Abstract
In sequence to the report No. 1, the authors studied the influences of copper content on the properties at the ordinary temperature of Si-Mn spring steel with the same samples, and the results were as follows:
1) No change was occurred on the non-metallic inclusions.
2) The hardenability measured by Jominy method increased with the Cu addition.
3) At normalized states, the tensile strength, yield point and hardness increased, but the elongation and reduction of area decreased a little with the Cu content.
4) Resistance to the tempering increased with Cu, specially at the range of 400-450°C.
5) Endurance limits of the spring leaves tended to decrease slightly.
