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CNC Machining
Tool Steel D2 is a high-carbon, high-chromium, air-hardening tool steel. Its large chromium-rich carbides give it outstanding resistance to wear from sliding and abrasive contact. For UK engineers and product designers, CNC machining Tool Steel D2 is a reliable route from prototype to finished part.
It offers a well-balanced mix of wear resistance, toughness and cost, which makes it a go-to grade for long-running tools and dies. Common examples are punches & blanking dies, forming & trimming dies and shear & industrial knives. Its quoted tensile strength of around 2500 MPa gives a useful guide when sizing parts.
D2 is machined in the annealed state by CNC milling or turning and can then be hardened. It offers mild corrosion resistance once hardened. Get an instant online quote for Tool Steel D2 CNC parts and have them delivered to your door in the UK.
Material
Tool Steel D2
Description
Strengths
Lead time 10 business days. Very hard, highly wear-resistant air-hardening tool steel; machinable when annealed.
Weaknesses
Poor weldability; brittle if overloaded
Silver grey
Ultimate tensile strength
2500 MPa
Yield strength
2290 MPa
Modulus of elasticity
215 GPa
Elongation at break
15.2%
Density
7.695 g/cm³
Hardness
250 HB
Shear modulus
Not specified
Corrosion resistance
Mild (hardened)
UK equivalent
Maximum service temperature
195–245°C
Thermal expansion coefficient
10.3–12 × 10⁻⁶ /°C
Thermal conductivity
29.3–31.7 W/(m·°C)
Electrical resistivity
Not specified
Heat treatment
Air hardening
Recommended finish
As machined or ground
Punches & blanking dies
Forming & trimming dies
Shear & industrial knives
Thread-rolling dies & gauges
Values shown are typical supplier figures for Tool Steel D2 and may vary with stock condition. Please confirm critical properties before production.
Tool Steel D2 is machined in the annealed condition, then hardened. Its high chromium content makes it very wear resistant, so it is slower to machine than other tool steels.
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 D2 is normally finished by air 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.
D2 offers the highest wear resistance of the common cold-work grades, but it is less tough than A2 or S7 and can be brittle if overloaded. Choose A2 for a balance of toughness and wear, or S7 where shock loading is expected.
The typical lead time shown for Tool Steel D2 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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