[MW:19591] RE: 19588] A890 duplex steel casting crack repair.

Dear Sir,

 

Before executing any repairs in Duplex Stainless Steels it’s important to know the reason for presence of these cracks. Is this only caused by residual stress arising during cooling down after casting, for example due to differences in wall thicknesses, or are there intermetallic phases present which makes the material brittle and therefore causes the cracks. Especially in case of heavy wall thicknesses the presence of such microstructural parts is likely. If intermetallic phases like Sigma are present in the micros structure the material should be solution heat treated (1050 – 1130 °C) before performing any repair welding activities because there is a high risk that new cracks will arise afterwards when this such intermetallic phases are present.

 

Regarding filler metal ER2593, if this is a Duplex Stainless Steel similar to the base material than it should be OK. A repair procedure should be qualified on which also applicable corrosion tests are executed in order to ensure required corrosion resistance ( and acceptable microstructure without intermetallic phases) after repair.

 

Met vriendelijke groeten / Best Regards,

 

Herman Pieper

QA-QC Inspector / IWI-C Welding Inspector / IWT / Materials Expert

 

Job van der Havestraat 6

8384 DB, Wilhelminaoord

Cell: +31 6 51691215

 

Van: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] Namens Abhimanyu Rathore
Verzonden: zaterdag 14 december 2013 05:21
Aan: materials-welding@googlegroups.com
Onderwerp: [MW:19588] A890 duplex steel casting crack repair.

 

Dear sir,

Can any one provide WPS for crack repair in A890 duplex steel casting.

IS Filler ER 2593 is OK for doing welding.

Thanks in advance.

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