ASTM A513--Square and Rectangular Steel Pipe
Material	Steel Grade	Chemical Composition				Mechamical Porperties
		Carbon	Manganese	Phosphorus	Sulfur	Yield Strength	Ultimate Strength	elongation
	MT 1010	0.02-0.15	0.30-0.60	0.035	0.035	45(310)	55(379)	12
	MT 1015	0.10-0.20	0.30-0.60	0.035	0.035	50(345)	60(414)	12
	MT 1020	0.15-0.25	0.30-0.60	0.035	0.035	55(375)	65(348)	10
Specification       and           Tolerance	Largest Nominal Outside Dimension（in.B）		Wall Thickness（in.B）			Outside Tolerance（ in.B）
	3⁄16 to 5⁄8		0.020 to 0.083			0.004
	Over 5⁄8 to 11⁄8		0.022 to 0.156			0.005
	Over 11⁄8 to 11⁄2		0.025 to 0.192			0.006
	Over 11⁄2 to 2		0.032 to 0.192			0.008
	Over 2 to 3		0.035 to 0.259			0.01
	Over 3 to 4		0.049 to 0.259			0.02
	Over 4 to 6		0.065 to 0.259			0.02
	Over 6 to 8		0.185 to 0.259			0.025
Length	4000mm to 12000mm or according to any requiremts from customers
Technigue	Hot rolled or cold rolled,ERW
Package	Civilian Prpdurement and Government Procurement
Transport	container,bulk cargo by sea shipment
Payment	T/T,L/C,Wext Union
Application	Construction, Steel structure, Building material,Gas,water and oil use, Machinery parts