FE-PL75 F.1260 835M30 EN30B 30NiCrMo16-6 1.6747 Hardened Steel
FE-PL75 F.1260 835M30 EN30B 30NiCrMo16-6 DIN1.6747 Hardened Steel
826M40 (1.6747) Low Alloy Engineering Steel
Product Description
FUSHUN METAL’s 826M40 (1.6747) is a premium low-alloy engineering steel containing optimized levels of chromium, molybdenum, and nickel to deliver exceptional performance in demanding applications. With its carefully engineered chemical composition, our 826M40 steel offers an outstanding combination of high strength, excellent toughness, superior hardenability, and good corrosion resistance. This versatile steel is particularly valued in aerospace and oil and gas industries where reliability under extreme conditions is critical. Available in round and square bars, FUSHUN METAL’s 826M40 steel provides consistent quality and reliable performance for components subjected to high stress, impact loading, and potentially corrosive environments.
Material Designations and Standards
826M40 (1.6747) conforms to the following standards:
| Standard | Designation |
|---|---|
| British Standard | BS 970-1955 / 826M40 |
| Material Number | 1.6747 |
Chemical Composition
FUSHUN METAL’s 826M40 (1.6747) Steel features the following chemical composition according to BS 970 specifications:
| Element | Min. (%) | Max. (%) |
|---|---|---|
| Carbon (C) | 0.36 | 0.44 |
| Silicon (Si) | 0.10 | 0.40 |
| Manganese (Mn) | 0.45 | 0.70 |
| Phosphorus (P) | – | 0.035 |
| Sulfur (S) | – | 0.040 |
| Chromium (Cr) | 0.50 | 0.80 |
| Molybdenum (Mo) | 0.45 | 0.65 |
| Nickel (Ni) | 2.30 | 2.80 |
| Iron (Fe) | Balance | Balance |
Key Element Functions
- Carbon (0.36-0.44%): Provides excellent hardness and strength after heat treatment while maintaining good toughness.
- Nickel (2.30-2.80%): High nickel content significantly improves toughness, especially at low temperatures, and enhances hardenability.
- Chromium (0.50-0.80%): Enhances hardenability, improves wear resistance, and provides good corrosion resistance.
- Molybdenum (0.45-0.65%): Increases hardenability, prevents temper brittleness, and enhances high-temperature strength.
- Manganese (0.45-0.70%): Contributes to strength and hardenability.
- Silicon (0.10-0.40%): Acts as a deoxidizer during steelmaking and contributes to strength.
Key Benefits
FUSHUN METAL’s 826M40 (1.6747) offers several exceptional properties that make it the material of choice for demanding applications:
Good Hardenability
826M40 steel can be heat-treated to achieve high hardness and strength, which makes it useful in applications that require components to have excellent wear resistance. The alloying elements form carbides and promote martensite formation during quenching, which contributes to the steel’s hardness. This makes it ideal for components that must maintain their mechanical properties throughout their cross-section.
Impact Resistance
The product has good impact resistance due to its excellent toughness qualities, which means it can absorb impact and shock without cracking or breaking. This property makes it suitable for use in applications where durability is essential, such as in the aerospace, defence and oil and gas industries. Its ability to withstand dynamic loading and sudden impacts makes it an excellent choice for critical components.
Corrosion Resistance
The grade contains chromium and nickel, making it highly corrosion-resistant. The material is useful in applications where components may be exposed to corrosive environments, such as offshore oil and gas drilling. This resistance to corrosion extends the service life of components and reduces maintenance requirements in challenging operating conditions.
Suitability for High-Stress Applications
With its balanced alloy content, 826M40 steel delivers excellent strength and toughness, making it ideal for applications requiring resistance to high stresses, fatigue, and wear. This combination of properties ensures reliable performance in critical components where failure is not an option.
Versatility
826M40 steel can be used in various applications due to its excellent mechanical properties. It has exceptional strength properties, making it ideal for high-stress applications. Possessing the ability to withstand heavy loads and pressure makes it a preferred choice for use in components such as gears, shafts, axles, and connecting rods.
This versatile alloy is particularly valued in industries where component reliability under extreme conditions is critical:
- Aerospace Industry: Landing gear components, structural parts, fasteners, and critical mechanical systems
- Oil and Gas Sector: Downhole tools, drill collars, pump components, and offshore equipment
- Defense Applications: Vehicle components, weapon systems, and specialized equipment
- Heavy Engineering: Gears, shafts, and high-stress mechanical components
- Power Generation: Turbine components and critical fasteners
- Marine Applications: Components exposed to corrosive environments
- Automotive Racing: High-performance drivetrain components and suspension parts
Available Product Forms and Dimensions
FUSHUN METAL offers 826M40 (1.6747) Steel in the following forms:
Round Bar Specifications
| Diameter (mm) | Standard Length (mm) | Surface Condition |
|---|---|---|
| 10 – 300 | 3000, 6000, Fixed or Random | Black, Peeled, Turned, Ground, Polished |
Square Bar Specifications
| Side Length (mm) | Standard Length (mm) | Surface Condition |
|---|---|---|
| 10 – 150 | 3000, 6000, Fixed or Random | Black, Ground |
Heat Treatment
To achieve optimal mechanical properties, FUSHUN METAL recommends the following heat treatment procedures for 826M40 (1.6747) steel:
Normalizing
- Temperature: 870-900°C
- Cooling: Air
- Purpose: Refine grain structure and prepare for further heat treatment
Hardening
- Austenitizing Temperature: 830-860°C
- Quenching Medium: Oil or Polymer quench recommended for optimal properties
- Purpose: Develop optimal hardness and strength
Tempering
- Temperature: 540-680°C depending on required hardness and toughness balance
- Cooling: Air
- Purpose: Achieve desired balance of strength, hardness and toughness
- Note: Double tempering is recommended for critical applications
Stress Relieving
- Temperature: 550-650°C
- Cooling: Slow cooling in furnace
- Purpose: Reduce internal stresses resulting from machining, welding or forming
Mechanical Properties
FUSHUN METAL’s 826M40 (1.6747) offers excellent mechanical properties after proper heat treatment:
Typical Mechanical Properties in Quenched and Tempered Condition
| Property | Typical Value |
|---|---|
| Tensile Strength | 1000-1300 N/mm² |
| Yield Strength | 800-1100 N/mm² |
| Elongation | 9-13% |
| Reduction of Area | 40-50% |
| Impact Strength (Charpy V-Notch) | 40-60 J |
| Hardness | 300-400 HB |
Note: Actual mechanical properties may vary depending on section size, heat treatment parameters, and testing direction. For specific requirements, please consult with FUSHUN METAL’s technical team.
Machinability
826M40 (1.6747) can be machined using conventional methods, though its high alloy content and strength can present challenges, especially in the hardened condition. To achieve optimal results when machining this steel, FUSHUN METAL recommends the following:
Annealed Condition
| Operation | Tool Material | Cutting Speed | Feed Rate | Coolant |
|---|---|---|---|---|
| Turning | Cemented Carbide P20-P30 | 100-130 m/min | 0.2-0.4 mm/rev | Yes |
| Milling | Cemented Carbide P20-P40 | 90-120 m/min | 0.1-0.3 mm/tooth | Yes |
| Drilling | High Speed Steel | 15-25 m/min | 0.05-0.15 mm/rev | Yes |
| Grinding | Aluminum Oxide Wheel | 25-30 m/sec | – | Yes |
Hardened Condition
| Operation | Tool Material | Cutting Speed | Feed Rate | Coolant |
|---|---|---|---|---|
| Turning | Cemented Carbide P10-P20 | 60-80 m/min | 0.1-0.2 mm/rev | Yes |
| Milling | Cemented Carbide P10-P20 | 50-70 m/min | 0.05-0.15 mm/tooth | Yes |
| Drilling | Cemented Carbide | 40-60 m/min | 0.05-0.12 mm/rev | Yes |
| Grinding | Aluminum Oxide Wheel | 25-30 m/sec | – | Yes |
Machining Tips
- Use rigid machine setups and tooling to minimize deflection and vibration
- Employ modern tool coatings (TiAlN, TiCN) for improved tool life
- Maintain sharp cutting edges to prevent work hardening
- Consider stress relief after rough machining and before final machining
- For critical components, conduct finishing operations after final heat treatment
Welding
Welding of 826M40 (1.6747) is possible but requires special precautions due to its alloy content and hardenability:
Welding Recommendations
- Preheating: 200-300°C recommended to prevent cracking
- Interpass Temperature: Maintain 200-300°C during welding
- Post-weld Heat Treatment: Stress relief at 550-650°C recommended
- Filler Materials: Use low-hydrogen electrodes with matching composition
- Processes: TIG/GTAW and MMA/SMAW methods are most suitable
- Special Considerations: Control cooling rate to avoid formation of hard, brittle structures
For critical applications, it is recommended to consult with FUSHUN METAL’s technical team for specific welding procedures.
Comparative Advantages
Understanding how 826M40 (1.6747) compares to other grades helps in selecting the optimal material for your application:
| Property | 826M40 (1.6747) | 4340 (1.6511) | 300M (1.6359) |
|---|---|---|---|
| Nickel Content | 2.30-2.80% | 1.65-2.00% | 1.65-2.00% |
| Strength Level | Very High | High | Ultra High |
| Toughness | Excellent | Very Good | Good |
| Hardenability | Very Good | Good | Excellent |
| Corrosion Resistance | Good | Moderate | Moderate |
| Cost | Moderate-High | Moderate | High |
| Typical Applications | Aerospace, Oil & Gas, Defense | General Engineering, Automotive | Aerospace, High-Performance |
Applications
826M40 (1.6747) is specifically designed for demanding applications where high strength, toughness, and good corrosion resistance are required:
Aerospace Industry
- Landing gear components
- Structural fasteners
- Airframe components
- Engine mounts
- Helicopter transmission parts
Oil and Gas Industry
- Downhole tools
- Drilling equipment
- Wellhead components
- Subsea connectors
- Valve components
- High-pressure pump parts
Defense Applications
- Weapon systems components
- Armored vehicle parts
- Naval equipment
- Ordnance components
Heavy Engineering
- Heavy-duty gears
- Shafts and axles
- Connecting rods
- Highly stressed pins and fasteners
- Mechanical power transmission components
Quality Assurance
FUSHUN METAL maintains the highest quality standards for 826M40 (1.6747) Steel:
- Material Certificates: Comprehensive certification including chemical analysis and mechanical properties
- Testing: Rigorous testing including hardness, tensile, and impact testing
- Ultrasonic Examination: Available on request to ensure internal soundness
- Traceability: Full traceability from melt to finished product
- Quality Management System: ISO 9001 certified processes
Why Choose FUSHUN METAL for 826M40 (1.6747) Steel
When you select FUSHUN METAL as your supplier for 826M40 (1.6747) Steel, you partner with a leading manufacturer committed to excellence:
- Material Expertise: Specialized experience in producing high-performance alloy steels
- Consistent Quality: Rigorous process controls ensure uniform properties
- Technical Support: Expert assistance with material selection and application guidance
- Supply Reliability: Dependable stock and delivery performance
- Custom Solutions: Ability to meet specific requirements for dimensions and properties
- Competitive Pricing: Excellent value without compromising on quality
- Industry Experience: Proven track record supplying critical industries including aerospace and oil & gas
Request Information
Contact FUSHUN METAL today to discuss your 826M40 (1.6747) Steel requirements. Our technical team is ready to assist you with:
- Detailed product specifications
- Technical consultations for your specific application
- Heat treatment recommendations
- Custom dimension and processing requirements
- Pricing inquiries and delivery schedules
In the 36NiCrMo16, 35NCD16, 30NCD16, 30NiCrMo16 grades we supply:
- Round, square, hexagonal hot-rolled bars 36NiCrMo16
- Forgings 36NiCrMo16
- Drawn and peeled bars 36NiCrMo16
- Forged square and round bars 36NiCrMo16
- Forged flat bars 36NiCrMo16
List of equivalents and other determinations of 36NiCrMo16 – 1.6773 steel:
6773, 36 NICRMO 16, 35NCD14, 35 NCD 14, 35NICRMO14, 35 NICRMO 14, 34HN3M, 36HNM, 30NCD16, 30 NCD 16, E30NCD16, 35NCD16, 35 NCD 16, AIR 9160/C, 32HN3M, 30NICRMO16-6, 30 NICRMO 16-6, 1.6747, LW 6747, 6747, 36CH2N4MA, 36KH2N4MA, 36H2N4MA, 36Х2Н4МА, 34CHN3M, 34KHN3M, 34ХН3М, ASNA 3133, ASNA 3134, ASNA 3149, ASNA 3181, ASNA 3197, 1.6746, FE-PL75, FDMA, 30NCD16.
