Chemical Composition &
Steel Processing

The chemical composition of NUCu 70W (ASTM A710 Grade B) steel is given in Table 1. After hot rolling it has a fine-grained ferritic microstructure.

NUCu 70W (ASTM A710 Grade B) steel is produced by ingot or continuous casting. It is hot rolled at temperatures that do not exceed1120^oC (2050^oF) followed by air-cooling. If the hot-rolling temperature exceeds 1120^oC (2050^oF), the Charpy impact fracture energies may be reduced. Normalizing of the hot rolled steel by reheating to 930-1050^oC (1705-1920^oF) followed by air-cooling restores the reduced Charpy absorbed impact fracture energies. If needed, the strength of A710 Grade B can be further increased by aging at 500-550^oC (930-1020^oF) after air cooling from hot-rolling.

Although NUCu 70W (ASTM A710 Grade B) steel has been produced to date in plates up to 2 inches thick, there are no technical limitations to production of thicker plates.

The mechanical and fracture properties of NUCu 70W (ASTM A710 Grade B) can be viewed in Table 2.