Tool Steel S7

Tool Steel S7 in CNC Machining

Tool Steel S7, known for its shock-resistant properties. It has high impact strength, wear resistance, and toughness.

Tool Steel S7 is primarily composed of iron, constituting 93.85% of its content. The alloy also contains carbon in the range of 0.45% to 0.55%, manganese ranging from 0.20% to 0.80%, and silicon in the range of 0.20% to 1.00%. Additionally, it includes chromium at a concentration of 3.00% to 3.50%, molybdenum ranging from 1.30% to 1.80%, and vanadium in the range of 0.20% to 0.30%. The remaining elements present in smaller amounts include copper at 0.25%, phosphorus at 0.03%, and sulfur at 0.03%.

Tool Steel S7 has good machinability but can be more challenging than some other tool steels due to its high hardness, so we use proper cutting tools and techniques. Before machining, the material may be annealed to reduce hardness and improve machinability. S7 is often heat-treated for high hardness and wear resistance. We use quenching and tempering processes to achieve the desired properties. S7 can be ground or polished for a smooth surface finish after machining. We always inspect the finished parts for dimensional accuracy and quality.

What is Tool Steel S7?

Tool Steel S7 is a type of air-hardening tool steel with high impact toughness and wear resistance. It belongs to the S series of shock-resistant tool steels, and S7 is specifically designed to provide a combination of strength and toughness which is best for various tool and die applications. The “S” in S7 stands for shock, indicating its ability to withstand high impact forces.

S7 tool steel is versatile, working well in both cold and hot applications. It’s also appropriate for hot work tools, especially when temperatures are below 1000°F (538°C). In plastic injection molds, S7 is offered as a high-quality product produced through remelting, reducing nonmetallic inclusions, and improving polishability for essential tooling surfaces like cavities and inserts.