ASME SA709 Grade 50S steel

ASTM SA709 covers carbon and high-strength low-alloy steel structural shapes, plates, and bars, quenched and tempered alloy steel, and stainless steel for structural plates intended for use in bridges. There are eight grade in the standard ASTM SA709--Grade 36, Grade 50, Grade 50S, Grade 50W, Grade HPS 50W, Grade HPS 70W and Grade HPS 100W etc. Katalor always keeps thousands of steels structures for bridge usage including A709 materials.

ASME SA709 Grade 50S Chemical Composition

Grade	Chemical composition %
A709 GR 50S	C	Si	Mn	P	S	V	Nb	Cu	Ni	Cr	Mo
	≤0.23	≤0.40	0.50-1.60	≤0.035	≤0.045	≤0.15	≤0.05	≤0.60	≤0.45	≤0.35	≤0.15

ASME SA709 Grade 50S Mechanical Property

Grade	Mechanical Property
SA709 Grade 50S	Tensile Strength(MPa)	Yield Strength(MPa)	Elongation in 2 in. %
	≧450	345-450	≧21

SA709 Grade 50S is a kind of carbon and high-strength low-alloy steel structural shapes, plates, and bars, quenched and tempered alloy steel, and stainless steel for structural plates intended for use in bridges. There are eight grades are available in four yield strength levels, and grade A709 Gr. 50S is at 345MPa level.

For tensile strength of A709 Gr.50S plates, there is no applicable for thickness. For the yield to tensile ratio shall be 0.87 or less for A709 Gr. 50S shapes that are tested from the web location, while for all other SA709 Grade 50S shapes, the requirement is 0.85. A maximum yield strength of 70 ksi [480 MPa] is permitted for structural shapes of SA709 Grade 50S that are required to be tested from the web location.