The HR board dimensions available range from 6mm to 100mm in thickness and 1219mm to 3000mm in width. Grades include SS400, S235JR, S275JR, S355JR, ASTM A572 GR50, S355J2, SPHT, SAE1006, SAE1008, SPHC, DD11, SAE1017, SAE1015, and API 5L grades X42, X52, and X65. These specifications ensure versatility for various applications in construction and manufacturing. Please let me know if you need further details.