This Black Mild Steel Flat Bar, measuring 40mm x 10mm, is made of S275JR grade mild steel. It boasts excellent formability, weldability, and machinability. However, it has poor corrosion resistance, so protective measures are necessary. With a mill finish, it offers a smooth surface. Weighing 3.14 kg per meter, it's ideal for construction and fabrication projects requiring strength and durability.