Square tube, square tube is a kind of call and rectangular tube, is equal and not equal to the length of steel pipe. After the process of strip is rolled. The general is to strip after unpacking, smooth, curly, circular tube is formed by welding, pipe rolling into square tube and then cut into required length.
Also known as cold-formed square and rectangular hollow steel tube and the moment, referred to as F and J,codenamed
The allowable deviation of 1, square tube wall thickness, when not more than plus or minus 10% of the nominal wall thickness of the wall thickness is less than 10mm, when the wall thickness is greater than 10mmplus or minus 8% of the wall thickness, bending angle and wall thickness of the weld area except.
2, the square tube usually delivery length is 4000mm-12000mm, 6000mm and 12000mm. Square tube allows the delivery of not less than 2000mm short scale and non fixed length products, can also interface pipe in the form of delivery, but the buyer shall be used in the interface tube resection. Short length and non fixed lengthproduct weight does not exceed 5% of the total deliveries, the theoretical weight more than 20kg/m square tube should not exceed 10% of the total deliveries
3, the square tube bending per meter is no larger than 2mm, the total curvature of not more than 0.2% of total length
Square tube production process classification
Square tube according to the production process of hot-rolled seamless pipe, seamless: square pipe,seamless pipe, welded tube extrusion. The welded tube is divided into: (a) -- according to the process of arc welding, resistance welding tube tube (high frequency, low frequency), welding square tube, welded tube (b)by sub -- weld welded square tube, spiral welded pipe
Square tube material classification
Tube material: carbon steel, low alloy square tube. Carbon steel is divided into: Q195, Q215, Q235, SS400,20# steel, 45# steel; low alloy steel is divided into Q345, 16Mn, Q390, ST52-3 etc..
The classification of square tube production standards
Square according to production standard: GB standard tube, square tube, square inch, American Standardsquare, oubiao square, non-standard square.
Square tube section shape classification
According to the classification of square cross-section shape: (1) a simple square section -- square square tube, rectangular tube section (2) complex -- the flower shaped, square shaped tube, corrugated tubeopening, special-shaped tube.
Square tube surface treatment classification
Square according to surface treatment: hot dip galvanized pipe, galvanized square pipe, square pipe, square pipe pickling oil.
Square tube use classification
Classification by use of Decorative Square - square tube, square tube, machine equipment, chemicalmachinery industry square tube steel structure with square tube, square tube, square tube, shipbuildingautomotive steel beam column with square tube, square tube, square tube for special purposes.