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CNC Machining
Tool Steel S7 is a shock-resisting, air-hardening tool steel with exceptional impact properties and the highest hardenability of its class. Through our UK CNC machining service, Tool Steel S7 CNC parts can be produced as one-off prototypes or repeat batches.
It resists softening at elevated temperatures, giving it some hot-work capability, and hardening in air keeps heat treatment safe and stable. Typical uses include punches, dies & chuck jaws, plastic injection tooling and industrial knives & hammers. Its quoted tensile strength of around 2200 MPa gives a useful guide when sizing parts.
Parts are CNC milled or turned and can be hardened after machining for demanding tooling applications. Upload your CAD file for a quick quote on CNC machining Tool Steel S7, with delivery anywhere in the UK. Finish options (as machined or ground) can be confirmed when you order.
Material
Tool Steel S7
Description
Strengths
Lead time 10 business days. Shock-resisting tool steel with outstanding impact toughness for cold and hot work.
Weaknesses
Poor weldability
Silver grey
Ultimate tensile strength
2200 MPa
Yield strength
2050 MPa
Modulus of elasticity
215 GPa
Elongation at break
7.5%
Density
7.833 g/cm³
Hardness
30–60 HRC
Shear modulus
Not specified
Corrosion resistance
Low
UK equivalent
Maximum service temperature
165–215°C
Thermal expansion coefficient
10.7–11.2 × 10⁻⁶ /°C
Thermal conductivity
42.3–45.7 W/(m·°C)
Electrical resistivity
Not specified
Heat treatment
Hardening & tempering
Recommended finish
As machined or ground
Punches, dies & chuck jaws
Plastic injection tooling
Industrial knives & hammers
Dowel pins & gauges
Values shown are typical supplier figures for Tool Steel S7 and may vary with stock condition. Please confirm critical properties before production.
Tool Steel S7 is machined in the annealed condition, then hardened. It machines well in the annealed condition and is chosen for its outstanding impact toughness.
Heat treatment after machining can cause slight size change, so critical features may be finished by grinding after hardening. Achievable tolerances depend on part size, geometry and features, so mark any critical tolerances on a 2D drawing with your upload and they will be reviewed and confirmed in your quote.
Tool Steel S7 is normally finished by hardening and tempering. Parts can be supplied as machined or ground. Please state the hardness you need on your drawing.
Typical uses include punches, dies and chuck jaws, plastic injection tooling, industrial knives and wear parts, and dowel pins and gauges.
S7 is a shock-resisting steel that is far tougher than D2 or A2, which makes it ideal for punches, chisels and parts subject to impact. It is less wear resistant than D2.
The typical lead time shown for Tool Steel S7 is 10 business days from an approved order. Heat treatment can add time. Quantity, finishing and any heat treatment can affect this, and your quote confirms the date before you order.
Parts in as fast as 10 business days
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