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Tool Steel S7
Material Type
Metal
Material Name
Tool Steel S7
Alternative Names
1.2355 | 50CrMoV13-15 | T41907
Process Compatibility
CNC Milling, CNC Turning
introduction
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.
Properties
Properties Table of Tool Steel S7
| MECHANICAL PROPERTIES | |
|---|---|
| Ultimate Tensile Strength | 640-670 MPa |
| Yield Strength | 370-380 MPa |
| Young's Modulus(Elasticity) | 190 GPa |
| Elongation at Break | 21-25% |
| Physical Properties | |
| Magnetism | Magnetic |
| Weldability | Poor |
| Thermal Properties | |
| Maximum Service Temperature | 165-215°C |
| Thermal Expansion Coefficient | 10.7-11.2 x 10^-6/°C |
| Thermal Conductivity | 42.3-45.7 W/(m·°C) |
| Electrical Properties | |
| Electrical Resistivity | 24.5-30.2 μΩ*cm |
TECHNOLOGY OVERVIEW
Basic Knowledge of Tool Steel S7
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.
Advantages of Tool Steel S7
Excellent Shock Resistance
High Toughness
Good Wear Resistance
High Hardenability
Versatility in Heat Treatment
Machinability
Good Red Hardness
Reasonable Corrosion Resistance
Applications of Tool Steel S7
Cold work tooling (punches, dies, shear blades)
Forming and stamping dies
Injection molding molds and dies
Metal extrusion tooling
Chisels and woodworking tools
Blanking and piercing tools
Metalworking rolls
Impact-resistant components (hammers, chisels, impact tools)
FAQ
Machining Tool Steel S7 Buying FAQ
S7 is a shock-resistant tool steel that belongs to the air-hardening, high-carbon, and high-chromium group. It falls under the ASTM A681 standard classification.
S2 is a high-carbon, high-chromium steel with excellent wear resistance, while S7 is an air-hardening shock-resistant tool steel known for its toughness and impact resistance.
S7 is an air-hardening tool steel known for its shock resistance, while 4140 is a low-alloy steel with good strength and toughness.
S7 is typically air-hardened by heating it in a controlled atmosphere. Flame hardening, which involves localized heating using an oxy-acetylene flame, is not the common method for hardening S7. Air hardening is the preferred method to achieve the desired hardness and properties in S7 tool steel.
Yes, S7 is an oil-hardening tool steel. The term "air-hardening" in the context of S7 steel refers to the fact that it can be hardened by exposure to air rather than quenching in water or oil. However, while S7 can be air-hardened, it is often recommended to use oil quenching for optimal results.
Other Materials
Tool Steel D2
Tool steel D2 is a high-carbon, high-chromium, air-hardening steel with excellent wear resistance, high compressive strength, and good toughness.
More info about Tool Steel D2
Tool Steel A3
Tool Steel A3, also known as AISI A3 or W1-A-1, is a high-carbon, high-alloy steel with excellent wear resistance and toughness.
More info about Tool Steel A3
Tool Steel A2
Tool steel A2 is an air-hardening, cold-work tool steel commonly used in CNC machining due to its excellent wear resistance and toughness.
More info about Tool Steel A2
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