ASTM A709 grade 50 steel properties are specified in ASTM A709/A709M standard, the specification for structural steel for bridges. ASTM A709 grade 50 steel is high-strength low alloy steel, and it can be structural shapes, plates and bars.

ASTM A709 grade 50 steel properties - chemical composition:

Thickness(mm)	C	Si	Mn	P	S	Cu (Min)
T≤10	0.23	0.4	0.50-1.35	0.04	0.05	0.2
10<T≤40			0.80-1.35
40<T		0.15-0.40

ASTM A709 grade 50 steel properties - mechanical property:

Yield Strength (MPa) min.	Tensile Strength (MPa) min.	Elongation in 8 in. min. %	Elongation in 2 in. min. %
345	450	18	21

ASTM A709 grade 50 steel properties make the steel characterized by high strength and good welding performance, good fatigue resistance, high toughness and low brittle transition temperature, good cold forming performance, corrosion performance and certain wear resistance.

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