Large square rectangular tube (round to square)

As we all know, box column is widely used in large steel structure buildings at home and abroad, and it has been popularized for many years abroad. Nowadays, more and more construction and design units use large rectangular tube instead of box column structure. With the increasing thickness of the former, it will fully cover the use of domestic box column in the near future. At present, large square tube is extruded into square tube by submerged arc welding process with special equipment. Submerged arc welding is one of the mechanical welding methods with high production efficiency. Its full name is automatic submerged arc welding, also known as automatic arc welding under flux layer. The round to square tube made by this process has the following advantages:    1.High production efficiency On the one hand, the conductive length of welding wire is shortened, and the current and current density are increased, so the arc penetration and welding wire deposition efficiency are greatly improved（ On the other hand, due to the heat insulation effect of flux and slag, there is basically no heat radiation loss on the arc, and the spatter is also less. Although the heat loss for melting flux is increased, the total thermal efficiency is still greatly increased.    2.High weld quality The welding parameters can be kept stable by automatic adjustment. The requirements for welder's technical level are not high. The weld composition is stable and the mechanical properties are good.   3.Good working conditions In addition to reducing the labor intensity of manual welding operation, it has no arc radiation, which is the unique advantage of submerged arc welding.   4.Low processing cost Usually, the processing cost of box column is as high as 1000 to 2000 yuan, while the processing cost of large rectangular tube is only a few hundred yuan, which is very cost-effective.   5.Safer to use Compared with the two, the welding quantity of rectangular tube is much less than that of box column, and the welding quantity is greatly reduced. (eg: the new landmark of Guangdong, Hong Kong and Macao, the 128 meter high super Ferris wheel "Shenzhen light" in Shenzhen, the main columns of Google new office building in Singapore, etc. are all large rectangular tube products that our group has remodeled from the factory.)   With an annual output of 5 million tons, Yuantai Derun is the largest ERW square pipe, rectangular pipe, hollow pipe, galvanized pipe and spiral welded pipe manufacturer in China. Annual sales reached $15 billion. Yuantai Derun has 59 black ERW pipe production lines, 10 galvanized pipe production lines and 3 spiral welded pipe production lines. Square pipe 20 * 20 * 1mm to 500 * 500 * 40MM, rectangular steel pipe 20 * 30 * 1.2mm to 400 * 600 * 40MM, spiral pipe Ø 219-1420mm can be made of steel grades from Q (s) 195 to Q (s) 345B / gr.a-gr.d. Yuantai Derun can produce square rectangular tubes according to ASTM A500, JIS g3466, en10219, din2240 and as1163. Yuantai Derun has the largest square rectangular tube inventory in China, which can meet the direct purchasing demand of customers.   Welcome everyone to cantact Yuantai Derun,E-mail:sales@ytdrgg.com, and Real time connection inspection plant or factory visit！

	square and rectangular hollow section               Unit: mm
Non-standard size	standard size	thickness	non-standard size	standard size	thickness
		1.0			1.5
		1.2			1.7
		1.3	40*135	50*150	2.0
19*19	20*20	1.4	50*140	60*140	2.2
		1.5	60*130	80*120	2.5~5.0
153		1.7	75*125	100*100	5.25~6.0
		2.0			6.5~9.75
		1.0	395		11.5~16
		1.2	50*160		2.5
		1.3	60*150	60*160	2.75
	25*25	1.4	60*180	80*140	3.0~4.0
		1.5	65*180	80*160	4.25~4.75
153	20*30	1.7	70*150	100*150	5.25~6.0
		1.8	90*150	120*120	6.5~7.75
		2.0	90*160	110*110	9.5~9.75
		2.2	100*120	120*180	10.5~11.75
		2.5~3.0	100*125	125*125	12.5~15.75
		1.0	100*140	470	16~~30
	20*40	1.2	60*170	75*150	2.5
20*50		1.3	70*16070*200	100*200	2.75
	25*40	1.4	80*150	140*140	3.0~5.75
32*32		1.5	80*180	150*150	7.5~9.75
	30*30	1.7	127*127	130*130	10.5~11.75
35*35		1.8		570	12.5~15
	30*40	2.0	60*200	100*250	2.5
		2.2	60*220	160*160	2.75~3.25
		2.5~3.0	80*200	180*180	3.5~5.0
232		3.5~3.75	80*220	140*180	5.25~7.75
		1.2	100*180	150*170	9.5~11.75
		1.3	120*160	150*180	12.5~15.75
		1.4	120*200	150*200	16~~30
20*60	25*50	1.5	100*350		2.75
20*80	30*50	1.7	125*250		3.0~3.25
25*65	30*60	1.8	130*250	100*300	3.5~9.75
30*70	40*40	2.0	135*135	150*250	11.5~11.75
35*60	40*50	2.2	140*240	200*200	12.5~14.75
38*38	40*60	2.5~4.0	150*220	200*250	15.5~15.75
45*45	50*50	4.25~5.0	225*225	770	16~~30
		5.25~5.75	100*400	150*300	3.5~4.0
153		5.75~6.0	130*300	200*300	4.5~7.75
		1.3	150*350	250*250	9.5~11.75
		1.4	200*280	180*300	12.5~14.75
30*100	40*80	1.5	220*220	1010	15.5~17.75
40*70	40*100	1.7	200*350	200*400	4.75~11.75
40*90	50*70	1.8	250*350	250*300	12.5~14.75
50*60	50*80	2.0		300*300	15.5~17.75
50*75	60*60	2.2		200*500	4.75~11.75
50*90	60*80	2.5~4.0	300*320	250*450	12.5~14.75
55*55	70*70	4.25~5.0	300*350	300*400	15.5~17.75
65*65		5.25~5.75		350*350	18~~30
232		5.75~6.0	200*450	200*600	4.5~5.75
		1.3	250*400	280*280	6.5~11.75
40*120	50*100	1.5	250*500	300*500	12.5~14.75
40*140	60*90	1.7	300*450	350*400	15.5~17.75
50*110	60*100	1.8		400*400	18~~30
50*120	60*120	2.0	300*650	300*600	4.5~7.75
50*125	75*75	2.2		400*500	9.5~9.75
70*100	80*80	2.5~4.0	300*700	400*600	11.5~13.75
85*85	80*100	4.25~5.0		450*450	14.5~15.75
	90*90	5.25~5.75	320*320	500*500	16.5~17.75
312		7.5~9.75			18~~30
				1300*1300	70~80
The length, width and thickness of other specifications can be customized