Material: ASTM A757 Grade B3N B3Q 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 Grade B3N B3Q Ferritic and Martensitic Steel Castings for Pressure-Containing and Low- Temperature Service Application: Intended for Valve, Pump, General Engineering, Automotive and Other Industries Standard: AS-AUSTRALIA