S7 Tool Steel Hardness S7 tool steel is normally supplied in the annealed condition at about 187–223 HB, with many specifications allowing a maximum annealed hardness of about 230 HB. After hardening and tempering, S7 is commonly used at 54–58 HRC. For many punches, dies, forming tools, chisels, shear blades, and other shock-loaded components, 56–58 … Continue reading S7 Tool Steel Hardness: HRC Range, Annealed HB & Working Hardness