MATERIALS - SAE 4335 (MODIFIED) STEEL - 260,000 TO 280,000 PSI HEAT TREATMENT - DEVELOPMENT OF PROCESS CONTROL AND MECHANICAL PROPERTIES FOR
GENERAL DYNAMICS/FORT WORTH TEX
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The best heat treatment for optimum combination of all mechanical properties of SAE 4335 at the 260,000 to 280,000 psi strength level is 1 austenitize at 1525 F for one hr, 2 quench in agitated oil to room temperature, 3 temper at 465 F for two hr, and 4 air cool to room temperature. The mechanical properties of SAE 4335 heat treated to the tensile strength level of 260 to 280 ksi by this procedure indicate that 1 SAE 4335 has superior ductility and impact properties to SAE 4340, 2 the baking cycle of 3 hr at 375 F was not sufficient to remove the embrittling effect of cadmium plating upon SAE 4335, 3 shot peening improved the sustained load strength of cadmium plated specimens, 4 weldin efficiency of approximately 77 can be achieved in arc welded SAE 4335, 5 SAE 4335 is not weldable by Menascos Uniweld process using techniques established for 4340, 6 SAE 4335 has superior fatigue properties to 4340 at stress levels below 140,000 psi, 7 chromium and cadmim plating lowered the fatigue strength of 4335, and 8 shot peening improved the fatigue strength of 4335.