I stared golf with a set of acuity clubs. I then bought TM RBZ Irons which I love. They don't feel or sound anything alike.
My GF has a set of MaxFli, they all say stainless steel on them.
Can someone shed some light on this?
Steel companies have “recipes” for hundreds of types of steel, so golfdom has a lot to work with.
Here's details on a few companies:
Ping uses a soft 8620 steel in its forged Anser irons, and 17-4 steel (probably the workhorse metal for modern irons) for its I and G-series irons; some models also have tungsten toe weights.
Titleist uses 431 steel in the AP1 / mild carbon in AP2 / and mild forged carbon in the CB Forged and the MB Forged. The two AP variants also contain have tungsten for internal weighting of the heads. (CB and MB contain no internal tungsten weighting)
The Mizuno 2013 Golf Collection catalog identifies 1025E Pure Select Mild Carbon Steel as the metal used in its iron heads, and gives an overview of its forging process.
Irons made of really hard steel tend to more difficult for clubsmiths to bend (you can break them) than those of softer steel.
(Note: Titleist and Ping websites both have excellent archives on past models of clubs).