DIN 1.6510 39NiCrMo3 36CrNiMo4 AISI 9840 Quenched and Tempered Steel

1.6510 Nickel-Chromium-Molybdenum Steel (39NiCrMo3)

Product Description

FUSHUN METAL’s 1.6510 (39NiCrMo3) is a premium nickel-chromium-molybdenum alloyed quenching and tempering steel offering an excellent combination of high strength, good toughness, and superior hardenability. With a carefully engineered chemical composition featuring optimized levels of nickel (0.70-1.00%), chromium (0.60-1.00%), and molybdenum (0.15-0.25%), our 1.6510 delivers outstanding performance in demanding applications requiring superior mechanical properties. This versatile steel provides excellent hardenability and uniform through-hardening in medium to large cross-sections, making it ideal for components subject to high mechanical stresses. Available in round bars, flat bars, and forgings, FUSHUN METAL’s 1.6510 steel provides consistent quality and reliable performance for critical engineering applications in automotive, mechanical engineering, and energy sectors.

Material Designations and Standards

1.6510 (39NiCrMo3) conforms to the following standards:

Standard	Designation
Europe / EN	1.6510 / 39NiCrMo3
Italy / UNI	39NiCrMo3
Germany / DIN	36CrNiMo4
France / AFNOR	40NCD3
UK / BS	–
Russia / GOST	39HNM
USA / AISI/SAE	9840
China / GB	–

Chemical Composition

FUSHUN METAL’s 1.6510 (39NiCrMo3) Steel features the following chemical composition according to EN 10083-3:2006 standard:

Element	Content (%)	Allowed Product Deviations
Carbon (C)	0.35 – 0.43	±0.02
Silicon (Si)	max. 0.40	+0.03
Manganese (Mn)	0.50 – 0.80	±0.04
Phosphorus (P)	max. 0.025	+0.005
Sulfur (S)	max. 0.035	+0.005
Chromium (Cr)	0.60 – 1.00	±0.05
Molybdenum (Mo)	0.15 – 0.25	±0.03
Nickel (Ni)	0.70 – 1.00	±0.05
Iron (Fe)	Balance	–

Special versions available upon request:

• Calcium (Ca) treated for improved transverse properties
• With added lead (Pb 0.15-0.35%) for improved machinability
• With enhanced sulfur content (S 0.020-0.040%) for improved machinability

Heat Treatment Parameters

FUSHUN METAL’s 1.6510 (39NiCrMo3) can be supplied with various heat treatments:

Process	Temperature (°C)	Cooling Medium / Notes
Hot-forming	1100-900	–
Normalizing	860	Air
Quenching	850	Oil or polymer
Quenching	840	Water
Tempering	550-650	Air
Stress-relieving	50° under the temperature of tempering	–
Soft annealing	700	Air cooling (HB max 240)
Isothermal annealing	820	Furnace cooling to 650, then air (HB 195-240)
Full annealing	820	Air cooling (HB max 235)
Pre-heating welding	300	–
Stress-relieving after welding	550	Furnace cooling

Critical Temperatures

AC1 (°C)	AC3 (°C)	MS (°C)	Mf (°C)
740	790	330	110

Available Product Forms and Dimensions

FUSHUN METAL offers 1.6510 (39NiCrMo3) Steel in a wide range of forms to meet diverse application requirements:

Round Bar Specifications

Diameter (mm)	Standard Length (mm)	Surface Condition
5 – 250	3000, 6000, Fixed or Random	Hot Rolled, Cold Drawn, Peeled, Ground

Flat Bar Specifications

Thickness (mm)	Width (mm)	Standard Length (mm)	Surface Condition
5 – 100	20 – 300	3000, 6000, Fixed or Random	Hot Rolled, Cold Drawn, Ground

Forged Components

Dimension (mm)	Weight Range	Surface Condition
Up to 1000	Up to 2000 kg	Black, Rough Machined, Proof Machined

Mechanical Properties

1.6510 (39NiCrMo3) offers the following mechanical properties in quenched and tempered condition according to EN 10083-3:2006:

Hot-Rolled Mechanical Properties (Quenched and Tempered Condition)

Size Range (mm)	Tensile Strength (N/mm²)	Yield Strength (N/mm²) min.	Elongation A (%) min.	Reduction of Area C (%) min.	Impact Energy Kv (J) min.	Hardness (HB)
≤ 16/8	980-1180	785	11	40	–	295-354
16/8 – 40/20	930-1130	735	11	40	35	278-339
40/20 – 100/60	880-1080	685	12	45	40	263-327
100/60 – 160/100	830-980	635	12	50	40	249-295
160/100 – 250/160	740-880	540	13	50	40	224-263

d = diameter, t = thickness

Cold-Drawn + Quenched and Tempered Properties (EN 10277-5:2008)

Size Range (mm)	Tensile Strength (N/mm²)	Yield Strength (N/mm²) min.	Elongation A (%) min.	Hardness (HB) for information
5 – 16	980-1180	735	8	295-354
16 – 40	930-1130	700	9	278-339
40 – 63	880-1080	625	10	263-327
63 – 100	880-1080	600	10	263-327

Tempering Characteristics

The following table shows the tempering values obtained at room temperature on 10mm round bars after quenching at 850°C in oil:

Tempering Temperature (°C)	200	300	400	500	550	600	650	700
Hardness (HB)	525	468	426	390	362	336	286	240
Tensile Strength (N/mm²)	1950	1700	1500	1340	1220	1100	950	800
Yield Strength (N/mm²)	1540	1490	1370	1220	1110	980	830	670
Elongation A (%)	10.4	10.7	11.0	12.5	13.8	16.0	19.0	22.0
Impact Energy Kv (J)	32	28	27	36	46	86	114	128

Hardenability

1.6510 (39NiCrMo3) features excellent hardenability, making it suitable for components requiring uniform mechanical properties throughout the cross-section.

Jominy Test Results (EN 10083-3:2006, HRC, Grain Size 5 min.)

Distance from Quenched End (mm)	1.5	3	5	7	9	11	13	15	20	25	30
Minimum HRC	52	51	50	49	48	46	44	43	39	36	34
Maximum HRC	60	60	59	58	58	57	57	56	55	52	51

Low-Temperature Impact Strength

1.6510 (39NiCrMo3) demonstrates excellent impact strength at low temperatures, as shown by the transition curve below (Lucefin experience data):

Impact values obtained on hot-rolled 100mm round, quenched and tempered (induction) with tensile strength 1002 N/mm², yield strength 879 N/mm², elongation 14.6%, reduction of area 54%:

Temperature (°C)	Impact Energy (J)	Lateral Expansion (mm)	Shear (%)
+20	85-82-79	0.94-0.91-0.93	20
0	78-76-77	0.88-0.84-0.83	20
-20	73-77-75	0.83-0.88-0.80	30
-40	68-74-74	0.78-0.77-0.81	30
-60	66-70-64	0.80-0.78-0.77	30
-80	55-50-58	0.45-0.57-0.51	40

Physical Properties

1.6510 (39NiCrMo3) offers the following physical properties:

Property	Value at 20°C
Modulus of Elasticity (longitudinal)	210 GPa
Modulus of Elasticity (tangential)	80 GPa
Thermal Expansion Coefficient	11.2 × 10⁻⁶ K⁻¹
Density	7.80 kg/dm³

Main Applications

1.6510 (39NiCrMo3) is specifically designed for applications requiring high strength combined with good toughness in medium to large cross-sections:

• Automotive Industry: Crankshafts, connecting rods, transmission shafts, steering components, axles
• Mechanical Engineering: Gears, pinions, high-stress shafts, heavy-duty bearings, couplings
• Construction Equipment: Load-bearing parts, hydraulic components, excavator parts
• Energy Sector: Power transmission components, turbine parts, generator components
• Oil and Gas: Drilling equipment components, pump parts, connectors
• Agricultural Machinery: High-stress components, power transmission parts
• Railway Industry: Critical components for rolling stock
• Industrial Equipment: Machine parts subject to high mechanical stresses

Machining Recommendations

To achieve optimal results when machining 1.6510 (39NiCrMo3) steel, FUSHUN METAL recommends the following parameters:

Annealed Condition (195-240 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
Milling	Cemented Carbide P20-P40	100-130 m/min	0.1-0.3 mm/tooth	Yes
Drilling	High Speed Steel	18-25 m/min	0.05-0.15 mm/rev	Yes

Quenched and Tempered Condition (250-350 HB)

Operation	Tool Material	Cutting Speed	Feed Rate	Coolant
Turning	Cemented Carbide P10-P20	70-90 m/min	0.1-0.3 mm/rev	Yes
Milling	Cemented Carbide P10-P20	60-80 m/min	0.05-0.2 mm/tooth	Yes
Drilling	Cemented Carbide	50-70 m/min	0.05-0.12 mm/rev	Yes

Comparative Advantages

Understanding how 1.6510 (39NiCrMo3) compares to other grades helps in selecting the optimal material for your application:

Property	1.6510 (39NiCrMo3)	1.7225 (42CrMo4)	1.6580 (30CrNiMo8)
Alloy Content	Medium (Ni-Cr-Mo)	Medium (Cr-Mo)	High (Cr-Ni-Mo)
Strength Level	High	High	Very High
Hardenability	Very Good	Good	Excellent
Toughness	Very Good	Good	Very Good
Low Temperature Impact	Excellent	Good	Very Good
Cost	Medium	Low	High
Typical Applications	Automotive parts, gears, shafts	General engineering, medium stress parts	Highly stressed components, aerospace parts

Advantages of 1.6510 (39NiCrMo3)

1.6510 (39NiCrMo3) offers several key advantages that make it an excellent choice for demanding applications:

• Excellent Balance of Properties: Combines high strength with good toughness in an economical alloy steel
• Superior Hardenability: Ensures uniform mechanical properties throughout medium-sized cross-sections
• Exceptional Low-Temperature Toughness: Maintains good impact properties down to -60°C
• Good Fatigue Resistance: Excellent performance under cyclic loading conditions
• Dimensional Stability: Minimal distortion during heat treatment
• Good Machinability: Can be supplied with enhanced machinability (lead or sulfur added versions)
• Cost-Effectiveness: Offers excellent properties at moderate cost compared to higher alloyed steels

Quality Assurance

FUSHUN METAL maintains the highest quality standards for 1.6510 (39NiCrMo3) Steel:

• Material Certificates: EN 10204/3.1 certificates provided with chemical analysis and mechanical properties
• Testing: Comprehensive testing including impact testing and mechanical property verification
• Hardenability Control: Jominy end-quench testing to verify hardenability according to EN 10083-3:2006
• Microstructure Analysis: Verification of proper microstructure and grain size (min. grain size 5)
• Non-Destructive Testing: Ultrasonic examination according to industry standards

Why Choose FUSHUN METAL for 1.6510 (39NiCrMo3) Steel

When you select FUSHUN METAL as your supplier for 1.6510 (39NiCrMo3) Steel, you partner with a leading manufacturer committed to excellence:

• Material Expertise: Specialized experience in manufacturing alloy steels for demanding applications
• Consistent Quality: State-of-the-art production facilities ensuring uniform properties
• Technical Support: Expert assistance in material selection and application guidance
• Custom Solutions: Ability to meet specific requirements for dimensions, tolerances, and mechanical properties
• Supply Chain Reliability: Dependable delivery schedules and consistent product availability
• Special Variants: Availability of enhanced machinability versions (lead or sulfur added)

Request Information

Contact FUSHUN METAL today to discuss your 1.6510 (39NiCrMo3) 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

In the 38HNM grade the company provides:

• Hot-rolled bars and flat bars 38HNM, 39NiCrMo3, 1.6510
• Forged bars and forgings 38HNM, 39NiCrMo3, 1.6510
• Drawn and peeled bars 38HNM, 39NiCrMo3, 1.6510

List of other designations and equivalents of steel:

39NICRMO4, 1.6510, 39CHNM, 39KHNM, 39ХНМ, 38NICRMO4KB, 39NICRMOS3, 39NICRMOS3HH, 39NICRMO3PB, 38 NICRMO 4 KB, F-128, A-128, NCMO4, 38NCD4, 38 NCD 4, Č.5430, Č5430.

 

We also supply :

4130 , 4130 p+x , 4140 , 4330v mod , 4340 , 4145h mod , 4317

1.8509 , 1.6523 , 1.7707 , 1.6657 , 1.6587 , 1.6582 , 1.6773

For all products, please check here: Fushun products