15-5 PH VM stainless steel is a martensitic precipitation-hardening stainless steel with approximately 15% Chromium and 5% Nickel, hence the name 15-5. Vacuum Consumable Electrode Remelting (VM) is the melt process used for Type 1. The VM material is a cleaner product offering lower percentages of ferrite. 15-5 has high strength, high hardness, and excellent corrosion resistance. 15-5 materials forgeability is superior to 17-4. Strength can be further increased by a single low temperature heat treatment. (UNS:S15500)
Element | Min | Max |
---|---|---|
Carbon, C | – | 0.07 |
Manganese, Mn | – | 1 |
Silicon, Si | – | 1 |
Sulfur, S | – | 0.015 |
Phosphorus, P | – | 0.03 |
Chromium, Cr | 14 | 15.5 |
Molybdenum, Mo | - | 0.5 |
Nickel, Ni | 3.5 | 5.5 |
Columbium (Niobium), Nb | 5xC | 0.45 |
Copper, Cu | 2.5 | 4.5 |