Forge Temperature Guide Calculator
Calculate the ideal forge temperature for different metals and operations like forging, welding, and heat treating.
Forge temperature is critical in blacksmithing. Every metal has a specific range where it becomes plastic enough to shape without cracking or burning. Working outside this range risks ruining the workpiece or creating dangerous conditions.
Forging Temperature Ranges by Metal
| Metal / Alloy | Forging Range (°F) | Forging Range (°C) | Color at Temp |
|---|---|---|---|
| Mild Steel (1018) | 1,700–2,200°F | 927–1,204°C | Bright yellow to white |
| Medium Carbon (1045) | 1,600–2,100°F | 871–1,149°C | Yellow to light yellow |
| High Carbon (1095) | 1,500–1,900°F | 816–1,038°C | Orange to yellow |
| Tool Steel (W1) | 1,500–1,950°F | 816–1,066°C | Orange to yellow |
| Wrought Iron | 1,800–2,300°F | 982–1,260°C | Yellow to white |
| Copper | 1,200–1,650°F | 649–899°C | Dark cherry to bright cherry |
| Bronze | 1,100–1,500°F | 593–816°C | Below visible color to dark red |
| Aluminum | 750–900°F | 399–482°C | No visible color change |
| Damascus (layered) | 1,800–2,300°F | 982–1,260°C | Yellow to white (welding heat) |
Key Temperatures to Know
- Black heat: ~400–500°F (204–260°C) — metal is hot but no visible glow. Do NOT hammer at this temp for high-carbon steel, as it may crack.
- Burning point: Above the forging range, grain boundaries begin to oxidize. The steel literally burns and is permanently ruined. For 1095 steel, this begins around 1,950°F (1,066°C).
- Forge welding heat: 2,100–2,350°F (1,149–1,288°C) for mild steel. The surface becomes “sweaty” or sparking.
Worked Example — Forging a 1095 High-Carbon Knife Blade
Target forging temperature: 1,700°F (927°C), which appears bright orange to yellow. Burning temperature: 1,950°F (1,066°C). Safety margin: 1,950 – 1,700 = 250°F buffer.
You should pull the steel from the forge when it glows a consistent bright orange-yellow and return it to the forge when it drops to a dull red (~1,200°F / 649°C). This gives you roughly 15–30 seconds of working time per heat on a 1/4" thick blade.
Fuel Considerations
| Fuel Type | Max Temp Achievable | Notes |
|---|---|---|
| Charcoal | ~2,400°F (1,316°C) | Traditional, clean, easy forge welding |
| Bituminous Coal | ~2,800°F (1,538°C) | Hottest solid fuel, needs good airflow |
| Propane (1 burner) | ~2,100°F (1,149°C) | Convenient, may struggle with forge welding |
| Propane (2 burner) | ~2,400°F (1,316°C) | Can forge weld with proper insulation |