Abstract
The authors described the experiments on the effects of increasing the tin content in a cast plain carbon steel containing 0.30% carbon.
A complete investigation was not attempted, but the influence of the element on some of the useful properties of the steel was examined. The steels used were 29 steels containing up to 1.0% tin. They were taken from liquid steel made with a 20 ton basic open hearth furnace.
It was found that tin has practically no effect on the A1 point, but progressively raise the A3 temperature of steel. In the steels containing up to 0.6-0.8% tin, tin has practically no effect on the tensile strength, while with higher amounts somewhat decreases the maximum stress. Even the smallest amount, however, lowers the shock resisting properties of these steels, and if the tin content exceeds 0.2% the effect is serious. This effect is much more detrimental if the steels are tempere d at a low temperature, or if they are allowed to cool slowly after tempering. The ill-effect of tin on the impact strength of these steels may be minimized by quenching after a full tempering.
The influence of tin on case hardening process has been examined and as a result, it may be etated that the presence of tin injures the diffusion of carburizing.
As for corrosion resistance, tin bearing steels are more resistant to atmospherie and some acid attack.
