4Cr5MoSiV1 is a chromium-molybdenum-vanadium hot-work tool steel commonly selected for dies, molds, and tooling exposed to elevated temperatures and repeated thermal cycles. Its combination of hot strength, wear resistance, and resistance to heat checking makes it a candidate for applications such as die casting and hot forging, subject to the operating conditions and heat treatment. Buyers often compare it with AISI H13, EN 1.2344, and JIS SKD61, but these grades should be treated as counterparts rather than automatically interchangeable materials. At Mingchuan, we recommend confirming the applicable standard, product condition, dimensions, and inspection requirements before placing an order.
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This guide is intended for purchasing teams, toolmakers, engineers, and distributors assessing 4Cr5MoSiV1 round bar for industrial tooling. It is useful when you need to compare material grades, prepare a purchase specification, or decide whether a hot-work steel is suitable for a particular process. It does not replace an engineering review of die design, service temperature, cooling conditions, or heat treatment. Those factors can affect performance as much as the nominal grade.
4Cr5MoSiV1 is a Chinese-designation hot-work tool steel alloyed principally with chromium, molybdenum, silicon, and vanadium. It is commonly associated with the H13 family of hot-work steels, which are used where tooling must withstand repeated heating and cooling. The grade is supplied in round-bar form for machining into inserts, dies, cores, and other tooling components. Actual suitability depends on the material specification, cleanliness, section size, and the final heat-treatment process.
The ranges below are commonly cited for 4Cr5MoSiV1 under Chinese tool-steel specifications. They are useful for preliminary grade comparison, but they should not be used in place of the purchase standard or the heat-specific inspection documentation. Always check the standard edition and the supplier’s material certificate for the product being purchased.
| Element | Typical composition range | Why it matters in the grade |
|---|---|---|
| Carbon (C) | 0.32–0.42 wt% | Contributes to hardenability and strength after suitable heat treatment. |
| Chromium (Cr) | 4.75–5.50 wt% | Supports hardenability, hot strength, and resistance to oxidation and wear. |
| Molybdenum (Mo) | 1.10–1.75 wt% | Contributes to strength at elevated temperature and tempering response. |
| Vanadium (V) | 0.80–1.20 wt% | Supports wear resistance and grain control through carbide formation. |
| Silicon (Si) | 0.80–1.20 wt% | Acts as an alloying addition associated with hot-work performance. |
4Cr5MoSiV1 is generally chosen for a balance of toughness, hot strength, wear resistance, and resistance to thermal fatigue rather than for a single maximum property. In service, a die may experience pressure, friction, surface heating, and repeated temperature changes. A suitable material and heat-treatment route can help the tool withstand these conditions, but performance also depends on die geometry, cooling, lubrication, surface finish, and maintenance. We advise buyers to share the actual process conditions when requesting a material recommendation.
The delivered hardness depends on whether the bar is supplied annealed, pre-hardened, or in another agreed condition. For hot-work tooling, components are typically machined and then heat treated using a process selected for the part’s size and intended service. Hardness values around 44–52 HRC are often used as an indicative working range for heat-treated H13-family tooling, but this is not a guaranteed value for every 4Cr5MoSiV1 bar or application. Confirm the target hardness, test location, and applicable acceptance method with the heat treater and supplier.
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Application lists are starting points, not a guarantee that one grade will suit every tool. For example, a die operating with severe thermal cycling may need a different heat-treatment or cooling strategy from a component exposed mainly to wear. If the tool is subject to corrosion, unusually high impact, or another dominant failure mode, compare alternative materials and surface treatments with an engineer. Service life should be evaluated against the full tool design and process conditions.
| Designation | System or region | Buyer note |
|---|---|---|
| 4Cr5MoSiV1 | Chinese designation | Specify the governing Chinese standard and product condition. |
| H13 | AISI / North American designation | A widely used comparison within the hot-work tool-steel family. |
| 1.2344 / X40CrMoV5-1 | European designation | Compare the required edition, composition limits, and inspection criteria. |
| SKD61 | Japanese designation | Often compared with H13-family steels, but verify the exact specification. |
These designations are commonly used as equivalents in commercial grade comparisons, but equivalent does not always mean identical. Permitted chemistry, cleanliness requirements, heat-treatment guidance, testing, and delivery conditions may vary between standards or suppliers. For critical tooling, purchase by the required standard and acceptance criteria rather than relying only on a cross-reference chart. If a substitution is proposed, have the responsible engineer review it before production.
A frequent sourcing problem is ordering a material by grade name alone without stating the standard or delivery condition. Another is assuming that H13, 1.2344, SKD61, and 4Cr5MoSiV1 can be substituted without checking chemistry and acceptance requirements. Buyers can also overlook machining allowance, bar straightness, inspection scope, or the intended heat-treatment route. Listing these details in the request for quotation helps suppliers respond with comparable offers.
The price of 4Cr5MoSiV1 round bar can depend on diameter, length, order quantity, production route, delivery condition, inspection requirements, and the applicable standard. Minimum order quantity and lead time are likewise dependent on stock availability and the requested specification, so buyers should confirm them for each inquiry rather than assume a fixed figure. For an accurate quotation, provide the grade and standard, dimensions, quantity, delivery location, required documents, and target delivery schedule. If a specification allows alternatives, identify them clearly so the supplier can quote without changing the material basis unintentionally.
4Cr5MoSiV1 is a hot-work tool steel round bar used for tooling that may require a combination of elevated-temperature strength, wear resistance, and thermal-fatigue performance. H13, 1.2344 / X40CrMoV5-1, and SKD61 are relevant comparison grades, but buyers should verify the governing standard and exact acceptance requirements before treating them as substitutes. To assess suitability, match the material to the process, specify the bar condition and dimensions, and confirm the heat-treatment and documentation requirements. Send Mingchuan your grade standard, size, quantity, application, and delivery needs so we can review the inquiry and provide a quotation based on the requested specification.
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