What Is 18Ni300 Powder? Composition, Properties, and Applications

18Ni300 powder is a maraging steel powder designed for metal additive manufacturing, powder metallurgy, and other controlled powder-processing routes. Its name indicates a nickel-rich, low-carbon steel family that can achieve approximately 300 ksi class tensile strength after suitable solution treatment and aging, although the final result depends on chemistry, processing, and heat treatment. I use the term “18Ni300” for a material commonly associated with grades such as Maraging 300, while recognizing that exact specifications can vary by standard and supplier. In this guide, I explain its composition, properties, applications, powder options, and the information B2B buyers should confirm before placing an order.

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What Is 18Ni300 Powder?

18Ni300 powder is produced by converting a maraging steel alloy into fine particles suitable for processes such as laser powder bed fusion, binder-based processing, or selected powder metallurgy applications. Unlike conventional high-carbon tool steels, maraging steels obtain much of their strength through intermetallic precipitation during aging rather than through a high carbon content. This combination can support high strength, good dimensional control, and useful machinability before final aging.

The powder is normally manufactured by gas atomization or another controlled atomization process. Atomization breaks molten alloy into particles, after which the material is classified, inspected, and packaged for a defined application. For additive manufacturing, particle size distribution, flowability, apparent density, morphology, oxygen level, and moisture control are often as important as the nominal alloy designation.

Composition and Metallurgical Characteristics

Typical alloying system

The “18Ni” designation refers to a nominal nickel level near 18%, but commercial 18Ni300 powder also contains other alloying elements that support hardening and processing performance. Depending on the applicable material standard, these may include cobalt, molybdenum, titanium, aluminum, and small controlled additions of carbon and other residual elements. I recommend treating any summary chemistry as indicative until the supplier provides a heat-specific certificate or test report.

In practical procurement, the grade name alone is not enough to establish compliance. I advise buyers to compare the requested standard, nominal chemistry range, particle size distribution, and test method with the supplier’s documentation. This is especially important when a powder will be used for aerospace, tooling, medical, or other applications requiring formal qualification.

Key Properties of 18Ni300 Powder and Consolidated Parts

The most important feature of 18Ni300 is its potential for high strength after aging. A commonly referenced target is around 300 ksi, or approximately 2,070 MPa, ultimate tensile strength for suitable wrought or additively manufactured conditions, but actual values vary with machine parameters, density, specimen orientation, heat treatment, and test standard. Buyers should therefore request property data for the specific manufacturing route rather than assuming that the powder designation guarantees a finished-part result.

18Ni300 can also provide a useful balance of toughness, hardness, dimensional stability, and machinability. Before aging, the material is generally easier to machine than it is after peak aging, which may help manufacturers perform semi-finishing operations before final hardening. The alloy’s response to aging can also reduce the need to achieve all mechanical properties directly during the initial consolidation step.

Powder performance has its own specification requirements. For example, an additive manufacturing powder may be supplied in a particle size range such as 15–45 µm or 20–63 µm, but the correct range depends on the printer, layer thickness, recoating system, and process qualification. A buyer should also review satellite particles, irregular morphology, internal porosity, oxygen and nitrogen levels, flow rate, apparent density, and powder reuse policy where relevant.

Core Functions and Manufacturing Value

18Ni300 powder is primarily selected when a manufacturer needs a strong steel part with complex geometry, good post-machining potential, or a combination of strength and dimensional control. In metal additive manufacturing, it can support the production of internal channels, lattice structures, conformal cooling features, and consolidated components that may be difficult to produce economically from billet. These advantages are application-dependent and should be demonstrated through process development rather than assumed from the alloy name.

The material can also be useful where a part requires a hardened working surface together with a relatively machinable condition during intermediate production. Toolmakers may use the alloy for inserts, molds, dies, and fixtures when the design benefits from additive manufacturing or when conventional fabrication would require several assembled pieces. Final suitability depends on wear, corrosion, temperature, fatigue, and surface-finish requirements.

Typical Applications

Tooling and mold components

Tooling is one of the best-known application areas for 18Ni300 powder. Manufacturers may consider it for injection mold inserts, die components, conformal cooling inserts, and complex tooling where strength and internal geometry are important. The material should still be evaluated against the required wear resistance, thermal cycling behavior, polishability, and cooling performance.

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Additive manufacturing and engineering prototypes

18Ni300 is used in metal additive manufacturing for functional prototypes, low-volume production, repair concepts, and geometrically complex components. Its appeal comes from the combination of a high-strength maraging steel system and the design freedom of powder bed processes. A qualified build recipe is essential because laser power, scan speed, hatch spacing, layer thickness, preheating, and heat treatment can all influence the final part.

Aerospace, energy, and industrial components

Some aerospace, energy, and industrial manufacturers evaluate 18Ni300 for structural or tooling components that require high strength and controlled manufacturing. However, application approval may require traceability, inspection, non-destructive testing, process validation, and customer-specific qualification. I do not recommend selecting the alloy for a critical service environment without confirming the governing specification and required performance data.

Types and Material Options to Consider

18Ni300 powder is not a single universal product format. Options may differ by atomization method, particle size distribution, powder morphology, packaging, and intended process. Gas-atomized powder is commonly considered for laser-based additive manufacturing because spherical particles can support flow and packing, while other powder formats may be appropriate for different consolidation technologies.

• Fine powder: May suit processes using thin layers or smaller feature sizes, subject to machine requirements.
• Standard additive-manufacturing powder: Often selected according to the equipment manufacturer’s recommended distribution.
• Coarser powder: May be considered for selected binder-based or powder metallurgy routes, depending on compaction and sintering conditions.
• Customized powder: May involve a defined chemistry range, PSD, packaging format, or inspection plan for a qualified project.

Powder reuse is another practical distinction. Recycled powder may change in oxygen level, particle distribution, morphology, or contamination status after repeated exposure to heat and handling. I advise buyers to establish acceptance limits and a documented sampling method before using reused powder in production.

Key Specifications Buyers Should Review

Before purchasing, I recommend preparing a technical specification that covers chemistry, PSD, morphology, density, flowability, packaging, and documentation. The buyer should state the intended process and equipment because a powder that performs well in one machine may not transfer directly to another. Lot traceability is also valuable for investigating build defects, mechanical-property variation, or powder-reuse issues.

• Applicable grade or material standard
• Heat or lot number and certificate of analysis
• Particle size distribution and test method
• Oxygen, nitrogen, hydrogen, and moisture controls where required
• Apparent density, flowability, and morphology information
• Packaging weight, sealing method, and storage conditions
• Recommended handling, sieving, and reuse guidance

For a production project, buyers may also request sample powder for machine trials. A sample evaluation can compare spreadability, flow behavior, density, surface quality, porosity, tensile properties, and heat-treatment response. These checks provide more useful evidence than relying only on a product label or a general datasheet.

How to Select an 18Ni300 Powder Supplier

I suggest evaluating a supplier on both material control and communication quality. The supplier should be able to explain the available grade, powder production route, specification limits, inspection documents, packaging, and expected lead-time structure without making unsupported performance promises. For international purchasing, export packaging, labeling, customs documentation, and response speed should also be part of the assessment.

At JINGYE, we support B2B inquiries by discussing the intended application, processing route, required particle size, order quantity, and documentation needs before recommending a product option. We can help buyers organize a clear inquiry so that the quotation reflects the technical requirement rather than only the keyword “18Ni300 powder.” Availability, minimum order quantity, lead time, and test documentation should be confirmed for each specific request.

Questions to ask before ordering

1. Which standard or chemical range does the product follow?
2. What particle size distribution is available for the target equipment?
3. Which inspection documents accompany the powder lot?
4. How is the powder packaged, stored, and protected from moisture?
5. Can the supplier provide a sample for process validation?
6. What are the commercial terms, minimum order quantity, and expected delivery schedule?

Summary Insight

18Ni300 powder is a nickel-rich maraging steel powder selected for high-strength applications where additive manufacturing or controlled powder processing offers a design or production advantage. Its performance comes from the interaction of alloy chemistry, powder quality, consolidation parameters, and solution-aging treatment; the grade name alone does not guarantee a specific finished-part result. The most important buying factors are verified chemistry, suitable particle size distribution, reliable lot documentation, and process compatibility.

My practical recommendation is to define the application and manufacturing route first, then request a heat-specific specification and sample when qualification is important. If you are sourcing 18Ni300 powder for tooling, additive manufacturing, prototyping, or industrial production, contact JINGYE with your target process, particle size, quantity, and documentation requirements. We can then discuss an appropriate supply option and the next steps for technical and commercial evaluation.

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