AISI D2
AISI D2 Tool Steel
AISI D2 Tool Steel
Introduction
AISI D2 is a high-carbon, high-chromium cold-work tool steel renowned for its superior wear resistance, high hardness after heat treatment, and dimensional stability. It is commonly used to make dies, punches, cutting blades, forming tools, and other industrial components that are subjected to abrasive wear.
The high carbon and chromium content, combined with molybdenum and vanadium, contributes to the formation of hard carbides that improve wear resistance. AISI D2 is particularly suitable for cold-work applications where dimensional accuracy and tool life are important.
Although AISI D2 contains a high percentage of chromium, it is not classified as stainless steel and can corrode when exposed to moisture or aggressive environments without suitable protection.
Emirerri Steel supports sourcing enquiries for AISI D2 tool steel according to the required product form, dimensions, material condition, and applicable specifications, subject to availability.
Key Properties
- High wear resistance: Suitable for tools exposed to abrasive wear and repeated cutting operations.
- High hardness: Can achieve high hardness following an appropriate heat-treatment process.
- Good dimensional stability: Suitable for precision tooling when heat treatment is properly controlled.
- High compressive strength: Useful for dies, punches, and forming tools subjected to substantial compressive loads.
- Good resistance to deformation: Supports dimensional accuracy in many cold-work applications.
- Moderate toughness: Impact resistance should be evaluated carefully, especially in applications involving shock loading.
- Heat-treatment capability: Properties can be adjusted through controlled hardening and tempering.
AISI D2 Chemical Composition
AISI D2 is a high-carbon, high-chromium tool steel with molybdenum and vanadium additions. Its chemical composition contributes to carbide formation, hardness, and wear resistance.
| Chemical Element | Typical Composition (%) |
|---|---|
| Carbon (C) | 1.40–1.60 |
| Chromium (Cr) | 11.00–13.00 |
| Molybdenum (Mo) | 0.70–1.20 |
| Vanadium (V) | 0.50–1.10 |
| Manganese (Mn) | 0.10–0.60 |
| Silicon (Si) | 0.10–0.60 |
| Phosphorus (P) | Controlled residual |
| Sulfur (S) | Controlled residual |
Note: These are commonly published ranges for AISI D2. Exact limits depend on the applicable standard, product specification, and material certification. Verify the supplied grade against its material test certificate.
AISI D2 Mechanical Properties
The mechanical properties of AISI D2 depend on the heat-treatment cycle, final hardness, product dimensions, and manufacturing process.
| Mechanical Property | Typical Indicative Value |
|---|---|
| Hardness after heat treatment | Approximately 58–62 HRC |
| Wear resistance | High |
| Compressive strength | High, depending on hardness and condition |
| Impact toughness | Moderate; depends on heat treatment and geometry |
| Dimensional stability | Good when heat treatment is properly controlled |
The hardness range shown is indicative, not a guaranteed value for every product or application. Final properties should be selected according to tool design, loading conditions, section size, and the heat-treatment procedure.
AISI D2 Physical Properties
The physical properties of AISI D2 are relevant to tool design, machining, and heat-treatment planning.
| Physical Property | Approximate Value |
|---|---|
| Density | Approximately 7.7 g/cm³ |
| Modulus of elasticity | Approximately 200–210 GPa |
| Poisson’s ratio | Approximately 0.27–0.30 |
| Thermal conductivity | Varies with temperature and material condition |
| Coefficient of thermal expansion | Depends on the temperature range |
| Specific heat capacity | Depends on temperature and material condition |
Physical-property values can vary with temperature and metallurgical condition. Manufacturer data should be used when precise values are required for engineering calculations.
Grade Specifications and Equivalent Materials
AISI D2 is a commonly used designation for cold-work tool steel. Several international grades are frequently compared with it, but equivalence must be verified before substitution.
| Standard or Country | Comparable Grade |
|---|---|
| AISI / ASTM (USA) | D2 |
| EN / DIN (Europe) | X153CrMoV12 |
| EN Material Number | 1.2379 |
| JIS (Japan) | SKD11 |
| GB (China) | Cr12Mo1V1 — comparable designation to verify |
| Common commercial designation | D2 Tool Steel |
These grades may differ in composition limits, cleanliness, product form, heat-treatment requirements, and mechanical properties. Confirm the applicable standard and material certificate before treating grades as interchangeable.
Additional Notes
When selecting AISI D2 tool steel, consider the following factors:
Product form: Round bars, flat bars, plates, and tool-steel blanks, subject to supplier capability.
Delivery condition: Commonly supplied in an annealed condition for machining before final hardening.
Final hardness: Must be matched to wear, impact, and dimensional requirements.
Dimensional stability: Important for precision dies and tooling components.
Machinability: Depends on the supplied condition and hardness.
Quality assurance: Material certificates, dimensional inspection, and hardness testing may be required.
Traceability: Product markings and documentation should match the supplied batch.
Corrosion Resistance
Despite its high chromium content, AISI D2 is not classified as stainless steel. Its chromium is partly associated with the carbide structure, and its corrosion resistance is limited compared with stainless grades.
Exposure to humidity, seawater, or aggressive chemicals may cause corrosion if the steel is not protected.
Recommended protective measures may include:
Applying corrosion-inhibiting oil during storage.
Using suitable protective coatings where appropriate.
Keeping tools clean and dry after use.
Storing material in a dry environment.
Protecting machined or polished surfaces when required.
For applications requiring high corrosion resistance, a suitable stainless steel or corrosion-resistant tool steel may be a better choice.
Heat Resistance
AISI D2 is primarily designed for cold-work tooling. It should not be confused with hot-work tool steels specifically developed to withstand repeated thermal cycling and elevated operating temperatures.
Prolonged exposure to excessive temperatures can reduce the hardness established during heat treatment and affect wear resistance.
For applications involving substantial heat generation, operating temperature, exposure duration, thermal cycling, and retained hardness must be evaluated. Where hot-work performance is critical, a dedicated hot-work tool steel may be more appropriate.
Heat Treatment
Heat treatment is essential for achieving the required hardness, wear resistance, and dimensional stability of AISI D2. The process must follow a qualified procedure suited to the product dimensions and intended application.
Annealing
AISI D2 is commonly supplied in an annealed condition to facilitate machining before final hardening. The annealing procedure should follow the applicable material specification or manufacturer’s recommendations.
Preheating
One or more controlled preheating stages may be used to reduce temperature gradients and minimize thermal stress before austenitizing.
Austenitizing and Hardening
The steel is heated according to a specified cycle and then cooled using a suitable method. The exact temperatures, holding times, and cooling conditions depend on the section size, process, and required final properties.
Tempering
Tempering is performed after hardening to adjust hardness, improve stability, and reduce internal stresses. The number of tempering cycles and their parameters depend on the selected heat-treatment procedure and service requirements.
Incorrect heat treatment can result in cracking, distortion, or nonconforming hardness. The process should be controlled by qualified personnel and verified through the required inspections.
Welding
AISI D2 is not generally selected for conventional welded fabrication because its high carbon content and hardenability make welding difficult. Risks include cracking, localized hard zones, and changes to the microstructure.
Where welding or repair is necessary, precautions may include:
- Assessing weldability before repair.
- Preparing the repair area carefully.
- Applying controlled preheating according to a suitable procedure.
- Selecting compatible filler material.
- Controlling cooling conditions.
- Performing post-weld heat treatment when required.
- Inspecting the repaired area for defects.
For precision tooling, welding should be evaluated by a qualified specialist. Depending on the damage and component requirements, specialist repair or replacement may be preferable.
Fabrication
AISI D2 is widely used to manufacture precision tools, dies, cutting components, and cold-forming equipment.
Machining
Machining is generally performed in the annealed condition. After hardening, finishing operations may require grinding or other processes suitable for hardened tool steel.
Grinding
Grinding is used to achieve precise dimensions and surface finishes. Process parameters must be controlled to prevent grinding burns, excessive residual stress, or surface cracking.
Cutting
Cutting methods should be selected according to product thickness, geometry, and material condition. Additional machining or finishing may be necessary to achieve the required tolerances.
Inspection After Fabrication
Depending on the application, inspection may include dimensional verification, visual examination, hardness testing, surface inspection, and non-destructive testing where specified.
Applications of AISI D2 Tool Steel
AISI D2 is primarily used for cold-work tooling where high hardness and wear resistance are required.
Industrial Tooling
Blanking and stamping dies.
Punches and forming tools.
Industrial cutting blades.
Shearing tools.
Sheet-metal forming dies.
Metal Processing Industry
Precision cutting tools.
Components exposed to abrasive wear.
Production tooling for repeated manufacturing cycles.
Tooling elements requiring dimensional stability.
Plastics and General Manufacturing
Selected mould and tooling components.
Cutting blades for industrial applications.
Wear-resistant tooling components used in production equipment.
The suitability of AISI D2 should be assessed according to wear mechanisms, impact loading, tool geometry, final hardness, manufacturing requirements, and the intended operating environment.
Emirerri Steel – AISI D2 Tool Steel Supplier
Emirerri Steel supports industrial sourcing requirements for tool steel used in manufacturing, metal processing, and engineering applications. We review AISI D2 enquiries according to the required dimensions, product form, delivery condition, applicable specifications, and quality documentation.
We support project requirements across Tunisia and North Africa, subject to product availability and the agreed technical requirements.
To request a quotation, please provide the required grade, product form, dimensions, quantity, delivery condition, and certification requirements. Availability and delivery schedules are confirmed at the quotation stage.
Conclusion
AISI D2 is a high-carbon, high-chromium cold-work tool steel valued for its high hardness, wear resistance, and dimensional stability after appropriate heat treatment. It is widely used for dies, punches, cutting tools, and precision industrial tooling.
Correct grade selection and heat-treatment control are essential to achieve the required performance. Emirerri Steel can review your AISI D2 requirements and support sourcing in accordance with your project’s technical specifications, subject to availability.
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