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0Tensile test is to form seamless qb into a sample， and then measure one or more mechanical properties. Usually， only tensile strength， yield strength， elongation after fracture and reduction of area are measured.
aAmong them， qb square tube is divided into: (a) by process & mdash& mdash; Arc welded square tube，Q355b square tube resistance welded square tube (high frequency and low frequency)，Galvanized square pipe stainless steel square pipeWhat is the content of detection gas welded square tube and furnace welded square tube (b) shall be welded according to the requirements
Hot rolled qb square tube continuous casting slab or blooming slab is used as raw material， heated by stepping heating furnace and descaled by high-pressure water into roughing mill. Roughing material enters finishing mill after head cutting， tail cutting and then computer rolling. After final rolling， it is rolled into straight hair coil through laminar cooling and coiler. The head and tail of straight hair curl are often tongue shaped and fish tail shaped， with poor accuracy of thickness and width， and there are often defects such as wave shape， hem tower shape and so on. The coil weight is heavy and the inner diameter of the steel coil is mm.
PIskendronMaterial classification: square pipe is divided into ordinary carbon steel square pipe and low alloy square pipe.
XhIn the heat exchange planning of metallurgy， petrochemical and other occupations， there are various forms of heat exchangers，Q355b square tube but the conventional heat exchangers have many disadvantages， such as poor heat exchange， difficult cleaning， large dust thermal resistance and so on， which can not meet the needs of production customers. The square tube heat exchanger based on square tube throat has the advantages of excellent heat exchange， easy cleaning， Japanese standard square tube 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.
Production standard classification square tube is divided according to production standard: national standard square tube， British standard square tube， American standard square tube， European standard square tube and non-standard square tube.
vChange to square pipe: generally，Q355b square tube leveled， crimped and welded to form a round pipe，Galvanized square pipe stainless steel square pipeWhat is the content of detection then rolled into a square pipe from the round pipe， and then cut into the required length. Stage ( & mdash; )
ZThe standard number of spiral square pipe (standard of the Ministry of petroleum) for low pressure transmission is syt-. The representative materials are qbqb and other carbon steel materials. It is mainly used for low-pressure transmission of water， oil natural gas， heating and other pipelines.
BinstallThe tensile test is to make qb into a sample， pull the sample to fracture on the tensile testing machine， and then measure one or more mechanical properties. Usually， only tensile strength， yield strength，Galvanized pipe_ Galvanized square pipe_ Seamless steel pipe_ Square tube - Wuxi Jiahang elongation after fracture and reduction of area are measured. Tensile test is the basic mechanical property test of metal materials. Almost all metal materials have specified tensile test as long as they have requirements for mechanical properties. Especially for those materials whose shape is not convenient for hardness test， tensile test has become the only means to test mechanical properties.
gKVarious treatments are summarized as follows: high temperature oxidation method is to immerse the workpiece in a specific molten salt and maintain a fixed process temperature and time
Now in many construction projects， because qb square tube is quite hard in hardness， and the performance and quality of deformation， stamping， cutting and other processing are based on hardness， which is also the guarantee of mechanical properties. Based on the above， it is very important to test the hardness of qb square tube.
Square tube is the main type of square tube. It is also very popular in the square tube market. There are many people doing this kind of thing， so there are many in the competition. The future market potential is huge. We should grasp this information well. In addition， we must learn about relevant maintenance and repair!
OK or not?eSquare tube has good machinability， good cold deformation plasticity and weldability; In addition， the toughness of steel does not decrease much during heat treatment， but it has quite high strength and wear resistance especially when water quenching; However， this steel has great resistance to white spots， temper brittleness and overheating during heat treatment.
ZSection shape classification of large-diameter qb square tube square tube is classified according to section shape: simple section square tube & mdash& mdash; Square tube， rectangular tube and complex section square tube & mdash& mdash; Flower shaped square pipe， open square pipe， corrugated square pipe， special-shaped square pipe， large-diameter qb square pipe surface treatment classification square pipe is divided according to surface treatment: hot-dip galvanized square pipe， electro galvanized square pipe， oil coated square pipe， acid pickling square pipe， large-diameter qb square pipe purpose classification square pipe is classified according to purpose & mdash& mdash; Square tubes for decoration， machine tool equipment， machinery industry， chemical industry， steel structure， shipbuilding， automobile， steel beam and column， special purpose， large-diameter qb square tube wall thickness classification， large-diameter qb square tube according to wall thickness Classification & mdash& mdash; Super large diameter qb square pipe， large diameter qb square pipe and thin-wall large diameter qb square pipe rectangular pipe are the names of square pipe and QB square pipe， that is， steel pipe with equal side length. It is made of rolled strip steel after process treatment. Generally， the strip steel is unpacked， 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. Usually pieces per bag. Qb square pipe， also known as square and rectangular cold-formed hollow section steel， is referred to as square pipe and rectangular pipe， code f and j respectively. The allowable deviation of wall thickness of qb square pipe shall not exceed plus or minus % of nominal wall thickness when the wall thickness is not greater than mm， plus or minus % of wall thickness when the wall thickness is greater than mm except for the wall thickness of corner and welding joint area.
In short， the square tube production process includes these processes: tube blank & mdash& mdash; Cut off & mdash& mdash; Heating & mdash& mdash; Perforation & mdash& mdash; Pipe rolling & mdash& mdash; Sizing (reducing) & mdash& mdash; Straightening & mdash& mdash; Cut head and tail & mdash& mdash; Inspection & mdash& mdash; Packaging & mdash& mdash; Warehousing.
xUnder our actual investigation， Fangguan has a brand-new development
oNAt present， strong corrosion resistance and heat resistance， and are widely used in many scientific and technological fields. Therefore， even so， the use efficiency of square tubes is different. According to the quality of square tubes， we will conduct progressive research on them， hoping to develop better square tubes. No matter what environment， we will make square tubes suitable for use. Then， what is the role of shot blasting and sand blasting in each others pipe? Next， lets introduce it to you.