Yield Strength of annealed A-2?

[F. Allin Kahrl]

Does anyone know it or know where I can find it?

Thanks!

-Allin

 

[mete]

That's a strange request ! Tensile strength would be about 100,000 PSI so yield strength would be about 80,000 [ ??]

 

[SteelDriver]

Yeah Allin, tell us why you need to know.

From the Carpenter Matched Tool and Die Steels booklet, annealed A2 has a maximum Brinell hardness of 228, or about 20 HRC from the hardness conversion table in the back. A graph of tensile and yield strengths on p. 91 puts the yield strength at about 60 ksi (400 MPa).

 

[F. Allin Kahrl]

Yeah Allin, tell us why you need to know.

I'm trying to figure out a reliable way to flatten parts prior to machining, grinding, or hardening. They're strips of A-2, all the same thickness, that frequently come with a hump along the long dimension. I work with a young engineer who has an idea for a die set that might do the job.

What he thinks is that given the thickness of the steel, yield strength, and modulus of elasticity, he can calculate a curve which is equivalent to the limit of elastic deformation past dead flat. I'd then make a die set which follows that curve and then squash a part in it with the hump opposing the curve of the die. If he's correct, the part will bend past flat in the die, but then spring back to flat when pressure's released because any deformation beyond elastic is plastic and will change the shape of the part.

I realize it's a long shot, but it's just too many parts to keep hammering them out with a deadblow.

Edit: ...and yes, the curve in my diagram is exaggerated.

-Allin

 

[mete]

It might be easier to find a better source of steel .I don't quite understand why there would be a hump.If the hump is uniform from part to part you might have a chance, but you might have to play with it for a while and that might not be worth doing.It depends so much on dimensions etc. I sent you an email !!

 

[Steve Hayden]

I get precision ground A2 from <www.flatground.com> and have never seen any with any kind of warping.

 

[Gossman Knives]

I get precision ground A2 from <www.flatground.com> and have never seen any with any kind of warping.

Same here.
Scott

 

[F. Allin Kahrl]

I get precision ground A2 from <www.flatground.com> and have never seen any with any kind of warping.

This is...um, slightly larger scale. These parts are hot-rolled steel that's been Blanchard ground and laser cut. It's not nearly as pretty as the flat stock that most of us use here on the Forum.

-Allin