ZYTC Alloy is a reliable Chinese manufacturer and global supplier of premium aerospace‑grade special steels. We provide high‑performance AMS 6514 Maraging 300 maraging steel round bars and forging billets for aerospace, motorsport, tooling and defense industries. AMS 6514 governs aircraft‑quality maraging 300 steel products including bars, forgings, mechanical tubing and flash‑welded rings up to 10.000 inches (254.00 mm) in diameter or cross‑section dimension, alongside forging stock in unrestricted sizes. Our materials comply with UNS K93120, ASTM A579, MIL‑S‑46850 and other cross‑reference specifications to satisfy strict international project requirements. |  |
 | Maraging 300 is a low‑carbon, age‑hardenable iron‑nickel maraging stainless steel celebrated for its unmatched combination of ultra‑high strength, outstanding toughness and excellent resistance to crack propagation. Unlike conventional high‑carbon tool steels, it gains mechanical strength primarily through intermetallic phase precipitation during aging treatment, instead of carbon martensite hardening. It delivers high yield and tensile strength, great ductility, superior impact performance, excellent fatigue and compressive strength, as well as good hardness and wear resistance suitable for heavy‑duty tooling applications. The alloy also features remarkable fabrication flexibility: it can be cold‑formed, warm‑worked or hot‑formed without intermediate annealing cycles. Weld performance stands out as well; reliable welding can be completed without pre‑heating or post‑heating procedures, and it supports high‑quality polishing finishes. Additional practical advantages make Maraging 300 widely favored by engineers. Its low thermal expansion coefficient effectively reduces heat checking risk under cyclic thermal loads. Pitting corrosion performance surpasses many common tool steel grades. Repair welding can be performed conveniently, and components can be re‑treated and reworked to extend service life, bringing notable cost benefits for tooling projects. |
Chemical Composition| Element | Nominal % |
|---|
| Carbon | 0.03 max | | Silicon | 0.10 max | | Manganese | 0.10 max | | Nickel | 18.50 | | Cobalt | 9.00 | | Molybdenum | 4.80 | | Titanium | 0.60 | | Aluminum | 0.10 | | Iron | Balance |
Physical Properties| Property | |
|---|
| Density, lb /in3 | .289 | | Modulus of Elasticity | 27.5 x 10-6 psi | | Average Co of Thermal Expansion | 5.6 x 10-6 in/in/°F |
Maraging 300 Machinability (Annealed)| Operation | Tool Material | Tool Geometry | Depth of cut | Width of cut | Feed | Cutting Speed | Wearland | Cutting Fluid |
|---|
| Turning | M2 or T-15 | BR: 0°; SR: 10°
SCEA: 15°; ECEA: 5°
Relief: 5°; NR: 0.030 in | 0.060 in | -- | 0.009 in/rev | 80 ft/min | 0.060 in | Soluble oil (1:20) | | Turning | C3 | BR: -5°; SR: -5°
SCEA: 15°; ECEA: 15°
Relief: 5°; NR: 0.030 in | | -- | 0.009 in/rev | 475 | 0.010 | Soluble oil (1:20) | | Face milling | M2 or M-7 | AR: 5°; RR: 5°; CA: 45°
ECEA: 10°; CI: 8° | 0.060 | 2 in | 0.005 in/tooth | 140 | 0.060 | Highly chlorinated oil | | Face milling | C2 | AR: 10°; RR: 0° CA: 45°
ECEA: 10° CI: 8° | 0.060 | 2 | 0.005 in/tooth | 330 | 0.015 | Dry | | Peripheral end milling | M2 | Helix Angle: 30°; RR: 10°
CA: 45° x 0.060 in; CI: 7° | 0.250 | 0.750 | 0.004 in/tooth | 225 | 0.012 | Soluble oil (1:20) | | End mill slotting | M2 | Helix angle: 30°; RR: 10°
CA: 45 x 0.060 in; CI: 7° | 0.250 | 0.750 | 0.002 in/tooth | 140 | 0.012 | Highly chlorinated oil | | Drilling | M1 | 118° plain point; CI: 7° | 0.500 (through hole) | -- | 0.005 in/rev | 100 | 0.015 | Highly sulfurized oil | | Reaming | M2 | Helix angle: 0°; CA: 45°
CI: 7° | 0.500 (through hole) | -- | 0.009 in/rev | 60 | 0.006 | Highly sulfurized oil | | Tapping | M1 | 2 flute plug; 75% thread | 0.500 (through hole) | -- | -- | 150 | Undersize threads | Highly sulfurized oil |
Machining data provided for informational purposes only.
Heat Treatment GuidelinesMaraging 300 contains extremely low carbon content, so protective atmosphere is not mandatory during annealing or aging cycles. Material is supplied in solution‑annealed condition at 30‑35 HRC. Standard aging cycle for general applications: hold at 900‑925 °F for 6 hours, air cool, achieving final hardness 50‑55 HRC. For large cross‑section workpieces, extend aging holding time accordingly. For die‑casting tooling service to maximize die service life, a modified thermal cycle is recommended. Rough‑machined parts shall be annealed at 1500‑1525 °F, holding one hour per inch of material thickness. After finish machining, perform aging treatment at 980‑1000 °F for 6 hours.
Available Product FormsZYTC Alloy supplies Maraging 300 in round bar and forging billet. Custom diameters, surface finishes and cutting‑to‑length services are available upon request. Please contact our sales team for stock status and custom order support. Key SpecificationsUNS K93120, ASTM A579, AMS 6514, AMS 6521, MIL‑S‑46850, MIL‑S‑13881, Werkstoff Nr.1.6358 / 1.6354 ApplicationsMaraging 300 steel serves demanding sectors covering aerospace, defense, motorsport and high‑performance tooling. Typical components include high‑strength driveshafts, heavy‑load gears, critical structural fasteners, light‑aircraft landing gear assemblies, missile structures, ejector system parts, high‑performance torsion springs, and premium injection‑molding & die‑casting tooling. If you require Maraging 300 material with full material test reports, or custom processing solutions, reach out to ZYTC Alloy for quotation and technical consultation. |  |
If you require Maraging 300 material with full material test reports, or custom processing solutions, reach out to ZYTC Alloy for quotation and technical consultation. 📧 Email: daisy@zytcsteel.com
📲 WhatsApp: +86 17335753350 |
