
Maraging Steel C250 (Vascomax 250 / C250) is an ultra-high-strength, iron-nickel martensitic steel alloy hardened by intermetallic precipitation rather than carbon. It exhibits exceptional yield strength and fracture toughness along with excellent dimensional stability during heat treatment.
Chemical Composition Data
| Element | Minimum Value | Maximum Value | Nominal / Role |
| Nickel | 18.00 | 19.00 | Matrix toughness & martensite formation |
| Cobalt | 7.00 | 8.50 | Hardening catalyst & matrix strengthener |
| Molybdenum | 4.60 | 5.20 | Intermetallic precipitate formation |
| Titanium | 0.30 | 0.50 | Primary intermetallic precipitation age hardener |
| Aluminum | 0.05 | 0.15 | Deoxidizer & age hardening additive |
| Iron | 65.00 | 70.00 | Balance base element |
| Carbon | 0.00 | 0.03 | Ultra-low limit to prevent brittleness |
| Manganese | 0.00 | 0.10 | Impurity limit |
| Silicon | 0.00 | 0.10 | Impurity limit |
| Phosphorus | 0.00 | 0.01 | Impurity limit |
| Sulfur | 0.00 | 0.01 | Impurity limit |
Material & Standard Specification Identifiers
UNS Designation: K92890
Werkstoff Number: 1.6359 / 1.6358
EN / DIN Standard Designation: X2NiCoMo18-8-5 / 18Ni-250
Common Industry Names: Maraging 250, Vascomax 250, C250, Maraging C250
AMS Specifications: AMS 6512 (Bars/Forgings), AMS 6520 (Sheet/Strip/Plate)
ASTM Specifications: A538, A579 Grade 72
MIL Specifications: MIL-S-46850
Physical & Mechanical Property Data
| Property Parameter | Metric Value | Imperial Value |
| Density | 8.00 | 0.289 |
| Melting Point Range Low | 1413 | 2575 |
| Melting Point Range High | 1427 | 2600 |
| Tensile Strength Aged | 1750 to 1850 | 254 to 268 |
| Yield Strength 0.2 Percent Offset Aged | 1650 to 1750 | 240 to 254 |
| Elongation Percentage in 50mm Aged | 6 to 12 | 6 to 12 |
| Hardness Rockwell C Aged | 48 to 52 | 48 to 52 |
| Modulus of Elasticity | 190 | 27.5 |
Scrap Recycling & Material Sorting Data
Scrap Trade Category: Maraging Steel Scrap / Cobalt-Nickel Alloy Scrap
Primary Valuation Drivers: High Cobalt content (7.00 to 8.50), Nickel content (18.00 to 19.00), and Molybdenum content (4.60 to 5.20)
XRF Analyzer Verification Windows: Ni 18.0 to 19.0, Co 7.0 to 8.5, Mo 4.6 to 5.2, Ti 0.3 to 0.5, near-zero C
Common Industrial Scrap Source Forms: Rocket motor cases, centrifuge rotors, drive shafts, missile casings, high-stress aerospace forgings, and specialized tooling components
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