ASME SA709 Grade 50W 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 50W Chemical Composition

Grade	Chemical composition %
A709 GR 50W	C	Si	Mn	P	S	V	Cu	Ni	Cr
	≤0.20	0.15-0.50	0.75-1.35	≤0.04	≤0.05	0.02-0.10	0.25-0.40	≤0.40	0.40-0.65

 ASME SA709 Grade 50W Mechanical Property

Grade	Mechanical Property
SA709 Grade 50W	Tensile Strength(MPa)	Yield Strength(MPa)	Elongation in 2 in. %
	≧485	≧345	≧21

There are eight grades under standard ASTM SA709 are available in four yield strength levels, and grade A709 Gr. 50W is at 345MPa level. SA709 Grades 50W [345W] have enhanced atmospheric corrosion resistance (see 13.1.2). SA709 Grade 50W product availability is shown in Table 1.

For SA709 Grade 50W wide flange shapes with flange thickness over 3 in. [75 mm], elongation in 2 in. or 50 mm of 18 % minimum applies. Elongation and reduction of area not required to be determined for floor plates SA709 Grade 50W. If the SA709 Gr. 50W plates are wider than 24 in. [600 mm], the reduction of area requirement, where applicable, is reduced by five percentage points. If the SA709 Grade 50W plates are wider than 24 in. [600 mm], the elongation requirement is reduced by two percentage points.