MIL-S-24645A, MILITARY SPECIFICATION: STEEL PLATE, SHEET, OR COIL, AGE-HARDENING ALLOY, STRUCTURAL, HIGH YIELD STRENGTH (HSLA-80 AND HSLA-100) (10-JAN-1990) [SEE NOTICE 1 FOR REPLACEMENT INFORMATION]

MIL-S-24645A, MILITARY SPECIFICATION: STEEL PLATE, SHEET, OR COIL, AGE-HARDENING ALLOY, STRUCTURAL, HIGH YIELD STRENGTH (HSLA-80 AND HSLA-100) (10-JAN-1990) [SEE NOTICE 1 FOR REPLACEMENT INFORMATION]., This specification covers 80,000 (HSLA-80) and 100,000 (HSLA-100) pounds per square inch (lb/in) high yield strength, age-hardening alloy steel plate, sheet, and coil intended primarily as replacements for steel grades HY-80 and HY-100, respectively, for approved uses in critical structural applications where notch-tough high-strength materials are required.