ASME Section IX Table QW-442

[rmillercwi]

I have a client requesting that I confirm our vendor can comply with the following requirement:

"Mild carbon steel filler metals with ASME Section II Part C composition ranges that can extend beyond the ASME Section IX Table QW-442 A-1 chemistry limits (i.e. ER70S-6, E7XT-1, etc.) must be controlled to meet A-1 chemistry"

I am a bit out of my element with this. How exactly would I confirm this?

 

[DVWE]

An issue within the industry for a very long time.

Take for example ER70S-6. The chemistry ranges according to ASME II, Part C allows Si and Mn to have a maximum of 1.15 and 1.85 respectively. This falls out of the maximum allowables listed in table QW-442 for these elements. Most manufacturers are well aware of this issue and most of the ER70S-6 meets A-1 chemistry.

So you confirm with either actual MTRs supplied by the filler metal manufacturer, or you perform a weld button chemistry analysis.



The devil is in the details; she also wears prada.

 

[rmillercwi]

Thank you. Thats how I assumed it would work.

I have another question. 1 of two fabricators chose to use ER70S-6 and the other ER70S-2. I would have expected both fabricators to use ER70S-2. Is one or the other (ER70S-2 VS ER70S-6) more or less likley to be in compliance with A-1 chemistry?

 

[DVWE]

Not in my experience.

The devil is in the details; she also wears prada.