ASTM A572 Grade 50 is a high-strength, low-alloy (HSLA) structural steel that offers an excellent combination of strength, weldability, and notch toughness. It is commonly used in structural applications such as bridges, buildings, and construction equipment.
Chemical Composition:
Carbon (C): Max 0.23%
Manganese (Mn): 1.35%
Phosphorus (P): Max 0.040%
Sulfur (S): Max 0.050%
Silicon (Si): 0.15-0.40%
Vanadium (V): 0.01-0.15% (as applicable)
Columbium (Cb): 0.005-0.05% (as applicable)
Copper (Cu): Min 0.20% (if specified)
Mechanical Properties:
Tensile Strength: 450 MPa (65 ksi) minimum
Yield Strength: 345 MPa (50 ksi) minimum
Elongation: 18% minimum in 8 inches (200 mm); 21% minimum in 2 inches (50 mm)
Physical Properties:
Density: Approx. 7.85 g/cm³ (490 lb/ft³)
Modulus of Elasticity: 200 GPa (29,000 ksi)
ASTM A572 Grade 50 has several equivalents depending on the standard:
EN Standard:
S355J2-steel_4448.html target=_blank class=infotextkey>S355JR / S355JO / S355J2 (EN 10025-2)
These European grades are widely used in structural steel applications and have similar mechanical properties to A572 Grade 50.
JIS Standard:
SM490A / SM490B / SM490YB (JIS G3106)
These Japanese grades are used for welding structures and have mechanical properties that are roughly comparable to A572 Grade 50.
Chinese Standard:
Q345B / Q345C / Q345D (GB/T 1591)
These grades are the Chinese equivalents and are often used in construction, similar to A572 Grade 50.
ISO Standard:
Fe 510 (ISO 630)
This is a global standard for structural steel and can be considered an equivalent to A572 Grade 50.
Construction: Used in the construction of buildings, bridges, and other structures that require a high strength-to-weight ratio.
Machinery: Utilized in the production of cranes, earthmoving equipment, and other machinery where both strength and ductility are critical.
Transportation: Employed in the fabrication of truck frames, railcars, and other vehicles where strength and durability are important.
ASTM A572 Grade 50 is highly versatile and widely used across various industries for its balance of strength, weldability, and cost-efficiency.
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