More Info is required; e.g., API 620 has modifications to A-36 that deal with fine grain melting and further restrictions on chemistry. Certain owners and their engineers have also imposed additional requirements for the material.
You need to provide more information on your application. I have seen reference to A 36 modified in two instances – structural steel and ship hull construction where the yield point is 50 ksi, not 36 Ksi. The reference to ship hull construction was ABS Standards (which are available for free downloads) for our coal barges.
The AH 36 is an ABS Standard, high strength low alloy steel for ship hulls that contains small amounts of copper, chromium and nickel (less than 0.35%, 0.20% and 0.35%, respectively) in addition to micro alloy elements - niobium and vanadium. This steel is produced to a fine grain melting practice with a specified minimum yield strength of 50 Ksi.
Thanks to all for your replies,
Steve in the API 650 reference doesn't it also have Carbon limitations? I was thinking less than .20. Thanks again for the replies I had never heard of the yield point being 50 Ksi until the other day which has brought up this whole discussion in our shop. It seems all of us could be correct.
Metengr, sounds like your ship hull version of A36 Mod is a lot like ASTM A516 GR70 or A572 GR50. From my days doing offshore stuff, those two alloys were de-riguer and A36 was considered pot-metal for all it was worth at low temp. I'd be intereasted in seeing that standard just for grins, can you supply a link to where it can be downloaded?
qgman74, I believe the gist of what everyone is telling you is that MOD can mean just about anything to anyone and may mean different things to different people in different contexts. Lacking a real formalized standard, you are going to need to be a lot more specific as to what the mod means.
Rorschach;
You need to find the web site below, and sign up to access downloads (it is free). Look under steel vessel rules 2005 - Part 2. Find Chapter 1, Materials for Hull Construction,
Higher Strength Steel
