What is the Material Group of X10CrWMoVNb9-2 as per ISO 15608?

[tamal1475]

thread330-92704

There was no conclusion from the earlier thread. The composition is closest to Group 6 Sub group 6.4. But there is no indication of Tungsten in the Type of Steel in Table 1. In the absence of any indication of Tungsten in the table, I presume this steel will fit into Subgroup 6.4. ASME Section IX put this grade (equivalent to P92) in 15E, same as P91.

 

[denlow60]

ISO/TR 20172:2009(E): X10CrMoVNb9-1 Group 6.4 Standard(s)EN 10216-2, EN 10222-2

ISO/TR 20173:2009(E): ASTM/ASME Type or grade UNS No. ASME/AWS P or M No. Group No. ISO/TR 15608:2005[1] group Nominal composition
A/SA 234 WP91 K90901 5B 2 6.4 9Cr-1Mo-V
A/SA 335 P91 K90901 5B 2 6.4 9Cr-1Mo-V
A/SA 369 FP91 K90901 5B 2 6.4 9Cr-1Mo-V

 

[denlow60]

P92 does not appear in the ISO / EN standard

UNS Phosphorus, Sulfur,
Grade DesignationA Carbon Manganese Max. Max. Silicon Chromium Molybdenum Others
P92 K92460 0.07–0.13 0.30–0.60 0.020 0.010 0.50 max. 8.50–9.50 0.30–0.60
P91 K91560 0.08–0.12 0.30–0.60 0.020 0.010 0.20–0.50 8.00–9.50 0.85–1.05

 

[OSIRIS7]

According EN 13480-2:2012 issue 2 (2013-08) the material group to CR ISO 15608 for seamless pipe acc. EN 10216-2 is 6.4.