ASTM A709 steel

A high-strength, low-alloy structural steel plate utilized primarily in the manufacture of bridges. Gnee steel stocks A709 Grade 36, A709 Grade 50 and A709 Grade 50W. These grades are often specified with Charpy tests referencing the specific zone or lowest anticipated service temperature. The Charpy tests are specified as non-fracture critical, which is a per-heat test (frequency "H"), or fracture critical, which is a per-plate test (Frequency "P").

The specifications:
Thickness: 3mm--150mm
Width: 30mm--4000mm
Length: 1000mm--12000mm
Standard: ASTM EN10025 JIS GB

ASTM A709 (Grade 36, 50 and 50W) Chemical Composition

A709 Steel Composition
	Grade 36	Grade 50	Grade 50W
Carbon	0.26%	0.23%	0.2% max
Manganese	…	1.35%	0.75-1.35%
Phosphorus	0.04%	0.03% max	0.03% max
Sulfur	0.05%	0.03% max	0.03% max
Silicon	0.4% max	0.15-0.4%	0.15-0.5%
Nickel	…	…	0.5% max
Chromium	…	…	0.4-0.7%
Copper	0.2%	…	0.2-0.4%
Vanadium	…	…	0.01-0.1%

Mechanical Properties 709 Gr 36:
Tensile: 58 to 80 ksi
Yield:36 ksi min
Elongation:18% min in 8" 21% min in 2"

Mechanical Properties 709 Gr 50:
Tensile: 65 min ksi
Yield: 50 ksi min
Elongation: 16% min in 8" 19% min in 2"

Mechanical Properties 709 Gr 50W:
Tensile: 65 min ksi
Yield:50 ksi min
Elongation:16% min in 8" 19% min in 2"