AISI 12L14 is a Standard Resulfurized and Rephosphorized grade Carbon Steel. ... Applications include high-speed screw machine products, spindles, bushings, hose fittings and many other items where the superior machining characteristics of this steel can be fully utilized. Rockwell Hardness: B84 Tensile Strength, psi: 78,300 Yield Strength, psi: 60,200 Elongation: 10%