1.5805 Nickel-Chromium Case Hardening Steel (10NiCr5-4)
Product Description
FUSHUN METAL’s 1.5805 (10NiCr5-4) is a premium nickel-chromium alloyed case hardening steel offering an excellent combination of surface hardness and core toughness. With a carefully engineered chemical composition featuring optimized levels of nickel (1.2-1.5%) and chromium (0.9-1.2%), our 1.5805 delivers outstanding performance in applications requiring a wear-resistant surface with a tough, ductile core. This specialized alloy steel achieves a high surface hardness through carburizing while maintaining excellent core properties, including good fatigue strength and toughness. Available in round bars and wire forms suitable for cold heading and cold extrusion, FUSHUN METAL’s 1.5805 steel provides consistent quality and reliable performance for critical components in automotive, mechanical engineering, and precision machinery applications.
Material Designations and Standards
1.5805 (10NiCr5-4) conforms to the following standards:
| Standard | Designation |
|---|---|
| Material Number | 1.5805 |
| EN | 10NiCr5-4 |
| European Standard | EN 10084: 2008 Case hardening steels. Technical delivery conditions |
| European Standard | EN 10263-3: 2001 Steel rod, bars and wire for cold heading and cold extrusion. Technical delivery conditions for case hardening steels |
| AFNOR (France) | 10NC6 |
Classification
1.5805 (10NiCr5-4) is classified as an Alloy Special Steel designed specifically for case hardening applications where both surface wear resistance and core toughness are required.
Chemical Composition
FUSHUN METAL’s 1.5805 (10NiCr5-4) Steel features the following chemical composition according to EN 10084:2008 standard:
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.07 – 0.12 |
| Silicon (Si) | max. 0.4 |
| Manganese (Mn) | 0.5 – 0.9 |
| Nickel (Ni) | 1.2 – 1.5 |
| Phosphorus (P) | max. 0.025 |
| Sulfur (S) | max. 0.035 |
| Chromium (Cr) | 0.9 – 1.2 |
| Iron (Fe) | Balance |
Note: Steels with improved machinability as a result of the addition of lead or higher sulfur contents, depending on the manufacturing process up to around 0.1% S, may be supplied on request. In this case, the upper limit of the manganese content may be increased by 0.15%.
Key Element Functions
- Carbon (0.07-0.12%): Low carbon content in the base material allows for effective carburizing while maintaining a tough core.
- Nickel (1.2-1.5%): Improves core toughness, enhances hardenability, and provides better resistance to fatigue and impact.
- Chromium (0.9-1.2%): Increases hardenability, improves wear resistance, and forms carbides that enhance surface hardness after carburizing.
- Manganese (0.5-0.9%): Contributes to hardenability and strength.
- Silicon (max 0.4%): Acts as a deoxidizer during steelmaking and contributes to strength.
Mechanical Properties
1.5805 (10NiCr5-4) offers the following mechanical properties in the soft annealed condition:
| Property | Value |
|---|---|
| Tensile Strength (Rm) | 500-640 MPa |
| Reduction in Cross Section on Fracture (Z) | 59-64% |
| Brinell Hardness (HBW) – Annealed (+A) | 192 max |
| Brinell Hardness (HBW) – Treated (+TH) | 147-197 |
| Brinell Hardness (HBW) – Cold Formed (+FP) | 137-187 |
After Case Hardening (Typical Values)
After proper case hardening, 1.5805 (10NiCr5-4) typically achieves:
| Property | Value |
|---|---|
| Surface Hardness | 58-62 HRC |
| Case Depth | Adjustable according to requirements (typically 0.5-2.0 mm) |
| Core Hardness | 28-38 HRC |
| Core Tensile Strength | 800-1100 MPa |
Available Product Forms and Dimensions
FUSHUN METAL offers 1.5805 (10NiCr5-4) Steel in a wide range of forms to meet diverse application requirements:
Round Bar Specifications
| Diameter (mm) | Standard Length (mm) | Surface Condition |
|---|---|---|
| 5 – 100 | 3000, 6000, Fixed or Random | Peeled, Drawn, Ground, Polished |
Wire Specifications
| Diameter (mm) | Coil Weight (kg) | Surface Condition |
|---|---|---|
| 0.5 – 20 | 100 – 1000 | Drawn, Polished |
Custom Forms
FUSHUN METAL also offers 1.5805 (10NiCr5-4) in custom profiles and semi-finished components according to customer specifications, including cold-headed, extruded, and pre-machined parts.
Heat Treatment
To achieve optimal properties, FUSHUN METAL recommends the following heat treatment procedures for 1.5805 (10NiCr5-4) steel:
Soft Annealing
- Temperature: 680-720°C
- Holding Time: 1-2 hours per 25 mm thickness
- Cooling: Slow furnace cooling
- Resulting Hardness: Max 192 HBW
Stress Relieving
- Temperature: 550-650°C
- Holding Time: 1-2 hours
- Cooling: Slow in furnace or air
- Purpose: To reduce internal stresses after machining
Case Hardening (Carburizing)
- Carburizing Temperature: 880-930°C
- Carburizing Time: Dependent on required case depth
- Carbon Potential: 0.8-1.0%
- Hardening Temperature: 820-860°C
- Quenching Medium: Oil
- Tempering Temperature: 150-200°C for maximum surface hardness or 180-220°C for improved toughness
Direct Hardening (Alternative for small parts)
- Austenitizing Temperature: 840-880°C
- Quenching Medium: Oil
- Tempering Temperature: 150-650°C depending on required hardness
Properties After Case Hardening
When properly case hardened, 1.5805 (10NiCr5-4) exhibits an excellent combination of properties:
Surface Properties
- High hardness (58-62 HRC) for excellent wear resistance
- Good contact fatigue strength
- Excellent resistance to surface indentation
- Good tribological properties
Core Properties
- Good toughness due to nickel content
- Enhanced fatigue strength
- Good impact resistance
- Balanced ductility and strength
Applications
Due to its excellent combination of surface hardness and core toughness after case hardening, 1.5805 (10NiCr5-4) is ideal for:
Automotive Industry
- Gears and transmission components
- Pinions and sprockets
- Camshafts
- Bearing races
- Drive shafts
- Fasteners and pins
Mechanical Engineering
- Machine tool components
- Precision mechanical parts
- Couplings
- Bushings
- Guide components
Cold Forming Applications
- Cold headed parts
- Cold extruded components
- Fasteners requiring subsequent heat treatment
- Complex-shaped components produced by cold forming
General Engineering
- Components requiring good wear resistance with tough core
- Parts subjected to surface pressure and sliding wear
- Components requiring good fatigue properties
Machinability
1.5805 (10NiCr5-4) offers good machinability in the annealed condition. For improved machinability, versions with controlled sulfur content or lead additions can be supplied upon request.
Machining Parameters in Annealed Condition
| Operation | Tool Material | Cutting Speed | Feed Rate | Coolant |
|---|---|---|---|---|
| Turning | Cemented Carbide P20-P30 | 110-150 m/min | 0.2-0.4 mm/rev | Yes |
| Drilling | HSS | 20-30 m/min | 0.1-0.3 mm/rev | Yes |
| Milling | Cemented Carbide P20-P40 | 100-140 m/min | 0.1-0.3 mm/tooth | Yes |
Note: Machining should typically be performed before case hardening. After case hardening, only grinding and finishing operations are recommended.
Forming and Processing
1.5805 (10NiCr5-4) is well-suited for various forming and processing operations:
Cold Heading and Cold Extrusion
The steel has been specifically designed for cold heading and cold extrusion applications according to EN 10263-3:2001. It offers:
- Good cold formability in the soft annealed condition
- Excellent surface quality after forming
- Uniform flow during deformation
- Good dimensional stability during subsequent heat treatment
Hot Working
- Forging Temperature Range: 1150-850°C
- Start Forging: 1150°C
- End Forging: 850°C
- Post-Forging: Slow cooling in furnace or insulating material recommended
Cold Working
In the soft annealed condition, 1.5805 can be cold worked by various methods including:
- Cold heading
- Cold extrusion
- Cold drawing
- Cold rolling
- Bending and forming
Welding
1.5805 (10NiCr5-4) can be welded using conventional methods, although some precautions should be taken:
- Preheat: 150-250°C recommended for thicker sections
- Post-Weld Heat Treatment: Stress relieving at 550-650°C recommended
- Note: Welding should typically be performed before case hardening
- Filler Material: Use matching low-alloy filler or consult FUSHUN METAL for specific recommendations
For components that will be case hardened after welding, special attention must be paid to the weld quality and post-weld heat treatment to ensure uniform carburization.
Comparative Advantages
1.5805 (10NiCr5-4) offers several advantages compared to other case hardening steels:
| Property | 1.5805 (10NiCr5-4) | 1.7131 (16MnCr5) | 1.5919 (15CrNi6) |
|---|---|---|---|
| Nickel Content | 1.2-1.5% | None | 1.4-1.7% |
| Core Toughness | Excellent | Good | Very Good |
| Hardenability | Very Good | Moderate | Good |
| Case Hardness | Excellent | Good | Very Good |
| Distortion During Hardening | Low | Moderate | Low |
| Cost | Medium-High | Low | Medium |
| Cold Formability | Very Good | Good | Good |
| Best For | Critical components requiring high toughness | General purpose case hardening | Components requiring good core properties |
Quality Assurance
FUSHUN METAL maintains the highest quality standards for 1.5805 (10NiCr5-4) Steel:
- Material Certificates: EN 10204/3.1 certificates provided with chemical analysis and mechanical properties
- Testing: Comprehensive testing including hardness, tensile, and metallographic examination
- Hardenability Testing: Available upon request
- Non-Destructive Testing: Ultrasonic examination available for critical applications
- Surface Quality: Guaranteed surface condition according to application requirements
- Dimensional Tolerance: Close tolerances maintained for precision applications
Why Choose FUSHUN METAL for 1.5805 (10NiCr5-4) Steel
When you select FUSHUN METAL as your supplier for 1.5805 (10NiCr5-4) Steel, you partner with a leading manufacturer committed to excellence:
- Material Expertise: Specialized experience in producing case hardening steels for demanding applications
- Process Consistency: Rigorous control of chemical composition and processing parameters
- Cold Forming Knowledge: Deep understanding of cold heading and extrusion requirements
- Technical Support: Expert assistance in material selection, heat treatment, and application guidance
- Custom Solutions: Ability to meet specific requirements for dimensions, surface conditions, and properties
- Supply Reliability: Dependable delivery and consistent quality
- Heat Treatment Services: Optional heat treatment services including case hardening
Request Information
Contact FUSHUN METAL today to discuss your 1.5805 (10NiCr5-4) Steel requirements. Our technical team is ready to assist you with:
- Detailed product specifications
- Technical consultations for your specific application
- Heat treatment recommendations
- Cold forming and machining guidelines
- Custom dimension and processing requirements
- Pricing inquiries and delivery schedules
