B91 material

[Pravin Poornachandran]

Dear expert, 

I have B91 material to be weld, 6mm and 10mm thickness, however project requirement need to test -20degC impact which I don’t really agree due to Cr-Mo is not intended for low temperature application. 

I performed PWHT 770degC x 1hr but unable to achieve desired charpy, I was wondering if I extend holding time for 6hr, is it possible to achieve -20degC? (Average 40J). 

Welding Process: SMAW and GTAW 

Could anyone advise and guide how to achieve desired impact ? 

Best regards,

Pravin 

[Jamie Reyes]

Honestly, to many variables involved. To the welding process used, to the weldor's technique, just to many variables to give you an educated answer. One would be guessing. Maybe you can post the WPS used? Sorry I couldn't be more helpful. More information is needed.....

Regards,

Jamie Reyes

J.R. Machine Company, Inc.

--
https://materials-welding.blogspot.com/
https://www.linkedin.com/groups/122787
---
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-weld...@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/CADDyn7e%2B2Vea_Vc61p4Gnfm4Yp%3DU3SasP_R-%3D5%2BT9w192rf5iw%40mail.gmail.com.

[Vishwas Keskar]

FOR Gr 91- ER90S- B9, ER9015-B91  consumables ,  minus 20 Deg C = 40 J can not be achieved due to Cr  Mo Nb V weld metal chemistry.

  Plus 20 Deg C =  40 J   is the requirement so as to have good toughness to weld metal.

This is the requirement that is specified by most of the Customer Specifications.

 

Minus 20  Deg C just can not be met.

To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/CAJNUtUPYu0ExYnc4Lou_kP2NtFTyOPE99ESZinQBJfu3WSVyvQ%40mail.gmail.com.