... , middle-, low-alloy steel castings, normal carbon steel castings, graphite cast iron castings, wearable/heat-resistant alloy castings and precision castings ... ,A variety of steel for steel ingots3,Large-scaled cast steel items and cast iron items (unit weight < 60 tons);4,Undertaking ... , normalizing, temper, hardening, solution heat treatment, quenching and so on. marine casting pipe