ASTM A516 Grade 65 Plate is a carbon steel plate designed for moderate and lower-temperature service in various industrial applications. It is part of the ASTM A516/A516M standard, which covers carbon steel plates intended primarily for service in welded pressure vessels where improved notch toughness is essential. This grade is known for its excellent weldability and notch toughness, making it suitable for a range of applications in the oil, gas, petrochemical, and power generation industries. The plate typically comes in thicknesses ranging from 1/4 inch to 4 inches (6.4mm to 101.6mm) and can be supplied in various widths and lengths, catering to different project requirements. ASTM A516 Grade 65 Plate exhibits a specified minimum tensile strength of 450 to 585 MPa (65 to 85 ksi) and a minimum yield strength of 240 MPa (35 ksi) at a 0.2% offset. It has an elongation of 19% minimum and a reduction of area of 40% minimum. The hardness of this plate, measured on the Brinell scale, falls within the range of 180 to 230 HB.

In terms of chemical composition, ASTM A516 Grade 65 Plate typically contains carbon in the range of 0.24% to 0.29%, manganese between 0.85% and 1.20%, and small amounts of phosphorus and sulfur (0.025% each). Silicon is present at levels between 0.15% and 0.40%, while nickel, chromium, and molybdenum are limited to 0.40% maximum for each element. Copper content is restricted to 0.3% maximum.