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Thanks for the input guys, to clarify all the other parts of the analysis fit 304L including Ni levels (albeit right at the bottom of the spec). The supplier has stated that the copper level is for deep drawing applications (not applicable to our use) which fits with hacksaws thoughts. I agree...

The amount of movement really depends on the amount of residual stress after the welding operation and the geometry of the item. It would be complex to predict (as point out by BillPSU) the movement but some educated assessment could be carried out by looking at the longest spans and sectional...

Hi all, Looking at some 304L sheet at the moment with a high copper content of 1.5 wt% which was a suprise!, anyone think of good reasons chemistry may be at this level (everything else within AISI 30L spec) apart from poor scrap availability at the supplier?

Just to add to the good debate started by Chris9, a little experience of my own to help lighten the mood: One leaking bath, two plumbers at £40 per hr plus callout fee failed to fix it. Myself a lowly Materials Engineer admitted defeat and fixed it myself using 5000psi pipeline fittings...

In subsea pipelines we produce we would always use an insulating gasket wherever possible. The use of a coating is higher risk due to possible damage or breakdown, or complications due to any CP applied. However knowing the Destec design I think the use of a gasket is going to be pretty...

The dropped object study is an all too real design case that needs to be considered in subsea structures and pipelines. It highlights the probable impact loads that will be applied as a result of the dropped object. If the water is deep enough object will reach terminal velocity. Examples of...

Agree with Stanweld, it is a rimming steel. My concerns would be poor toughness of the material to unexpected loading regimes, and the variation in cross section. Since I guess these have been in action since 1906 so are likely to have had varied loads applied. Given the possibility of stress...

The dropped object study is an all too real design case that needs to be considered in subsea structures and pipelines. It highlights the probable impact loads that will be applied as a result of the dropped object. If the water is deep enough object will reach terminal velocity. Examples of...

Looking for a cold rolled steel producer in South America, capable of producing thin guage 100KSI grades. Generally ot ASTM A 108 or similar would do. Any suggestions?

You can have failures and passes from the same heat I'm afraid. It suggests the material is near the threshold of resistance to this kind of phenomenon. Suggest you examine the failures to see what the HIC damage is associated, i.e. is it sulphide inclusions, or microstructural variation, these...

Suggest you try an approach on a number of fronts: 1/ Review the forging regime to see if the pre-existing structure has been sufficiently removed (i.e. a minimum of a 5:1 reduction is a good guideline, from starting ingot to final piece (this includes upsetting and becking). This will be...

May sound a bit simple, but since it's only bar stock, to be sure about the material get a piece tested and your local Material Labs or University. A quick micro would also be able to judge it's thermal history. This is the best way to be sure and should only take a couple of days.

The hydrogen embrittlement issue is somethings that really needs to be considered in your selection as Mark62 and TJAvery state. A look through the Norsok standards will give good guidelines on bolt selection through: http://www.standard.no/imaker.exe?id=244 This will irrespective of the...

Many Thanks, I was not looking to scare anyone, under the accidental sewater flooding the compressive and buckling stress the item in subjected to is diminished, due to load sharing. A titanium alloy would work, costing is the issue as ever unfortunately. Looks like a PH grade will the best...

I'm looking for a CRA grade with 1500MPa Yield in tubular or forged condition for use in a pipeline application. The item will only be exposed to seawater in the event of accidental extreme conditions but requires resistance all the same. Size of around 400MM OD with a maximum wall thickness of...

A good site to try is www.nidi.org

Suggest replacing the 316L with an Inconel seal ring to match the ring groove.

Depends on the conditions you have in there, is it allwas stagnant seawater? This kind of arrangement is common, but in this case you may be building up problems for yourself, with even a slight galvanic effects making things worst. If you've got the cash suggest Inconel seal rings and sleep...