MIL-S-22664B
MIL-S-22664B, MILITARY SPECIFICATION: STEEL, STRUCTURAL SHAPES ALLOY, HIGH YIELD STRENGTH (HY-80 AND HY-100) (15 MAR 1988) ., This specification covers HY-80 and HY-100 alloy steel rolled and extruded shapes for use in applications where good weldability and notch toughness are required.
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