the ms point to a level not higher than 350 u00b0 c as the ms point varies with the amounts of ni mo and ti in the steel the amount of the chromium to be added depends on the amounts of ni mo and ti which are so selected as to satisfy formulas 2 and 3 molybdenum and titanium are employed for the precipitation hardening of the steel if their amounts are too small the steel fails to obtain satisfactory strength therefore formula 3 defines the minimum amounts of mo and ti that are required to produce steel of satisfactory strength as the presence of these elements in too large quantities however results in steel of poor toughness their maximum allowable amounts are limited by formula 2 it is theoretically desirable to reduce the amount of carbon as far as possible since it is an element which is unnecessary for the steel of this invention the steel may however contain a maximum of 0 05 carbon since the efforts to reduce the amount of carbon to a further extent result in an undue increase in the cost of production the presence of carbon in any larger quantity should be avoided since it increases the strength of the steel as solution treated and lowers its machinability or workability it is however unnecessary to lower the.