Advanced rare-earth magnets and integration components matching extreme aerospace-grade mechanical structures.
A deep metallurgical inspection of structural reliability, precision values, and design guidelines.
Maraging Steel 300 (also referenced systematically as Grade 300, 18Ni300, or Vascomax® 300) represents the pinnacle of ultra-high-strength iron-nickel alloys. Unlike traditional martensitic carbon steels that derive their strength from carbon precipitation, Maraging alloys are carbon-free, utilizing the age-hardening of cobalt, molybdenum, titanium, and aluminum to achieve unprecedented yield points. The name itself reflects the physical mechanism: martensitic aging.
The base matrix of Maraging Steel 300 is a very low-carbon iron-nickel martensite. During heat treatment, solution annealing transforms the alloy into a tough, ductile martensite phase. Subsequent aging at approximately 480°C (900°F) results in the uniform dispersion of intermetallic compounds ($Ni_3Mo$, $Ni_3Ti$, and $Fe_2Mo$) within the carbon-free martensitic matrix. This unique structure completely eliminates the brittleness associated with carbon-based hardening, maintaining high fracture toughness and resistance to stress corrosion cracking even at high tensile limits.
To guide mechanical designers and aerospace engineers, the table below consolidates the average mechanical property values of China-sourced Maraging Steel 300 across different heat treatment conditions.
| Property Parameter | Solution Annealed State | Aged / Hardened State (482°C / 900°F) |
|---|---|---|
| Ultimate Tensile Strength (UTS) | ≤ 1,000 MPa (145 ksi) | ≥ 2,050 MPa (297 ksi) |
| 0.2% Yield Strength | ≤ 750 MPa (109 ksi) | ≥ 1,930 MPa (280 ksi) |
| Elongation (A5, %) | ≥ 15% | ≥ 8% - 10% |
| Reduction of Area (ψ, %) | 60% - 75% | 35% - 50% |
| Rockwell Hardness (HRC) | 30 - 32 HRC | 50 - 55 HRC |
| Fracture Toughness (KIC) | ≥ 110 MPa·m1/2 | 38 - 50 MPa·m1/2 |
| Modulus of Elasticity | 190 GPa | 210 GPa |
The international demand for Maraging Steel 300 is driven heavily by the aerospace, defense, and high-speed electrical machinery sectors. Due to its unique combination of yield strength exceeding 1900 MPa alongside excellent fatigue resistance, the material is highly sought after for:
Combining raw material security, vertical integration, and cost-controlled precision metallurgy.
Chinese steel mills utilize double vacuum processing (VIM + VAR) to control micro-impurity and gas levels, ensuring structural homogeneity and high fatigue life under extreme conditions.
By integrating alloy smelting, thermal processing, and final precision grinding, Chinese facilities drastically lower lead times while maintaining tight metallurgical trace control.
Strict controls over elements like Cobalt (8.5% - 9.5%) and Molybdenum (4.6% - 5.2%) protect mechanical consistency, guaranteeing compliance with global standards like AMS 6514.
Your trusted national high-tech leader in advanced industrial magnetic systems and structural integration.
Established in 1999, Zhejiang Laysun Magnetics Ltd. has grown to become a national high-tech pioneer in manufacturing rare-earth magnets and magnetic integrations. High-performance mechanical assemblies—such as high-speed motor rotors—frequently combine our specialized rare-earth NdFeB magnets with structural steel containment sleeves, like Maraging Steel 300, to withstand extreme centrifugal forces.
From our state-of-the-art facility spanning 100,000 square meters in Suining, Sichuan, our team of 300 experts manufactures up to 5,000 tons of high-grade magnetic solutions annually. This massive scale ensures global industrial buyers benefit from reliable bulk supply, consistent quality metrics, and seamless integration capabilities.
Corporate Highlights:
Ensuring global industrial standards and compliance through rigorous validation.
Our core values—Quality, Credibility, Technology, and Innovation—guide every structural material and electromagnetic solution we produce. We strive to set new performance benchmarks in EV systems, high-speed rotors, and advanced aerospace tools.
Registered Standards: API 6D, API 607, CE, ISO9001, ISO14001, ISO18001, TS/IATF16949.
Market factors, sizing, processing fees, and raw material index tracking.
Procuring Maraging Steel 300 requires a solid understanding of the raw material market. Since this grade relies heavily on Cobalt (Co) and Molybdenum (Mo) for its precipitation-hardening properties, its base cost is directly tied to global metal trading indexes (such as the LME).
The following price table serves as a general guide for global procurement teams. For exact project-based quotes, please submit your chemical compliance and testing specifications.
| Material Format / Profile | Dimensions Range | Estimated Price (USD / kg) | Heat Treatment Option |
|---|---|---|---|
| Round Bars (Hot Rolled / Forged) | Dia 20mm - 250mm | $28.00 - $38.00 | Solution Annealed |
| Plates / Sheets | Thk 2.0mm - 50mm | $32.00 - $45.00 | Solution Annealed / Ground |
| Seamless Tubes | OD 50mm - 200mm | $40.00 - $55.00 | Solution Annealed |
| Cold Drawn Wire | Dia 1.0mm - 6.0mm | $45.00 - $60.00 | Aged / Spooled |
Expert answers to common engineering and sourcing questions about Grade 300 alloys.
High-grade rare-earth magnetic designs manufactured to support high-stress electric drives and rotors.
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