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METAL GRADES

A588 Grade Atmospheric Corrosion Resistance Steel

Metals USA is a leading steel distributor in the U.S. and carries ASTM A588 steel products. ASTM A588 Grade A, also known as “weathering steel”, is specifically designed to achieve excellent performance with respect to atmospheric corrosion resistance. Over time, a layer of protective iron oxidizes onto the surface, and it is common to use unpainted. If corrosion is an important factor in your project, ASTM A588 Grade A is four times more resistant to corrosion than untreated carbon steel. ASTM A588 is also available in grades B, C, and K and all grades are Silicon Killed. Silicon Killing is a deoxidation process applied to ensure a more homogeneous structure.

Yield/Tensile Strength Grade A

Metric

Imperial

Tensile Strength, Ultimate

400 - 550 MPa

58,000 - 79,800 psi

Tensile Strength, Yield

250 MPa

36,300 psi

Elongation at Break

(in 200 mm)

20.0%

20.0%

Elongation at Break

(in 50 mm)

23.0%

23.0%

Modulus of Elasticity

200 GPa

29,000 kso

Bulk Modulus

(Typical for Steel)

140 GPa

20,300 ksi

Poissons Ratio

0.260

0.260

Shear Modulus

79.3 GPa

11,500 ksi

Material Chemistry (Grade A)

C

MN

P

S

SI

NI

CR

CO

V

0.19%

0.80 - 1.25%

0.030%

0.030%

0.03 - 0.65%

0.40%

0.40-0.65%

0.25-0.40%

0.02-0.10%

Material Chemistry (Grade B)

C

MN

P

S

SI

NI

CR

CO

V

0.20%

0.75 - 1.35%

0.030%

0.030%

0.15 - 0.50%

0.50%

0.40-0.70%

0.20 - 0.40%

0.01 - 0.10%

Material Chemistry (Grade K)

C

MN

P

S

SI

NI

CR

MO

CO

NB

0.17%

0.50 - 1.20%

0.030%

0.030%

0.25 - 0.50%

0.40%

0.40 - 0.70%

0.10%

0.30 - 0.50%

0.005 - 0.05%