In the square tube production process of welding before forming， 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.
Engaged in square tube square rectangular tube， seamless square tube， galvanized square tube， galvanized tube， 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， with standard number of gbt-. Representative materials: QA， qbqb，RosellePrice of DN80 galvanized square pipe， etc. It is mainly used for conveying water， gas， and its purpose is limited to general low pressure fluid.
RoselleFor the level of resistance welding cold formed square pipe oil and heating hot water or steam， the size of R angle is generally between - times of the wall thickness. It can also produce R angle square pipe of the size required by customers according to customers" needs; Square pipe is a kind of long steel with hollow section and no joints around. It is a square pipe formed by four sides of seamless pipe mold. Square pipe has hollow section， professional square pipe， square rectangular pipe， seamless square pipe， galvanized square pipe， galvanized square pipe，RoselleDN150 galvanized steel pipe， strict inspection and quality assurance. The preferential activity is in progress. Welcome to consult. A large number of pipes are used for conveying fluid. They are mainly used in conveying， hydraulic support and mechanical structure， Medium and low pressure， high pressure boiler tubes， heat exchange tubes， gas， oil and other industries. It is stronger than welded and will not crack.
Brinell hardness (HB)， Rockwell hardness (HRC) and Vickers hardness (HV) are commonly used.
Camara drovosSolution 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.
There are sets of MPM and sets of MRK pipe mills in the world. Strength refers to the function of qb square tube data being destroyed under static load (appropriate plastic deformation or fracture). Because the action forms of load include tension， contraction， meandering， shear and so on， because the strength is also divided into tensile strength compressive strength， flexural strength， shear strength and so on. There is often a definite connection between various strengths. Long term square tube， square rectangular tube， seamless square tube， galvanized square tube and galvanized tube have no turnover to avoid price difference， and the price is % higher than the market price! The price of more than one ton is higher! In normal use， tensile strength is often taken as the fundamental strength gauge needle.
During the pushing process of spot welding and repair welding elbows， there will be thinning， so manufacturers usually use thick spot pipes. If thin raw materials are used， the products produced must be unqualified. Generally， there are about wires thinned. If the technology is not good or the drawn pipe is used， the thickness is significantly lower than the standard.
If the re inspection results are unqualified (including the items whose preliminary inspection results are unqualified and re inspection is not allowed)， the supplier can submit them for acceptance one by one; Or re conduct heat treatment (the number of RE heat treatment shall not exceed times)， and propose acceptance with a new batch.
Functional index analysis of square tube - angular plasticity refers to the power of plastic deformation (permanent deformation) without destruction of square tube data under load.
For transportation: water supply， drainage， sewage treatment engineering， mud transportation， marine water transportation.
Economic managementDuring the pushing process of spot welding and repair welding elbows， there will be thinning， so manufacturers usually use thick spot pipes. If thin raw materials are used， the products produced must be unqualified. Generally， there are about wires thinned. If the technology is not good or the drawn pipe is used， the thickness is significantly lower than the standard.
For gas transmission: gas， steam and liquefied petroleum gas.
For structure: as pile driving pipe and bridge; pipe for wharf， marine pile driving pipe， etc.
Due to the increase of square tube production， there are more and more fake and shoddy square tubes in the market. How to distinguish the fake and shoddy square tubes? Let me teach you some points to distinguish the fake and shoddy square tubes.
offerBecause the green billet can be pressed into any shape， it is easy to weld the square tube into difficult products.
According to production， square tubes are divided into hot-rolled tubes， cold-rolled tubes， cold drawn tubes tubes， pipe jacking， etc. According to the section shape， the square tube is divided into round and special-shaped. The special-shaped tube has many complex shapes， angular oval， angular， melon seed， star and winged tube.
The appearance of fake and inferior square tubes often has pitting. Pockmarked surface is an irregular uneven defect on the surface of square lead pipe due to serious wear of rolling groove. Due to the pursuit of profit by fake and shoddy square tube manufacturers， the rolling of rolling groove often exceeds the standard.
RoselleCold drawn or cold rolled precision square tube (gb-) is a cold drawn or cold rolled precision square tube with high dimensional accuracy and good surface finish for mechanical structure and hydraulic equipment. The selection of precision square mechanical structure or hydraulic equipment can greatly save machining hours， improve material rate and improve product quality.
Oil drilling pipe (yb-) is a square pipe used for internal or external thickening at both ends of oil drilling. Steel pipes are divided into turning wire and non turning wire. Turning wire pipe is connected with joint， and non turning wire pipe is connected with tool joint by butt welding.
The principle of straightening machine is that a disc is divided into two sides to clamp round steel straight lines. Professional square tube， square rectangular tube， seamless square tube， galvanized square tube， galvanized tube， high price， service， on-site settlement， honest operation! The edge is one with radius r， and the center distance between them is adjusted to R + R + D.