Steel D2 Nitrided
Finish state
AISI/SAE D2 · UNS T30402 · EN 1.2379, X153CrMoV12 · JIS SKD11 · GB Cr12Mo1V1, Cr12MoV
Surface case ~1100–1300 HV for galling and adhesive-wear resistance on cold-forming and extrusion tooling.
Values for the Nitrided condition
Other D2 tempers and conditions
D2 is listed in 8 conditions; see the grade overview at D2.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefault soft annealed / spheroidized supply condition | Standard mill supply for bar, plate and ground flat stock; machine to shape in this state, then harden. | 450 | 750 | 15 | 220 HB | — |
rough-machined then 600–700 °C stress relief before hardening | Pick for large or asymmetric dies to minimise distortion during the later hardening cycle. | 460 | 760 | 14 | 20 HRC | 2.7 % IACS |
High-temper (≈540–560 °C) toughness-biased condition | Choose for shock-loaded or thick-section tooling where chipping, not wear, is the failure mode. | 1,550 | 1,800 | 2 | 55 HRC | 2.5 % IACS |
austenitize 1000–1030 °C, air/vacuum quench, temper (generic) | Generic finished tooling condition, typically 58–62 HRC for cold-work punches, dies and blades. | 1,700 | 2,000 | 1 | 60 HRC | — |
Secondary-hardened | Balanced wear/toughness setting used for most blanking dies and shear blades, and the base for nitriding or PVD. | 1,700 | 1,950 | 1 | 59 HRC | 2.5 % IACS |
Low temper (180–220 °C) maximum-hardness condition | Highest wear resistance for thin-gauge blanking, slitters and cold-forming inserts; least chip-tolerant. | 1,800 | 2,100 | 0.8 | 61 HRC | 2.4 % IACS |
Deep cryogenic treated (−80 to −196 °C) plus temper | Adds ~1–2 HRC and stabilises retained austenite; specify for gauge-critical dies and long-run wear parts. | 1,850 | 2,100 | 0.7 | 62 HRC | 2.5 % IACS |
NitridedThis page hardened & tempered core with plasma/gas nitrided case | Surface case ~1100–1300 HV for galling and adhesive-wear resistance on cold-forming and extrusion tooling. | 1,850 | 2,050 | 1 | 59 HRC | 2.6 % IACS |
What is D2 Nitrided?
D2 Nitrided is D2 supplied in the Nitrided condition — surface case ~1100–1300 HV for galling and adhesive-wear resistance on cold-forming and extrusion tooling. D2 Nitrided has a yield strength of 1,850 MPa (268 ksi) and a tensile strength of 2,050 MPa (297 ksi) — stronger than 99% of steel grades. Elongation at break is 1% and the elastic modulus is 210 GPa (30.5 Msi). D2 Nitrided has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 95% of steel grades. It melts at 1,421°C (2,590 °F). Annealed is the default condition FabDigit quotes; Nitrided is available on request or by drawing note.
Advantages
- High strength — 1,850 MPa (268 ksi), better than 99% of steel grades
- Good corrosion resistance — 35/100, better than 97% of steel grades
- High service temperature — 450°C (842 °F), better than 86% of steel grades
- Polishes to a fine finish — 65/100, better than 78% of steel grades
Limitations
- Difficult to machine — 4/100, worse than 100% of steel grades
- Difficult to weld — 3/100, worse than 100% of steel grades
- Limited formability — 2/100, worse than 100% of steel grades
- Limited ductility — 1%, worse than 99% of steel grades
- Low electrical conductivity — 2.6 % IACS, worse than 97% of steel grades
D2 Nitrided properties
Typical room-temperature values for D2 Nitrided; 21 are specific to this condition. Other listed values are D2 reference data and may not represent this condition. Bars are the position among steel grades.
Physical2
D2 Nitrided has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 95% of steel grades. It melts at 1,421°C (2,590 °F).
Mechanical15
D2 Nitrided has a yield strength of 1,850 MPa (268 ksi) and a tensile strength of 2,050 MPa (297 ksi) — stronger than 99% of steel grades. Elongation at break is 1% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
D2 Nitrided is rated for continuous service to 450°C (842 °F). It conducts heat at 20 W/m·K (11.6 BTU/hr·ft·°F), worse than 96% of steel grades. Thermal expansion is 10.5 µm/m·K (5.83 µin/in·°F).
Electrical3
D2 Nitrided conducts electricity at 2.6 % IACS, worse than 97% of steel grades.
Chemical & Environmental3
Corrosion resistance is fair (35/100), better than 97% of steel grades.
Sustainability4
Producing a kilogram of D2 Nitrided takes about 36 MJ of energy and emits 3 kg of CO₂ — more than 89% of steel grades. Typical recycled content is 45%.
Manufacturability8
D2 Nitrided's machinability is not recommended (4/100, worse than 100% of steel grades); weldability not recommended (3/100); formability not recommended (2/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with D2 Nitrided
Is D2 easy to machine?
Machine only in the annealed state with rigid setups, sharp carbide or coated carbide at modest speeds; after hardening it is a grind/EDM-only material (leave 0.2–0.4 mm grind stock).
Can D2 be welded?
Poor weldability — repair welding only, with 300–450 °C preheat, matching Cr-Mo-V or tool-steel filler, and immediate temper below the last tempering temperature to avoid quench cracks.
Can D2 be formed, bent or molded?
Not a cold-formable steel; hot forge 1050–900 °C with slow cooling and mandatory soft anneal, and design dies with generous radii since the hardened part has almost no ductility.
What surface finishes work on D2?
Grind, lap and polish to a fine finish, then protect by nitriding, black oxide, hard chrome or PVD (TiN/CrN/TiAlN) below the tempering temperature; the 12% Cr does not make it stainless, so oil bare surfaces in storage.
D2 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| CASTM A681 / GB Cr12MoV runs 1.45–1.70 in some Chinese grades | 1.4 – 1.6 | 1.5 |
| Cr | 11 – 13 | 12 |
| Mo | 0.7 – 1.2 | 0.9 |
| V | 0.5 – 1.1 | 0.9 |
| Mn | ≤ 0.6 | 0.35 |
| Si | ≤ 0.6 | 0.3 |
| Niresidual | ≤ 0.3 | — |
| Curesidual | ≤ 0.25 | — |
| P | ≤ 0.03 | — |
| S | ≤ 0.03 | — |
| Fe | balance | — |
D2 Nitrided — frequently asked
What is D2 Nitrided used for?
D2 Nitrided is typically used for blanking and piercing dies, shear and slitter blades, thread rolling dies, cold heading and coining dies, forming and trim dies and forming rolls. In short: high-carbon; high-chrome wear.
What is the yield strength of D2 Nitrided?
D2 Nitrided has a typical yield strength of 1,850 MPa (268 ksi) and a tensile strength of 2,050 MPa (297 ksi) — stronger than 99% of steel grades. Strength varies by condition: see the 8 listed tempers.
Is D2 Nitrided easy to machine?
Not especially — machinability is rated not recommended (4/100, worse than 100% of steel grades). Machine only in the annealed state with rigid setups, sharp carbide or coated carbide at modest speeds; after hardening it is a grind/EDM-only material (leave 0.2–0.4 mm grind stock).
Can D2 Nitrided be welded?
Not readily — weldability is rated not recommended (3/100). Poor weldability — repair welding only, with 300–450 °C preheat, matching Cr-Mo-V or tool-steel filler, and immediate temper below the last tempering temperature to avoid quench cracks.
What surface finishes work on D2 Nitrided?
Grind, lap and polish to a fine finish, then protect by nitriding, black oxide, hard chrome or PVD (TiN/CrN/TiAlN) below the tempering temperature; the 12% Cr does not make it stainless, so oil bare surfaces in storage.
Can D2 Nitrided be formed, bent or molded?
Not a cold-formable steel; hot forge 1050–900 °C with slow cooling and mandatory soft anneal, and design dies with generous radii since the hardened part has almost no ductility.
What is the maximum service temperature of D2 Nitrided?
D2 Nitrided is rated for continuous use to about 450°C (842 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between D2 Annealed and D2 Cryo?
Annealed is the default condition — standard mill supply for bar, plate and ground flat stock; machine to shape in this state, then harden. Cryo: adds ~1–2 HRC and stabilises retained austenite; specify for gauge-critical dies and long-run wear parts. Yield strength is 450 MPa in Annealed versus 1,850 MPa in Cryo.
Can FabDigit make parts in D2 Nitrided?
Yes — D2 Nitrided is available for CNC machining with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- ASTM A681 Standard Specification for Tool Steels Alloy — ASTM International (2022)
- GB/T 1299 (Cr12MoV / Cr12Mo1V1) — SAC (2014)
- EN ISO 4957 Tool steels (X153CrMoV12, 1.2379) — CEN/ISO (2018)
- JIS G4404 Alloy tool steels (SKD11) — JSA (2015)
- ASM Handbook Vol.1: Properties and Selection — Tool Materials — ASM International (1990)
- Uddeholm Sverker 21 / Böhler K110 cold-work tool steel datasheets — voestalpine (2023)
- SMM / 1688 (Cr12MoV, SKD11) — SMM / 1688 (2026)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.