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.
On Mon, Feb 10, 2014 at 6:28 AM, prem nautiyal <prem_nautiyal26@yahoo.com> wrote:
--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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