Can the filler metal and WPS for ASTM A757 Gr C1Q be used for A1Q

[DAVIDSTECKER]

I am currently working on a WPS and qualification for ASTM A757 GR C1Q castings but now a project has come up that would require A1Q.
My current wire is E81T1-Ni1.
Other that a slight overage on tensile and a 300F preheat vs 50F, would there an problems with using the WPS for both grades of material?
Both grades are to be Charpy tested @-50F.
Best regards, David

 

[metengr]

What P-No was assigned for this material? Or was it unassigned? You need the answers to these questions before I can answer your OP.

 

[DAVIDSTECKER]

According to ASTM A488; C1q is Category 6 and A1Q is a 1.
The filler metal I have selected is ESAB Dual Shield II 80-Ni1 H4.

 

[metengr]

No. The question is what is the assigned P-No for the two different Grades? The reason is to determine if a single WPS can be used or you need two separate WPS's.

 

[DAVIDSTECKER]

I looked up P numbers and found a list from ASME.
I have been reading through a variety of specifications lately and there material numbering seem to be very similar.
Most reference plate and structural type materials so I am making comparisons.
The only Cast material list I have found is in ASTM A488.
The A1Q is listed as a mild steel, Category 1 and also A1. It is to be quenched and tempered.
The C1Q is listed as Low-alloy (Quenched and tempered)under the Category 6 list and Chromium-martensitic in the A6 listing.
I plan on using the C1Q WPS which ASTM A757 states that Preheat is 300F and a Post heat of 1,100F with low cooling.
The A1Q has Preheat of 50F and Post heat of 1,100F with slow cool.
The C1Q would be slightly over kill on something's.

 

[DAVIDSTECKER]

I have continued to learn more about "P" numbers and I ran across this explanation:



In a nut shell:

******"P numbers are groupings of base metals with similar welding characteristics that have been approved for pressure boundaries when constructing pressure vessels or piping systems. Group numbers are sub-groupings within a P number that further subdivides the P number. Group numbers, as mentioned by John Boy, becomes an essential variable when notch toughness is a code requirement.

S numbers are similar to P numbers, but materials listed are not approved for pressure boundaries. They can be used in situations where there is no pressure differentials involved. I like to think of those materials as being appropriate for structural application, not pressure containing applications. Some construction codes do permit specific S numbered materials to be used in piping systems, so check your construction code.

Materials listed by ASME in P numbered and S numbered groupings are listed in AWS B2.1 under corresponding M numbered groups. Similar groupings of base metals can be found in NAVSEA welding standards as S numbers (not to be confused with ASME S numbers)."*****




If this is correct then I need to say that the cast products are not for "pressure" vessels although the C1Q is part of the below water portion of a ship's hull.
The A1Q is for the rudder.

 

[metengr]

The A1Q is listed as a mild steel, Category 1 and also A1. It is to be quenched and tempered.
The C1Q is listed as Low-alloy (Quenched and tempered)under the Category 6 list and Chromium-martensitic in the A6 listing.

These will require separate WPS.

 

[DAVIDSTECKER]

Metengr,
Thank you very much for taking the time to help me on this.
I've been doing some more digging around on the net and have learned quite a bit so it's been a very good day for me.
Best regards, David