Read an article online about the Ruger metal in their pistols being soft and dents easily. Anyone hear this, I know I have never thought of my Ruger SR9C or my SR1911 as having softer metal.
Steel castings tend to have better weldability than steel forgings.
Steel castings lend themselves more easily to complex shapes than do steel forgings.
Unique chemistries tend to be better (less expensively produced) with steel castings. Also, the class of steels commonly referred to as “work-hardenable steels” (13% Mn) are not forgeable, but are readily made in a casting.
Steel castings are ISOTROPIC - meaning “similar properties in all directions”. Steel forgings are ANISOTROPIC - meaning “similar properties in the direction of flow’’. Thus, in the direction of flow (material deformation), a steel forging’s strength is highest along its longitudinal axis, and decreases in the transverse direction. Whereas, in a steel casting, the properties are similar in all directions.
In certain stainless steels, castings tend to have better corrosion resistance than equivalent forgings this is due to controlled amounts of ferrite present in castings.
Steel castings are almost always lighter their forged counterparts “redesign from forgings to castings usually results in substantial savings in weight”. For example - a forged cannon muzzle brake weighed 600 lbs; this same part as a casting weighed 400 lbs. (and lasted over three times longer).