Proprietary Filler Metals

[meltedEng]

Dear All,

We've developed some new austenitic filler metals for ASME code work. No plans on getting it added to Sec II C. We have done many tests on our test heat and we are satisfied. The question is, for production of new melts, what tests should be done?

After reviewing code I see no clear direction on what the MTRs should contain for each new heat: UW-5 points to UG-4 to UG-15. UG-9 points to VIII, IX, and PQRs in general. VIII and IX appears to be only from vessel manufacturer point of view, not consumable manufacturer point of view, which is no surprise.

In past I see we had other proprietary metals with only chemistry analysis listed, some reports with more, which I questioned during our meeting. I believe this subject comes down to engineering judgement, what is your opinions here? I plan to request SFA 5.4 and 5.9 tests and supply my own criteria for each form.

Is there industry standards, technical reports, or a recommended practice on this?

 

While using the Code is a process of connecting the dots (all those clauses you cite), it is also necessary to understand the logic. Engineering judgment must always be in play (in fact that is mandated explicitly).

I have never faced your problem, but availing yourself of a 'G' category in section II-C could be one approach, especially if the differences between your filler and an established classification are minor. The chapters you cite indicate stainless steel, so you are probably not far away from an existing classification, meaning that you will have a guide to the significant characteristics such as strength, corrosion resistance, weldability, stability, etc.
Normally I frown on the use of G classifications, because it often isn't actually necessary, it's just shenanigans by manufacturers. Other times it is necessary, and in fact I am currently involved with such a customized low alloy filler metal (I cannot say more than that). If you are not an established filler metal manufacturer, you may not know about the know-how and secret sauce that go into making a functional product.

If you ultimately want a material included in the Code, the first step is initiating a Code Case. Which requires a lot of real data, but hopefully you are doing a lot of development work in any case, for due diligence. I would get in touch with your local Authorized Inspector as a starting point.

Hopefully you are taking steps to protect your IP (including a secure server protected from prying Chinese eyes).

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."