Properties
At room temperature, ES-1's yield (tensile strength before deformation) is 224,500 PSI (1547 MPa), ultimate yield (breaking point) is 263,700 PSI (1818 MPa). At 900°C, yield is 193,900 PSI (1337 MPa), and ultimate yield is 246,700 (1701 MPa). Rockwell hardness is 45.6 (455 HV10). For toughness, the Charpy notch impact is 56.2 foot-pounds (76 J) at room temperature, and 42.7 ft-lbs (58 J) at -40F (-40°C).
ES-1 is a balance of cost, tensile strength, high temperature tensile strength and toughness. By varying the heat treatment to include water or liquid nitrogen quenching, or omitting the normalization heat-treat to permit work hardening, properties can be improved. ES-5, with an economical air and water quench, provides 244,800 PSI of yield, and 291,900 PSI ultimate yield.
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