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Precision square moment tube
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Precision square moment tube
Square pipe and rectangular pipe, that is, steel pipe with equal length and unequal length.The strip is rolled by process.The strip is usually unpacked, flat, curled, welded into a round pipe, then rolled into a square pipe and cut into the required length.
1, the allowable deviation in the wall thickness of the moment, when the wall thickness is not more than 10 mm shall not exceed the nominal wall thickness of plus or minus 10%, when the wall thickness is more than 10 mm for the wall thickness of plus or minus 8%, except corners and weld area wall thickness.
2. The normal delivery length of the rectangular tube is 4000mm-12000mm, with 6000mm and 12000mm being the majority.
3. The bending degree of the rectangular 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
Process classification
According to the production process, the square moment pipe is divided into: hot-rolled seamless square pipe, cold-drawn seamless square pipe, extruded seamless square pipe and welded square pipe.
The welded square pipe is divided into two parts
1. According to the process -- arc welding square pipe, resistance welding square pipe (high frequency, low frequency), gas welding square pipe and furnace welding square pipe
2. According to the welding seam -- straight welded square pipe and spiral welded square pipe.
The material classification
Square pipe by material: general carbon steel square pipe, low alloy square pipe.
1. General carbon steel is divided into: Q195, Q215, Q235, S185, S235JR, SS400, 20#, S20C, C22, 45#, etc.
2. Low alloy steel is divided into Q345, 16Mn, Q390, st52-3, S355JR, E355, etc.
Production standard classification
The square pipe is divided according to the production standard: national standard, Japanese standard, British standard, American standard, European standard, non-standard standard.
Section shape classification
The square pipe is classified by section shape:
1. Square pipe with simple section: square pipe and rectangular square pipe.
2. Square pipe with complex section: flowered square pipe, open square pipe, corrugated square pipe and irregular square pipe.
Surface treatment classification
The square pipe is divided according to the surface treatment: hot-dip galvanized square pipe, electric-galvanized square pipe, coated square pipe, pickling square pipe.
Use classification
Square tube categories: according to the use to decorate with square tube with square tube, machine tool equipment, industrial machinery with square tube, chemical with square tube, square tube for steel structure, shipbuilding with square tube, cars with square tube, square tube special purposes.
Classification of wall thickness
Rectangular tubes are classified by wall thickness: ultra-thick wall rectangular tubes, thick wall rectangular tubes and thin wall rectangular tubes.
Execution 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) rectangular tube with cold pressure
GB/ t6728-2002 (national standard) structure with cold curved hollow section steel
The ASTM A500 (American standard) structure USES carbon steel cold forming circular section and special section welded rectangular tube and seamless rectangular tube
En10219-1-2006 (European standard) non-alloy and fine grain cold-formed welded hollow structural profiles
JIS G 3466 (daily standard) is generally constructed with angular rectangular tube
Areas of application:
widely used in machinery manufacturing, construction, metallurgical industry, agricultural vehicles, agricultural greenhouse, the automotive industry, railway, highway guardrail, container frame, furniture, decoration and steel structure, etc.
