Accession Number : AD0287894

Title :   MATERIALS - SAE 4335 (MODIFIED) STEEL - 260,000 TO 280,000 PSI HEAT TREATMENT - DEVELOPMENT OF PROCESS CONTROL AND MECHANICAL PROPERTIES FOR

Corporate Author : GENERAL DYNAMICS/FORT WORTH TEX

Personal Author(s) : JONES,R.L.

Report Date : 29 JAN 1958

Pagination or Media Count : 1

Abstract : 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 Menasco's 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.

Descriptors :   *STEEL, AIRFRAMES, ARC WELDING, CADMIUM, FATIGUE (MECHANICS), HEAT TREATMENT, MANUFACTURING, MECHANICAL PROPERTIES, PLATING, STRESSES, TESTS

Distribution Statement : APPROVED FOR PUBLIC RELEASE