R&D/ Operator

Guest,

You have asked for the steel to be ductile, implying that it yields at a reasonable stress, and extremely resistant to stress (I assume you meant 400,000 psi)? Could you please be more specific in your requirements?

AISI 5160 goes to about 322kpsi. I'm pulling that out of an old materials properties book, so there has probably been progress. I'm responding partly because I'd be interested in knowing too: I tend to think of high strength steels as being roughly 200kpsi materials.

4000Mpa~= 580,000 psi

Nippon steel

http://www0.nsc.co.jp/shinnihon_english/kenkyusho/contenthtml/n88/n8818.pdf

milo

Great link. I've worked quite a lot in the tire industry, and have watched thousands of miles of steel wire being calendered, cut and wrapped onto green tires. I knew it was strong stuff, but hadn't realized just how strong.

Dear Milo, I would like to see more, unfortunately the link is no longer active.

Regards Dragon

It's an interesting paper. The link works from here. I wonder if your Adobe plugin is acting up -- mine has been recently -- things just randomly fail to load.

Kevlar maybe?

Is there any commercial firma delivering any sort of "nanosteel"?

"nanosteel" is not an engineering descriptor. its popular buzz.

Its in the same class of terminology as "lite" "diet" and "Water repellent." There is no diet steel either. Stainless might be said to be "water repellent" steel, but not all are so good at that...

Given the definition of Nano (billionth of a meter) heat treated steel is truly the original Nano material, as the martensitic transformation is at that level of scale.

I hesitated to post earlier "theres no such thing as nanosteel," but from a robust technical engieering point of view, the term is meaningless.

From a practitioner point of view, martensitic treatments and the grain refiner particle size are "nano" scale.

milo

With wire, could not the final Tensile strength be determined by cold work during drawing. This could get you well above base material number.

Steve Guest

Please, Do see figures 2, 3, and 5 in the link in my original post.

They call cold work "strengthening by wire drawing" The figures are pretty clear. PAtenting is heat treating, wire drawing is cold working strain.

heres the link again:

http://www0.nsc.co.jp/shinnihon_english/kenkyusho/contenthtml/n88/n8818.pdf

milo