It can be achieved through better welding practice. Interpass and preheating must be maintained as per WPS and heating should be done by electric method for uniform heating of material. Don't allow the material temperature get down before completion of welding and post heating. This is very stringent material to weld. But if the welding and PWHT is done religiously as per procedure, you will get very good results even you can achieved hardness less than 250 BHN.
Sent on my BlackBerry® from Vodafone
From: Shomenath Bagchi <snbagchi@ymail.com>
Sender: materials-welding@googlegroups.com
Date: Sun, 6 Jan 2013 01:39:25 -0800 (PST)
To: materials-welding@googlegroups.com<materials-welding@googlegroups.com>
ReplyTo: materials-welding@googlegroups.com
Subject: Re: [MW:16447] RE: 16411] HardnessP-91 Material
Hardness comes down appreciably after PWHT, and this is required. Teat treatment (PWHT) is mostly done as a mandatory procedure in P91steel. Check your client requirements for hardness after PWHT
From: Ryan Carbonara <rcarbonara@valv.com>
To: materials-welding@googlegroups.com
Sent: Thursday, January 3, 2013 8:51 AM
Subject: [MW:16412] RE: 16411] HardnessP-91 Material
--Client call typically. You wont find it in B31.1
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Anthony Rudder
Sent: Wednesday, January 02, 2013 11:37 AM
To: materials-welding@googlegroups.com
Subject: [MW:16411] HardnessP-91 MaterialSir,What's the Max hardness for weld metal and HAZ for P-91 Material per B31.1Thank You,TonyQA.Manager.
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