MIL-B-11595 / MIL-B-11595E is a specification that covers alloys steel, bars and blanks under 2 inches in diameter for use in the manufacture of barrels for small arms weapons
The Alloy Steel that is covered in MIL-B-11595 is known as Alloy Steel ORD 4150. Alloy 4150 is a direct hardening alloy which allows flame and induction hardening. Direct Hardening alloys can be quenched and tempered to obtain a wide range of hardness, ductility, and strength levels while also being able to resist stress. Alloy 4150 develops good hardness and uniform strength while also being easy to machine
ROUND BAR
FLAT BAR
PLATE
