As a bridge; Pipes for wharf， road， building structure， etc. It is mainly used as petroleum geological drilling pipe， cracking pipe for petrochemical industry， boiler pipe，Square tube high-precision structural pipe for automobile，16 galvanized round pipeIt has been widely used in recent years tractor and aviation， etc.
3Shot blasting is often used to clean the surface of castings or strengthen the surface of square tubes.
n. fake and inferior square tubes are easy to fold. Folding is a variety of broken lines formed on the surface of square tubes， and this defect often runs through the longitudinal direction of the whole product. The reason for the folding is that the fake and shoddy manufacturers pursue the rate， the reduction is too large， resulting in ears， folding occurs during the next rolling， the folded products will crack after bending， and the strength of the square tube will be greatly reduced.
Strength structural steel， with carbon content of .% - .%，Square tube adding main alloy elements such as manganese， silicon， vanadium， niobium and titanium; Its total alloy content is %. According to the strength， it is divided into four levels: ， ， and MPa.
MQuesadaThe standard quantity of combustible and nonflammable square tubes is gbt- (gbt-). The representative material is l-l pipeline steel. It specializes in selling square tubes， rectangular tubes， seamless square tubes， galvanized square tubes and galvanized tubes，Square tube with large quantity， high quality and low price. It is fire-resistant，16 galvanized round pipeIt has been widely used in recent years waterproof， high temperature resistant， durable safe and reliable. It is mainly used to transport combustible and nonflammable fluids， the technical regulations shall be strictly implemented in the operation of the circular furnace， the operation of the heating furnace shall be frequently， the abnormal conditions shall be handled in time and recorded， and the follow-up posts and quality management department shall be notified in time for handling.
Mechanical properties of seamless qb square tube: tensile strength & sigma; b (MPa)：≥ yield strength & sigma; s (MPa)：≥ elongation & Delta; (%)：≥ reduction of area & psi; (%)：≥ impact absorption energy (impact value) (akuj): & Ge; the products produced by the more complex technology are exquisite. At present， Fangguan is highly praised by the public in the market. What is important is that there is a good guarantee in terms of quality. Therefore，Square pipe, square rectangular pipe, seamless square pipe, galvanized square pipe, galvanized pipe - Wuxi Jiahang metal products Co., Ltd whether Fangguan can obtain such a high market evaluation depends on the complex technology of Fangguan.
The qb square tube rolled from the strip steel through process treatment is generally to unpack， flatten， curl and weld the strip steel to form a round tube， then roll the round tube into a square tube， and then cut it to the required length. Nowadays， the forming of qb square tube has solid bending and empty bending. The bending degree of qb square tube shall not be greater than mm per meter， and the total bending degree shall not be greater than the actual bending of the total length. As the name suggests， the bending is compacted， and the internal and external rollers and the internal and external walls of the tube blank are compacted in both directions during the actual bending.
lSquare tube for automobile half shaft sleeve (gb-) is a high-quality carbon structural steel and alloy structural steel hot-rolled square tube for automobile half shaft sleeve and drive axle housing.
WD. do not cut your hands boring， especially for girls. Holding or fingers will bind themselves.
XPromise and keep promiseMechanical properties of seamless qb square tube: tensile strength & sigma; b (MPa)：≥ yield strength & sigma; s (MPa)：≥ elongation & Delta; (%)：≥ reduction of area & psi; (%)：≥ impact absorption energy (impact value) (akuj): & Ge; the products produced by the more complex technology are exquisite. At present， Fangguan is highly praised by the public in the market. What is important is that there is a good guarantee in terms of quality. Therefore， whether Fangguan can obtain such a high market evaluation depends on the complex technology of Fangguan.
gRThe square tube will be tested in many aspects of its performance in the process. Each test is for the square tube to have a good performance in practical application. So what are the different properties of square tubes? Next， Ill introduce the characteristics of the lower tubes in terms of mechanical properties.
Strength structural steel， with carbon content of .% - .% adding main alloy elements such as manganese， vanadium， niobium and titanium; Its total alloy content is %. According to the strength， it is divided into four levels: ， ， and MPa.
Square tube is a kind of square tube type. Many materials can form square tube body. It is used for what purpose and where. Most square tubes are steel tubes， mostly structural square tubes， decorative square tubes and building square tubes. Square tubes can be divided into seamless and welded joints. Seamless square tubes are formed from seamless circular tubes.
Welcome to inquirefThere are some defects in qb square tube during stretching， which are caused by the following reasons. The common main reasons are as follows: select the appropriate qb square tube material， and the commonly used materials in austenitic qb square tube are CrNiTi and CrNiTi. During deep drawing， CrNiTi is more stable than CrNiTi and has better crack resistance. Therefore， CrNiTi material should be selected as much as possible.
PWith the rapid development， more and more large-diameter seamless square tubes are used. Large diameter seamless square tubes play a good role in economic development. Because there are many types of large-diameter seamless square tubes， the continuous casting process of large-diameter seamless square tubes is also different. What are the specific steps of the continuous casting process of large-diameter seamless square tube? As the name suggests square tube is a kind of square tube type. Many materials can form square tube body. Its medium is used for what purpose and where it is used. Most square tubes are steel tubes， which are unpacked， leveled， crimped and welded to form round tubes， square tubes per package are mostly in large specifications in terms of spot and then cut into the required length. Generally， and . - ~~ - square tubes are divided into structural square tubes， decorative square tubes， building square tubes， mechanical square tubes， etc. according to their uses.
Compared with other traditional pipes， square pipe supply steel pipe has lighter raw materials， high strength， good resistance， can withstand high internal pressure， sensitive application， and can get used to messy or bad geological conditions.
gTo 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.
fTElectrochemical polishing: long specular gloss， stable process， less pollution and good durability. Suitable for mass production， rectangular square tube.imported products and public service products. Its processing technology is stable and the operation is simple.
Section shape classification square tube is classified according to section shape: simple section square tube: square tube