Material: ASTM A757 Grade D1N3 D1Q3 Description: Standard Specification for Steel Castings, Ferritic and Martensitic, for Pressure‐Containing and Other Applications, for Low‐Temperature Service Group Name: Ferrous Mild Steel Alloys Sub Group: ASTM A757 / A757M Steel Castings, Ferritic and Martensitic, for Pressure‐Containing and Other Applications, for Low‐Temperature Service Application: Intended for Valve, Pump, General Engineering, Automotive and Other Industries Grade Standard: AS-AUSTRALIA