Slag pot RFQs arrive specifying everything from plain ZG230-450 to exotic alloy grades. In most services, simpler is better — here is the reasoning.
ZG230-450 (≈ ASTM A27 65-35)
The default choice worldwide. Moderate strength with high ductility and excellent thermal-fatigue tolerance — the steel deforms slightly rather than cracking. With LF refining and proper normalizing, this grade delivers outstanding cost-per-cycle in BOF and EAF slag service.
GS-20Mn5 (DIN/EN)
The standard European specification, broadly comparable in service to ZG230-450 with slightly higher strength and tighter chemistry control. Specify it when your engineering standard or insurer requires an EN grade; we pour both routinely.
When alloy grades earn their cost
Alloyed pots (Cr-Mo additions) resist deformation at very high rim temperatures and suit carriers with tight dimensional clearance. The trade-off: higher cost and somewhat lower thermal-fatigue ductility. Unless your operation runs unusually hot slag or extreme cycle rates, refined carbon steel typically wins on total cost.
The non-negotiables
Whatever the grade: LF refining, solidification simulation, normalize + temper heat treatment, and 100% UT of trunnion zones. Grade selection matters less than execution quality.