Source for 15lbs Impact requirement

[WeldingPartner]

Hi,
In the BPV world, working with CMn steels you are often confronted with values as 15 lbs av. impact requirement with one testvalue not below 10lbs. I realised not to know for sure where these values origine from.
If you do, please let me know.

Thanks in advance.

Weldpartner

 

[insult2injury]

It should be in the appropriate ASTM specification.

I2I

 

[WeldingPartner]

Hello Insult2Injury,

Thanks for your response. Ofcourse you're right.

Best Regards,

WeldPartner.

 

[metengr]

The CVN impact value requirements originated in various Codes of Construction, as well, in this case ASME B&PV Code, Section VIII, Div 1.

 

[WeldingPartner]

I followed the advise and I found indeed impact values, but..not for ASTM A106. Are there maybe referenced sources, from which an impact requirement of 15 lbs min. for ASTM A106 Gr B appears?

Thanks in advance.

 

[WeldingPartner]

Hello,

The answer reached me already: ASME VIII Div 1 UG 84 gives minimum charpy impact test requirements, for steeltypes with different yield strengths.

Please let me know if you have additional info,

Best regards.

 

[SnTMan]

WeldingPartner, various general material specs can list other values, such as in SA-20.

Specs for impact tested materials such as SA-350 will have their own values as well.

Otherwise, UG-84 is it.

Regards,

Mike

 

[JoeTank]

The 15 ft-lb criteria came from 1940s and 1950s research on brittle fracture related to the Liberty Ships built during WWII.

Joe Tank