Maraging Steel 300
C300 • M300 • Ultra-High Strength Tool Steel • Up to 52 HRC Hardness | FUSHUN SPECIAL STEEL
Advanced Low-Carbon Tool Steel with Intermetallic Strengthening
Maraging Steel 300 manufactured by FUSHUN SPECIAL STEEL is an advanced low-carbon tool steel featuring nickel, cobalt, and molybdenum as secondary intermetallic alloying elements. This premium grade combines exceptional hardness, strength, and wear resistance with outstanding machinability and minimal heat treatment distortion.
As a leading manufacturer, FUSHUN SPECIAL STEEL produces Maraging 300 with tensile strengths up to 1786 MPa and hardness levels reaching 52 HRC, making it the preferred choice for injection molding tools, die-casting inserts, and demanding automotive applications requiring superior mechanical properties.
International Grade Designations
Primary Designations: Maraging Steel 300 • C300 • M300
International Standards: 1.6358 (DIN) • AMS6514 • MIL-S-46850 • UNS K93120
Superior Mechanical Properties and Heat Treatment Characteristics
Maraging Steel 300’s exceptional performance is achieved through low-temperature maraging treatment, resulting in ultra-high strength with minimal dimensional distortion and excellent machinability to close tolerances.
Exceptional Strength Properties
- •Tensile Strength: Up to 1786 MPa
- •Yield Strength: Up to 1717 MPa
- •Hardness: 50-52 HRC (heat-treated)
- •Temperature Retention: Up to 450°C
Manufacturing Advantages
- •Minimal Distortion: Low-temperature maraging treatment
- •Close Tolerances: Excellent machinability
- •Nitridable: Enhanced surface properties
- •High Toughness: Impact resistance at -50°C
Optimized Chemical Composition (AMS 6514 Standard)
FUSHUN SPECIAL STEEL maintains precise control over Maraging Steel 300’s chemical composition, with low carbon content and strategic Ni-Co-Mo additions providing intermetallic strengthening:
| Element | Symbol | Min (%) | Max (%) | Function |
|---|---|---|---|---|
| Carbon | C | – | 0.03 | Ultra-low for minimal carbide formation |
| Nickel | Ni | 18.00 | 19.00 | Primary intermetallic strengthening element |
| Cobalt | Co | 8.50 | 9.50 | Enhanced maraging response and strength |
| Molybdenum | Mo | 4.60 | 5.20 | Intermetallic precipitation hardening |
| Titanium | Ti | 0.50 | 0.80 | Age hardening precipitate formation |
| Aluminum | Al | 0.05 | 0.15 | Secondary strengthening and deoxidation |
| Iron | Fe | Balance | Balance | Matrix element providing base structure |
Intermetallic Strengthening Mechanism
The ultra-low carbon content combined with high nickel, cobalt, and molybdenum levels enables the formation of intermetallic precipitates during maraging treatment. This unique strengthening mechanism achieves exceptional hardness and strength without the brittleness associated with high-carbon tool steels, while maintaining excellent machinability and dimensional stability.
Comprehensive Mechanical Properties Data
FUSHUN SPECIAL STEEL provides detailed mechanical property data for Maraging Steel 300 across different heat treatment conditions, ensuring optimal performance for specific applications.
| Property | Direction | Stress-Relieved (580°C) | Heat-Treated (590°C) | Heat-Treated (480°C) |
|---|---|---|---|---|
| Tensile Strength (MPa) | Horizontal (XY) | 1543±80 | 1451±9 | 1786±68 |
| Vertical (Z) | 1439±56 | 1453±66 | 1759±99 | |
| Yield Strength (MPa) | Horizontal (XY) | 1431±104 | 1322±27 | 1712±65 |
| Vertical (Z) | 1333±64 | 1332±70 | 1717±107 | |
| Elongation (%) | Horizontal (XY) | 9±4 | 12±1 | 6±1 |
| Vertical (Z) | 7±4 | 13±1 | 6±1 | |
| Rockwell Hardness (HRC) | – | 43-46 | 50-52 | – |
Heat Treatment Advantages
Low-Temperature Maraging: The 480-590°C heat treatment range ensures minimal distortion while achieving maximum strength. The stress-relief treatment at 580°C provides excellent dimensional stability for precision machining applications, while the maraging treatments deliver ultra-high strength for demanding service conditions.
Primary Applications and Industry Uses
Maraging Steel 300 from FUSHUN SPECIAL STEEL is specifically engineered for high-performance tooling applications requiring exceptional hardness, wear resistance, and dimensional stability. The combination of ultra-high strength and excellent machinability makes it ideal for precision manufacturing applications.
Injection Molding Tools
Primary Application: Mold inserts and cores
Benefits: Minimal distortion, close tolerances
Performance: Excellent wear resistance and surface finish
Die-Casting Inserts
Applications: High-pressure die casting components
Temperature Resistance: Up to 450°C service
Durability: Superior thermal fatigue resistance
Automotive Tooling
Equipment: Stamping dies, forming tools
Strength: Ultra-high tensile strength up to 1786 MPa
Advantage: Excellent toughness at low temperatures
Precision Manufacturing
Products: Gages, fixtures, precision components
Features: Machinability to close tolerances
Treatment: Nitriding capability for enhanced surface properties
FUSHUN SPECIAL STEEL Manufacturing Excellence
As a leading manufacturer of Maraging Steel 300, FUSHUN SPECIAL STEEL provides comprehensive production capabilities for high-performance tooling applications. We welcome large volume orders and offer customized heat treatment services for specific application requirements.
Available Product Forms
Plates: 10mm – 200mm thickness
Bars: Round and flat configurations
Forgings: Custom shapes and dimensions
Condition: Annealed, stress-relieved, or heat-treated
Quality Standards
Composition Control: AMS 6514 compliance
Mechanical Testing: EN ISO 6892-1, ASTM E8
Heat Treatment: Controlled atmosphere processing
Certification: Material test certificates and traceability
Why Choose FUSHUN SPECIAL STEEL for Maraging Steel 300?
• Advanced Manufacturing: State-of-the-art melting and processing
• Heat Treatment Expertise: Optimized maraging processes
• Custom Solutions: Application-specific properties
• Technical Support: Metallurgical engineering assistance
Partner with FUSHUN SPECIAL STEEL for Maraging Steel 300 Solutions
Ready to specify Maraging Steel 300 for your high-performance tooling applications? As a leading manufacturer with advanced intermetallic alloy production capabilities, we provide competitive pricing for large volume orders and technical support for application-specific heat treatment requirements. Contact our metallurgical team for material specifications, mechanical property data, and custom manufacturing solutions.
FUSHUN SPECIAL STEEL – Your Trusted Partner for Ultra-High Strength Tool Steel Solutions
