Can 4140 heat treated groove pin be used at -49F? 1

[ProjectEng99]

I want to use a 1/2" dia pin in shear at -49F but am concerned about it being brittle at -49F.

Are there cold temp tensile & impact properties avail somewhere?

I am considering just making my own pins from A479-XM19 stainless if I can't use these off the shelf pins from Driv-Lok.com. I called the vendor but they have never been asked this question.

Thank you!

 

[salmon2]

I got no data to show you, but what I know if you switch to 4130 you chance of success will be higher.

 

[metengr]

ProjectEng99;
One question; does the pin see impact type loading conditions in service at this temperature?

 

[ProjectEng99]

Salmon2 - thank you, if I stay with a carbon steel I'll ask if they have 4130.

metengr - yes it will have impact loading, but the impact shear load will only be about 9,000 lb versus the rating of 21,000 lb for this particular 1/2" dia pin. UTS approx 110kpsi.

 

[CoryPad]

I am not aware of any standard for pins used in low-temperature environments. ASTM A 320 is a standard for bolts used in low-temperature environments. Since bolts are very close to pins, I think the following should be helpful.

4140 (known as grade L7) is one of the standard materials. The standard requires an impact strength of 20 J when tested at - 100 °F with the Charpy test method. To achieve this, the strength is limited to 125 ksi, and hardness limited to 235 HB or 99 HRB. The phosphorus concentration is limited to 0.035 %, and sulfur is limited to 0.040 %.

Regards,

Cory

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