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Thanks for the replies. The requirement for Charpy CVN average is ? 34 J at -20 deg C. Operating temps are as above no lower than freezing; will be used underwater. Microalloy is on the notepad here too, but I understand elongation will suffer. Bending is a preferable failure mode for us than...

The parts are arms on a device that will be subjected to both tensile and lateral loading. The incentive is just design and weight efficiency; we want to design in geometry that does much more for strength and performance of the part than we can do with plate. The competition does something...

I'm talking about chain that's already been HDG by the manufacturer. I'm interested in two aspects - the likely true characteristics of their product as new (essentially damaged by the dip?), and the prospects of future maintenance.

ACCO describe their G70 material as "high strength heat treated steel". They used to offer it galvanized but current catalog omits the option. Maggi in Italy still do HDG G70...

Good. What can we say about the effect of the heat of the dip on G7 heat treated carbon steel?

Obviously it will depend on the maximum boat size together with the maximum winds and surge at the location. The ABYC did some experimental figures for anchored boats, you can find it formularized here: http://alain.fraysse.free.fr/sail/rode/rode.htm Other data relating to anchoring (remember...

I have a general query relating to the HDG of G7 (700 MPa) high tensile steel chain. Unfortunately I do not know the composition or treatment of the steel, only that it's sold by apparently reputable manufacturers in a HDG finish. I have been trying to work out if the heat the chain is exposed...

Thanks for the replies above. Mike, you are correct there is much info re 2304 vs 316 but I am having trouble translating it practically to the marine environment. We don't care about conditions outside this or extremes. I have already spoken to Sandvik for one. Of course 2304 is not a casting...

I'm in the process of spec'ing a cast stainless for a marine product which will be submerged during use in salt water in a wide variety of locales, operating temperature range of say -5 to 35 deg C, and exposed to salt atmosphere outside when not in use. Most/all competing products use 316/L...