inconel 625 for a blade?

J

J-woe

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Mar 10, 2008
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A friend of mine just gave me a piece of 1/8" inconel 625 and said I should use it for my next blade. Anybody ever heard of this before? I am skeptical as per my research I don't think it gets hard enough. Any comments or suggestions appreciated.
 
Inconel is used for high temp cutting blades. Can't say for sure, but I hear tell that you cant get a good edge (compared to tool steel) but it certainly gets hard enough. If what I hear is correct, it may mean that the 'grain' size is large or poor impact resistance.




I have a round bar of it that I plan to make guards and bolsters from.


Alloy 625 has three basic heat treatments:
(1)High Solution Anneal - 2000/2200°F (1093/1204°C), air quench or faster.
(2)Low Solution Anneal - 1700/1900°F (927/1038°C), air quench or faster.
(3)Stress Relieve - 1650°F (899°C), air quench.
The time at the above temperatures depends on volume and section thickness. Strip, for example, would require shorter times than large sections. Temperatures for treatments No. 1 and 2 are generally held for 1/2 to 1 hour, 1 to 4 hours for treatment No. 3.
Treatment No. 1 is not commonly used for applications below 1500°F (816°C). It is generally used above 1500°F and where resistance to creep is important. The high solution anneal is also used to develop the maximum softness for mild processing operations such as cold rolling or drawing.
Treatment No. 2 is the used treatment and develops an optimum combination of tensile and rupture properties from ambient temperatures to 1900°F (1038°C). Ductility and toughness at cryogenic temperatures are also very good.
Treatment No. 3 is recommended for application below 1200°F (649°C) when maximum fatigue, hardness, tensile and yield strength properties are desired. Ductility and toughness at cryogenic temperatures are excellent. When a fine grain size is desired for fatigue, tensile and yield strengths up to 1500°F (816°C), treatment No. 3 is sometimes used.
 
figure a rockwell equivalent of around 45-ish I think, I wouldn't use it for a cutting implement. If you are really serious about wanting to make a blade out of it I can probably find out more for you.

-Page
 
sunshadow said:
figure a rockwell equivalent of around 45-ish I think, I wouldn't use it for a cutting implement. If you are really serious about wanting to make a blade out of it I can probably find out more for you.

-Page
Click to expand...

inco 625 is used for high temp or high corrosion resistance. Not a good material for blades. Not hard enough. Oh, and an absolute bear to machine.

Rockwell hardness is below 30

first link is a data sheet for inco 625 that gives the tensile strength.
http://asm.matweb.com/search/SpecificMaterial.asp?bassnum=NINC33
Second you gotta input the Rockwell and it gives you a tensile strength. Matches up at less than 30 HRC

http://www.unified-eng.com/scitech/hardness/hardness.html
 
Absolutely terrible for a blade and as well for guards and bolsters.Low RC and machining will drive you crazy. Just drilling holes is a pain. Save yourself time and money and go with standard materials.Dave:)
 
Thanks for your help everyone. That settles it I'm sticking to steel for my blades. Maybe I can find something else to use the inconel for.
 
If you want to have an idea of what it is designed for go to specialmetals.com (my new employer and the manufacturer of Inconel) we have tech info in PDF form. If you need to make high temperature fixtures for in your heat treat oven, you can't beat Inconel or Udimet. If you want a cutting instrument use steel or ceramic, if you jwant a cutting instrument that is a lifetime tool that you can hand down to your grandkids, you can't beat good old high carbon steel

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