SKD61 is a chromium-molybdenum-vanadium hot work tool steel used for tooling exposed to heat, pressure, and repeated thermal cycling. It is commonly compared with AISI H13 and 1.2344, but equivalent designations should be treated as close material counterparts—not automatic guarantees of identical chemistry, processing, or performance. Buyers typically select SKD61 for die-casting dies, extrusion tooling, and hot-forming components where hot strength, wear resistance, and resistance to heat checking matter. In this guide, we explain its main properties, typical uses, grade comparisons, and the checks to make before ordering.
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SKD61 is a JIS-designated hot work tool steel intended for tooling that operates at elevated temperatures. Its alloying system supports a useful balance of hot hardness, toughness, wear resistance, and resistance to thermal fatigue when the steel is correctly processed for its intended service. Those properties make it a common candidate for tooling that repeatedly contacts hot metal or experiences rapid temperature changes.
As a reference, commonly published JIS composition limits for SKD61 include 0.35–0.42% carbon, 4.80–5.50% chromium, 1.00–1.50% molybdenum, and 0.80–1.20% vanadium. Silicon is typically specified at 0.80–1.20%, while manganese is limited to 0.50% maximum. Always confirm the current governing specification and the supplier’s material certificate, since chemistry requirements and reporting conventions can vary by standard or order.
Chromium contributes to hardenability and resistance to wear and oxidation, while molybdenum and vanadium support strength and stability during hot service. Carbon contributes to hardness after heat treatment, but hardness alone does not determine whether a tool will perform well. Tool geometry, steel cleanliness, heat treatment, surface condition, and operating conditions also influence service life.
SKD61 is generally supplied in an annealed condition for machining, or in a heat-treated condition when specified. A hardness value should therefore be tied to the delivery condition and the agreed process; a single hardness figure cannot describe every SKD61 product. If a project requires a particular hardness range, ask the supplier to confirm whether it applies to the supplied stock, a test coupon, or the finished tool.
Depending on the supplier’s available stock and production capability, SKD61 may be offered as round bar, flat bar, plate, or cut-to-size stock. Availability, dimensions, and surface condition are supplier-specific and should be confirmed before placing an order. For machined or heat-treated parts, clarify whether the quotation covers raw material only or includes additional processing.
SKD61 is often considered for aluminum and other non-ferrous metal die-casting dies, hot extrusion dies, hot forging dies, and hot-forming tooling. These applications can expose tool surfaces to elevated temperatures, mechanical loading, and repeated heating and cooling. The exact service conditions differ significantly, so a grade that suits one tool may not be the best choice for another.
| Application | Why SKD61 May Be Considered | Checks Before Selection |
|---|---|---|
| Die-casting dies | Designed for hot work and repeated thermal exposure | Heat checking, cooling layout, die dimensions, and maintenance plan |
| Hot extrusion tooling | Offers a combination of hot strength and wear resistance | Billet material, extrusion temperature, load, and tool geometry |
| Hot forging dies | Can be evaluated for tooling under heat and impact | Impact severity, required toughness, and heat-treatment condition |
| Hot-forming components | May suit components exposed to elevated temperatures | Operating cycle, surface requirements, and repair method |
These are common application areas, not a guarantee of suitability. Share operating temperatures, loading, cooling conditions, and failure history with a qualified tool designer or material specialist before finalizing the grade.
AISI H13 and EN 1.2344 are frequently used as equivalents or close comparison grades for SKD61. The designations point to broadly similar chromium-molybdenum-vanadium hot work steel families, but their requirements come from different standards. Differences in permitted chemistry, product form, manufacturing route, cleanliness requirements, heat treatment, or inspection can matter in production.
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| Designation | Common Standard Context | Buyer’s Note |
|---|---|---|
| SKD61 | Japanese Industrial Standards (JIS) | Specify the applicable JIS edition and required delivery condition. |
| H13 | Commonly associated with ASTM tool-steel specifications | Confirm the exact specification, product form, and chemistry requirements. |
| 1.2344 / X40CrMoV5-1 | European grade designation | Check the applicable EN requirements and any supplementary conditions. |
When a drawing or qualified process specifies one grade, do not substitute another based on designation alone. Compare chemical composition, steelmaking and product requirements, supplied condition, and any project-specific acceptance criteria. For critical tooling, have the engineering or quality team approve the substitution in writing.
Record the workpiece material, operating temperature, cycle frequency, mechanical load, cooling method, and expected failure mode. If a tool failed previously, document where the damage occurred and whether it was cracking, wear, deformation, or heat checking. This information helps distinguish a material issue from a design, processing, or operating issue.
State the grade and governing standard, product form, dimensions, quantity, and delivery condition. Include requirements for machining allowance, surface finish, straightness, testing, or heat treatment where they apply. Avoid vague requests such as “H13 equivalent” when the project requires controlled chemistry or inspection.
Ask for a material test certificate showing the reported chemistry and traceability for the supplied lot. Confirm what inspection or testing is included, and whether any additional requirements need to be quoted separately. For processed parts, clarify who is responsible for heat treatment and what records will be supplied.
SKD61 pricing depends on factors such as dimensions, product form, order quantity, origin, processing, and inspection requirements. Minimum order quantities and lead times are not fixed properties of the grade; they vary with stock availability and the work requested. Request an itemized quotation that separates material, cutting, heat treatment, machining, testing, packaging, and delivery where relevant.
For a reliable comparison, send suppliers the same specification and order details. Ask them to state the quoted grade, standard, condition, dimensions, tolerance, documentation, MOQ, and estimated dispatch schedule. Confirm whether the quoted timing begins after technical approval, payment, or another agreed milestone.
At Mingchuan, we support B2B buyers evaluating SKD61 hot work steel for material supply and sourcing requirements. Share your target grade, dimensions, quantity, application, and required documents so our team can review the request and clarify available options. Where a substitute grade is being considered, provide the governing drawing or specification for review before confirming the order.
SKD61 is a widely used hot work tool steel for applications such as die casting, extrusion, and hot forming, where a balance of hot strength, wear resistance, and toughness is required. H13 and 1.2344 are common comparison grades, but they should not be treated as automatically interchangeable without checking the applicable standards and project requirements. The practical next step is to define the operating conditions, confirm the required material specification and supply condition, and compare documented quotations. Contact Mingchuan with your dimensions, quantity, and technical requirements to discuss suitable SKD61 supply options.
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