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， so that the clamp jaw of the drawing trolley can the head of the square tube， 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，Q355d square tube 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，16Mn seamless square tubeThe technical level has been greatly improved the square pipe with diameter less than mm can be sharpened by rotary forging hammer or roll forging machine.
5Square pipe is an important type of square pipe， which has great similarities with seamless steel pipe， but it is different. Square pipe is of great use in square pipe which is generally used in the field of building materials and pipes. Today we tell you about the painting of square pipe. In fact， not only painting but also galvanizing. Zinc will precede others The base material of the square tube is corroded. If painting is not for you， it will cost you two sums of money. If painting， it is recommended that you brush zinc rich primer， because you brush other paints， it will corrode quickly， and then continue to corrode your galvanized layer，Q355d square tube so as to achieve the finish coat on the zinc rich primer. In fact， you should paint before galvanizing
lCold 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.
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.
KKoshigayaSquare tube with complex section: flower shaped square tube open square tube， corrugated square tube and special-shaped square tube.
XsFunction index analysis of square tube - the strength acts on the parts in a great progress. The load on the parts is called the charge and trap load. The power of square tube destruction under the charge and trap load is called the charge and trap toughness.
Large diameter welded square pipe for low pressure fluid transmission， Standard No.: gbt-. Representative material: qab grade. It is mainly used to transport low-pressure fluids， such as water， sewage， gas，Q355d square tube air and heating steam.
The general delivery length of qb square pipe is mm-mm， or in the form of interface tube，16Mn seamless square tubeThe technical level has been greatly improved but the Demander shall cut off the interface tube when using it. The weight of short length and non fixed length products shall not exceed % of the total delivery. For qb square tube with theoretical weight greater than kgm， it shall not exceed % of the total delivery. 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 .% of the total length. The square tube is classified according to the production process: hot rolled seamless square tube， cold drawn seamless square tube， seamless square tube and square tube.
hAmong them， qb square tube is divided into: (a) by process & mdash& mdash; Arc welded square tube resistance welded square tube (high frequency and low frequency)， gas welded square tube and furnace welded square tube (b) shall be welded according to the requirements
AThe 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，Square pipe, square rectangular pipe, seamless square pipe, galvanized square pipe, galvanized pipe - Wuxi Jiahang metal products Co., Ltd seamless square tubes， galvanized square tubes and galvanized tubes， with large quantity， high quality and low price. It is fire-resistant waterproof， high temperature resistant， durable， safe and reliable. It is mainly used to transport combustible and nonflammable fluids， with high requirements.
PHonesty is the foundationYou can really feel that the square tube is widely used in the development， and qb square tube factory continues to extend in the technical level， rectangular square tube.
Compared with other traditional pipes， square pipe supply steel pipe has lighter raw materials， high strength， can withstand high internal pressure， sensitive application， and can get used to messy or bad geological conditions.
Functional index analysis of square tube - mechanical function of plastic square tube.
new productpAfter the square tube is cut into a single square tube， the head and root of each batch of square tube shall be subject to strict first inspection. The mechanical properties， chemical composition， fusion condition， surface quality of square tube and NDT shall be carried out to ensure that the pipe making process is qualified before it can be officially put into production.
RStage ( & mdash; )
Performance 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.
eThe raw material for rolling square tube is round tube blank. For a long time， square tube， rectangular tube， seamless square tube， galvanized square tube and galvanized tube have complete products， excellent quality and favorable price. The round tube embryo shall be cut and processed by cutting machine， and the blank with a growth of about m shall be brought to the furnace for heating. The billet is sent to the furnace for heating at a temperature of about degrees Celsius. The fuel is hydrogen or acetylene. The temperature in the furnace is the key problem. After the round tube billet is discharged from the furnace， it should be pierced through the pressure piercer. Generally， the more common piercer is the conical roll piercer. This piercer has high production efficiency， good product quality， large perforation expansion and can wear a variety of steel grades.
yZThe quality of the solid square tube after the square tube formwork removal and curing can be tested according to the requirements and the following ways: use a magnifying glass to observe whether there are non external force cracks on the structural surface of the solid seamless qb square tube. When non external force cracks appear on the surface of qb square pipe， the crack width on the structural surface of ordinary qb square pipe shall not be greater than .mm.
Square tube is a kind of square tube， which is rolled by strip steel after process treatment. Many kinds of materials can form a square tube body. It is used for what purpose and where. Most square tubes are steel tubes， decorative square tubes and building square tubes. Generally， the strip steel is unpacked， leveled， crimped and welded to form a circular tube， which is rolled into a square tube and then cut to the required length. Usually pieces per bag.