Dear Prem:
I have personally observed hot shortness caused by Copper in cast ASS.
I have personally observed hot shortness caused by Copper in cast ASS.
Material was an old Russian ASS and we were going to do some overlay welding. By the time the material temperature raised, one large crack opened immediately after welding. We conducted PMI and high Cu amount was evident.
Regards
Ramin KondoriOn Fri, Feb 14, 2014 at 7:36 PM, prem nautiyal <prem_nautiyal26@yahoo.com> wrote:
Hi CharleyOur job is a pressure vessel, MOC = 304L and the service is not for sulphuric acid, neither for elevated temp.Its for a Nuclear Power Plant in India.Our project specs. have restricted Copper content to 0.45% for ASS base materials. I was wondering what the reason could be for this.Hence being from client side, I have kept the flanges and plates of fabricator having Cu content greater than 0.45% on hold.RegardsPrem Nautiyal9769316004
On Friday, February 14, 2014 9:44 AM, Charley Sui <charleysui@gmail.com> wrote:
Ahmad is right, Cu will increases the corrosion resistance against sulfuric acid (deliberately added in alloy 20 for such application), but Cu>0.8% may lead to hot shortness, some fabricators limit Cu below 0.5%.Prem,Cu hasn't been traditionally added as alloying elements in austenitic stainless steel, this might be the reason why ASTM specs doesn't address Cu as a controlled element. due to an increased use of recycled SS and other Cu bearing alloys, elevated Cu content is observed but typically less than 1%.
On Mon, Feb 10, 2014 at 8:28 AM, prem nautiyal <prem_nautiyal26@yahoo.com> wrote:
To unsubscribe from this group, send email to mailto:materials-welding%2Bunsubscribe@googlegroups.com--Hi allVessel fabricator has offered SS flanges- SA 182F 304L and SA 240TP 304L plates.After reviewing Lab check test reports and MTC it is observed that Copper content is 0.60% for flanges and 0.69 % for plates. Copper content limits are not specified in the standard and I feel that the copper content is Not Traces and on higher side.I have seen the max limit for copper specified for welding consumables in ASME Sec II-C, SFA 5.4 / 5.9. as 0.75%, but for base materials it is not specified in ASME Sec II-A or ASTM - A182.I have kept the flanges and plate on hold.I would like to know the effect of higher copper content on the SS base material and the reason for addition in SS plates and forgings.RegardsPrem Nautiyal9769316004
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