Re: [MW:20099] Effect of higher Copper content on Austenitic Stainless Steels base material

In supercritical power plant 304H Cu is being used

THANKS & BEST REGARDS

KG.PANDITHAN, AWS-CWI, CSWIP 3.1

CONSULTANT-WELDING & QUALITY

On Thu, Feb 13, 2014 at 10:38 PM, Charley Sui <charleysui@gmail.com> wrote:

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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