the different characteristics of qb square tube and round tube empty bending.
In the square tube production process of welding before forming， the forming is mainly completed by the sizing frame. The sizing machine is generally a two high mill， including horizontal frame and vertical roll frame. At present， there are mainly two kinds of square pipe pass design: one is the horizontal frame is designed according to the box hole， the frame is an elliptical hole， and the other frames are approximately rectangular holes. The pass section is composed of circular arc. Professional projects include: square pipe， square pipe， seamless square pipe， galvanized square pipe， galvanized pipe and other related businesses. Please welcome merchants who want to have this business. And the arc radius increases frame by frame， The fillet radius of the joint between the side wall and the bottom of all pass patterns is equal to the fillet radius of the finished section. The total elongation coefficient of the square tube is about ， which is mainly distributed on the flat roller. The deformation of the vertical roller is very small and its function is to press down the short side of the square tube. With this design， the calculation is complex and the calculation value is not accurate enough. It is necessary to constantly correct the pass circumference.
LinzSquare tube nonferrous metals， also known as non-ferrous metals， such as copper， tin， lead， zinc， aluminum， brass， bronze， aluminum alloy and bearing alloy. In addition， chromium， nickel， manganese， molybdenum cobalt square tube， vanadium， tungsten， titanium， etc. are also used in industry. These metals are mainly used as alloy additives to improve the performance of metals. Tungsten， square tube titanium， molybdenum， etc. are mostly used to produce cemented carbide for tools. The above non-ferrous metals are called industrial metals. In addition， silver and rare metals gold， including radioactive square tubes.
Brinell hardness (HB)， Rockwell hardness (HRC) and Vickers hardness (HV) are commonly used.
Tool derusting mainly uses tools such as steel wire brush to polish the surface of square pipe， which can remove loose or oxidized scale， rust， welding slag， etc. The derusting of manual tools can reach grade SA and that of power tools can reach grade SA. If the square pipe surface is firmly attached with iron oxide scale， the derusting effect of tools is not ideal and can not reach the anchor depth required by construction.
When storing QB square pipe，serumHot dip galvanized pipe factory， we need to select a suitable place. We need to think about many external factors， such as the corrosivity of steel pipe， etc. Therefore， the place must be clean， dry and ventilated， where harmful gases appear， QB square pipe can not appear， weeds and other sundries should be removed in time， and the outer surface of steel should be kept clean. If there are acid， etc. in the warehouse salt， it is easy to react with the steel pipe and corrode the steel pipe， so try to cut it and don"t let it. In addition， if we can think about those higher metal products， but the ventilation setting is excellent. The difference between QB square tube and seamless steel tube QB square tube is a kind of high-precision steel tube material after cold drawing or hot rolling treatment. QB square tube is mainly used to produce products of pneumatic or hydraulic components， such as air cylinder or oil cylinder， which can be seamless pipe or welded pipe， because there is no oxide layer on the inner and outer walls of QB square tube， no deformation under high pressure， high precision， high finish， cold bending， flaring and flattening without cracks. The chemical composition of QB square tube includes carbon silicon Si， manganese Mn， sulfur s， phosphorus P and chromium CR.
Square tubes have a good performance in practical application. When we choose square tubes in practice， we should choose them according to their characteristics. We have different types of square tubes in different fields. What is the difference between the characteristics of square tubes and ordinary steel tubes? Let"s introduce them today to let us have a deeper understanding of each other"s tubes.
The load of impact toughness acting on the parts at a great speed is called impact load. It is specialized in products and renewable resources. Its business includes: square tube， square tube， seamless square tube， galvanized square tube and galvanized tube. The ability of metal under impact load is called impact toughness.
agentThe local heat release in the welding process of square tube can reduce the heat affected zone， avoid the micro of thermal sensitive materials， and maintain the properties of materials.
The pipeline is only subject to chemical pickling， which can remove oxide scale， rust and old coating. Sometimes it can be used as the reprocessing after sand blasting. Although chemical cleaning can make the surface reach a certain cleanliness and roughness， its anchor lines are shallow and easy to pollute the surrounding environment. The square tube shall be submitted for acceptance in batches， and the batch rules shall comply with the provisions of corresponding product standards.
It is good to purchase Baosteel"s materials for cold drawing of square tubes， 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.
When the vehicle is replaced with seamless square tube blank， the material is too soft to affect the requirements so as to ensure the quality of parts and avoid wrinkles.
marketPull square tube:
Process flow of square tube drawing: because the size of the die hole of the square tube drawing is smaller than the outer diameter of the tube in front of the drawing， in order to make the front end of the square tube pass through the die hole smoothly， it is necessary to sharpen the head of the square tube before drawing. Therefore， the end of the square tube with a fixed length should be heated in the slit heating furnace， It is generally ~ mm， and the heating temperature is between ~ ℃ according to different wall thickness. Then use ~ kg air hammer to sharpen and grind the head of the square pipe. Generally， the square pipe with diameter less than mm can be sharpened by rotary forging hammer or roll forging machine.
For structure: as pile driving pipe and bridge; pipe for wharf， road and building structure， marine pile driving pipe， etc.
serumEngaged 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，serumQ345B seamless rectangular tube， 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， 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.
For transportation: water supply，serumGalvanized square pipe machine， drainage sewage treatment engineering， mud transportation， marine water transportation.
B. low alloy structural steel C. ordinary structural steel and high-quality steel for specific purposes (including high-quality steel)