18Ni300 powder is a low-carbon, nickel-rich maraging steel powder used to produce strong, hard components by laser powder bed fusion (LPBF) and other metal additive manufacturing processes. It is valued for its combination of good strength after aging, dimensional stability during heat treatment, and suitability for complex, near-net-shape parts. For LPBF, successful results depend on more than the alloy name: powder condition, machine parameters, build orientation, stress relief, and aging all affect the final component. This guide explains the material, its applications, key selection criteria, and practical steps for evaluating powder and suppliers.
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This guide is intended for additive manufacturing engineers, tooling designers, procurement teams, and manufacturers assessing 18Ni300 powder for a new or existing LPBF workflow. It is also useful for buyers comparing powder specifications or requesting technical information from a supplier. The recommendations are general rather than a substitute for machine-specific qualification. Validate material and process decisions against your part requirements and applicable specifications.
18Ni300 is a maraging steel: a low-carbon iron-based alloy strengthened primarily through precipitation during aging rather than through a conventional carbon-hardening route. The “18Ni” designation refers to its approximate nickel level, while “300” is associated with a strength class in traditional descriptions; it is not a guarantee that every printed part will reach a particular strength. The alloy is commonly identified with 1.2709, but buyers should confirm the exact grade, chemical limits, and applicable specification on the supplier’s documentation.
Commercial 18Ni300 compositions typically contain iron with approximately 18% nickel, 9% cobalt, 5% molybdenum, and a smaller titanium addition. Actual limits depend on the governing specification and supplier, so these figures are a general description rather than an acceptance standard. Low carbon content is characteristic of maraging steels and helps distinguish them from many conventional tool steels.
| Characteristic | General information | What buyers should verify |
|---|---|---|
| Material family | Precipitation-hardening maraging steel | Grade designation and specification |
| Nominal nickel content | Approximately 18% | Heat-specific chemical analysis |
| Typical LPBF powder size | A 15–45 µm distribution is commonly used for LPBF | Actual particle size distribution and machine compatibility |
| Reference aging schedule | A schedule near 490°C for 6 hours is commonly cited for 18Ni300 | Supplier guidance, furnace control, and part-specific qualification |
These figures are reference points, not universal guarantees. Mechanical properties depend on powder chemistry, build parameters, part geometry, build orientation, heat treatment, and test method. For a critical application, request the supplier’s specification and qualify printed coupons or representative parts using the required test conditions.
18Ni300 is often selected for tooling and engineering parts where high strength after aging and design freedom are both useful. LPBF can produce internal channels, conformal cooling features, and geometries that may be difficult or costly to machine from solid stock. Common application areas include injection molding inserts, die-casting or forming tools, fixtures, and selected high-strength machine components.
Consider the alloy when a part needs a strong, age-hardened steel and the design benefits from additive manufacturing. Tooling inserts with cooling channels are a common example because thermal management can be incorporated into the geometry. The business case is strongest when the design advantage, shorter tooling iteration, or reduced assembly complexity justifies the cost of powder, printing, and post-processing.
18Ni300 is not automatically the best choice for every metal AM part. Compare it with other tool steels or stainless alloys if corrosion resistance, wear behavior, elevated-temperature performance, fatigue life, or material cost is the primary requirement. Also account for post-processing: a printed design may still need support removal, machining, stress relief, and aging before it meets dimensional and functional requirements.
LPBF builds parts by selectively melting successive layers of metal powder with a laser. With 18Ni300, the goal is to establish stable melting and adequate density while managing residual stress, distortion, and defects such as lack of fusion or cracking. The exact settings are machine-, optics-, layer-, and powder-dependent, so a parameter set from one system should not be assumed to transfer directly to another.
Before a build, review the chemical composition, particle size distribution, morphology information if available, and powder handling history. Confirm that the powder is intended for LPBF and is compatible with the equipment’s recoater and layer strategy. Ask how the lot is identified and what inspection or test records are supplied with it.
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Use a validated parameter set for the specific printer, then confirm performance with coupons before committing to production parts. Review laser power, scan speed, hatch spacing, layer thickness, scan strategy, and build plate conditions as an integrated process rather than adjusting one setting in isolation. Assess density and mechanical performance using methods appropriate to the component and customer requirements.
Orientation affects surface finish, dimensional accuracy, support needs, and the direction of material properties. Design supports to manage thermal stress and secure overhangs, while keeping removal and machining access in mind. For tooling with cooling channels, check that the channel geometry can be cleared, inspected, and maintained after printing.
Stress relief, support removal, machining, and aging should be planned before the build. A commonly cited aging reference for 18Ni300 is approximately 490°C for 6 hours, but actual cycles must follow the applicable material guidance and be validated for the component. Heat-treatment atmosphere, furnace uniformity, part mass, and prior thermal history can influence results, so do not treat a reference schedule as a guaranteed recipe.
A good purchasing decision starts with the part’s functional requirements, not a generic powder label. Define the required mechanical properties, dimensional tolerances, surface condition, heat-treatment route, and inspection plan with the engineering and quality teams. Then match the powder specification and supplier documentation to those requirements.
Powder price and availability can vary with order quantity, particle size requirements, packaging, production schedule, and shipping destination. Minimum order quantity and lead time are supplier- and lot-specific, so they should be confirmed in a written quotation rather than assumed from a general product page. When comparing offers, consider the total cost of qualification, shipping, handling, and production risk alongside the price per kilogram.
Ask potential suppliers how they identify and control individual powder lots, what technical documents accompany an order, and whether the requested particle size and chemistry are available. Clarify packaging, delivery terms, sample availability, and the process for handling a quality concern. A responsive supplier should be able to discuss the intended LPBF application and explain which specifications or records can be provided for the quoted product.
At JINGYE, we recommend sharing your printer requirements, target particle size, estimated quantity, and application before requesting a quotation. This helps us assess the appropriate product specification and confirm availability, documentation, packaging, and lead time for your inquiry. For production qualification, align the powder data and your machine-specific process requirements before ordering.
18Ni300 powder is a maraging steel option for LPBF parts that require high strength after aging and may benefit from complex additive geometries. Its suitability depends on the complete manufacturing route, including powder selection, machine-specific parameter qualification, part design, and post-processing. The nominal alloy designation alone does not establish the properties of a finished component.
To move forward, define your part requirements, confirm the powder specification and particle size with the supplier, and plan a representative build and heat-treatment qualification. If you are evaluating 18Ni300 powder for an LPBF project, contact JINGYE with your target specification, application, quantity, and delivery destination so we can discuss product availability and the information needed for your assessment.
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