Every slag pot we ship passes through twelve controlled stages. Here is what actually happens at each one, and why it matters to the pot's life in your slag yard.
1–3: Engineering and molding
The customer drawing is converted to a casting process design and verified by solidification simulation — risers and chills are positioned so shrinkage ends up in the risers, not the trunnion zone. The pattern shop builds the wooden pattern, and molds are produced in sodium-silicate sand in one of our eight molding pits.
4–6: Melting and pouring
Scrap is melted in electric arc furnaces (25–80T, combined for large pours), then transferred to the 120T LF ladle furnace for degassing and desulfurization. The OBLF spectrometer verifies chemistry against the grade specification before the heat is released. Pouring is done at controlled temperature with filtered gating.
7–9: Cleaning, heat treatment, finishing
After shakeout, the casting is shot-blasted on our 150/300T rotary table, risers are removed, and the pot is normalized and tempered in a computer-controlled gas furnace — the step that sets its final toughness. Surfaces are then ground and dressed.
10–12: Machining, inspection, shipment
Trunnion journals and the rim are machined on CNC vertical lathes. The finished pot receives 100% UT on critical sections plus MT on the trunnion fillets, all documented against the heat number in an EN 10204 3.1 package. Finally it is mounted on a custom steel skid, protected and loaded — flat rack or break-bulk.