18Ni300 Powder: Properties, Applications, and Specifications

18Ni300 powder is a low-carbon, nickel-rich maraging steel powder used chiefly to make high-strength metal parts, including by laser powder bed fusion (LPBF). Its value comes from a combination of printability, dimensional stability during aging, and the potential to achieve high strength after an appropriate heat-treatment cycle. Typical chemistry includes 17–19 wt% nickel, 8.5–9.5 wt% cobalt, and 4.5–5.2 wt% molybdenum, while exact limits depend on the applicable specification and supplier. Buyers should confirm chemistry, particle-size distribution, powder condition, and processing requirements against their own part and qualification needs.

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Key Takeaways

• 18Ni300 is a precipitation-hardening maraging steel; the final properties depend on both the manufacturing route and post-processing.
• It is commonly considered for tooling, molds, and high-strength components where its combination of strength and manufacturing flexibility fits the design.
• Powder is not specified by alloy name alone: verify chemistry, particle-size distribution, morphology, flow behavior, and documentation.
• Request a quotation with your required quantity, target process, particle-size range, and inspection or documentation requirements.

Who This Guide Is For

This guide is for procurement teams, design engineers, additive manufacturing specialists, and toolmakers evaluating 18Ni300 powder. It provides a practical overview of the alloy, its common uses, and the information to compare before requesting a quote. It is not a substitute for the current material standard, supplier certificate, or process qualification. For safety-critical or regulated applications, buyers should establish acceptance criteria with their engineering and quality teams.

What Is 18Ni300 Powder?

18Ni300 is a grade of maraging steel, a family of iron-based alloys strengthened primarily through aging-related precipitation rather than through high carbon content. “18Ni” refers to its approximate nickel level, while “300” is a grade designation, not a guaranteed property value for every powder or finished part. In powder form, the alloy can be used in metal additive manufacturing when the powder characteristics and machine parameters are appropriate. The finished material’s performance depends on factors such as build orientation, porosity, heat treatment, and machining.

Typical Composition and Grade Identification

Commonly reported 18Ni300 chemistry includes approximately 17–19 wt% nickel, 8.5–9.5 wt% cobalt, and 4.5–5.2 wt% molybdenum, with smaller additions such as titanium and a low carbon limit. These figures are general reference ranges, not a replacement for a purchase specification. Grade naming and claimed equivalence to designations such as 1.2709 or other maraging steel names should be verified against the relevant standard and the actual chemistry certificate. Ask the supplier to identify the standard or specification used for the offered material.

Powder Form and Particle Size

For LPBF, 18Ni300 powder is commonly produced by gas atomization, which can yield particles suited to powder spreading; the actual shape and size distribution must be checked for each lot. Commercial offerings may use ranges such as 15–45 µm or 15–53 µm, but these are examples rather than universal requirements. A size range that works on one machine may not be suitable for another, so match it to the equipment, layer thickness, and process qualification plan. Also ask whether the quoted distribution is nominal or measured and how out-of-range particles are controlled.

Properties and Applications

18Ni300 is selected where a maraging steel’s strength potential and ability to be heat treated are useful. In additive manufacturing, it can support complex geometries and integrated features that may be difficult to produce by conventional machining alone. However, “printable” does not mean that every geometry or parameter set will produce a sound part. Users need to validate build orientation, support strategy, density, heat treatment, and finishing for the intended application.

Common Application Areas

• Tooling and mold inserts: Considered for inserts with conformal cooling channels or complex internal features, subject to design and process validation.
• Functional prototypes: Useful when a project requires a metallic prototype with a heat-treatable, high-strength alloy rather than a polymer model.
• Industrial components: May suit selected fixtures, housings, and machine components where the design and operating environment align with the material’s qualified properties.
• Repair or replacement parts: Powder-based production can support complex or low-volume parts, provided the repair route and resulting material condition are approved.

Application suitability should be evaluated against the actual service conditions, including load, temperature, wear, corrosion exposure, and required fatigue performance. Maraging steel is not automatically the best choice for corrosive or high-temperature environments, and a coating or alternative alloy may be needed. Where long-term service data or regulatory approval is required, use documented test results for the relevant production route rather than relying on generic grade descriptions. Discuss these conditions with your engineering team before finalizing the powder specification.

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How to Select 18Ni300 Powder

A reliable selection process starts with the manufacturing method and ends with lot-level verification. Define the part’s performance requirements first, then check that the offered powder and process can be qualified for them. Suppliers may use different atomization, screening, packaging, and inspection practices, so compare documented details rather than relying on the alloy name alone. The following checkpoints help make technical and commercial discussions more specific.

Selection Checklist

1. Confirm the grade basis: State the required designation, chemistry limits, and any governing standard or customer specification.
2. Match the powder to the process: Specify LPBF or another intended process, machine requirements, and the required particle-size distribution.
3. Review powder characteristics: Request available data on particle-size distribution, morphology, flow or apparent density, and cleanliness, as applicable.
4. Define post-processing: Clarify whether the project includes stress relief, aging, hot isostatic pressing, machining, or surface finishing.
5. Set acceptance and traceability needs: Agree on certificate content, lot identification, sampling, packaging, and any additional testing before ordering.

Common Buying Mistakes

A frequent mistake is choosing a particle-size range without checking the machine manufacturer’s recommendations or the existing process window. Another is comparing prices before confirming whether suppliers are quoting the same chemistry limits, test documentation, packaging, and quantity basis. Buyers can also overlook how reused powder, storage conditions, and handling rules affect their own process controls. Ask for clarification on these points before placing a production order, especially when moving from a sample to a larger lot.

Pricing, MOQ, and Lead Time

The price of 18Ni300 powder depends on factors such as order quantity, required particle-size distribution, production availability, packaging, and inspection or documentation requirements. Minimum order quantity (MOQ) and lead time are supplier- and order-specific; they should be confirmed in a current quotation rather than assumed from a general product description. A technically suitable powder may also carry different commercial terms depending on whether it is available from stock or requires a production run. When comparing quotes, evaluate the total supply scope and not just the price per kilogram.

Information to Include in a Quote Request

To help a supplier assess your request, provide the target grade or specification, intended manufacturing process, desired particle-size range, estimated quantity, and destination. Include requirements for chemistry certificates, particle-size reporting, lot traceability, and any other inspection documents. If you are qualifying a new material, explain whether you need a sample quantity before a larger purchase. Clear requirements make it easier to identify differences between offers and reduce avoidable clarification cycles.

How to Evaluate a Supplier

Look for a supplier that can explain how its offered powder maps to your specification and provide documents that identify the material and production lot. Ask how particle-size requirements are controlled, how the powder is packaged for shipment, and what information is available with each lot. If your application has special quality or regulatory requirements, state them early and verify that the supplier can support them; do not assume a certification or test is included unless it is explicitly documented. A responsive technical discussion is also valuable when you are aligning powder characteristics with a qualified process.

Conclusion: Is 18Ni300 Powder Right for Your Project?

18Ni300 powder can be a strong candidate for additive manufacturing and other powder-based applications that benefit from a heat-treatable maraging steel. Its suitability depends on the required service properties, powder specification, production process, and post-processing route—not on the grade name alone. Start by confirming chemistry and particle-size requirements, then review lot documentation and qualification needs with your supplier. For a JINGYE inquiry, share your target specification, process, quantity, and documentation expectations so our team can discuss an appropriate supply option and provide a project-specific quotation.