Lathe tool materiall chart

Hi, has anyone got a chart explaining the hardness / material used on lathe tools...

Ie....H5, and M2

cheers

There is a chart explaining the HSS alloys here.

 Composition and hardness info here.

Thor

Edited By Thor on 30/12/2019 18:04:56

How much do you know already about the relationships between hardness, tensile strength, fatigue resistance, etc, under different conditions (such as annealed, normalised, fully hardened, etc) in relation to the various steel recipes? M2 is a steel designation, in the USA (and so, lots of places too), and H5 is a tolerance system for holes and spindles etc, but there is a long explanation for each of these terms.

Do you have access to any engineering reference books (such as Machinery's Handbook - there are others) where some of the terms will be explained? Or have you considered reference to Wikipedia, for example? And how well up are you in the world of metallurgy?

Sorry, but until we know quite a lot about your existing understanding, any explanation is likely - at one extreme - to be completely over the top, or so elementary as to be offensively patronising at the other.

Looking forward to a summary of how deep you have got, so far.

Regards, Tim

Sorry - system overload, I think, so it arrived twice.

Regards, Tim

Edited By Tim Stevens on 30/12/2019 18:33:38

H5 is/was a designation used by Eclipse, and possibly others. I have several HSS toolbits wtih this marking but I've no idea of its meaning, though I guess it's a non-cobalt material.

Clive

A 76 page thesis from 1922 is available for free download, here: **LINK**

https://scholarsmine.mst.edu/masters_theses/5036/

... ‘enjoy’

MichaelG.

H5 is Eclipse designation for 5% Cobalt used in their lathe tools ..

Thanks guys...👍