carbon steel low temperature application
carbon steel low temperature application
(OP)
Does anyone know whether medium carbon steel/medium carbon boron steel components can be stored at -50ºC and serviced at -40ºC regarding to shear and tensile strength? I know generally these steels shall not be used below -50ºC because they will become brittle.
Many thnaks in advance!
Many thnaks in advance!





RE: carbon steel low temperature application
Can you re-state the above, what does stored and serviced mean?
RE: carbon steel low temperature application
If you are talking about pipe or vessel equipment, you've to look for example in Code ASME B31.3 or ASME. You'll find the minimum temperature for the materials you're considering.
hope this help
regards
Vitt
http://www.corrosionist.com
RE: carbon steel low temperature application
Thank you very much for your reply. The materials are medium carbon/medium carbon boron steels and the components are fasteners. I do not know what the application will be, and the only information is the fasteners will be stored at -50ºC and be used at -40ºC.
The fastener has two parts: body and stem. The body is annealed to ~150HV, and the stem is hardened & tempered to 380-430HV. When assembly the two parts to application, the body will be deformed and the stem will be broken at the pull groove. So the stress will include shear and tension during assembly.
Because the body has to be soft enough to deform, and the stem has to be strong enough but not brittle for assembly, I am worry at -50º/-40ºC the material will become too brittle to function properly.
Any advices are appreciated.
RE: carbon steel low temperature application
Do not use this material for fasteners at -50 deg C. For guidance, please see ASME B16.34 for bolting materials that should be used with valve bodies for low temperature service. Medium and low alloy steel with boron will exhibit very poor notch toughness. The issue is notch toughness, not strength at this low temperature.
RE: carbon steel low temperature application
http://www.astm.org
Regards,
Cory
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