EFFECT OF ALLOYING ADDITIONS ON K-ISCC OF ULTRAHIGH STRENGTH NISICR STEEL

The effect of alloying additions viz. cobalt, molybdenum, cerium and a combination of cobalt and molybdenum, on the K-ISCC of NiSiCr steel i n 3.5% NaCl aqueous solution was studied. Addition of cobalt to NiSiCr steel resulted in an increase in the K-ISCC whereas molybdenum additi on decreased the K-ISCC. Cerium addition did not affect the K(ISCC)whi le the combination of cobalt and molybdenum resulted in an increase in the the K K-ISCC although not as much as in the case of cobalt additi on. The effect of alloying elements on K-ISCC could be attributed to t heir effect on the critical fracture stress and yield strength.