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DIN 39NiCrMo3 1.6510 AISI 9840 Alloy Steel

Name: DIN 39NiCrMo3 1.6510 AISI 9840 Alloy Steel
Brand: Qilu
Rating: 5.0 (54 reviews)

Grade: DIN 39NiCrMo3 1.6510

Equivalent Steel: AISI 9840

39NiCrMo3/1.6510 is a widely used high-performance nickel-chromium-molybdenum alloy quenched and tempered steel. It features a medium carbon content (0.35–0.43%) and contains alloying elements such as nickel (0.70–1.00%), chromium (0.60–1.00%), and molybdenum (0.15–0.25%). After quenching and tempering, it achieves a balance of high strength, good toughness, and excellent low-temperature impact performance. It is particularly suitable for critical engineering components subjected to high loads, high impacts, and fatigue stresses, such as heavy-duty gears, drive shafts, crankshafts, and important structural fasteners.

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Model:
9840
Brand:
Qilu

Product Description

Product Overview

39NiCrMo3 (material number 1.6510) is a high‑performance nickel‑chromium‑molybdenum alloy quenched and tempered steel defined in EN 10083‑3. It offers an outstanding balance of high strength, excellent toughness, superior low‑temperature impact resistance, and good fatigue performance, making it ideal for heavily loaded, impact‑resistant, and fatigue‑critical components across heavy machinery, automotive, aerospace, energy, and engineering structures.

Equivalent Grades

Country	USA	Europe
Standard	ASTM A29	EN10083-3
Grade	9840	39NiCrMo3/1.6510

Product Features

Chemical composition

Grade	C	Si	Mn	P	S	Cr	Mo	Ni
39NiCrMo3/1.6510	0.35-0.43	0.40Max	0.50-0.80	0.025Max	0.035Max	0.60-1.00	0.15-0.25	0.70-1.00

Mechanical Properties (Quenched + Tempered, EN 10083‑3)

Size range	Tensile strength	Yield strength	Alongation	Area of reduction	Impact value At RT/J
d≤16 t≤8	980-1180Mpa	785Mpa Min	11% Min	40% Min	/
16＜d≤40 8＜t≤20	930-1130Mpa	735Mpa Min	11% Min	40% Min	35J Min
40＜d≤100 20＜t≤60	880-1080Mpa	685Mpa Min	12% Min	45% Min	40J Min
100＜d≤160 60＜t≤100	830-980Mpa	635Mpa Min	12% Min	50% Min	40J Min
160＜d≤250 100＜t≤160	740-880Mpa	540Mpa Min	13% Min	50% Min	40J Min

Test specimens are taken 12.5 mm below the heat‑treated surface per EN 10083‑1

Hardness & Hardenability

Heat Treatment	Hardness
Soft annealed (+A)	HB240Max
Quenched and tempred (+QT)	HRC28-32(Common Range)

Where the steel is ordered by using the symbols for normal (+H) or restricted (+HL, +HH) hardenability requirements, the hardenability values should apply below:

Distance in mm from quenched end
Distance		1.5	3	5	7	9	11	13	15	20	25	30	35	40	45	50
Hardness In HRC + H	max	60	60	59	58	58	57	57	56	55	52	51	49	48	46	45
Hardness In HRC + H	min	52	51	50	49	48	46	44	43	39	36	34	33	32	31	30
Hardness In HRC + HH	max	60	60	59	58	58	57	57	56	55	52	51	49	48	46	45
Hardness In HRC + HH	min	55	54	53	52	51	50	48	47	44	41	40	38	37	36	35
Hardness In HRC + HL	max	57	57	56	55	55	53	53	52	50	47	45	44	43	41	40
Hardness In HRC + HL	min	52	51	50	49	48	46	44	43	39	36	34	33	32	31	30

Scatter bands for the Rockwell - C hardness in the end quench hardenability test.

39NiCrMo3

Supply Forms, Sizes & Tolerances

Product type	Size range	Length
Hot rolled bar	Φ16-Φ300mm	6000-9000mm
Hot forged bar	Φ140-Φ800mm	3000-5800mm
Hot rolled plate/sheet	T:12-120mm; W:1500-2500mm	2000-5800mm
Hot Forged block	T: 80-800mm; W: 100-2500mm	2000-5800mm

Surface Finish & Tolerance

Surface Finish	Turned	Milled	Grinding(Best)	Polished(Best)	Peeled(Best)	Black Forged	Black Rolled
Tolerance	+0/+3mm	+0/+3mm	+0/+0.05mm	+0/+0.05mm	+0/+0.1mm	+0/+5mm	+0/+1mm
Straighness	1mm/1000mm max.					3mm/1000mm max.

To ensure optimal performance for your application, we produce 1.6510 high speed tool steel on a dedicated make-to-order basis. This approach guarantees fresh production and allows us to customize the process for your specific requirements. Tell us your needs, and let's get started.

Forging & Heat Treatment

Forging

Heating temperature: 1150–1200 °C
Cooling: Air cool after forging

Heat Treatment

1. Soft Annealing

Heat to 830–860 °C → Furnace cool

2. Normalizing

Heat to 860–900 °C → Air cool

3. Quenching + Tempering

Quench: 830–850 °C → Water or oil
Temper: 550–650 °C → Air cool
Note: Lower temps for water quenching; higher temps for oil quenching

Weldability

39NiCrMo3 has limited weldability due to medium carbon (0.35–0.43%) and high alloy content, leading to high hardenability and risk of hydrogen‑induced cold cracking.

Preheat recommended: 250–350 °C
Use low‑hydrogen electrodes
Post‑weld tempering to restore toughness and reduce residual stress

Typical Applications

39NiCrMo3 is widely used for critical components requiring high strength, toughness, and fatigue resistance:

Automotive & Heavy Vehicles

Crankshafts, connecting rods, drive shafts, heavy‑duty gears, universal joint forks

Aerospace & Defense

Aircraft landing gear parts, rotor shafts, high‑strength bolts, hinge joints

Machinery Manufacturing

Heavy‑duty spindles, turbine/compressor shafts, large pump shafts, die‑casting mold sleeves

Energy & Heavy Engineering

Wind turbine gearbox parts, oil drill pipe joints, blowout preventer components, high‑strength fasteners

FAQ

Q1: What is 39NiCrMo3 steel?

A1: 39NiCrMo3 (1.6510) is a nickel‑chromium‑molybdenum alloy quenched and tempered steel per EN 10083‑3. It delivers high strength, good toughness, excellent low‑temperature impact, and fatigue resistance for heavy‑load critical parts.

Q2: What is the equivalent grade of 1.6510?

A2: 1.6510 (39NiCrMo3) is equivalent to AISI 9840 in the US system. It is similar in performance to GB 40CrNiMo.

Q3: Is 39NiCrMo3 weldable?

A3: It has limited weldability. Preheating (250–350 °C), low‑hydrogen welding consumables, and post‑weld tempering are required to avoid cold cracking.