Recent content by nickt1960

I was wondering whether I could use 316 in lieu of 304 for low temp applications down to -196 C? I am trying to ban all 304 from our site for pitting resistance reasons but have been told we need 304 to achieve the required properties down at these temps. As far as I am aware 316 would be equal...

I don't have cryo experience and was wondering whether I could use 316 in lieu of 304 for low temp applications down to -196 C? I am trying to ban all 304 from our site for pitting resistance reasons but have been told we need 304 to achieve the required properties down at these temps. As far as...

I have had some s/s balustrading installed at home which has already started "tea staining" after just a couple of months. We are at least 10 km away from the coast, and hence insisted on using 316 s/s instead of 304. I am convinced that the fabricator has used 304 for some sections of the...

I too work for a multinational oil & gas company and you should tell your client that we normally prohibit using Co-60 for NDT work as the sensitivity is so low it is not worth the radiation risk to all and sundry. You should ask him whether he truly wants to find defects or does he just want to...

Is it correct to say that with TMCP steels being rolled at various temperatures and in various directions(???) - that rolling direction is no longer an issue for cold forming of a TMCP plate?

A contractor has approved a procedure using 309 SS to weld a A36 support shoe to the re-pad on S31803 DSS piping (repad is of the same piping material). We normally specify a DSS filler for welding DSS to CS. We are thinking that 309, being a high alloy austenitic stainless in dilution with...

Thanks one and all!

I should have added that the cladding process is mechanised TIG. Cheers

I am reveiwing a contractor WPS for cladding F65 forging materials with 625 CRA in two layers up to 5 mm thick. Base material qualified is for 25.4 mm upwards. I note that the procedure is qualified with PWHT at 600 to 630 Celcius at one hour per inch - max 3.3 hours. I am uncomfortable with...

May I ask which mill the valve came from, or as importantly was it manufactured and tested in Korea, China or Eastern Europe?

Our contractor, has passed on the following response from the flare manufacturers/designers. There is some H2S in the LP & tank farm flare streams (0.01 and 0.04 mol% respectively) which the vendor indicates will be a problem for the nickel alloys (800, 625) and as such they propose 310/316 for...

Yes, I didn't consdider it to be a temper treatment, that makes more sense than a stress relief. Translation problems! Many thanks

We are procuring line pipe and bends out of Japan. Material is Dnv-OS-F101 Grade 450 (X 65 equivalent), seamless 4" diameter x 7.4 mm wall thickness. The line pipe undergoes a Q & T during manufacture. The mother pipe that is then used for induction bending may or may not be put through post...

Just to add weight to this discussion, in the offshore oil and gas industry the use of 304 for topsides applications is universally banned by all the majors. We not only require 316, but usually specify 316 with a guaranteed minimum 2.5% Mo content to ensure the required pitting resistance. Most...

Gents, I would just like to add one more point. MT is the prefered NDT method to PT on castings due to the porous nature of castings versus other forms of manufactured steel. The other weakness with PT is that it can only detect defects that are physically open to the surface, wheras MT will...