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Re: [MW:36031] P Number of X12CrMoWVNbN-10-1-1

By Materials & Welding
Dear friends,
below said material  is belongs to forging material.  

X12CrMoWVNbN-10-1-1   (EN No. 1.4906), this is not P91/F91 type steel. 
This is F92/P92 type forging or pipe material is under P no of 15E as per ASME sec VIII Div 1  
 

Regards,
Sankaran.SP
Welding & Metallurgy expert
Coimbatore, India. 


On Friday, April 17, 2026 at 08:49:21 AM GMT+5:30, sridhar cn <sridharcn305@gmail.com> wrote:


X12CrMoWVNbN-10-1-1   (EN No. 1.4906) is a high-alloy martensitic creep-resistant steel used in turbines and 

high-temperature service. It is not listed in ASME Sec IX QW/QB-422; hence it is treated as an unassigned material. 

Based on composition (10% Cr-Mo-W-V-Nb), it is metallurgically comparable to P91/P92 steels and aligns closest 

with P-No. 5C. Under ISO15608 grouping this material falls under Group 10/Cr-Mo-V creep resistance steels.

Sridhar.


On Thu, 16 Apr 2026 at 14:51, Ranendra Chakraborty <ranendrac6@gmail.com> wrote:
Dear Expert,

Can you give some information about P number of X12CrMoWVNbN-10-1-1 with reference?

Thanks in advance.

Ranendra Chakraborty 

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