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METAL GRADES

A709-50 Grade Non-Fracture-Critical Steel

ASTM A709 is the standard specification for plates, bars, and shapes used for structural steel bridges and applies to Carbon HSLA (High Strength Low Alloy), Q&T (Quench & Tempered), and stainless-steel metals. ASTM A709 grades 36,50,70, and 100 include designations for enhanced atmospheric corrosion resistance (W). As a non-fracture critical steel, ASTM A709 is designed to meet impact requirements in both fracture critical tension components and non-critical fracture tension components. These standards are based on American Association of State Highway and Transportation Officials (AASHTO) requirements for tension components in bridges. Metals USA carries a robust inventory of ASTM A709 grade 50 material which is commonly used in high-rise buildings, bridges, oil rigs, wind farms, and anywhere greater strength, structural efficiency, and optimum corrosion resistance are required. 

Yield/Tensile Strength

Metric

Imperial

Tensile Strength

485 MPa

65 ksi

Yield Strength

345 MPa

50 ksi

Elongation 200mm/8"

18

18

Elongation 50mm/2"

21

21

Material Chemistry

C

MN

P

S

SI

NI

CR

CU

V

0.19% Max

0.80 - 1.25%

0.030% Max

0.030% Max

0.30 - 0.65%

0.40% Max

0.40 - 0.65%

0.25 - 0.40%

0.02 - 0.10%