[MW:12189] RE: 12187] furnace heat treatment for piping spool

Dear vijay,

 

Normally I would say when you WPS is qualified for the particular material (group) including PWHT it should not make a difference if weld connections only or full structure is heat treated.

 

Which temperature should be the maximum depends on the kind of material and temperature of heat treatments executed during steel production.

When steel is normalized it shouldn’t be a problem at all, for CS this will be anywhere around 900 - 920 °C and range for PWHT on CS will be 560 – 700 °C.

Only when material is tempered you should aware and choose a temperature about 25 °C lower than the last tempering temperature.

 

IF you keep this in mind than your mechanical properties won’t change that much, but again this is only allowed when there is a WPS available which is qualified including PWHT in the same range as applied to the pipe spools.

 

Met vriendelijke groeten / Best Regards

 

Herman Pieper

 

Pieper Quality Support & Inspection

Phone: +31 (0)521 380083

Fax:     +31 (0)84 7539225

Cell:     +31 (0)6 51691215

www.pieper-qsi.nl

 

Van: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] Namens vijay kumar
Verzonden: donderdag 11 augustus 2011 10:16
Aan: materials-welding@googlegroups.com
Onderwerp: [MW:12187] furnace heat treatment for piping spool

 

Dear all,

 

 

prefabricated cs piping spools pwht carrying by furnace method, instead to do joint total spool they doing.

 

there is any technical problems on that,  example : base metal may manufactured by normalizing method or other different method with high  temperatures 

so there is a chance to loss mechanical properties 

 

pls clarify with any supporting doc.

 

 

thank you,

vijay

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