Tool and Die Steel S7 Bars, often referred to as AISI S7, are high-impact, air-hardening tool steels known for their excellent toughness and shock resistance. Typically, their composition includes 0.45–0.55% carbon, 3.00–3.50% chromium, 1.10–1.60% molybdenum, and 0.20–0.80% vanadium, along with manganese and silicon. S7 bars strike a unique balance between strength and ductility, boasting a tensile strength of up to 2000 MPa. This steel retains high hardness after air cooling and performs reliably in both cold and hot work applications. Its mechanical properties make it perfect for tools that need to withstand repeated impacts without cracking or deforming.
The S7 Tool and Die Steel Bars are high-carbon, high-chromium alloys made to exhibit superior toughness and wear resistance. Typical composition consists of Carbon: 0.45–0.55%, Chromium: 5.25–6.25%, Manganese: 0.60–0.90%, Silicon: 0.60–1.00%, Vanadium: 1.00–1.50%, and trace amounts of Molybdenum: 0.30–0.50%. All these elements help steel show good strength, impact resistance, and the capacity to work under elevated temperatures. S7 bars offer hardness in the 45–55 HRC range and have outstanding toughness, providing very good resistance to fatigue; as such, S7 bars can be applied as tooling or die-casting.
| ASTM A681-2008 | C | Si | Mn | P | S | Cr | V | Mo | ||||||
| S7/T41907 | 0.45 | 0.55 | 0.20 | 1.00 | 0.20 | 0.90 | 0.03 | 0.03 | 3.00 | 3.50 | – | 0.35 | 1.30 | 1.80 |
| DIN ISO 4957 | C | Si | Mn | P | S | Cr | V | Mo | ||||||
| 1.2355/50CrMoV13-15 | 0.45 | 0.55 | 0.20 | 0.80 | 0.50 | 0.90 | 0.03 | 0.02 | 3.00 | 3.50 | 0.15 | 0.35 | 1.30 | 1.70 |
| Properties | Metric |
| Hardness, Rockwell C (air cooled from 941°C, 649°C temper temperature) | 41 |
| Hardness, Rockwell C (air cooled from 941°C, 449°C temper temperature) | 53 |
| Hardness, Rockwell C (air cooled from 941°C, 149°C temper temperature) | 57 |
| Modulus of elasticity | 207 GPa |
| Charpy impact (V-notch; air cooled from 941°C; 425°C temper temperature) | 13.6 J |
| Charpy impact (V-notch; air cooled from 941°C; 649°C temper temperature) | 16.3 J |
| Charpy impact (V-notch; air cooled from 941°C; 200°C temper temperature) | 16.9 J |
| Machinability (1% carbon steel) | 70.0 – 75.0% |
| Poisson’s ratio | 0.27-0.30 |
| Country | USA | German |
| Standard | ASTM A681 | DIN EN ISO 4957 |
| Grades | S7/T41907 | 1.2355/50CrMoV13-15 |
| Properties | Conditions | ||
|---|---|---|---|
| T (°C) | Treatment | ||
| Thermal expansion | 12.6 x 10-6/ºC | 20-200 | – |
The standard annealing temperature for Tool and Die Steel S7 bars is typically around 1,600°F to 1,650°F (871°C to 899°C), followed by slow cooling to relieve internal stresses.
Yes, Tool and Die Steel S7 bars are available in custom lengths and shapes, often tailored to specific customer requirements, ensuring versatility for various tooling and die applications.
Tool and Die Steel S7 Bars are commonly utilized in applications that demand high impact resistance and toughness under stress. They are particularly suited for manufacturing chisels, punches, shear blades, riveting tools, and dies used in both cold and hot work environments. The air-hardening feature of S7 minimizes distortion during heat treatment, making it ideal for precision tools. This steel is especially valuable in the automotive, aerospace, forging, and construction industries, where tools face extreme forces. With its ability to resist softening at high temperatures and maintain strength under impact, S7 steel guarantees long-lasting, dependable tool performance in challenging conditions.
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
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