Your Position: Home - Other Stainless Steel - SKD61 Tool Steel: Properties, Applications, and Equivalent Grades
SKD61 is a chromium-molybdenum-vanadium hot-work tool steel specified under Japan’s JIS system. It is commonly compared with AISI H13 and EN/DIN 1.2344, but these grades should be treated as comparable rather than automatically interchangeable: the applicable standard, chemistry limits, steelmaking route, heat treatment, and product condition all matter. Buyers typically consider SKD61 for dies, molds, and tooling exposed to elevated temperatures and repeated thermal cycling. This guide explains its properties, applications, equivalent grades, and the information to confirm before ordering.
SKD61 is a medium-carbon alloy tool steel designed for hot-work applications. Its alloy system includes chromium, molybdenum, and vanadium, which contribute to its response to heat treatment and its use in tooling that experiences hot contact. The grade is supplied in different product forms and conditions, so a grade name alone does not fully define the material a buyer will receive.
As a practical reference, commonly published SKD61 chemistry ranges include approximately 0.32–0.42% carbon, 4.75–5.50% chromium, and 1.10–1.75% molybdenum by mass. Exact limits vary with the governing specification and product standard; buyers should confirm the applicable requirements against the supplier’s material certificate. These figures describe composition, not guaranteed performance in a particular tool.
SKD61 is selected where tooling must retain useful strength during hot service and withstand repeated heating and cooling. Its chromium-molybdenum-vanadium alloy design supports hot-work applications such as die casting, forging, and hot forming. Actual performance depends on factors including tool geometry, surface condition, heat treatment, operating temperature, cooling method, and the material being processed.
Thermal fatigue is an important consideration in hot-work tooling. Repeated temperature changes can contribute to surface cracking, while inadequate toughness or unsuitable heat treatment may increase the risk of damage under impact or mechanical loading. SKD61 is not immune to these failure modes, and steel selection should be considered alongside tool design, machining, heat treatment, and maintenance.
Heat treatment has a major effect on hardness, toughness, and dimensional stability. A commonly referenced austenitizing range for H13-type hot-work steel is about 1,020–1,050°C, but the correct cycle depends on the specific material, section size, and heat-treatment procedure. This range is a technical reference, not a universal instruction; use the steel producer’s guidance and a qualified heat treater’s process for the material supplied.
Hardness should be specified in relation to the application and verified after the agreed heat treatment. A single hardness target cannot account for every tool geometry or service condition, and excessive hardness may not be suitable where impact toughness is critical. Before production, align the required hardness range, test location, and any dimensional or distortion limits with the supplier and heat treater.
Application names alone do not determine whether SKD61 is suitable. For example, two die-casting tools may have different thermal loads, cooling arrangements, maintenance intervals, and failure risks. Share the tool’s operating conditions and any prior failure information when comparing grades or requesting a material recommendation.
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| Designation | System or standard family | Buyer consideration |
|---|---|---|
| SKD61 | JIS | Confirm the exact JIS edition, product form, and supply condition. |
| H13 | AISI/ASTM usage | Often treated as a close counterpart; compare the applicable chemistry and quality requirements. |
| 1.2344 / X40CrMoV5-1 | EN/DIN designation | Commonly used as an equivalent reference; verify the specified standard and delivery documentation. |
Equivalent-grade tables are useful for initial sourcing, but they do not establish that every product is identical. Differences in permitted chemistry, cleanliness, manufacturing route, heat treatment, and inspection requirements can affect suitability. If a drawing or customer specification names a particular standard, obtain approval before substituting another designation.
Start by documenting the tooling process and the conditions the material will face. Include operating temperatures, contact material, cyclic heating and cooling, mechanical loads, cooling method, and the expected production duty where known. If the existing tool failed, describe where the damage occurred and whether it involved cracking, wear, deformation, or another issue.
Specify whether you need round bar, plate, block, or another product form, along with finished dimensions or machining allowance. State whether the material should be supplied annealed, pre-hardened, or in another agreed condition. Also identify requirements for cutting, surface condition, dimensional tolerances, and any additional inspection or documentation.
Agree on the intended heat-treatment route and final hardness range before placing the order, particularly for critical tooling. Define how hardness will be measured and documented, and whether the buyer requires testing at a specified location. If the tool is large or has a complex shape, discuss section size and distortion risk with the heat treater rather than relying on a generic cycle.
SKD61 pricing depends on factors such as product form, dimensions, ordered quantity, manufacturing route, delivery condition, machining, inspection, and requested documentation. Minimum order quantities and lead times vary with stock availability and the processing required, so they should be confirmed for each inquiry. A complete request for quotation helps suppliers assess the same scope and reduces the chance of comparing different material conditions.
For a useful quotation, provide the grade and standard, dimensions, quantity, preferred condition, destination, and required documents. If you can accept an equivalent grade, state which substitutions are permitted and whether written approval is needed. Avoid treating a low initial price as a direct comparison unless quality requirements, inspection scope, and delivery terms also match.
At Mingchuan, we can review your SKD61 or equivalent-grade requirements and clarify the information needed for a quotation. Share your specification, dimensions, quantity, delivery condition, and application details so we can assess the requested scope. Where equivalence is proposed, confirm acceptance against your drawing or end-user requirements before production.
SKD61 is a widely used hot-work tool steel for tooling that must handle elevated temperatures and repeated thermal cycling. H13 and 1.2344 are common equivalent designations, but the correct choice depends on the applicable standard, product quality, heat treatment, and service conditions—not the grade name alone. To move forward, prepare your operating details and purchase specification, confirm acceptance requirements, and request a quotation based on the exact material form and condition you need.
Are you interested in learning more about Skd61 Tool Steel? Contact us today to secure an expert consultation!
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