What's the Better Material - En24 or En19?

Hello "Guest"

The 22HRC is the heat treatment.

Refer: http://www.dswmould.com/japan/mold_standard.php - sorry, link no longer available

Try: D2 in the following table of "Normal Steels".

Advise here, if that assisted you, with

Kind Regards....

Sparky, an interesting chart. I've some experience here in the States using a toolsteel "D-2". It has ~ 1.2% C, 12-14% Cr. We used it for rubbing wear resistance, as after Air hardening & tempering it had free chromium carbides.

I wouldn't think of using this for a critical strutural anything.

Is it possible that there are two D-2's in the world?

Hello sidevalveguru

Your D-2 is as you say, a specialised Tool Steel.

The D2 in the above chart, is not D-2, but is D2, of maker: ASSAB XW41

I will say that having International Steels of both D-2 and D2, could end up with complications.

But that's one good reason to have Engineers, who are able to distinguish the difference, and advise.

Kind Regards....

If you have to choose between En 19 and 24, I suggest En19 being inferior to En24. However, for shear pin application , depending upon hp transmitted, En 8 is recommended.

karan

shear pin must be designed depending on its shear strength or tensile strength, but hardness is insufficient to determine the ability of material to carry shear stress, if it is hard to test the original part to determine tensile strength, you may analyze this part to determine its chemical composition and select similar material in chemical composition.

Note: you'll need to heat-treat this part.

"Note: you'll need to heat-treat this part."

This raises a concern: when i started reading i took the term 'shear pin' to mean a safety device, intended to fail first. In this case the most expensive error would be a pin too strong.

Previous reader engabdou1 appears to have taken it as a link pin of some sort; where additional strength or wear resistance could be an asset.

One would harden a shear pin so that it become brittle hence it'll just snap off will min deformation.

You'll need to find out the shear that the original pin was design to. Or max torque/shear your machine is designed to. Then you'll calculate from material you choice and the heat treat at the end the crossection area needed at the shear point. Find a way to test them before you install them.

If the pin sheared, you have exceeded the limits. Before you replace it {even with something harder} you need to look into why it sheared off. If you do, you will cause the problem to move to the next weaker point. You need to look for the root cause.

1- you look in a table and see which yield and ultimate stress corresponds to the 22 HRC obtained by heat treatment.

2- you look at the reason why the pin sheared.

3- you look for the reason a shear pin was put in the transmission and if a stronger one will lead to an other type of failure

4- you try to find a steel which has same characteristics as the one you have if you eliminated the reason for its failure and make the pin of it.