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
https://materials-welding.blogspot.com/
https://www.linkedin.com/groups/122787
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