P-Number for 4130? 1

[tc7]

Normalized UNS G41300 alloy (~0.3%C, ~1.0%Cr, ~0.5%Mn , etc.) does not appear to readily crossover to an ASME P-Number. Can anyone suggest an alloy similar which does have a P-number assigned?
Thankyou.

 

[metengr]

tc7;
Here is what I would suggest for you. I reviewed my AWS B2.1 - 2005, which contains a listing of AWS Material Number designations, which can be used on WPS forms.

For UNS G41300, the material number designated by AWS is M-No 11B Group 9.

 

[tc7]

Thanks Metengr,
If I may also ask, how do M-Numbers relate to ASME material P-Numbers? My intention is for a new PQR IAW ASME using a MIG process.

I was once of the thought that ASME forbids the use of any material whose strength can be altered by thermal means. Even though my UNS41300 will be used and welded in normalized state, would I be permitted to use it even if PQR'ed as an unlisted material?

 

[metengr]

tc7;
There are two topics, and I want to make sure that I grasp what you are asking.

ASME Section IX guidelines for WPS and Welder qualification can be used outside of boiler and pressure vessel welding fabrication. In your situation, if you are using ASME Section IX guidelines to qualify a weld procedure, this is permissible and the AWS Material No designation is appropiate to use on a WPS. AWS uses their own material designation that parallel ASME but for only those materials that are endorsed by ASME Section II.

Now, if you are intending to use G41300 for boiler/pressure parts this is not permitted and this is why there is no corresponding P-No. You cannot use this material because it is not endorsed by ASME Section II.

 

[tc7]

Met-
The application is indeed for an ASME requirement. We have an engineering team working on an estimate for Section VIII pressure vessel design. These individuals are accustomed to working with 4130 as their preferred material. My input to them (trying to steer them insofar as their welding concerns)was that I thought 4130 was not a listed material but many many other alloys are available to them. Thus, my original question was for any suggestion of an alloy similar to 4130 in composition that is listed.
The idea is for everybody to stick with what is familiar or somewhat familiar and minimize the unknowns. No matter what material choice is made, new PQR's are a given.
Thanks.

 

[metengr]

tc7;
Ok, you need a material substitution. I would recommend you review the following ASME Specification regarding the pressure vessel material;

ASME SA 202

 

[tc7]

SA-202 Grade B looks like a good start.
But I have to wonder why a heat treatable alloy like SA-266 may be permitted, but 4130 is not? Do you know why?

For the SA-202, would an ER80S-D2 be a fair choice for GMAW? and 9018-M for SMAW?

Thankyou Met.

 

[metengr]

The CE is high in comparison to other low alloy steels permitted by ASME Section II.

For SA 202, I would not recommend E9018 M. I would use E 9018 B3.