ok. my dear friend.. to me.. all metal are good. it depend on what and y u need it for.
there are many steel.. some steel are used for construction, some in product design... and of cos.. knives ,blade , cutting tool .
just to give u a little mechanical knowledge on steel (cutting steel)
there are two big category.
1) stainless
2)non-stainless
for non stainless steel, this steel are very easy to rust, super easy to rust. but very very very easy to sharpen.. usually used as parang (did i spell this correctly)
for stainless steel... ahahh they are all this steel that we collect.. 154CM, ats34 , BG42 etc etc... cpm etc etc. they are more resist to corrosion but ... they can still rust if not taken care off...
ok.. in metallugry.. there are some point u have to know...
if your blade is hard... then they are not strong as they are brittle
if your blade is soft... than they are strong as they are not brittle
hard blade does not mean that they are do.. its just that theyare harder to be indented when the blade surface is in contact with the surface ....
as we ,, our daily lifes... we dont need to cut super hard material... so u dont really need much hard tool.. for leatherman.. the blade is made of 420J rockwell scale to about 54.. are my great working tool. if you are uing m2 high speed steel or ATS 34.. then i find its really too hard.. remember.. hard .. your blade will chip off.... then keekek.. think about it.. and if u buy BG-42.. its very hard to sharpen.. if u need me to explain y.. i need about 3 A4 paper to write out all the thoery.
softer materail will not chip off easily. but of cos.. easiler to blunt but easy to sharpen.
for the super alloy such as (remember ATS and 154CM are not under superalloy steel category) wait.. i think u like harder materail
let me explain the CPM (Crucible Particle Metallurgy) such as cpm440v, cpm10v, cpm 15v..etc..
this are called the super alloy.. they have super edge retention, must better than 154cm steel(154cm steel edge retention is better then ATS-34) but but but the hardness level (using the rockwell scale) is about 55 to 57... as compare to 154cm which is about 59 - 61. all this factors are due to the carbide in the material...
as to let u know.... rockwell scale which u used to determine the hardness of the blade are very not accuracte but the industry used it as it is very easy to test. there are many many other theory behide this area but i am not going to explain it here as it really going to take me days to explain.
so.. for your knife... u dont have to really go for hard metal...
for examlpe.. ats 34 , 154cm is about 60, gin 1 is also 60 but gin 1 has got better corrosin resistence and can go for water sport yet much cheaper. do u know that the leatherman.. the piler is only 48 to 49 hardness using the rockwell.. u know y... ? bcos , if u used a 60 hardness piler... i think u going to break the piler as its too hard...
ok.. after so much no sense theroy... u have a better picture of metal..
cheers...