1.7711 40CrMoV4-6 Steel

40CrMoV4-6 Creep-Resisting Steel (EN 10269, DIN 1.7711)

Product Description

FUSHUN METAL’s 40CrMoV4-6 (1.7711) is a premium chromium-molybdenum-vanadium creep-resisting steel offering an exceptional combination of high temperature strength, excellent creep resistance, good toughness, and superior long-term durability at elevated temperatures. With a carefully engineered chemical composition featuring optimized levels of chromium (0.90-1.20%), molybdenum (0.50-0.65%), and vanadium (0.25-0.35%), our 40CrMoV4-6 delivers outstanding performance in demanding applications requiring mechanical strength at high temperatures up to 550°C. Available in multiple forms including round bars, flat bars, plates, forgings, and custom shapes, this versatile steel is ideal for applications in high-temperature fasteners, steam turbine components, pressure vessel parts, power generation equipment, and other applications where long-term performance at elevated temperatures is essential. The balanced alloy content provides excellent hardenability combined with exceptional creep rupture strength and high-temperature stability. Each product undergoes comprehensive quality control to ensure consistent properties, precise dimensions, and superior surface quality for reliable performance in critical high-temperature industrial applications.

Equivalent Steel Grades

40CrMoV4-6 (1.7711) is part of a family of creep-resisting steels with the following equivalent grades in different standards:

Standard	Designation	Comparable Grades
Europe / EN	40CrMoV4-6	30CrMoV9, 34CrMo4, 25CrMo4
Germany / DIN	1.7711 / 40CrMoV4-6	1.7707 (30CrMoV9), 1.7220 (34CrMo4)
Italy / UNI	40CrMoV4-6	38CrMoV5.2, 35CrMo4
France / AFNOR	40CrMoV4-6	35CD4, 30CD12
UK / BS	670-860	708M40, 708A37
USA / ASTM	A193 B16	A193 B7, 4140 (modified)
China / GB	40CrMoV4-6	35CrMo, 42CrMo

Chemical Composition

FUSHUN METAL’s 40CrMoV4-6 (1.7711) Steel features the following chemical composition according to EN 10269:2013 standard:

Element	Content (%)	Allowed Product Deviations
Carbon (C)	0.36-0.44%	±0.02
Silicon (Si)	0.40% max	+0.03
Manganese (Mn)	0.45-0.85%	±0.04
Phosphorus (P)	0.025% max	+0.005
Sulfur (S)	0.030% max	+0.005
Chromium (Cr)	0.90-1.20%	±0.05
Molybdenum (Mo)	0.50-0.65%	±0.03
Vanadium (V)	0.25-0.35%	±0.03
Aluminum (Al) total	0.015% max	±0.05
Iron (Fe)	Balance	–

Key Element Functions

• Carbon (0.36-0.44%): Provides optimum hardness and strength after heat treatment. The moderate carbon content ensures good toughness while enabling adequate hardness.
• Chromium (0.90-1.20%): Enhances hardenability, provides oxidation resistance at elevated temperatures, and improves creep resistance. The chromium content also contributes to good hot strength.
• Molybdenum (0.50-0.65%): Significantly improves creep resistance, high-temperature strength, and thermal stability. Molybdenum is essential for long-term performance at elevated temperatures.
• Vanadium (0.25-0.35%): Forms stable vanadium carbides that refine grain size, enhance high-temperature strength, and improve creep resistance. Vanadium also contributes to tempering resistance.
• Manganese (0.45-0.85%): Enhances hardenability and contributes to overall strength.
• Silicon (max 0.40%): Contributes to deoxidation during steelmaking and improves oxidation resistance at elevated temperatures.

Available Product Forms and Dimensions

FUSHUN METAL offers 40CrMoV4-6 (1.7711) Creep-Resisting Steel in a wide range of forms to meet diverse application requirements:

Round Bar Specifications

Diameter (mm)	Standard Length (mm)	Tolerance	Surface Condition
10 – 25	3000, 6000, Fixed or Random	h9, h10, h11, k12	Black, Peeled, Turned, Ground, Polished
26 – 100	3000, 6000, Fixed or Random	h9, h10, h11, k12	Black, Peeled, Turned, Ground, Polished
102 – 160	3000, 6000, Fixed or Random	h9, h10, h11, k12	Black, Peeled, Turned, Ground
162 – 300	2000, 3000, Fixed or Random	h10, h11, k12	Black, Peeled, Turned, Rough Ground
305 – 500	1000, 2000, Fixed or Random	h11, k12	Black, Peeled, Turned

Flat Bar Specifications

Thickness (mm)	Width (mm)	Standard Length (mm)	Tolerance	Surface Condition
5 – 15	20 – 100	3000, 6000, Fixed or Random	EN 10278, EN 10058	Hot Rolled, Cold Drawn, Ground
16 – 30	30 – 150	3000, 6000, Fixed or Random	EN 10278, EN 10058	Hot Rolled, Cold Drawn, Ground
32 – 50	40 – 200	3000, 6000, Fixed or Random	EN 10058	Hot Rolled, Cold Drawn, Ground
55 – 80	60 – 300	3000, 6000, Fixed or Random	EN 10058	Hot Rolled, Cold Drawn
85 – 120	80 – 400	3000, Fixed or Random	EN 10058	Hot Rolled
125 – 200	100 – 500	2000, 3000, Fixed or Random	EN 10058	Hot Rolled

Plate Specifications

Thickness (mm)	Width (mm)	Length (mm)	Tolerance	Surface Condition
5 – 10	Up to 2000	Up to 6000	EN 10029, ASTM A6	Hot Rolled, Pickled, Ground
12 – 25	Up to 2500	Up to 8000	EN 10029, ASTM A6	Hot Rolled, Pickled, Ground
30 – 60	Up to 2500	Up to 10000	EN 10029, ASTM A6	Hot Rolled, Pickled
65 – 100	Up to 2200	Up to 8000	EN 10029, ASTM A6	Hot Rolled
110 – 160	Up to 2000	Up to 6000	EN 10029, ASTM A6	Hot Rolled

Square Bar Specifications

Size (mm)	Standard Length (mm)	Tolerance	Surface Condition
10 x 10 – 30 x 30	3000, 6000, Fixed or Random	h11, h12, k12	Hot Rolled, Cold Drawn, Ground
35 x 35 – 80 x 80	3000, 6000, Fixed or Random	h11, h12, k12	Hot Rolled, Cold Drawn, Ground
85 x 85 – 150 x 150	3000, 6000, Fixed or Random	h12, k12	Hot Rolled, Ground
160 x 160 – 300 x 300	2000, 3000, Fixed or Random	k12, k13	Hot Rolled

Hexagonal Bar Specifications

Size (mm)	Standard Length (mm)	Tolerance	Surface Condition
10 – 30 (across flats)	3000, 6000, Fixed or Random	h11, h12	Hot Rolled, Cold Drawn, Ground
32 – 60 (across flats)	3000, 6000, Fixed or Random	h11, h12	Hot Rolled, Cold Drawn, Ground
65 – 100 (across flats)	3000, Fixed or Random	h12, k12	Hot Rolled, Cold Drawn

Special Shapes and Custom Dimensions

FUSHUN METAL also offers 40CrMoV4-6 (1.7711) in custom shapes, sizes, and pre-machined conditions to meet specific application requirements:

• Near-net shape forgings
• Pre-machined fastener blanks
• Custom profile sections
• Pre-machined turbine components
• Custom mechanical parts
• Hollow bars and tubes
• Pre-machined pressure vessel parts
• Custom forged shapes per drawing

Heat Treatment Conditions

FUSHUN METAL can supply 40CrMoV4-6 (1.7711) in various heat treatment conditions according to EN 10269:2013 standard:

Process	Temperature °C	Cooling Medium	Resulting Hardness
Hot-forming	1100-950	–	–
Normalizing (+N)	880-900	Air	–
Quenching (+Q)	900-970	Oil or polymer	–
Tempering (+T)	650-720	Air	–
Stress-relieving (+SR)	50 under the temp. of tempering	–	–
Natural state (+U)	–	–	HB max 350
Soft annealing (+A)	680-730	Air	HB max 241
Isothermal annealing (+I)	880 furnace cooling to 730, then air	–	–
Spheroidized annealed (+AC)	830 slow furnace cooling	–	HB 220
Quenching and stress-relieving	930 oil, 200 air	–	HRC ~54
Pre-heating welding	300	–	–
Stress-relieving after welding	560 furnace cooling	–	–

Critical Temperatures

AC1 (°C)	AC3 (°C)	MS (°C)	Mf (°C)
760	870	340	120

Mechanical Properties

40CrMoV4-6 (1.7711) offers excellent mechanical properties for high-temperature applications according to EN 10269:2013 standard:

Mechanical Properties at Room Temperature (Quenched and Tempered Condition)

Size Range (mm)	Tensile Strength (N/mm²)	Yield Strength Rp0.2 (N/mm²) min.	Elongation A (%) min.	Reduction of Area Z (%) min.	Impact Energy Kv2 (J) min.	Hardness (HBW) for information
≤ 100	850-1000	700	14	45	30	253-298
100 – 160	850-1000	640	14	45	25	253-298

Minimum Yield Strength at Elevated Temperatures (EN 10269:2013)

Size Range (mm)	50°C	100°C	150°C	200°C	250°C	300°C	350°C	400°C	450°C	500°C	550°C	600°C
≤ 100	687	670	647	631	608	593	577	554	523	470	400	293
100 – 160	631	612	591	577	556	542	528	507	479	429	366	268

Tempering Values (40mm Round Bar, Quenched at 925°C in Oil)

Tempering Temperature (°C)	200	250	300	350	400	450	500	550	600	650	700
Hardness (HB)	525	520	510	485	460	438	430	409	390	360	271
Hardness (HRC)	53	52.5	52	50.5	48.5	46.5	46	44	42	39	28
Tensile Strength (N/mm²)	1950	1920	1860	1780	1660	1550	1500	1430	1360	1200	900
Yield Strength (N/mm²)	1600	1600	1580	1580	1550	1480	1360	1300	1260	1050	800
Elongation A (%)	8	8	8	8	8	8.5	9	10	11	13	16
Impact Energy Kv (J)	30	30	30	30	30	32	35	40	80	100	150

Creep Properties

40CrMoV4-6 (1.7711) is specifically designed for creep resistance, offering excellent long-term performance at elevated temperatures:

Creep Rupture Strength (σR) according to EN 10269:2013

Temperature (°C)	10,000 h (N/mm²)	100,000 h (N/mm²)	200,000 h (N/mm²)
450	513	463	446
460	483	422	400
470	451	374	347
480	413	319	286
490	371	259	229
500	321	210	187
510	269	174	155
520	223	146	130
530	187	122	103
540	160	–	–

Physical Properties

40CrMoV4-6 (1.7711) offers the following physical properties that make it suitable for high-temperature applications:

Temperature-Dependent Properties

Property	Units	20°C	100°C	200°C	300°C	400°C	500°C	600°C	700°C
Thermal Expansion Coefficient (10⁻⁶·K⁻¹)	10⁻⁶·K⁻¹	–	11.1*	12.1*	12.9*	13.5*	13.9*	14.1*	14.5*
Modulus of Elasticity (longitudinal)	GPa	211	204	196	186	177	164	127	–
Modulus of Elasticity (tangential)	GPa	81	78	75	71	68	63	49	–

* Values indicate thermal expansion coefficient between 20°C and the indicated temperature

Constant Physical Properties

Property	Units	Value
Specific Heat Capacity	J/(kg·K)	460
Thermal Conductivity	W/(m·K)	33.3
Density	kg/dm³	7.85

Applications

FUSHUN METAL’s 40CrMoV4-6 (1.7711) Creep-Resisting Steel is specifically engineered for applications requiring high strength and good creep resistance at elevated temperatures:

Power Generation Applications

• Steam turbine components
• Gas turbine parts
• Turbine blades and rotors operating at moderate temperatures
• Turbine bolting
• Generator components
• Power plant fasteners
• Valve stems and bodies
• Turbine casing components

Fastener Applications

• High-temperature bolts (similar to ASTM A193 B16)
• Pressure vessel studs and nuts
• High-pressure flange bolting
• Heat exchanger fasteners
• Steam system fasteners
• Petrochemical plant bolting
• Chemical processing equipment fasteners
• Critical structural fasteners for elevated temperature service

Pressure Equipment Applications

• Pressure vessel components
• High-temperature pressure piping
• Steam headers
• Reactor vessel parts
• Heat exchanger components
• Steam chest components
• Autoclave parts
• Boiler components

Oil & Gas Applications

• Wellhead components
• Downhole tools
• Geothermal system components
• Refinery equipment parts
• High-pressure valves
• Compressor components
• Pump shafts for high-temperature service
• Drilling equipment components

Industrial Applications

• Die-casting tools requiring high-temperature strength
• Forging dies for high-temperature service
• Industrial furnace components
• Glass industry equipment
• Extrusion press components
• Rolling mill parts
• Plastic molding tools for high-temperature polymers
• Bearings for elevated temperature service

Heat Treatment Recommendations

For customers performing their own heat treatment of 40CrMoV4-6 (1.7711) steel, FUSHUN METAL recommends the following parameters based on EN 10269:2013 standard:

Normalizing

• Heat to 880-900°C (1615-1650°F)
• Hold for sufficient time to ensure thorough heating
• Cool in still air
• Purpose: To refine grain structure and improve mechanical properties

Annealing

• Soft Annealing: 680-730°C (1255-1345°F), slow cooling in air
• Isothermal Annealing: 880°C (1615°F), furnace cooling to 730°C (1345°F), then air cooling
• Spheroidized Annealing: 830°C (1525°F), slow furnace cooling
• Resulting hardness: 220-241 HB
• Purpose: To improve machinability and prepare for subsequent hardening

Hardening

• Austenitizing: 900-970°C (1650-1780°F)
• Holding time: Sufficient time for complete through-heating
• Quenching: Oil or polymer quench
• Achievable hardness after quenching: ~54 HRC
• Purpose: To achieve maximum hardness and strength

Tempering

• Temper immediately after cooling to room temperature
• Tempering temperature: 650-720°C (1200-1330°F) for optimal creep resistance
• Holding time: Minimum 2 hours
• Cooling: Air cooling
• Double tempering recommended for critical applications
• Resulting hardness: 253-298 HB (depending on tempering temperature)
• Purpose: To achieve required combination of strength, toughness, and creep resistance

Stress Relieving

• Temperature: 50°C (90°F) below the tempering temperature
• Holding time: 1-2 hours
• Cooling: Slow cooling
• Purpose: To relieve residual stresses from machining or welding operations

Welding Considerations

• Pre-heating: 300°C (570°F)
• Post-weld heat treatment: 560°C (1040°F), furnace cooling
• Use matching composition or low-hydrogen electrodes
• Purpose: To prevent cracking and ensure weld integrity

Machining Recommendations

To achieve optimal results when machining 40CrMoV4-6 (1.7711) steel, FUSHUN METAL recommends the following parameters:

Annealed Condition (220-241 HB)

Operation	Tool Material	Cutting Speed	Feed Rate	Depth of Cut	Coolant
Turning	Cemented Carbide P20-P30	120-150 m/min	0.2-0.4 mm/rev	2-5 mm	Yes
Turning	High Speed Steel	25-35 m/min	0.1-0.3 mm/rev	1-3 mm	Yes
Milling	Cemented Carbide P20-P40	100-130 m/min	0.1-0.3 mm/tooth	2-6 mm	Yes
Milling	High Speed Steel	20-30 m/min	0.05-0.2 mm/tooth	1-4 mm	Yes
Drilling	High Speed Steel	20-25 m/min	0.05-0.15 mm/rev	–	Yes
Drilling	Cemented Carbide	80-100 m/min	0.1-0.2 mm/rev	–	Yes
Threading	High Speed Steel	10-15 m/min	As required	–	Yes
Grinding	Aluminum Oxide Wheel	25-30 m/sec	–	0.005-0.05 mm	Yes

Hardened and Tempered Condition (253-298 HB)

Operation	Tool Material	Cutting Speed	Feed Rate	Depth of Cut	Coolant
Turning	Cemented Carbide P10-P20	80-110 m/min	0.15-0.3 mm/rev	1-3 mm	Yes
Turning	Ceramic Inserts	150-200 m/min	0.1-0.2 mm/rev	0.5-2 mm	Optional
Milling	Cemented Carbide P10-P20	70-100 m/min	0.08-0.2 mm/tooth	1-4 mm	Yes
Drilling	Cemented Carbide	60-80 m/min	0.08-0.15 mm/rev	–	Yes
Threading	Cemented Carbide	40-60 m/min	As required	–	Yes
Grinding	Aluminum Oxide Wheel	25-30 m/sec	–	0.005-0.02 mm	Yes

Welding Recommendations

Welding of 40CrMoV4-6 (1.7711) is possible with proper precautions:

• Preheat: 300°C (570°F) as indicated in the technical data
• Interpass Temperature: Maintain 300-350°C (570-660°F)
• Post-weld Heat Treatment: Essential – 560°C (1040°F) with furnace cooling
• Filler Materials: Matching composition or low-hydrogen electrodes
• Processes: TIG/GTAW preferred for precision, SMAW possible with proper technique
• Hydrogen Control: Use low hydrogen processes and consumables
• Joint Design: Use simple joint designs with adequate access
• Limitations: Best suited for repair welding rather than production joining
• Alternative: Consider mechanical joining methods where possible

Comparative Advantages over Other Similar Steel Grades

Understanding how 40CrMoV4-6 (1.7711) steel compares to other grades helps in selecting the optimal material for your application:

Property	40CrMoV4-6 (1.7711)	34CrMo4 (1.7220)	30CrMoV9 (1.7707)	A193 B7 (42CrMo4)	X19CrMoVNbN11-1 (1.4913)
Vanadium Content	0.25-0.35%	None	0.10-0.20%	None	0.25-0.35%
Hot Strength	Excellent	Good	Very Good	Good	Superior
Creep Resistance	Excellent	Moderate	Good	Moderate	Superior
Maximum Operating Temp.	540°C	450°C	500°C	450°C	600°C
Toughness	Very Good	Very Good	Good	Very Good	Moderate
Oxidation Resistance	Moderate	Limited	Moderate	Limited	Excellent
Machinability	Very Good	Excellent	Good	Excellent	Limited
Cost	Moderate	Low	Moderate	Low	High
Typical Applications	Fasteners, turbine components, pressure parts up to 540°C	General engineering, medium temperature applications	Pressure vessels, moderate temperature parts	Standard high-strength bolting	High-temperature applications to 600°C

Application-Specific Recommendations

FUSHUN METAL provides tailored recommendations for specific applications of 40CrMoV4-6 (1.7711) creep-resisting steel:

High-Temperature Fastener Applications

• Recommended heat treatment: Quenched and tempered to achieve 850-1000 MPa tensile strength range
• Optimal tempering temperature: 650-680°C for best combination of strength and creep resistance
• For critical fasteners, consider 100% ultrasonic inspection to detect internal flaws
• Thread rolling after heat treatment is recommended for improved fatigue properties
• Apply appropriate anti-seize compound for high-temperature service
• For steam service applications, use proper torque values accounting for thermal expansion
• Implement proper installation procedures to ensure accurate preload
• Consider periodic inspection and retorquing during maintenance cycles

Turbine Component Applications

• Recommended heat treatment: Quenched and tempered to 44-46 HRC
• For rotating parts, ensure 100% ultrasonic inspection and magnetic particle testing
• Allow for thermal expansion in component design
• Implement stress-relieving after major machining operations
• For components with complex geometries, consider double tempering for maximum dimensional stability
• Ensure surface finish requirements are met for dynamic components
• For components under cyclic loading, shot peening may be beneficial
• Implement appropriate non-destructive testing during regular maintenance cycles

Pressure Equipment Applications

• Recommended heat treatment: Quenched and tempered to 285-320 HB
• Design according to appropriate pressure vessel codes (ASME, EN, etc.)
• For welded components, ensure proper pre-heat and post-weld heat treatment
• Consider impact test requirements for low-temperature service
• For pressure-containing components, 100% ultrasonic or radiographic testing recommended
• Ensure proper allowance for corrosion and erosion in aggressive environments
• For components subjected to thermal cycling, design to minimize thermal stress
• Implement appropriate inspection intervals based on operating conditions

Industrial Tooling Applications

• Recommended heat treatment: Quenched and tempered to 42-45 HRC for balanced properties
• For hot work tools, pre-heat before use to minimize thermal shock
• Design with proper cooling channels for temperature management
• For dies and molds, ensure adequate support and backing
• Consider surface treatments like nitriding for improved wear resistance
• Implement proper preventive maintenance including regular inspection
• For complex shapes, stress relieve after rough machining
• Consider vacuum heat treatment for critical tooling to minimize distortion

Quality Assurance and Testing

Every batch of FUSHUN METAL’s 40CrMoV4-6 (1.7711) Steel undergoes rigorous testing to ensure it meets our exacting quality standards:

• Chemical Composition Analysis: Spectrographic testing to verify precise element content critical for performance, with strict adherence to the allowed product deviations specified in EN 10269:2013.
• Mechanical Property Testing: Tensile testing, hardness testing, and impact testing to verify strength, ductility, and toughness properties.
• Microstructural Examination: Metallographic analysis to verify proper structure, grain size, and inclusion content.
• Ultrasonic Testing: 100% ultrasonic inspection available to detect internal defects and ensure soundness.
• Magnetic Particle Inspection: Surface inspection to detect cracks and surface defects.
• Dimensional Verification: Precision measurement to ensure tight dimensional tolerances.
• Heat Treatment Verification: Sample testing to confirm proper response to hardening and tempering.
• Hardenability Testing: Jominy end-quench testing to verify through-hardening capability.
• Elevated Temperature Testing: Verification of high-temperature mechanical properties for critical applications.
• Cleanliness Verification: Inclusion rating to ensure premium steel quality.

Certifications Provided

• Material Test Certificates according to EN 10204 3.1
• Chemical composition analysis
• Mechanical property test results
• Dimensional inspection report
• Heat treatment certification when applicable
• Special property verifications available upon request
• Certificate of conformity to ordered specifications
• Ultrasonic testing reports when specified
• Elevated temperature property testing when specified

Why Choose FUSHUN METAL for 40CrMoV4-6 (1.7711) Steel

When you select FUSHUN METAL as your supplier for 40CrMoV4-6 (1.7711) Steel, you partner with a leading manufacturer committed to excellence:

• Creep-Resisting Steel Expertise: Specialized experience in manufacturing premium high-temperature steels with optimal properties.
• Advanced Production Facilities: State-of-the-art melting, forging, and processing equipment specifically optimized for alloy steels.
• Stringent Quality Control: Comprehensive testing and inspection protocols ensure consistent performance in demanding applications.
• Metallurgical Knowledge: In-depth understanding of heat treatment and microstructural control of creep-resisting steels.
• Supply Chain Reliability: Robust inventory management and production planning to ensure consistent availability of critical materials.
• Technical Support: Expert assistance in material selection, heat treatment guidance, and application support.
• Global Capabilities: Worldwide shipping network with experience in international documentation and compliance.
• Material Traceability: Complete documentation and batch traceability for quality assurance.
• Continuous Improvement: Ongoing research and development in steel processing and performance.
• Industry Compliance: Materials and processes that meet or exceed international standards for critical applications.
• Competitive Pricing: Excellent value combined with superior quality and service.
• Environmental Responsibility: Commitment to sustainable manufacturing practices and environmental management.

Request Information

Contact FUSHUN METAL today to discuss your 40CrMoV4-6 (1.7711) 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
• Sample requests for evaluation

FUSHUN METAL – Your trusted partner for premium creep-resisting steel solutions that deliver consistent quality, exceptional high-temperature performance, and excellent long-term creep resistance for the most demanding industrial applications.