Stainless steel is shaped by hot forging between 1,100 and 1,250 °C or by casting at about 1,550-1,600 °C, and the choice follows the shape: forge simple bars, plates and blades, cast complex valve bodies and fittings. Forging needs only a strong forge and more hammer work than carbon steel, while casting needs a furnace that melts steel, which most villages do not have.
Part of Stainless Steel Production
How finished stainless shapes are made: choosing between forging, casting and welding, and what each demands of the workshop.
Shape Decides The Process
The carrier sets out three ways to form stainless: forging, investment casting and welding. They suit different parts.
| Process | Suits | Needs | Main limit |
|---|---|---|---|
| Hot forging | Bars, plates, blades, simple hardware | A strong forge reaching 1,100-1,250 °C | Tougher than carbon steel, so more blows; never forge below 900 °C |
| Investment casting | Valve bodies, pump housings, fittings | A furnace melting steel; a ceramic shell | Pour at 1,550-1,600 °C |
| Welding | Joining pieces into vessels | Arc supply, or forge and flux | Heat-affected zone loses corrosion resistance |
Forging comes first for a village: the corpus forge in Metalworking reaches 1,200-1,400 °C with charcoal, which covers the carrier’s forging range, while melting steel for casting needs the arc furnace of EAF Operation for Stainless or a very well blown crucible.
What You Need
- A forge and fuel (Forge Setup, Forge Fuel).
- Clean tools, preferably dedicated to stainless, because iron pickup on the surface seeds rust.
- For casting: a furnace, crucible and mould that hold the pour temperature.
- Heat treatment capacity for after-forming steps: Solution Annealing and Passivation Treatment.
Common Mistakes
- Using carbon-steel habits. Stainless is tougher; lighter blows at too low a heat crack it.
- Casting before forging has been mastered. A casting needs a melted-steel furnace; a forged part does not.
- Skipping the finishing steps. Forging scale and tool iron must be removed (Passivation Treatment).
Safety
Hot metal and molten metal
Forging at 1,100-1,250 °C and pouring at 1,550-1,600 °C both burn through skin and leather. Water or damp in a mould or ladle throws molten metal; dry and preheat moulds, stand clear of the pour, and keep a bucket of dry sand, not water, near the work.
What’s Next
- Learn next: Hot Forging - the first process to master
- Combine with: Achievable Grades - the grade affects the forging and cooling cycle