FCS 8418 Tool Steel

8418 Tool Steel Chemical Composition

8418 Tool Steel Reference Grades

The reference materials for comparison with FCS 8418 are as follows:

1. Germany (DIN / W-Nr.): X38CrMoV5-3 / 1.2367
2. Sweden (Uddeholm): DIEVAR
3. Austria (BÖHLER): W303

W303 / 1.2367 provides a chemical-composition reference, while DIEVAR provides a comparison for hot work applications. These materials are not stated to be exact equivalents of FCS 8418.

8418 Tool Steel Specifications

8418 Tool Steel Customized Options

1. Custom Surface Conditions: Specify black/as-forged, sandblasted, ground, turned, machined or milled surfaces.
2. Custom Chemical Requirements: Additional chemical limits can be submitted for technical review and incorporated into an agreed material specification.
3. Custom Specifications: Specify round-bar diameters, flat-bar thickness and width, block dimensions and machining allowances.
4. Custom Packaging Requirements: Specify corrosion protection, protective wrapping, wooden cases and handling requirements for storage and transportation.
5. Production to Technical Agreements: Submit drawings, samples or technical requirements for assessment and quotation.
6. 8418 Tool Steel Electroslag Remelting (8418 ESR): ESR is included in the published FCS 8418 production route. Additional cleanliness and internal-quality requirements should be specified in the order.

8418 Tool Steel Smelting process

8418 Tool Steel Physical Properties

8418 Tool Steel Physical Properties

1. Density: Approximately 7.80 g/cm³ at 20°C.
2. Elastic Modulus: Approximately 210 GPa at 20°C.
3. Thermal Conductivity: Approximately 31 W/(m·K) at 400°C and 32 W/(m·K) at 600°C.
4. Mean Coefficient of Thermal Expansion: Approximately 12.7 × 10⁻⁶/K over 20–400°C and 13.3 × 10⁻⁶/K over 20–600°C.
5. These values apply to Uddeholm DIEVAR in the hardened and tempered condition, approximately 44–46 HRC.

8418 Tool Steel Mechanical & Performance Properties

1. Thermal Fatigue Resistance: The product is described for applications involving repeated heating and cooling, where surface heat checking is a concern.
2. Thermal Shock Crack Resistance: Relevant to hot work tooling exposed to rapid temperature changes.
3. Hot-Wear Resistance: Relevant to working surfaces in repeated contact with hot metal.
4. Resistance to Plastic Deformation: Relevant to maintaining tool geometry under combined thermal and mechanical loading.
5. Heat-Treatment-Dependent Performance: Final working hardness and mechanical properties depend on heat treatment, section size and tooling requirements. The annealed delivery hardness is not the finished tool’s service hardness.

8418 Tool Steel Product Applications

1. Die-Casting Molds: Non-ferrous alloy die-casting molds, including aluminum, magnesium and zinc applications.
2. Hot-Forging Dies: Tooling for hot-forging operations, selected according to the workpiece alloy, forming temperature and loading conditions.
3. Hot-Extrusion Dies: Extrusion tooling assessed according to the processed alloy, operating temperature and die geometry.
4. Die Blocks and Inserts: Cavity blocks and replaceable inserts within these hot work applications, subject to assessment of section size, cooling and mechanical loading.