However, note that is changing the landscape. Malleable iron production is energy-intensive (long annealing cycles). Some engineers are moving towards high-ductility ductile iron (ISO 1083, Grade 450-18) to avoid heat treatment costs. Nevertheless, for complex thin-wall geometries, no alternative has fully replaced the specific advantages defined in ISO 5922 .
For optimized impact resistance, it is recommended that phosphorus levels do not exceed 0.10%. iso 5922 pdf