The ASTM A572 standard applies to high-strength low-alloy (HSLA) structural steel plates containing niobium and vanadium.ASTM A572 GR 50 is a high-strength low-alloy steel. Grade 50 steel contains more alloying elements than plain steel, but has a higher strength per unit weight, making it difficult to form. Compared to plain carbon steel, ASTM A572 Grade 50 plate requires less material to meet strength requirements due to its high strength.ASTM A572 Grade 50 plate has a minimum yield strength of 50,000 psi, a tensile strength of 65,000, and a 2" elongation of 19%.ASTM A572 Grade 50 plate has a minimum yield strength of 50,000 psi, a tensile strength of 65,000, and a 2" elongation of 19%. Because of the alloying elements in these plates, their resistance to atmospheric corrosion is improved. It is also considered a "workhorse" grade because of its strength-to-weight ratio and corrosion resistance.
ASTM A572 Grade 50 Chemical Composition:
| Grade | C | Mn | P | V | Ni | Co | S | Si |
| A572 Grade 50 | 0.23 | 1.35 | 0.04 | 0.06 | 0.015 | 0.05 | 0.05 | 0.4 |
SA572 Grade 50 Plate Mechanical Properties:
| Tensile strength | Yield strength | Elongation min, % |
| MPa – 450 | MPa -345 min | 18-21% |
