1. Upstream processes
2. Transportation
3. Manufacturing
4. Results

Step 1 — Upstream processes

Describe the steel alloy used in the technology: its composition, the primary steelmaking route, and any transformation steps applied before manufacturing. This is the starting point of the life-cycle model.

Steel alloy composition
%
Alloying elements total: 0% — Fe (balance): 100%
Add each alloying element and its share of the alloy mass in percent. Iron (Fe) is the balance and is computed automatically; the alloying total must not exceed 100%.
Low-alloyed: < 5% alloying elements; Medium: 5–10%; High: > 10%. The selection must be consistent with the composition above.
EAF (Electric Arc Furnace) typically reflects recycled steel routes; BOF (Basic Oxygen Furnace) reflects primary steel from iron ore. High-alloyed steel must use EAF — the BOF route is not supported for it.
High-alloyed steel cannot be produced via BOF. This combination is not supported and yields no result — select EAF for high-alloyed steel, or choose a lower grade.
Additional steel working processes
Add only processes that are physically applied before manufacturing (e.g. sheet rolling for tank manufacturing). They are applied to the full alloy mass automatically; avoid adding the same transformation twice.