X100CrMoV5
1.2363Air-hardening medium-alloy cold work tool steel, known as AISI A2. 5% Cr provides good through-hardening and excellent dimensional stability during heat treatment — minimal distortion compared to oil-hardening grades. Hardened to 57–62 HRC. Good combination of wear resistance and toughness — tougher than D2 (1.2379) at similar hardness. Used for blanking dies, trimming dies, forming tools, gauges, shear blades, coining tools and precision components requiring minimal distortion.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | A2 | T30102 | REF |
| 🇯🇵 | JIS | Japan | SKD12 | — | 90% |
Sources: ASTM A681, JIS G4404
Chemical composition comparison (wt%)
Side-by-side: X100CrMoV5 (EN) (EN ISO 4957) vs SKD12 (JIS)
| Element | X100CrMoV5 (EN) | SKD12 (JIS) | Overlap |
|---|---|---|---|
| C | 0.95–1.05% | — | — |
| Si | 0.1–0.4% | — | — |
| Mn | 0.4–0.8% | — | — |
| P | ≤ 0.03% | — | — |
| S | ≤ 0.02% | — | — |
| Cr | 4.75–5.5% | — | — |
| Mo | 0.9–1.4% | — | — |
| V | 0.15–0.35% | — | — |
Mechanical properties
Annealed
| Property | Value | Unit |
|---|---|---|
| Hardness HB | ≤ 230 | HB |
Hardened + Tempered 200°C
| Property | Value | Unit |
|---|---|---|
| Hardness HRC | 59–62 | HRC |
Hardened + Tempered 500°C
| Property | Value | Unit |
|---|---|---|
| Hardness HRC | 57–59 | HRC |
General
| Property | Value | Unit |
|---|---|---|
| Density | 7.86 | g/cm³ |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| Soft annealing | 800–840 °C | Furnace cooling | — | Cool 20°C/h, max 230 HB |
| Hardening | 940–970 °C | Air | — | Air cool — minimal distortion |
| Tempering | 180–540 °C | Air | — | Double temper: 200°C→61 HRC, 520°C→58 HRC |
Compatibility verdict
X100CrMoV5 and SKD12: 90% composition match
Close equivalents but NOT identical.
Related materials
P20 / 40CrMnMo7
1.2311Pre-hardened plastic mold steel (usually delivered at 28-34 HRC). The most widely used mold base steel globally. Good machinability in pre-hardened condition, good polishability. Used for injection molds, die-casting dies, extrusion tooling, and structural mold components.
M2 / HS6-5-2
1.3343The most widely used high-speed steel worldwide. W-Mo-Cr-V composition gives excellent red hardness (cuts at temperatures up to 600°C). Used for twist drills, end mills, taps, reamers, bandsaw blades, and general-purpose cutting tools. The benchmark HSS grade.
X45NiCrMo4
1.2767Nickel cold-work tool steel with exceptional toughness from ~4% Ni content. Excellent through-hardenability, polishability, and impact resistance. Used for plastic injection molds (high-gloss), embossing dies, scrap shear blades, punches, cutlery dies, and bending tools.
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