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The information I provided in the two numbered statements was quoted from an e-mail response I received from the manufacturer. I agree it is lower than I expected. On the other hand, I noticed that the allowable S and P in the spec are somewhat higher than I expected, at least based on my...

Metengr - I was able to learn the following for A514 gr. F1: 1. In the longitudinal direction at +32 to +80 degrees F, we would expect a minimum of 30 ft lbs. 2. There are special melt practices and other processes that could possible improve toughness. There are different grades of "T-1" so...

keep in mind that with galvanic corrosion there is more to consider than just the potential difference. The relative area of the anodic vs cathodic alloy is also important and can have a strong effect on the rate of corrosion. Small anode w/ big cathode = worse than the reverse stituation.

Per the input from GRoberts, this is common and the applicable construction or fabrication code or stabdard will often specify the maximum allowable mismatch in thickess. Greater mismatch is usually accommodated by: 1) taper bore at an angle or range of angles specified by the code or...

Can anyone provide approximate or typical Charpy impact toughness results for A514 B / T-1 steel in temperature range of roughly about +32 to +70F. Thickness range about 1-2 inches. I have found information on transition temperatures but I need an estimate of Charpy ft-lbs for the approx...

B31.3 references the requirements of Section IX and does not prohibit GMAW. Your Section IX procedures should be OK as long as the qualified joint designs and other essential variables meet the requirements of the B31.3 application, you have good confidence in the current skill level of the...

as noted by SWAL in his message above, there are small differences in Cr content. I believe that www.matweb.com has composition listings for both versions of the alloy.

Excellent information and thanks for the link to the previous post. The referenced alloy (A356) in the other post is one that is alreadys being considered as a replacement material. I went back and looked at the reported composition of the current alloy. It was reported as A242 but the...

Not sure what, if anything other staff learned from Franklin. I stepped into this problem only recently. Part of the challenge of an air museum with 60+ year old aircraft, some of which were experimental, is that we are operating components far longer than originally envisioned by the original...

Excellent point regarding the fatigue issue. I have fatigue properties for this alloy and candidate replacements at room temp, but I assumed elevated temperature fatigue properties would be really hard to find, given the difficulty in finding static properties at elevated temp. Therefore, I...

The chem analysis results we received from an analytical lab identified it as "A242" but also as "UNS A02420 sand cast aluminum". It is definitely aluminum and definitely not Corten steel. Sorry for the confusion in designation

The volunteer staff at a local air museum are doing an analysis of recurrring cracking on a 1940s vintage Franklin engine. The A242-T21 cast aluminum heads are threaded onto a cast iron cylinder. We can't find elevated tempertaure tensile properties (Yield and UTS) for the A242 in the T21...

I recommend getting on some of the air museum websites, especially the nonprofits. Several have library staff with access to a wide range of T.O.s and other technical guides, including those for aircraft not owned or operated by the museums themselves. Just do a web search for air museum and...

Can anyone provide typical tensile yield and ultimate tensile properties for A242-T21 aluminum sand castings? Temperature range of interest is up to 400 deg. F. I have only found room temperature properties for that particular heat treatment. Application is a 1940s vintage aircracft engine...

A proper fitness for service evaluation considers the potential for excursions in temperature and stress, and the potential for fatigue. Therefore, engineering judgement is an important contributor to successful application. In addition, the analyses include consideration of the tolerances on...

Metengr - The answer to your question regarding why ASME would settle for less quality is related to the whole premise behind "fitness for service" and is an easy one to answer. Workmanship criteria is a one-size-fits-all approach that sets acceptance standards based on an assumption that...

The API 1104 pipeline welding standard includes an option (Appendix A) for use of a fitness for service or fracture mechanics-based approach for evaluation of girth weld flaws in new construction. Is there any parallel option for new construction welds made in B31.1 or B31.3 piping? In my brief...

API 1104 pipeline welding standard includes an option (Appendix A) for use of a fitness for service or fracture mechanics-based approach for evaluation of girth weld flaws in new construction. Is there any parallel option for new construction welds made in B31.1 or B31.3 piping? In my brief...

Someone outside this forum pointed out to me that Append. IV of B31.1 does reference ASME B31G as a source of "An acceptable evaluation procedure..." EPRI Report NP-5911M is also referenced. However, the references are included in section IV-5.0 which relates to erosion corrosion. IV-5.1...

Thanks Metengr - yes this question is related to corrosion detected during an in-service inspection. It is not related to new construction. I knew B31.1 relates to new construction but am hoping to find something in writing in another code or standard that states that the guidance in that...