ZG230-450 Refining Kettle EB4023 Detailed Description: Material Grade: Alloy Steel; Quality Level: As per National Standard & International Standards. Production Process: Sand Process Including machining process,such as drilling and tapping holes. Special Features: 1. We can make big size Alloy steel castings with Sodium Silicate Sand Process. 2. We can supply finished Alloy steel castings with heat-treatment and machining process. 3. We can produce Alloy Steel castings as per GB/T 20878,DIN 17440,DIN 17224, AISI,ASTM,JIS SUH35,NF A35-572/584,BS970,BS1449,ISO 683/13. 4. The biggest steel castings we can achieve so far is 50 tons per piece.