Heritage Galvanised steel Z600 is hot-dipped zinc-coated steel with a spangled surface that complies with AS/NZS 1397. Minimum yield strength is G550 (550 MPa) or G300 (300 MPa), depending on the product. Minimum coating mass is Z600 (600g/m2). The base metal thickness is 0.42mm or 0.60mm, depending on the product.