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Note also that there are a lot of cheap gaskets out there which may deviate (significantly!) in hardness from their certified level. The only way to be sure is to order forged gaskets and have each hardness tested.... Riadsala Metallurgist in the Offshore O&G industry

Careful if considering nickel 718 to ensure it is in accordance with API 6A718 and that they are not over-torqued, and that the hardness is 100% checked to be below 35 HRc, otherwise they could crack if there is any CP near... Z100 super duplex would work also and is commonly used for bolting...

It can be high (>600 HV0.3) after HT. If that's a problem then maybe a look at the process controls may help. Riadsala Metallurgist in the Offshore O&G industry

Try heat treating it at around 600 deg.C for 8-10 hrs(creates an interdiffusion zone between the nickel and the substrate which greatly improves the adhesion). Of course you will then be out with the mil-spec for the coating... Heating and cooling should be controlled so it is not too quick...

Billsummer is right - the flexible pipe is a multilayer construction the inner most layer of which is the carcass (usually of stainless steel) which supports the fluid barrier (PA11 or PVDF or XLPE). The pressure is taken by the armouring wires outside that fluid barrier - a shaped interlocking...

I work for a company making flexible pipe for the offshore oil & gas industry. We use AL2003 as a supporting layer in the pipes as it has good corrosion resistance (>316L) and with the better mechanical properties it aids collapse of the pipe under hydrostatic pressure almost as well as if the...

You could look at Destec flanges also (http://www.destec.co.uk/)

Alumina particles work OK - use 60-80 mesh sized particles; aim for an anchor profile of 2mils (50 microns) average; ensure blast media is dry when used. As a general rule for any blast media it should not be re-cycled (i.e. use it once only) as otherwise the surface finish will be compromised...

Take care using 718 bolts. It is currently becoming very apparent that 718 is extremely sensitive to hydrogen embrittlement under CP. It is vital that there is no delta ferrite in the microstructure (follow API 6A718, however it may be necessary to tweak the heat treatment temperature and...

Interestingly (though you may not be interested) when looking at UNS N06625 inconnel weld cladding (625 inconel overlay welded onto carbon / alloy steel) the hardness of the HAZ is limited to that which applies for the base material but the 625 inconel weld metal has no hardness limit...

Otherwise try the Nickel Development Institute - they recently put a load of their data online! www.nidi.org

Could be Syntactic Foam (a composite of glass bubbles in a polymer matrix). Try CRP Group in Skelmersdale, UK for that.