18Ni300 Powder Guide: Composition, Properties, Applications, and LPBF Selection

18Ni300 powder is a maraging steel powder developed for laser powder bed fusion (LPBF) and related metal additive manufacturing processes. In simple terms, it is a low-carbon, nickel-rich steel that obtains much of its final strength through post-build aging rather than only through the printing step. When I evaluate 18Ni300 powder for a customer, I focus on four questions: whether the chemistry matches the required grade, whether the powder flows and spreads consistently, whether the printed part can be heat treated correctly, and whether the supplier can provide reliable batch documentation.

Click here to get more.

The “18Ni300” designation commonly refers to a maraging steel family containing approximately 18 wt% nickel, with iron as the balance and strengthening additions such as cobalt, molybdenum, and titanium. Exact chemistry, particle-size distribution, morphology, oxygen level, and process recommendations can vary by manufacturer. For this reason, I recommend confirming the supplier’s certificate of analysis, powder specification, and LPBF parameter guidance before approving a material for production.

Who This Guide Is For

This guide is intended for design engineers, additive manufacturing engineers, purchasing teams, mold and tooling specialists, and companies comparing metal powder suppliers. It is also useful for organizations moving from prototype printing to repeatable production. My aim is to provide a practical framework for evaluating 18Ni300 powder without treating general material information as a substitute for a product-specific datasheet or qualification program.

What 18Ni300 Powder Is

Composition and Material Concept

18Ni300 is generally classified as a maraging steel rather than a conventional high-carbon tool steel. Its low carbon content supports good weldability and helps make it suitable for layer-by-layer laser processing, while nickel and age-hardening elements contribute to its final mechanical performance. A typical specification may include around 18 wt% nickel, cobalt and molybdenum additions, a small titanium addition, and iron as the balance, but the allowable ranges must be checked against the relevant grade standard or supplier specification.

The material is normally supplied as spherical or near-spherical gas-atomized powder for LPBF. Spherical morphology can support improved flow and more uniform powder spreading, although morphology alone does not guarantee successful printing. I also review satellites, agglomerates, internal porosity, oxygen content, moisture control, and the percentage of reused powder when assessing a batch.

Properties Before and After Aging

As-built 18Ni300 parts can offer a useful combination of strength, dimensional stability, and machinability, but the final property profile depends on build orientation, laser parameters, density, heat treatment, and post-processing. The material is commonly selected because aging can substantially increase hardness and strength through precipitation reactions. A supplier should therefore distinguish clearly between as-built data and aged-condition data instead of presenting one value as universally applicable.

The “300” designation is commonly associated with a nominal strength class near 300 ksi after suitable aging, but this should be treated as a grade reference rather than a guaranteed result for every printed part. Actual tensile strength, yield strength, elongation, hardness, and impact behavior require confirmation through the supplier’s test data and the buyer’s own qualification method. I recommend specifying the required condition, test orientation, heat-treatment cycle, and acceptance criteria in the purchase documentation.

Core Applications of 18Ni300 Powder

18Ni300 powder is often considered for tooling inserts, injection mold components, conformal cooling inserts, aerospace and industrial prototypes, high-strength brackets, and complex metal parts that are difficult to machine conventionally. Its value is strongest where additive manufacturing can create internal channels, lightweight structures, or complex geometries that improve the overall design. It is not automatically the best choice for every high-temperature, corrosion-resistant, or wear-intensive application.

Tooling and Conformal Cooling

For mold and die applications, the main attraction is the ability to design cooling channels close to the working surface. Better channel geometry can help engineers manage heat extraction, although the actual benefit depends on channel layout, wall thickness, thermal contact, and the molding process. After printing and heat treatment, machining, sealing, inspection, and surface finishing may still be required.

Functional Prototypes and Production Components

For prototypes, 18Ni300 can provide a closer representation of a production-grade metal part than many lower-strength materials. For production components, I would evaluate fatigue requirements, corrosion exposure, service temperature, and inspection access before selecting it. The material is often attractive for high-strength, complex parts, but the design must still account for support removal, anisotropy, residual stress, and post-processing allowances.

JINGYE supply professional and honest service.

18Ni300 Powder Specifications to Review

Powder selection should begin with measurable characteristics rather than only the material name. Common LPBF powder size ranges include approximately 15–53 µm, but the correct distribution depends on the printer, recoater, layer thickness, and powder-handling system. Typical LPBF layer thickness may be about 20–60 µm, but I recommend using the machine manufacturer’s validated range instead of assuming that a general powder specification will work unchanged.

How to Select 18Ni300 Powder for LPBF

Step 1: Define the Part and Performance Requirement

I first identify the part’s function, expected loads, operating environment, surface requirements, and production volume. A mold insert may prioritize thermal management and machinability, while an aerospace prototype may prioritize strength-to-weight ratio and inspection traceability. This step prevents the powder grade from being selected only because it is familiar or readily available.

Step 2: Match the Powder to the Machine

Next, I compare the powder specification with the LPBF machine’s recoater, filter system, laser configuration, build chamber controls, and validated material library. A powder can meet a nominal particle-size range and still require parameter development on a particular machine. Buyers should request recommended laser power, scan speed, hatch spacing, layer thickness, and build-plate conditions, while treating those values as starting points rather than guaranteed production settings.

Step 3: Plan Heat Treatment and Post-Processing

18Ni300 is usually evaluated together with a solution or stress-relief treatment and an aging treatment appropriate to the selected grade and part geometry. The exact cycle should be established through the material supplier, equipment provider, or engineering qualification process because section thickness and build condition can affect results. I also include machining, shot peening, surface treatment, dimensional inspection, and non-destructive testing in the process plan when they are relevant to the application.

Step 4: Qualify the Batch and Process

Before production release, I recommend printing representative specimens or a qualification coupon using the intended machine, parameters, orientation, and heat-treatment route. Testing may include density evaluation, tensile testing, hardness, dimensional inspection, metallography, and defect analysis, depending on the application risk. This approach is more reliable than assuming that a powder certificate alone proves final part performance.

Common Selection Mistakes

One common mistake is treating all 18Ni300 powders as interchangeable. Differences in atomization, sieving, oxygen control, particle distribution, and packaging can affect process stability even when the alloy name is the same. Another mistake is comparing prices without considering yield, powder reuse policy, qualification effort, lead time, and the cost of rejected builds.

I also advise against specifying only “18Ni300 powder” on a purchase order. The order should identify the required chemistry, particle-size range, packaging quantity, documentation, storage condition, and whether virgin or recycled powder is acceptable. If a customer needs a specific standard, printer compatibility, or heat-treatment condition, that requirement should be written explicitly and confirmed before shipment.

How to Evaluate a Supplier

When I support a buyer through supplier evaluation, I recommend checking whether the supplier can provide stable batch identification, clear technical data, and practical communication about LPBF use. JINGYE can discuss material requirements, powder specifications, packaging options, documentation needs, and application considerations with customers before an order is finalized. The exact availability, minimum order quantity, and lead time should be confirmed according to the requested grade, quantity, and inspection requirements.

Supplier Checklist

• Can the supplier provide a batch-specific certificate of analysis?
• Are particle-size distribution and morphology data available for the proposed powder?
• Can the supplier explain storage, handling, and powder reuse recommendations?
• Are packaging size, labeling, and traceability suitable for your production system?
• Can the supplier support sample evaluation before a larger purchase?
• Are technical questions answered with product-specific information rather than generic alloy descriptions?

Key Takeaways

• 18Ni300 is a nickel-rich maraging steel powder commonly used for LPBF metal additive manufacturing.
• The nominal composition includes approximately 18 wt% nickel, but the complete chemistry must be confirmed by batch documentation.
• Final properties depend on powder quality, machine parameters, build orientation, heat treatment, and post-processing.
• Common powder ranges such as 15–53 µm and layer thicknesses around 20–60 µm are starting references, not universal specifications.
• Supplier traceability, technical support, and qualification cooperation are as important as the material price.

Conclusion and Next Steps

18Ni300 powder is a practical option when a project needs a high-strength maraging steel for complex LPBF parts, especially tooling inserts and components that benefit from additive design freedom. The correct choice depends on more than the alloy designation: I would verify chemistry, powder morphology, particle-size distribution, machine compatibility, heat treatment, and inspection requirements together. This is the most dependable way to connect powder selection with actual part performance.

For the next step, prepare your printer model, target particle-size range, required quantity, application, heat-treatment condition, and documentation requirements. JINGYE can then help review the material specification and discuss a suitable supply plan for your evaluation or production inquiry. Contact us with these details so we can provide a more relevant quotation and technical response for your 18Ni300 powder requirement.

If you want to learn more, please visit our website 18Ni300 powder.