18Ni300 Powder: Properties, Applications, and LPBF/SLM Selection Guide

18Ni300 powder is a powder-bed-fusion feedstock for producing maraging steel parts with a useful combination of strength, dimensional stability, and machinability after suitable processing and aging. It is commonly considered for tooling, molds, and engineering components made by laser powder bed fusion (LPBF), also known as selective laser melting (SLM). The right powder is not defined by alloy name alone: particle-size distribution, chemistry, flow behavior, powder condition, and the intended build and heat-treatment route all matter. This guide explains how to evaluate those factors and what to confirm with a supplier before purchasing.

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Key Takeaways

• 18Ni300 is a precipitation-hardening maraging steel; its final properties depend on the build process and subsequent heat treatment.
• The “18” and “300” in the common designation refer broadly to nominal nickel content and a strength-class designation, not a guaranteed result for every printed part.
• Confirm powder chemistry, particle-size distribution, oxygen or other interstitial limits, documentation, and reuse guidance against your machine and application requirements.
• Request a quote using your required specification, quantity, packaging, delivery location, and documentation needs so the supplier can confirm price and lead time.

Who This Guide Is For

This guide is for design engineers, additive-manufacturing teams, tooling specialists, and purchasing professionals assessing 18Ni300 powder for LPBF/SLM. It is particularly useful when you need to compare powder offers, define incoming inspection criteria, or align a material choice with a part’s service conditions. It is not a substitute for a qualified process specification or part-level testing. For safety-critical or tightly regulated applications, validate the complete material and manufacturing route under your applicable requirements.

What Is 18Ni300 Powder?

Material context

18Ni300 is a low-carbon, nickel-rich maraging steel, commonly associated with the 1.2709 material designation and with “maraging 300” terminology. Maraging steels develop much of their strength through aging, during which fine precipitates form in the steel matrix. Unlike conventional carbon-hardening routes, the material’s hardening response is not based primarily on raising carbon content. However, the exact chemistry and designation equivalence should be verified against the purchase specification rather than assumed from a product name.

The name is a useful shorthand, not a complete powder specification. A commonly cited nominal chemistry includes about 18% nickel, 9% cobalt, 5% molybdenum, and 0.7% titanium by weight, with iron as the balance and other elements controlled by the applicable specification. These values are indicative of the alloy family; allowable ranges and reporting requirements vary by standard and supplier. Ask for the actual chemistry limits and a lot-specific certificate when chemistry is critical to your application.

Why LPBF/SLM users choose it

LPBF/SLM can produce complex metal geometries directly from a digital build file, including internal features that may be difficult to machine conventionally. For 18Ni300, this can support conformal cooling channels in tooling, integrated features, and near-net-shape parts that need later machining. The alloy’s response to aging can be valuable where high strength is a priority. Actual dimensional accuracy, density, surface condition, and mechanical performance depend on the machine, parameter set, build orientation, part geometry, and post-processing.

Properties and Specifications to Evaluate

Powder and alloy characteristics

For a powder purchase, evaluate both the alloy and its suitability for your specific machine. Commonly supplied LPBF powder is gas-atomized and approximately spherical, but morphology and satellite particles vary between production lots. Particle-size distribution is especially important because recoating and powder spreading depend on the machine’s layer system and process settings. A range such as 15–45 μm is used for some powder-bed-fusion products, but it is an example, not a universal requirement for 18Ni300.

Properties after printing and aging

Printed 18Ni300 should not be treated as having one fixed set of mechanical properties. Results vary with process parameters, build orientation, porosity, heat treatment, specimen preparation, and test method. Aging schedules around 480–500°C are commonly encountered in maraging-steel practice, but the suitable schedule must be confirmed for the specific powder, machine process, part geometry, and required properties. Do not apply a generic schedule as a substitute for a qualified procedure or supplier guidance.

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Ask whether published or quoted property data refer to as-built material, stress-relieved material, or aged material. Also confirm specimen orientation, density or porosity measurement method, and whether the data represent powder-specific tests or a general alloy reference. For production parts, qualify representative specimens and inspect critical features using methods appropriate to the design and risk level. This makes the comparison between powder offers more meaningful than relying on a single headline strength value.

Application Matching

Where 18Ni300 may be a suitable candidate

• Injection-molding and die-casting tooling: LPBF can enable conformal channels or integrated design features, while the alloy may suit tooling applications requiring strength after an appropriate process route.
• Tool inserts and repair-related components: Consider it when the design benefits from additive geometry and the part can be qualified for its thermal, mechanical, and wear conditions.
• Engineering parts with complex geometry: It may be useful when strength and design freedom are both important and the component’s service environment is compatible with the material.

Application fit depends on more than alloy strength. Evaluate operating temperature, cyclic loading, corrosion exposure, wear, surface finish, and the feasibility of machining or finishing the printed part. If corrosion resistance, elevated-temperature performance, or a particular fatigue life is essential, compare suitable alternatives and validate the complete part rather than assuming 18Ni300 meets the requirement.

How to Select 18Ni300 Powder for LPBF/SLM

A practical selection framework

1. Define the part requirement. List the required properties, operating conditions, critical dimensions, surface requirements, and applicable standards or internal specifications.
2. Confirm machine compatibility. Share the machine model or relevant recoater and layer-system constraints with the supplier, then compare the proposed powder distribution and handling requirements with your process.
3. Review lot-level data. Request chemistry, particle-size distribution, and available information on morphology, flow, and interstitial content. Confirm test methods and acceptance limits before ordering.
4. Plan the full process route. Include build orientation, support strategy, stress relief if required, aging, machining, and inspection in the qualification plan.
5. Qualify before production use. Use representative builds and test specimens where needed, and document the powder lot and process conditions used.

Common selection mistakes

A frequent mistake is treating “18Ni300” as proof that two powders are interchangeable. Supplier specifications, particle-size distributions, measurement methods, and lot controls may differ. Another risk is comparing mechanical-property values without checking whether they are as-built or heat-treated and whether specimens were printed in the same orientation. Finally, ignoring powder handling and reuse can make an otherwise suitable material difficult to control consistently.

Pricing, MOQ, and Lead Time

18Ni300 powder pricing depends on factors such as order quantity, powder specification, production availability, packaging, and destination. Minimum order quantity and lead time are supplier- and order-specific, so they should be confirmed in a current quotation rather than assumed. If your project needs a small qualification batch, ask whether a sample or trial quantity is available and whether it has the same specification and traceability as production material.

For an efficient quotation, provide the required alloy designation, particle-size range, quantity, delivery destination, target delivery window, and documentation needs. State whether you require lot-specific chemistry data, a certificate, or particular packaging and storage information. If you are replacing an existing powder, sharing the current specification can help the supplier identify differences that may affect qualification.

Supplier Evaluation Checklist

• Can the supplier provide a clear powder specification and lot-level identification?
• Are chemistry and particle-size results reported with relevant limits and test methods?
• Can the supplier explain packaging, storage, handling, and any stated reuse guidance?
• Can they clarify what property data represent and whether they relate to the proposed powder and process route?
• Are MOQ, available quantity, lead time, and documentation confirmed in writing for your order?

At JINGYE, we recommend aligning the powder specification with the customer’s machine, build plan, and inspection needs before confirming an order. Share your target particle-size distribution, quantity, destination, and documentation requirements so our team can review the request and confirm applicable availability, commercial terms, and supporting information. Any application-critical performance should still be validated through your own qualified process and part testing.

Conclusion

18Ni300 powder can be a strong candidate for LPBF/SLM parts that benefit from maraging-steel properties and additive design freedom, particularly tooling and complex engineering components. Selection should be based on verified powder data, machine compatibility, the full heat-treatment route, and application-specific qualification—not the alloy name alone. As a next step, define your part requirements and request a lot-specific specification, commercial quotation, and documentation review from JINGYE. This gives your engineering and purchasing teams a clear basis for evaluating both the material and the supplier.

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