13Cr (420 Mod) is a Martensitic Stainless Steel with 13% Chromium and a restricted carbon range. 420 Mod is allowed by NACE MR0175 for limited sour service with a maximum of 1.5 psi maximum H2S partial pressure. It has excellent corrosion resistance in sweet environments. vSM stocks 13Cr/420Mod bar between 2.5 – 10.0 in.
| Carbon(C) | Manganese(Mn) | Phosphorus(P) | Sulfur(S) | Silicon(Si) | Nickel(Ni) | Cobalt(Co) |
| 0.18-0.22 Max | 1.00 Max | 0.02 Max | 0.010 Max | 1.0 Max | 0.50 Max | – |
| Chromium(Cr) | Molybdenum(Mo) | Niobium + Tantalum(Nb (Cb) + Ta) | Titanium(Ti) | Copper(Cu) | Aluminum(Al) | Iron (Fe) & Others |
| 12.0-14.0 | – | – | – | 0.25 Max | – | Fe– Balance |