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

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

(OP)
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

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

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.

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

(OP)
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.

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

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.

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

(OP)
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.

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

(OP)
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.


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

Quote:

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.

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

(OP)
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

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