Re: [MW:20097] Effect of higher Copper content on Austenitic Stainless Steels base material

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%.

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%.

On Mon, Feb 10, 2014 at 8:28 AM, prem nautiyal <prem_nautiyal26@yahoo.com> wrote:

Hi all

 

Vessel 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.

 

Regards

 

Prem Nautiyal

9769316004

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