Re: [MW:20074] Effect of higher Copper content on Austenitic Stainless Steels base material

at general Copper has a good effect on the Austenitic stainless steel ( ASS) where CU is an austenitic stabilizer elements , and assist in increasing corrosion resistance of ASS family.

>>>>> benefits of copper in ASS >>>>>>>>>>>

(a) copper stabilizes austenite , making it possible to reduce the nickel content in the alloy.

(b) copper is a good stabilizer against martensitic transformation , giving rise to more stable austenite.

(c) Copper increases general corrosion resistance and helps to improve steel corrosion resistance in sulphuric acid.

Note >>>>>>>>>>>>> see the high lights words in the attachment .

On Mon, Feb 10, 2014 at 6:28 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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