Hi Mostafa,
Attached are some information on the matching welding consumables for X-20.This steel originated in Germany, that's why the main knowledge base would be with mostly German engineering companies and consumable manufacturers.The documents I've attached are from Bohler Thyssen knowledgebase.
One word of caution-This steel is a dangerous steel.High C, Cr,Mo,V causes extremely high hardness(easily > 350HV or above) in the weld/HAZ. Once welding is started you don't have much option for intermittent stoppages, or delaying PWHT. Welding, PWHT should go in one continuous cycle without any disruption. There're may be exceptions for thinner wall thicknesses. You should follow the recommended guidelines for welding of this steel.
This steel comes in 2 versions, X20CrMoV121, and X20CrMoVW121 (same chemistry with additional Tungsten addition)
Feel free to drop a line , if you require further help.
Thanks
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Eng/ Mostafa Kamel Hussein
Sent: Sunday, October 10, 2010 8:19 AM
To: materials-welding@googlegroups.com
Subject: [MW:7472] X20CR MO V12 1
what is the suitable electrode SMAW for X20 CR MO V 12 1
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