SKD61 is a chromium-molybdenum-vanadium hot-work tool steel used for dies and tooling exposed to heat, pressure, and repeated thermal cycles. It is valued for its balance of hot strength, wear resistance, toughness, and resistance to heat checking when correctly selected, heat-treated, and maintained. It is commonly compared with AISI H13, but buyers should verify the applicable standard and mill certificate rather than assume every grade or supply condition is identical. This guide explains the grade’s properties, applications, specifications, and the practical checks to make before sourcing it.
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This guide is for die designers, toolmakers, purchasing teams, and manufacturers evaluating hot-work tool steel for new tooling or replacement parts. It is also useful when comparing supplier quotations that use different grade designations or delivery conditions. The information supports initial material selection, but it does not replace a part-specific engineering review or the applicable material standard. For critical tooling, confirm the final specification with your heat treater and tool designer.
SKD61 is a hot-work tool steel designation used in Japanese Industrial Standards. Its alloy system includes chromium, molybdenum, and vanadium, elements that contribute to hardenability, high-temperature strength, and wear resistance after suitable heat treatment. The steel is generally supplied in annealed condition for easier machining before hardening, although available conditions depend on the supplier and product form. Its intended use is tooling that must retain useful strength while operating at elevated temperatures.
SKD61 is commonly treated as a near-equivalent to AISI H13 in commercial discussions. However, standards can differ in composition limits, product requirements, and acceptance criteria, and individual mills may have their own production practices. When a drawing calls for one designation, ask the supplier to identify the standard and provide the heat analysis for the offered material. For a regulated or performance-critical application, obtain engineering approval before substituting grades.
The steel’s useful combination of hot strength and toughness makes it suitable for tooling that experiences thermal cycling and mechanical loading. It can be hardened and tempered to meet a range of application requirements, but final hardness and performance depend on section size, furnace practice, quenching method, and tempering schedule. For this reason, a single hardness value should not be treated as a guarantee of tool life. Discuss the working conditions and the complete heat-treatment route when setting the specification.
The following values are commonly cited composition ranges for SKD61 under JIS-related specifications. They are provided as a screening reference, not as a substitute for the current governing standard or the supplier’s mill test certificate. Confirm the required edition and acceptance limits for your purchase.
| Element | Typical reference range, % by mass | Why buyers consider it |
|---|---|---|
| Carbon (C) | 0.35–0.42% | Supports hardness and strength after heat treatment. |
| Chromium (Cr) | 4.80–5.50% | Contributes to hardenability and resistance to hot wear. |
| Molybdenum (Mo) | 1.00–1.50% | Supports high-temperature strength and tempering response. |
| Vanadium (V) | 0.80–1.15% | Contributes to wear resistance through alloy carbides. |
These ranges do not describe every requirement for a particular order; other elements, cleanliness, and product quality requirements may also apply. Require traceable documentation that links the supplied material to its heat or batch. If your part has demanding fatigue, polishing, or thermal-cycle requirements, define additional quality expectations with the supplier rather than relying on the grade designation alone.
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Heat treatment should be specified and controlled by a qualified processor using recommendations appropriate to the steel size and the intended service. As an indicative reference only, SKD61 hardening practice commonly involves austenitizing in a range around 1,000–1,050°C, followed by controlled quenching and tempering. Tempering is often carried out at elevated temperatures, with the final hardness selected to balance strength and toughness for the tool. These temperatures are not a universal recipe: confirm them with the steel supplier and heat treater for your section size and process.
Where hardness is specified, state the required scale, location, and condition—for example, whether the value applies after final tempering. A target such as 44–52 HRC may be encountered for some hot-work tooling, but it should not be applied to every die or component without design review. Large sections, complex shapes, and critical edges may require particular attention to uniformity and distortion. Request the heat-treatment record or inspection evidence required by your quality plan.
Match the steel to the actual failure mode rather than choosing by application label alone. A die suffering from heat checking may need a different balance of toughness, surface condition, cooling, and operating practice than a component failing from abrasive wear or gross deformation. Consider working temperature, contact pressure, cycle frequency, cooling arrangement, surface treatment, and repair method. For unusually high impact, corrosion exposure, or extreme wear, compare SKD61 with other grades through a documented engineering assessment.
These details make quotations easier to compare and reduce the risk of receiving material that is technically similar but unsuitable for the job. If your design permits a substitute, document the approval process and the specific limits for chemistry, condition, and performance. Confirm tolerances and inspection points before production begins. For repeat orders, keep the approved specification and previous inspection requirements consistent.
SKD61 pricing depends on factors such as product form, dimensions, order quantity, delivery condition, processing, and inspection requirements. Minimum order quantities and lead times vary with stock availability, production scheduling, and the work requested, so they should be confirmed for each inquiry. A low material price may not represent the lowest total cost if it excludes cutting, documentation, or the required condition. When comparing offers, review the complete scope and delivery basis.
At Mingchuan, we can discuss SKD61 requirements for your intended tooling application and review the requested grade, product form, dimensions, and documentation before quotation. Share your drawing or purchase specification, quantity, delivery location, and required condition so we can assess the request. If a substitute grade is being considered, include the approval criteria and any application constraints. This gives both sides a clearer basis for confirming availability, scope, and commercial terms.
SKD61 is a practical candidate for hot-work tooling where elevated-temperature strength, wear resistance, and thermal-cycle performance are required. Its suitability depends on the operating conditions, the exact material specification, and the quality of machining and heat treatment—not just the grade name. To move forward, define your application, specify the governing standard and delivery condition, and request traceable documentation with the quotation. Contact Mingchuan with your dimensions and requirements to discuss an SKD61 supply option for your project.
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