Sep. 15, 2026
Minerals & Metallurgy
18Ni300 powder is a maraging steel powder designed for metal additive manufacturing, especially laser powder bed fusion (LPBF). Its name refers to a nickel-rich, low-carbon steel family that commonly contains approximately 18% nickel, with cobalt, molybdenum, titanium, and iron providing the main alloying balance. I view it as a strong candidate for tooling, aerospace components, engineering prototypes, and other parts that require high strength after a controlled aging treatment.
Unlike conventional carbon steels, 18Ni300 develops much of its final strength through precipitation hardening rather than high carbon content. In LPBF, the powder must also meet requirements for particle size distribution, flowability, apparent density, morphology, cleanliness, and chemical consistency. Because exact chemistry and powder specifications can vary by standard and supplier, I recommend confirming the certificate of analysis and processing guidance before placing a production order.
The nominal chemistry of 18Ni300 is based on a low-carbon maraging steel system. Nickel supports the formation of a soft, workable martensitic matrix after cooling, while cobalt and molybdenum contribute to precipitation strengthening during aging. Titanium and other controlled additions may also participate in the formation of strengthening precipitates.
| Element or characteristic | Typical role or reference value |
|---|---|
| Nickel | Approximately 18 wt.% in the nominal grade designation |
| Cobalt | Often included at approximately 8–10 wt.% in common 18Ni300 formulations |
| Molybdenum | Commonly around 4–5 wt.% to support precipitation strengthening |
| Titanium | Usually a controlled minor addition, often below 1 wt.% |
| Carbon | Maintained at a low level compared with conventional carbon steel |
These values are useful for understanding the alloy family, but they should not replace a batch-specific chemical analysis. Equivalent designations such as 1.2709, M300, or maraging steel 300 may be used in different markets, yet the applicable specification and permitted composition ranges should be checked carefully. I recommend comparing the supplier’s certificate with the exact standard requested by the machine manufacturer or end user.
For LPBF, 18Ni300 powder is generally supplied as gas-atomized spherical particles. A commonly offered particle size range is approximately 15–53 micrometers, although some machines require a narrower distribution such as 15–45 micrometers or another validated range. Spherical morphology can support powder flow and packing, while excessive satellites, irregular particles, moisture, or foreign contamination may reduce process stability.
Important powder data includes particle size distribution, apparent density, tap density, flow rate, oxygen content, nitrogen content, morphology, and recycling guidance. These measurements should be interpreted together rather than viewed as isolated sales specifications. In my experience, a powder that matches the machine’s recoater and layer-thickness requirements is more useful than one selected only by nominal alloy name.
As-built 18Ni300 parts can provide useful strength, but the material is commonly aged after printing to increase hardness and tensile performance. A typical aging temperature used in maraging steel processing may be around 480–500°C, with the exact temperature and holding time determined by the material specification, part geometry, and validated process. Hardness values around 50–55 HRC are often associated with aged 18Ni300-type material, but I would treat this as a reference range rather than a guaranteed result.
The final properties depend on laser parameters, scan strategy, build orientation, porosity, surface condition, stress relief, aging cycle, and test direction. Heat treatment can improve strength while affecting dimensional stability and toughness. For critical components, I recommend qualifying the full material and manufacturing route instead of relying only on a powder datasheet.
One of the most established application areas is tooling for injection molding and die-related production. LPBF allows designers to create internal cooling channels that follow the shape of a mold cavity more closely than conventional drilled channels. 18Ni300 can be attractive when the tool requires a combination of strength, machinability after treatment, and additive-manufacturing compatibility.
The business value is not simply the alloy itself. The main opportunity is the combination of suitable steel properties and geometric freedom, which may support shorter cooling paths or more complex insert designs. Before production, I would evaluate thermal cycling, corrosion exposure, polishing requirements, dimensional tolerances, and the possibility of hot-isostatic pressing or other post-processing.
18Ni300 powder is also considered for brackets, housings, tooling aids, fixtures, and selected structural or functional components. Its strength-to-weight advantage comes primarily from the ability to produce optimized geometries, not from the powder alone. For aerospace or safety-related parts, the buyer must additionally define traceability, inspection, nondestructive testing, heat-treatment control, and qualification requirements.
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For industrial prototypes and production fixtures, 18Ni300 can offer a practical balance between strength and printability. It may be suitable where a component needs to be stronger and more durable than a polymer or lower-strength metal alternative. However, the best choice still depends on temperature, wear, corrosion, fatigue, machining, and expected service life.
Suppliers may offer 18Ni300 powder in different particle size distributions, packaging formats, and production routes. Gas-atomized powder is commonly preferred for LPBF because its morphology is generally more compatible with automated powder spreading. Buyers may also need to choose between virgin powder, recycled powder, or a controlled blend, depending on the machine manufacturer’s procedure.
Packaging is important because metal powder can be affected by moisture, oxygen exposure, handling, and contamination. I recommend specifying net weight, container type, sealing method, lot identification, and storage instructions in the purchase documents. For repeat production, maintaining the same particle-size range and powder management method can simplify process control.
For LPBF, layer thickness is often selected within approximately 20–60 micrometers, but this is a machine- and parameter-dependent value rather than a universal setting. The powder size should be compatible with the recoater, laser system, and validated process window. I recommend requesting a sample or technical review when the powder will be used on a new machine or for a new geometry.
I start with the application rather than the grade name alone. The key questions are the required mechanical properties, printing technology, target particle size, part dimensions, post-processing route, annual volume, and documentation level. This approach helps separate a prototype purchase from a regulated or repeat-production requirement.
I also encourage buyers to compare suppliers using consistent criteria. A lower unit price may not represent lower total cost if the powder requires additional screening, produces unstable flow, or lacks the documentation needed for qualification. Lead time, minimum order quantity, packaging, export handling, technical communication, and repeat-lot consistency should all be included in the sourcing decision.
At JINGYE, I understand that B2B buyers need more than a material name and a price. We can discuss the required alloy designation, particle size distribution, packaging quantity, documentation, and intended LPBF application before preparing a quotation. Where the exact specification is not yet fixed, I can help organize the technical questions needed for a more accurate comparison.
Our role is to support a practical purchasing process: clarify requirements, align the powder with the customer’s application, and communicate available supply conditions. Any composition, test value, delivery schedule, or certificate should be confirmed for the specific production lot rather than assumed from a general product description. This is especially important when the powder will be used for qualified components or long-term production.
18Ni300 powder is a strong option when I need a maraging steel for LPBF parts that combine additive-manufacturing design freedom with high strength after aging. It is particularly relevant to conformal-cooling tooling, fixtures, engineering components, and selected aerospace-related applications. Its suitability cannot be confirmed by the alloy name alone, because powder quality and process qualification strongly influence the finished part.
My recommended next step is to define the machine model, particle size requirement, chemistry standard, part application, heat-treatment plan, documentation level, and expected quantity. Send these details to JINGYE, and we can review the appropriate 18Ni300 powder specification, packaging, MOQ, and supply conditions for your project.
If you are looking for more details, kindly visit 18Ni300 powder.
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