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Anonymous Poster

What's the Better Material - En24 or En19?

08/16/2008 8:12 AM

I have an original shear pin material unknown Engraved TBr=1500 Nw

checked the hardness is 22HRC

Iwould like to know which material I should use to machine the shear pin

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#1

Re: What's the Better Material - En24 or En19?

08/16/2008 7:40 PM

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".

2.Normal Steel

International code AISIEurope code DINSteel brandFactory hardnessAnti-stress strengthHeat treatment methodCategories and applications
1045 1040 10501.1730ASSAB 760 K-100 DAIDO P113~18HRC600N/m©OWater quenchingKing brand, usually for die holder plate, ejecting pin plate, support head and curb pin
P201.2738ASSAB 718 DAIDO P88X,P-5 DESHENG 2311 A FINKL P2028~32HRC915N/m©O~
1100N/m©O
Usually for inner die inlay partsNo hardness but common plastic inner die is needed.
P20H1.02711ASSAB 718 HI DESHENG 711 A FINKL P20H35~38HRC1000N/m©O~
1200N/m©O
No hardnesscommon plastic inner die is needed.
H-131.2344ASSAB 8407 A FINKL H13 DESHENG 2344 ESR190 HB
(12HRC)
650N/m©O
(hardness to1400N/m©O)
Fine inlay piece wind quench large inlay piece oil quench double temperingDo not be used for die, ejecting, skate board, and ejecting pin, hardness to 48~52HRC
0-11.2510ASSAB DF-2 DESHENG 25100180H-220 HB (10~18HRC)Oil quenchFor low temperature working skate gasket, inlay and strip hardness to 54~56HRC
S-7ASSAB S-7 DESHENG 2379200HB
(15HRC)
At least three times tempering for oil quenchUsually for shock die, press board and gasket hardness to 54~56HRC
4201.2083STAVAX S-136 A FINKL 420 DESHENG 2083 ESR180~200HB
(10~15HRC)
High temperature tempering
915~
1200N/m©O
Double tempering for oil and win temperingcommon application:48~52hrc
mirror polishing piece is needed:52~54HRC
injection PVC piece:46~48HRC
420H1.2316S-136H DESHENG 2316 ESR32~34HRC915~1200N/m©ONo hardness is neededIt fits for injection pvc with good corrosion resistant property.
P41.2341ASSAB 841695~100HBSurface carburizationCladding steel: for complex mode steel, duplicate money and button (rarely use at present)hardness to 62HRC
D21.2379ASSAB XW41210~240HB
(15~22HRC)
tempering for oil quenchCooling steel: for die, pin, inlay, wear proof piece and plastic material diving inlay
BeCuMOLDMAX DESHENG B240~42HRC1240N/m©OAge hardening (330¡æ/3hr)Beryllium copper: Featured by fast heat transmission, it¡¯s useful to go where the water can not reach.
A1-BronzeCup copperIt is harder than bronze and fits for inner mold cavity inter-lock, which can reduce working loss.

Advise here, if that assisted you, with

Kind Regards....

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#5
In reply to #1

Re: What's the Better Material - En24 or En19?

08/17/2008 7:05 AM

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?

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#7
In reply to #5

Re: What's the Better Material - En24 or En19?

08/18/2008 1:40 AM

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....

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#2

Re: What's the Better Material - En24 or En19?

08/17/2008 3:31 AM

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

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#3

Re: What's the Better Material - En24 or En19?

08/17/2008 5:30 AM

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.

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#4
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Re: What's the Better Material - En24 or En19?

08/17/2008 6:53 AM

"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.

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#8
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Re: What's the Better Material - En24 or En19?

08/19/2008 4:40 PM

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.

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#6

Re: What's the Better Material - En24 or En19?

08/17/2008 6:54 PM

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.

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#9

Re: What's the Better Material - En24 or En19?

08/24/2008 8:02 AM

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.

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