Test temperature of charpy impact of API SPEC 5CT, AISI 4140 L80

[Edwin Madamby Pauly]

Hi,
Am working as quality engineer in an API licensed oilfield manufacturing facility.
1. During verification of MTC for recently received AISI 4140 L80 material, It is mentioned as "Charpy impact(J)@-60℃", but API Spec 5CT requirement for test temperature is "The test temperature shall be 0 ºC
(32 ºF) for all groups except Group1, Grades J55 and K55".
When i ask for clarification on this, they replayed as "Due to complies all of our customer spec usually we are buying material with high cold charpy (@-60°C)".

Is there is any advantages by performing charpy tesg @ -60°C?.


Thank you.

 

[metengr]

The only advantage for your application is that testing at such a low temperature (-60 deg C) and meeting the minimum CVN requirement at this low temperature will ensure you meet the minimum CVN requirements at 0 deg C.

 

[Edwin Madamby Pauly]

Okay, Thanks for the information.