D2 Tool Steel Plate Suppliers
58 vetted U.S. suppliers · 22 states
D2 plate is the high-carbon, high-chromium tool steel for blanking dies, punches, slitters, and wear-resistant components. Below is our live count of vetted U.S. suppliers with state distribution and a one-click RFQ flow.
Geographic distribution
Where these suppliers are
Top 8 states by vetted-supplier density. 21 more across 14 additional states — listed below the chart.
Also covered
Washington (2) · Texas (2) · Missouri (2) · New Hampshire (2) · North Carolina (2) · Indiana (2) · Florida (2) · Georgia (1) · Maryland (1) · Wisconsin (1) · Utah (1) · Kentucky (1) · Tennessee (1) · Oklahoma (1)
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What D2 tool steel plate is
D2 (AISI D2) is a high-carbon (~1.5%) high-chromium (~12%) cold-work tool steel — air-hardening, dimensionally stable, with exceptional wear resistance. Plate is supplied annealed (HRB ~95-100) for machining, then customer-heat-treated to HRC 58-62 for service. ASTM A681 covers the chemistry. Common downstream: blanking and forming dies, punches, slitter knives, gauges, and wear plates. Most jobs spec annealed plate, machine to oversize, then send out for heat treatment.
What to look for in a supplier
Confirm the supplier ships annealed (the default) unless you specifically want pre-hardened plate. Ask about thickness tolerance — D2 is often stocked in standard thickness increments (0.5", 0.75", 1", 1.25", 1.5", 2") and cutting to intermediate thicknesses adds cost. Surface condition (mill, ground-and-blanchard, precision-ground) matters for downstream machining. Some stocking distributors carry only common gauges and have to mill-source thicker plate, which extends lead time 4-6 weeks. For high-precision die work, ask about plate flatness and parallelism — premium plate runs ±0.005" parallel out of the bag.
FAQ
Common questions
What's the difference between D2 and A2?
Both are air-hardening cold-work tool steels. D2 has more chromium and more carbon — better wear resistance, slightly less toughness, slightly more dimensional change in heat treatment. A2 is more shock-resistant and has tighter heat-treat distortion — used where impact loading matters. For high-volume blanking dies, D2 is more common.
What hardness does D2 reach after heat treatment?
Standard service hardness is HRC 58-62, achieved by austenitizing at 1850°F, air-quenching, then tempering at 350-500°F. Higher tempers (around 950°F) drop hardness slightly but improve toughness — useful for punches that need to absorb impact.
Why is D2 plate sold annealed?
D2 in hardened condition is very difficult to machine (you'd be grinding everything). The standard workflow is: buy annealed plate, machine to oversize, send out for heat treat, finish grind to size. Some specialty suppliers do offer pre-hardened plate at premium for shops that want to skip the heat-treat step.
What thicknesses does D2 plate come in?
Stocking distributors typically carry 0.25", 0.375", 0.5", 0.75", 1", 1.25", 1.5", 2", and 3" plate. Above 3" and below 0.25" usually run mill-order with longer lead times.
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