Product Details

ASTM A500 Steel Square Tube

1. Manufacturing Process:

Round to square: make continuous angle deformation of cold-rolled or hot-rolled steel plate directly, and then by high frequency welding form a round steel tube forming method, though the reshaping

finally form a rectangular steel tube forming method. Also known as round to square method.

2. Technical requirements:

1). Chemical Composition:

Yield Strength Grade	Demotic Raw-material Grade
235	Q235B, Q235C, Q235D, Q235qC, Q235qD
345	Q345A, Q345B,Q345C,Q345D,Q345Qc, Q345Qd, StE355, B480GNQR

Carbon Equivalent

Ceq(%)=C+Mn/6+Si/24 +Ni/40+Cr/5+Mo/4+V/14

Ⅰgrade product Ceq(%)

Yield Strength Grade	235	345	390
Ceq(%)	≤0.36	≤0.43	≤0.45
Note: In order to improve the performance of steel,390 could add the microelement such as V, Nb, Ti, Mo and N etc.

2). Mechanical Property:

Yield Strength Grade	W.T (mm)	Yield Strength (Mpa)	Tensile Strength (Mpa)	Elongation (%)	(20°C) Impact Value J
235	4~12>12~22	≥235	≥375	≥23	≥27
345	4~12>12~22	≥345	≥470	≥21	≥27
390	4~12>12~22	≥390	≥490	≥19	≥27

3). ⅠGrade Product Yield Strength:

Yield Strength Grade	Outside perimeter (mm)	Wall Thickness (mm)	Yield Strength %
			Directly to Square	Round to Square
235	≥800	12~22	≤80	≤90
345
390			≤85	≤90
Note: when the outer perimeter less than 800mm,can be determined by supply and buyer