High temperature bolting material, expansion coefficient comparable to Austenitic Stainless Steels.
| Carbon(C) | Manganes(Mn) | Phosphorus(P) | Sulfur(S) | Silicon(Si) | Nickel(Ni) | Cobalt(Co) |
| 0.08 Max | 2.0 Max | 0.040 Max | 0.030 Max | 1.0 Max | 24.0-27.0 | – |
| Chromium(Cr) | Manganese(Mo) | Niobium + Tantalum(Nb (Cb) + Ta) | Titanium(Ti) | Copper(Cu) | Aluminum(Al) | Iron (Fe) & Others |
| 13.5-16.0 | 1.0-1.5 | – | 1.9-2.35 | – | 0.35 | Fe– Balance, V– 0.10-0.50, B– 0.001-0.010 |