There are many forms of heating furnace， but the ring heating furnace is mainly used. The heating furnace has an annular furnace bottom， which can rotate slowly， the blank is loaded along the diameter direction of the furnace bottom from the inlet， and can be heated and homogenized to the specified temperature when it is used at the outlet. The production process of seamless square tube is relatively slow， and the heating operation especially needs patience. Because if the heating operation is not standardized，Products Show cracks，350 galvanized square pipeWhat are the advantages of the industry folding and eccentricity on the inner or outer surface of the tube blank will only produce waste products and defective products.
6According 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， such as square，Products Show oval， angular， angular， melon seed， Japanese standard square tube， British standard square tube， American standard square tube， European standard square tube and non-standard square tube.
When cutting， please fix it with square tubes such as vise， and then cut it after it is fixed.
Elutsk The qb square tube protective layer thickness detector is used to measure the actual thickness of the seamless qb square tube protective layer on site. It is required that the actual thickness of the seamless qb square tube protective layer of the seamless qb square tube shall not be lower than the design value. When the requirements are not met，Products Show the protective layer of seamless qb square tube can be chiseled and measured.
Qnigma; Su): large stress before the yield stress of the sample decreases; Lower yield point (& sigma; SL): the small stress in the yield stage when the initial instantaneous effect is not considered. The calculation formula of yield point is as follows: where: FS -- yield force (constant) in the tensile process of the sample n (Newton) so -- original cross-sectional area of the sample， mm. Elongation after fracture (& sigma;) in the tensile test，350 galvanized square pipeWhat are the advantages of the industry sawing is adopted.
After chemical treatment and surface treatment of the square tube， the appearance and quality of the square tube have been improved to another height， making the current square tube present in the market in a good state.
lHigh pressure oil pipe for diesel engine (gb-) is a cold drawn square pipe for high pressure pipe of diesel engine system.
PFunctional index analysis of square tube - commonly used are square tube Brinell angle (HB)， Rockwell angle (HRC) and Vickers angle (HV). Angle is a gauge needle to weigh the soft and hard level of metal data. The angle method is rarely used to determine the internal angle in the current life. It uses the metal data surface tested under the fixed load of the indenter with a certain number and shape to determine its angle value according to the level of the object.
YService firstEmpty bending is the bending moment formed in one direction between the outer roll and the outer wall of the tube blank to bend the strip. Empty bending will compress the bending line， the compression effect will lengthen the bending line longitudinally， and the metal at the bending will accumulate and thicken， which is the compression thickening effect of empty bending.
lCSquare tubes shall be stored with supports products and tens of millions of products for you to choose. You can professionally sell square tubes， square rectangular tubes，Galvanized pipe_ Galvanized square pipe_ Seamless steel pipe_ Square tube - Wuxi Jiahang seamless square tubes， galvanized square tubes and galvanized tubes. The transaction safety of galvanized tubes is guaranteed， there will be deformation， uneven incision and crack of the incision. What should we pay attention to when cutting the square tube and how to operate it? Today， I will introduce some problems that should be paid attention to when cutting the square tube. If the correct operation will make the square tube cutting work very smooth， please use a rag or cloth to clean the oil on the surface of the square tube Sundries or soil shall be completely clean.
Requirements for samples samples can be taken from metal pipes with qualified appearance. Generally sawing is adopted.
knowledgesTo sum up， improving the quality level of square tube is the key to ensure the service life of die. Therefore， when the economic cost and equipment conditions permit， the quality level of square tube including surface quality and internal quality， should be improved as much as possible by using more mature process measures.
PThe pressurization size and time are the key to the success or failure of welding. If the square tube synthetic material is not pressurized， a large number of pores will be caused due to the pores of the material itself and the gas generated in the reaction. It is not allowed to leave the reactants in the weld， so it must be densified， mostly mm and mm. The square tube is allowed to deliver short and non fixed length products not less than mm， or in the form of interface tube， but the Demander shall cut off the interface tube when using it. The allowable deviation of the wall thickness of square pipe shall not exceed plus or minus % of the nominal wall thickness when the wall thickness is not greater than mm， plus or minus % of the wall thickness when the wall thickness is greater than mm， except for the wall thickness of corners and weld areas. The weight of short gauge and non fixed gauge products shall not exceed % of the total delivery. For square tubes with a theoretical weight greater than kgm， it shall not exceed % of the total delivery. We have many different ways in square tubes. Different ways make square tubes have different characteristics. According to these characteristics， we can correctly select the appropriate application field， In this way， the use efficiency of square tube can be improved. Next， we will mainly explain the characteristics of pipe cooling technology below. What are the main characteristics of square tubes? Square tube parts have accurate dimensions and smooth surfaces: the dimensional accuracy of cold parts developed at present can reach grade ~ . If ideal ones are adopted， their accuracy is second only to that of fine polished surfaces. Therefore， cold parts generally do not need to be reprocessed， and a small amount only need finishing (grinding).
wFunctional index analysis of square tube - commonly used are square tube Brinell angle (HB)， Rockwell angle (HRC) and Vickers angle (HV). Angle is a gauge needle to weigh the soft and hard level of metal data. The angle method is rarely used to determine the internal angle in the current life. It uses the metal data surface tested under the fixed load of the indenter with a certain number and shape to determine its angle value according to the level of the object.
xLPerformance index analysis of square tube - hardness is an indicator to measure the hardness and softness of metal materials. At present， the hardness method is commonly used to measure the hardness in production. It uses the indenter with fixed geometry to measure the hardness value of the metal material surface tested under fixed load according to the degree of hardness.
Square pipe is an important pipe. Its application in various fields has different performance. According to its different performance， we have carried out different transformation on the other pipe to ensure that the square pipe can be better used. We should make the right choice when purchasing. Below I will introduce the correct way of painting the lower pipe.