Use our interactive, online calculator to estimate how much your next Leeco Steel project will weight. ... Carbon & High Strength Low Alloy (HSLA) Structural Steel Plate. A36; A572 Grade 42, 50, 55, 60, 65; CSA G40.21 Grade 44W, 50W, 50A; A709 Grade 36, 50, 50W, HPS 50W, HPS 70W; AASHTO M270 Grade 50, 50W; A588; A606;