Effects of Alloying Elements on Temperability and Mechanical Properties of Low-Alloy Structural Steel (SNCM8)
Study of, low-alloy structural steel-II
1962 Volume 48 Issue 2 Pages 143-148
Details
1962 Volume 48 Issue 2 Pages 143-148
In the previous paper (Tetsu-to-Hagané vol. 48, (1961), 1, pp. 34-38) effect of increasing of Ni, Cr, Mo and V, and decreasing of C content to the hardenability of Ni-Cr-Mo steel (SNCM 8: SAE 4340) was reported.
In this paper, by using the same test materials and the same quench-cooling rate, as those in the, previous paper, the mechanical properties in as-tempered condition were examined in connection with their alloying elements. The test specimens quenched at 4 different cooling rates were tempered at appropriate temperature so as to obtain as-tempered strength of 80 to 130kg /mm2. Then a comprehensive study was made on temper-softening tendency, tensil property and notched impact property at room temperature (20°C) and -40°C. A study on sensitivity of temper-embrittlement was also performed.
