1.7228 708M50 50CrMo4 Quenched Tempered Alloy Steel
1.7228 Chromium-Molybdenum Alloy Steel (50CrMo4)
Product Description
FUSHUN METAL’s 1.7228 (50CrMo4) is a premium chromium-molybdenum alloyed tempering steel offering an exceptional combination of high strength, good hardenability, and excellent mechanical properties. With a carefully engineered chemical composition featuring optimized levels of carbon (0.46-0.54%), chromium (0.90-1.20%), and molybdenum (0.15-0.30%), our 1.7228 delivers outstanding performance in demanding applications requiring superior mechanical strength and wear resistance. This versatile steel is specifically developed for through-hardening components in the automotive industry and general mechanical engineering. Available in multiple forms including round bars, flat bars, and custom shapes, FUSHUN METAL’s 1.7228 steel provides consistent quality and reliable performance for critical engineering applications.
Material Designations and Standards
1.7228 (50CrMo4) conforms to the following standards:
| Standard | Designation |
|---|---|
| EN 10083-3 | 1.7228 / 50CrMo4 |
| DIN 17200 | 1.7228 / 50CrMo4 |
| ISO 683-1 | 50CrMo4 |
| AISI/SAE | 4147, 4147H, 4150, 4150H |
| BS | 708M50 |
| JIS | SCM445, SCM445H |
Chemical Composition
FUSHUN METAL’s 1.7228 (50CrMo4) Steel features the following chemical composition according to standard specifications:
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.46 – 0.54 |
| Silicon (Si) | max. 0.40 |
| Manganese (Mn) | 0.50 – 0.80 |
| Chromium (Cr) | 0.90 – 1.20 |
| Molybdenum (Mo) | 0.15 – 0.30 |
| Iron (Fe) | Balance |
Key Element Functions
- Carbon (0.46-0.54%): Provides high hardness and strength after heat treatment.
- Chromium (0.90-1.20%): Enhances hardenability, improves wear resistance, and contributes to overall strength.
- Molybdenum (0.15-0.30%): Improves hardenability, prevents temper brittleness, and enhances high-temperature strength.
- Manganese (0.50-0.80%): Increases hardenability and contributes to strength.
- Silicon (max 0.40%): Acts as a deoxidizer during steelmaking and contributes to strength.
Main Applications
The tempering steel 50CrMo4 is used for through-hardening components in automotive engineering and general mechanical engineering applications where high strength and durability are required:
- Heavy-duty automotive components
- Transmission parts
- Highly stressed machine parts
- Crankshafts and drive shafts
- Gears and pinions
- Connecting rods
- High-strength fasteners
- Heavy equipment components
- Oil and gas industry components
- Industrial machinery parts
Available Product Forms and Dimensions
FUSHUN METAL offers 1.7228 (50CrMo4) Alloy Steel in a wide range of forms to meet diverse application requirements:
Round Bar Specifications
| Diameter (mm) | Standard Length (mm) | Tolerance | Surface Condition |
|---|---|---|---|
| 8 – 16 | 3000, 6000, Fixed or Random | h9, h10, h11 | Black, Peeled, Turned, Ground, Polished |
| 17 – 40 | 3000, 6000, Fixed or Random | h9, h10, h11 | Black, Peeled, Turned, Ground, Polished |
| 41 – 100 | 3000, 6000, Fixed or Random | h9, h10, h11 | Black, Peeled, Turned, Ground |
| 101 – 160 | 3000, 6000, Fixed or Random | h10, h11 | Black, Peeled, Turned, Ground |
| 161 – 250 | 3000, Fixed or Random | h11 | Black, Peeled, Turned |
Flat Bar Specifications
| Thickness (mm) | Width (mm) | Standard Length (mm) | Surface Condition |
|---|---|---|---|
| 5 – 15 | 20 – 100 | 3000, 6000, Fixed or Random | Hot Rolled, Cold Drawn, Ground |
| 16 – 30 | 30 – 150 | 3000, 6000, Fixed or Random | Hot Rolled, Cold Drawn, Ground |
| 31 – 60 | 40 – 200 | 3000, 6000, Fixed or Random | Hot Rolled, Cold Drawn, Ground |
| 61 – 100 | 60 – 300 | 3000, 6000, Fixed or Random | Hot Rolled |
Square Bar and Special Profiles
FUSHUN METAL also offers 1.7228 (50CrMo4) in square bars and special profiles according to customer specifications and drawing requirements.
Technical Delivery Condition
FUSHUN METAL supplies 1.7228 (50CrMo4) in the following conditions:
- Quenched and Tempered: 800 – 1250 MPa
- Annealed (Soft): Max. 248 HB
Weldability
50CrMo4 is not weldable and should therefore not be used in welded constructions.
Hot Forming
50CrMo4 is hot formed at temperatures between 1100°C and 850°C and should be cooled slowly afterward.
Physical Properties
1.7228 (50CrMo4) offers the following physical properties:
| Property | Value |
|---|---|
| Density | 7.69 kg/dm³ |
| Modulus of Elasticity | 210 × 10³ MPa |
| Electrical Resistance at 20°C | 0.19 Ω mm²/m |
| Thermal Conductivity at 20°C | 42.6 W/m·K |
| Specific Heat Capacity at 20°C | 470 J/kg·K |
Thermal Expansion Coefficient in Annealed Condition (10⁻⁶ K⁻¹)
| Temperature Range | Coefficient (10⁻⁶ K⁻¹) |
|---|---|
| 20 – 100°C | 11.1 |
| 20 – 200°C | 12.1 |
| 20 – 300°C | 12.9 |
| 20 – 400°C | 13.5 |
Mechanical Properties
1.7228 (50CrMo4) offers the following mechanical properties in quenched and tempered condition at room temperature:
| Diameter (mm) | ≤ 16 | > 16 ≤ 40 | > 40 ≤ 100 |
|---|---|---|---|
| Yield Strength (MPa) | 900 | 780 | 700 |
| Tensile Strength (MPa) | 1100 – 1300 | 1000 – 1200 | 900 – 1100 |
| Elongation (L₀ = 5d₀) (%) | 9 | 10 | 12 |
| Reduction of Area (%) | 40 | 45 | 50 |
| Impact Energy ISO-V (J) | – | 30 | 30 |
| Diameter (mm) | > 100 ≤ 160 | > 160 ≤ 250 |
|---|---|---|
| Yield Strength (MPa) | 650 | 550 |
| Tensile Strength (MPa) | 850 – 1000 | 800 – 950 |
| Elongation (L₀ = 5d₀) (%) | 13 | 13 |
| Reduction of Area (%) | 50 | 50 |
| Impact Energy ISO-V (J) | 30 | 30 |
Note: These typical values apply to longitudinal specimens, which are taken from the core for diameters up to 25 mm, and from the edge zone with a distance of 12.5 mm from the edge for diameters over 25 mm. Different requirements can be considered upon request.
Heat Treatment Guidelines
Critical Temperatures: Ms: 300°C | AC1: 745°C | AC3: 775°C
Normalizing
- Normalizing should be carried out at temperatures between 840°C and 880°C followed by air cooling.
Soft Annealing
- Annealing is performed at temperatures of 680°C – 720°C followed by slow cooling.
Quenching and Tempering
- Hardening takes place at temperatures of 820°C – 850°C followed by water quenching, or
- Hardening at temperatures of 830°C – 860°C followed by quenching in oil or aqueous polymer solution with comparable quenching effect.
- Tempering should be carried out at temperatures of 540°C – 680°C followed by air cooling.
Machining Recommendations
To achieve optimal results when machining 1.7228 (50CrMo4) steel, FUSHUN METAL recommends the following parameters:
Annealed Condition (≤ 248 HB)
| Operation | Tool Material | Cutting Speed | Feed Rate | Coolant |
|---|---|---|---|---|
| Turning | Cemented Carbide P20-P30 | 110-140 m/min | 0.2-0.4 mm/rev | Yes |
| Turning | High Speed Steel | 20-30 m/min | 0.1-0.3 mm/rev | Yes |
| Milling | Cemented Carbide P20-P40 | 100-130 m/min | 0.1-0.3 mm/tooth | Yes |
| Drilling | High Speed Steel | 18-22 m/min | 0.05-0.15 mm/rev | Yes |
| Grinding | Aluminum Oxide Wheel | 25-30 m/sec | – | Yes |
Quenched and Tempered Condition
| Operation | Tool Material | Cutting Speed | Feed Rate | Coolant |
|---|---|---|---|---|
| Turning | Cemented Carbide P10-P20 | 70-90 m/min | 0.1-0.2 mm/rev | Yes |
| Milling | Cemented Carbide P10-P20 | 60-80 m/min | 0.05-0.15 mm/tooth | Yes |
| Drilling | Cemented Carbide | 50-70 m/min | 0.05-0.12 mm/rev | Yes |
| Grinding | Aluminum Oxide Wheel | 25-30 m/sec | – | Yes |
Tempering Diagram and Hardenability Band
50CrMo4 has a defined hardenability band according to the standard specifications:
- Hardening temperature: 850°C
- Quenching cross-section: Ø 60 mm
- Samples conventionally hardened in high-performance oil
Note: Detailed tempering diagram and hardenability band curves are available upon request.
Comparative Advantages
Understanding how 1.7228 (50CrMo4) compares to other grades helps in selecting the optimal material for your application:
| Property | 1.7228 (50CrMo4) | 1.7225 (42CrMo4) | 1.7218 (25CrMo4) |
|---|---|---|---|
| Carbon Content | 0.46-0.54% | 0.38-0.45% | 0.22-0.29% |
| Strength Level | Very High | High | Medium |
| Hardenability | Excellent | Very Good | Good |
| Toughness | Good | Very Good | Excellent |
| Machinability | Good | Very Good | Excellent |
| Weldability | Not Weldable | Limited | Good |
| Typical Applications | Highly stressed components, automotive parts | General engineering, shafts, gears | Welded components, structural parts |
Quality Assurance
FUSHUN METAL maintains the highest quality standards for 1.7228 (50CrMo4) Steel:
- Material Certificates: EN 10204/3.1 certificates provided with chemical analysis and mechanical properties
- Testing: Comprehensive testing including ultrasonic testing and mechanical property verification
- Quality Management: ISO 9001 certified production processes
- Traceability: Full traceability from raw material to finished product
Why Choose FUSHUN METAL for 1.7228 (50CrMo4) Steel
When you select FUSHUN METAL as your supplier for 1.7228 (50CrMo4) Steel, you partner with a leading manufacturer committed to excellence:
- Material Expertise: Specialized experience in manufacturing high-strength engineering steels
- Advanced Production: State-of-the-art production facilities ensuring consistent quality
- Consistent Quality: Stringent quality control with comprehensive testing
- Technical Support: Expert assistance in material selection and application guidance
- Custom Solutions: Ability to meet specific requirements for dimensions, tolerances, and mechanical properties
- Reliable Delivery: Efficient logistics and supply chain management
Request Information
Contact FUSHUN METAL today to discuss your 1.7228 (50CrMo4) Steel requirements. Our technical team is ready to assist you with:
- Detailed product specifications
- Technical consultations for your specific application
- Heat treatment recommendations for optimal properties
- Custom dimension and processing requirements
- Pricing inquiries and delivery schedules
