Cast Iron Gray Iron Ductile Iron Valves

The chemical composition standard of ductile iron QT 400 mainly includes carbon, silicon, manganese, sulfur, phosphorus and other elements. Specifically, the content of carbon ranges from 3.45% to 3.64%, silicon from 2.47% to 3.00%, manganese from 0.45% to 0.57%, sulfur from 0.012% to 0.026%, and phosphorus from 0.047% to 0.060%. In addition, it may contain elements such as magnesium, which ranges from 0.029% to 0.062%, and rhenium, which ranges from 0.032% to 0.047%. These chemical components ensure that ductile iron 400 has certain mechanical properties, including yield strength, tensile strength and elongation