〣Description

Square pipe, square pipe and rectangular pipe is a kind of address, that is, the side length is equal and unequal steel pipe. It is made of strip steel through processing and rolling. Generally, strip steel is unpacked, leveled, crimped, welded to form a round tube, which is then rolled into a square tube and cut to the required length. Also known as square and rectangular cold-formed hollow steel, square pipe and rectangular pipe for short, code F and J respectively

1. The allowable deviation of the wall thickness of the square rectangular pipe shall not exceed plus or minus 10% of the nominal wall thickness when the wall thickness is less than 10mm, and plus or minus 8% of the wall thickness when the wall thickness is more than 10mm, except the wall thickness of the corner and weld area.

2. The usual delivery length of square tube is 4000mm-12000mm, mostly 6000mm and 12000mm. Square rectangular pipe is allowed to deliver not less than 2000mm short and non-fixed size products, can also be delivered in the form of interface pipe, but the customer should be in use when the interface pipe should be removed. The weight of short size and non-fixed size products shall not exceed 5% of the total delivery, for the theoretical weight of more than 20kg/m square pipe shall not exceed 10% of the total delivery

3. The bending degree of the square tube shall not be greater than 2mm per meter, and the total bending degree shall not be greater than 0.2% of the total length

〣Use

The square pipe is classified according to its use: decorative square pipe, machine tool equipment square pipe, mechanical industry square pipe, chemical square pipe, steel structure square pipe, shipbuilding square pipe, automobile square pipe, steel beam column square pipe, special purpose square pipe.

Application: Widely used in machinery manufacturing, construction industry, metallurgical industry, agricultural vehicles, agricultural greenhouses, automobile industry, railway, highway guardrail, container skeleton, furniture, decoration and steel structure fields.

Used in engineering construction, glass curtain wall, door and window decoration, steel structure, guardrail, machinery manufacturing, automobile manufacturing, household appliance manufacturing, shipbuilding, container manufacturing, electric power, agricultural construction, agricultural greenhouse, bicycle rack, motorcycle rack, shelves, fitness equipment, leisure and tourism supplies, steel furniture, various specifications of oil casing, oil tubing and pipeline pipe, water, gas, sewage, air, mining Warm and other fluid transmission, fire and support, construction, etc.

〣Implementation standard

GB/T6728-2002,GB/T6725-2002, GBT3094-2000, JG 178-2005, ASTM A500 JIS G3466, EN10210 or Technical Agreement.

GB/T3094-2000 (national standard) cold pressed shaped rectangular tube

GB/T6728-2002 (national standard) cold formed hollow section steel for structure

Welded rectangular tubes and seamless rectangular tubes with cold formed circular and irregular sections in carbon steel for construction

En 10219-1-2006(Euro standard) Cold formed welded hollow structure profiles of non-alloy and fine grains

Angular rectangular tubes for general construction

〣Paramater