Overview
SKD11 Tool Steel is a high-carbon, high-chromium cold-work tool steel standardized under JIS G4404 and widely recognized as the Japanese equivalent of AISI D2 and DIN 1.2379. It is renowned for its outstanding combination of wear resistance, hardness, dimensional stability, compressive strength, and edge retention.
SKD11 is one of the most commonly used tool steels in precision tooling, metal stamping, mold manufacturing, and industrial cutting applications.
SKD11 is widely used in:
- Stamping Dies
- Blanking Dies
- Punches
- Cold Forming Dies
- Shear Blades
- Slitting Knives
- Thread Rolling Dies
- Wear Components
Because of its exceptional wear resistance and long service life, SKD11 is a preferred material for high-volume production tooling.
Material Specification
| Property | Value |
|---|---|
| Material Designation | SKD11 |
| Standard | JIS G4404 |
| Material Family | High Carbon High Chromium Cold Work Tool Steel |
| Density | 7.70 g/cm³ |
| Magnetic Property | Magnetic |
| Typical Supply Condition | Annealed |
| Standard Forms | Round Bar, Flat Bar, Plate, Block, Tooling Stock |
Chemical Composition
| Element | Content (%) |
|---|---|
| Iron (Fe) | Balance |
| Carbon (C) | 1.40–1.60 |
| Chromium (Cr) | 11.00–13.00 |
| Molybdenum (Mo) | 0.80–1.20 |
| Vanadium (V) | 0.20–0.50 |
| Manganese (Mn) | ≤0.60 |
| Silicon (Si) | ≤0.60 |
| Phosphorus (P) | ≤0.030 |
| Sulfur (S) | ≤0.030 |
The high chromium carbide content gives SKD11 exceptional wear resistance and excellent edge retention.
Mechanical Properties
Annealed Condition
| Property | Value |
|---|---|
| Tensile Strength | 750–950 MPa |
| Yield Strength | 500–700 MPa |
| Hardness | 200–255 HB |
| Elastic Modulus | 210 GPa |
Hardened & Tempered Condition
| Property | Value |
|---|---|
| Hardness | 58–62 HRC |
| Wear Resistance | Outstanding |
| Compressive Strength | Excellent |
| Dimensional Stability | Excellent |
Precision Tooling Condition
| Property | Value |
|---|---|
| Hardness | 60–62 HRC |
| Edge Retention | Outstanding |
| Tool Life | Exceptional |
Physical Properties
| Property | Value |
|---|---|
| Density | 7.70 g/cm³ |
| Melting Point | 1420–1460°C |
| Thermal Conductivity | 20 W/m·K |
| Electrical Resistivity | 0.70 μΩ·m |
| Thermal Expansion Coefficient | 10.4 × 10⁻⁶/K |
| Specific Heat Capacity | 460 J/kg·K |
Corrosion Resistance
| Environment | Performance |
|---|---|
| Indoor Environment | Good |
| Dry Atmosphere | Good |
| Humid Environment | Moderate |
| Outdoor Environment | Moderate |
| Marine Environment | Poor |
| Chemical Environment | Moderate |
SKD11 contains approximately 12% chromium but is not considered stainless steel because most chromium exists as carbides.
Recommended surface treatments:
- PVD Coating
- TiN Coating
- TiCN Coating
- DLC Coating
- Nitriding
- Black Oxide
- Hard Chrome Plating
Weldability
| Welding Process | Rating |
|---|---|
| TIG Welding | Poor |
| MIG Welding | Poor |
| Arc Welding | Poor |
| Laser Repair Welding | Fair |
| Tool Steel Repair Welding | Fair |
Due to its high carbon content, SKD11 is difficult to weld.
Recommended:
- Preheating Required
- Controlled Cooling
- Post-Weld Tempering
Machinability
| Process | Rating |
|---|---|
| CNC Turning | Fair |
| CNC Milling | Fair |
| Drilling | Fair |
| Grinding | Excellent |
| EDM Machining | Outstanding |
| Wire EDM | Outstanding |
Machinability Comparison
| Material | Machinability |
|---|---|
| O1 Tool Steel | Excellent |
| A2 Tool Steel | Good |
| SKD11 | Fair |
| D2 Tool Steel | Fair |
| H13 Tool Steel | Good |
SKD11 is typically machined in the annealed state and heat treated afterward.
Heat Treatment
Annealing
| Parameter | Value |
|---|---|
| Temperature | 850–900°C |
| Cooling Method | Furnace Cool |
Preheating
| Parameter | Value |
|---|---|
| Temperature | 650–750°C |
Hardening
| Parameter | Value |
|---|---|
| Temperature | 1000–1030°C |
| Cooling Medium | Air, Vacuum, or Oil |
Tempering
| Parameter | Value |
|---|---|
| Temperature | 180–550°C |
| Cycles | Double Temper Recommended |
Hardness After Heat Treatment
| Condition | Hardness |
|---|---|
| Annealed | 200–255 HB |
| Hardened | 60–63 HRC |
| Hardened & Tempered | 58–62 HRC |
Nitriding
| Property | Value |
|---|---|
| Surface Hardness | 900–1200 HV |
| Wear Resistance | Exceptional |
International Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| JIS (Japan) | SKD11 |
| ASTM / AISI (USA) | D2 |
| DIN (Germany) | 1.2379 |
| EN (Europe) | X153CrMoV12 |
| GB/T (China) | Cr12Mo1V1 |
| ISO | X153CrMoV12 |
| UNS | T30402 |
Available Forms
| Product Type | Availability |
|---|---|
| Round Bar | Yes |
| Flat Bar | Yes |
| Tool Steel Plate | Yes |
| Precision Ground Plate | Yes |
| Mold Blocks | Yes |
| Tooling Stock | Yes |
| Forgings | Yes |
Typical Applications
Metal Stamping Industry
- Blanking Dies
- Progressive Dies
- Piercing Dies
- Trimming Dies
Tool & Die Industry
- Punches
- Cold Forming Dies
- Coining Dies
- Bending Dies
Cutting Tool Industry
- Slitting Knives
- Shear Blades
- Rotary Cutters
- Trimming Tools
Mold Manufacturing
- Cold Work Mold Components
- Wear Inserts
- Precision Mold Parts
Industrial Machinery
- Wear Plates
- Guide Rails
- High-Wear Components
Electronics Industry
- Precision Stamping Tools
- Connector Dies
- Micro-Punches
Manufacturing Characteristics
| Manufacturing Process | Rating |
|---|---|
| CNC Machining | Good |
| Precision Grinding | Outstanding |
| Wire EDM | Outstanding |
| EDM Machining | Outstanding |
| Vacuum Heat Treatment | Outstanding |
| Nitriding | Outstanding |
| PVD Coating | Outstanding |
Advantages
Outstanding Wear Resistance
One of the best cold-work tool steels available.
Excellent Hardness
Can achieve up to 62 HRC after heat treatment.
Exceptional Dimensional Stability
Suitable for precision tooling applications.
Long Tool Life
Reduces maintenance and replacement costs.
Excellent Edge Retention
Ideal for cutting and stamping tools.
Widely Available
Global standard for cold-work tooling.
Limitations
Lower Toughness Than A2
May chip under severe impact loading.
Difficult Machining After Hardening
Requires grinding or EDM processing.
Poor Weldability
Not ideal for frequent repair welding.
Limited Corrosion Resistance
Requires protective coatings.
Comparison with Other Tool Steels
| Property | SKD11 | D2 | A2 | D3 | SKD1 |
|---|---|---|---|---|---|
| Wear Resistance | Outstanding | Outstanding | Excellent | Exceptional | Exceptional |
| Toughness | Moderate | Moderate | Excellent | Lower | Lower |
| Hardness | 62 HRC | 62 HRC | 62 HRC | 64 HRC | 64 HRC |
| Edge Retention | Outstanding | Outstanding | Good | Exceptional | Exceptional |
| Dimensional Stability | Excellent | Excellent | Excellent | Excellent | Excellent |
Comparison with Engineering Materials
| Material | Hardness Potential | Wear Resistance | Toughness |
|---|---|---|---|
| SKD11 | 62 HRC | Outstanding | Moderate |
| D2 Tool Steel | 62 HRC | Outstanding | Moderate |
| A2 Tool Steel | 62 HRC | Excellent | Excellent |
| D3 Tool Steel | 64 HRC | Exceptional | Lower |
| H13 Tool Steel | 54 HRC | Excellent | Excellent |
| 4140 Steel | 58 HRC | Good | Excellent |
Available Surface Finishes
Raw Finishes
- Annealed Finish
- Ground Finish
- Precision Machined Finish
Functional Finishes
- Vacuum Hardened Finish
- Precision Ground Finish
- Wire EDM Finish
- Nitrided Finish
Protective Finishes
- Black Oxide
- TiN Coating
- TiCN Coating
- DLC Coating
- Hard Chrome Plating
- PVD Coating
Frequently Asked Questions (FAQ)
What is SKD11 tool steel?
SKD11 is a high-carbon, high-chromium cold-work tool steel widely used for dies, punches, cutting tools, and wear-resistant components.
What is SKD11 used for?
Typical applications include:
- Stamping Dies
- Punches
- Slitting Knives
- Shear Blades
- Cold Forming Tools
What is the equivalent material to SKD11?
Common equivalents include:
- D2 (USA)
- 1.2379 (Germany)
- Cr12Mo1V1 (China)
- X153CrMoV12 (Europe)
Is SKD11 the same as D2?
Yes. SKD11 and D2 are considered direct equivalents for most industrial applications.
What hardness can SKD11 achieve?
Typically:
- Hardened: 60–63 HRC
- Hardened & Tempered: 58–62 HRC
Is SKD11 suitable for stamping dies?
Yes. It is one of the most widely used materials for high-volume stamping dies.
Can SKD11 be nitrided?
Yes. Nitriding significantly improves wear resistance and service life.
What is the difference between SKD11 and SKD1?
| Property | SKD11 | SKD1 |
|---|---|---|
| Toughness | Better | Lower |
| Wear Resistance | Outstanding | Exceptional |
| Dimensional Stability | Better | Good |
| Modern Usage | Very Common | Less Common |
Why is SKD11 widely used?
Because it combines:
- High Hardness
- Outstanding Wear Resistance
- Excellent Dimensional Stability
- Long Tool Life
- Cost Effectiveness
Does GCNOV provide custom manufacturing services for SKD11 steel?
Yes. GCNOV provides:
- CNC Machining
- Tool & Die Manufacturing
- Wire EDM
- Precision Grinding
- Vacuum Heat Treatment
- Nitriding
- PVD Coating
- Prototype Development
- Low-Volume Production
- Mass Production