EN24T

[Paterson]

Does anyone know of a supplier with EN24T tubing in UK or USA????

Cheers

Craig

[Paterson]

Does anyone know of a supplier with EN24T tubing in UK or USA????

Cheers

Craig

[Jersey Tom]

EN24 if I remember right is basically 4340. Dunno why you'd want it hardened (T). Dunno if anyone supplies tube.. onlinemetals etc have bar stock.

[Alastair Clarke]

Hi Craig,

I've never seen EN24T in tube form. If you want a relatively strong tubing, try T45 - it's a relatively commonly tubing available over here and, like EN24T, has the advantage that it's supplied in heat treated form, unlike 4130 which you have to heat treat post-fabricating to get any real strength improvements.

Alastair

[Jimnik]

Hi,

I've noticed that Elmdon Metals (http://www.elmdonmetals.ltd.uk/) in the UK produces "BS4T45".
Does anyone know the yield strength of this steel?
Or does anyone know the AISI designation for this steel?

[Jersey Tom]

The English system of steel designation really boggles my mind.

T45 steel (BS4 T45) is a Manganese steel, so AISI equiv will be something in the 13XX series. 1340 is pretty common.. yields at 80-ish ksi. I don't know what the carbon content of T45 is.

Anyone know what the numbering system means? EN24.. EN16.. S155.. 15CDV6.. T45.. beats me. AISI and UNS make sense, but the English standard is beyond me.

[Boston]

Are there any other thin walled tubes commonly available with a higher strength than 4130?

[Jersey Tom]

The better question is, what do you guys want this stuff for? Thin wall tube.. I'm imagining you guys are making a chassis or a-arms or control arms or somethin? No parts on an FSAE car are coming to mind right now where a thin-wall 4130 tube wouldn't be plenty strong enough even Cond. N. A-arms.. .625" OD x .028" wall is plenty strong enough from a yield perspective. The whole chassis, if done right, could prob be done out of 1" x .028" wall 4130.. from a purely tensile loading view.

For an a-arm you're designing for stiffness and buckling strength, which are both totally independent of yield stress.

In addition, your part is only as strong as its weakest link, which is either going to be the weld or the HAZ. If you're using 70S-2 filler.. its designed such that the weld itself has a 70ksi tensile strength. Who cares if the tube is rated to 220ksi? And if you start getting into higher carbon-content steels like 4140, 4150, 1340 or what have you, you're going to have some serious issues with hardening and martensitic embrittlement in the HAZ, no? To get any sort of toughness back you'll have to normalize it anyway, negating the benefit of buying stock that has a higher yield stress in the normalized state.

Those are my 2 cents. But it all depends what youre tryin to do with this.

[Paterson]

thanks everyone,

We are hoping to use it for driveshafts.

Cheers for the suggestions, keep them coming.


Craig

[Boston]

I was also considering a half shaft application

[Rob86]

Hi Patto... we have a big bar of EN26 in the uarc shed that we use to hit people over the head with that lift the car by the wisbones and bend rodends... it also made us some sweet driveshafts this year, much better than mild steel apparently.