A professional failure analysis is needed. You have a problem if Ti type 2 is corroding. Hydriding under certain conditions is one of the few failures we have seen in
ti- 2 . The other is accidental exposure to HF.
The ratio of aluminum to iron is important in these grades in addition to the quantity. I recommend getting an experience foundry to make castings. Also , the cast compositions may not forge well.
Production or refining. Two different worlds. In a refinery stainless steel means 304, in production it means 13 Chrome. In a refinery 4130 is unweldable , in production ,it needs a high preheat.
May be obsolete but Amoco covered many old bottoms with fiberglas / polyesther. Some FRP bottoms had to be 30 years old when I retired but I did not hear of problems ( I should have because I wrote up some of the procedures). Often these tanks were in locations where ground water was monitored...
The materials will have limited life in the location, depending on which "stainless steel" . What is the intended life ? There are various data sets for seacoast exposure such as INCO /Huntington but I can not give a web site.
The B method was put in by Shell when I was on the committee in the 80's and 90's. At that time I don't recall any company but Shell using it routinely. At that time people who wrote the NACE documents got no compensation from NACE. NACE Staff did the editorial and publishing work...
That is going to depend on the industry; The materials used and he environments. For example stress corrosion cracking of modest strength carbon steel occurs in gas pipelines and almost nowhere else. And you are not going to see titanium hydriding unless you have titanium equipment.
When I have looked at used gas turbines for purchase, they looked good. Darkened with oxide, but no erosion, no deposits , no odd surface patterns ,( they were all J-47 if I remember right). I think a lot of explanation and verification is necessary to consider that machine. Also, we were using...
NPT is not API. The most common API is generally called "8 round" and is similar to NPS. API also has buttress , 10 round, and a few reverse engineered proprietary threads like PH 6. I will mention there may be a hundred different proprietary threads used on API casing and tubing.
Still looks like service deterioration; possibly a failure of blade coating ; also some service deposits. 13 Cr is the main material of steam turbines that I have seen . Only problem is GE uses high hardness and occasionally can hydrogen stress crack /corrosion fatigue. Lower hardness-no...
