building material mill black steel square tube carbon steel square pipe/hollow section

Square hollow sections or square tubes are cold formed and welded from either hot rolled, cold rolled, pre-galvanized or stainless steel.

In order to form the square steel section the appropriate mother tube, a round steel tube, has to be formed first. From a round tube rolls are used that progressively press the round tube into a square hollow section. This is all done inline.
Square and rectangular steel tubes have the advantage of being stronger in bending while a round hollow sections has more stiffness in twisting.

Details of building material mill black steel square tube carbon steel square pipe/hollow section

Size	Outer Diameter	10*10mm~2000*2000mm Other sizes can be customized
	Wall Thickness	0.5mm~60mm Other sizes can be customized
	Length	Common length 5.8m, 6m, 11.8m, 12m Less Than 12m sizes can be customized
Standard	GB/T3094 – Cold drawn shaped steel tube ASTM – A500 -Cold-Formed Welded and Seamless Carbon Steel Structural Tubing in Rounds and Shapes BS1387, BS3601, BS EN39 JIS G3444, JIS G3452, JIS G 3454 EN10219 EN10217
Material	Q195, Q215, Q235, Q345, 16Mn, 10#, 20#, 30#, 45#; A36, SS400 ASTM A53 Grade A, Grade B; ASTM A252 Grade 1, Grade 2, Grade 3
Ends Protector	Plastic pipe cap, Iron protector
Technique	ERW
Surface Treatment	Black painting, oiled,painted,galvanized
Section Shape	Square
Package	Bundle, In Bulk, Bags, Clients’ Request
Port	Fancyco Port,Tianjin, China
Date of Delivery	According To The Quantity And Specification Of Each Order
Payment	L/C, T/T, Western Union, Alibaba Trade Assurance

Some size of building material mill black steel square tube carbon steel square pipe/hollow section

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Production process of building material mill black steel square tube carbon steel square pipe/hollow section:

4.Package of building material mill black steel square tube carbon steel square pipe/hollow section: Packing by plastic bags,bundled by steel strip,or as your demand

5.Delivery Time: 

1).The products in stock will delivery immediately received the deposit

2).According to the order quantity, the delivery time range from five days to twenty  days.

6.Trade Terms:EX-Work,FOB,CFR,CIF,

7.Payment Term:T/T or L/C

8.shipment:By container or bulk vessel