34CrNiMo6 Steel Bar | DIN 1.6582 Alloy Steel

34CrNiMo6 steel is defined as a low-alloy high-strength structural steel with the material number 1.6582 under DIN/EN standards.

34CrNiMo6 steel, through multi-element alloying and a quenching + tempering heat treatment process, achieves a perfect balance between high strength and excellent toughness, exhibiting superior hardenability, low-temperature impact resistance, and fatigue resistance.

34CrNiMo6 steel’s core applications cover high-end manufacturing industries such as wind power and aerospace, making it the preferred steel for various heavy-duty, impact-resistant, and safety-critical components.

34CrNiMo6 STEEL CHEMICAL COMPOSITION

Grade	C	Mn	P	S	Si	Cr	Ni	Mo
34CrNiMo6/1.6582	0.30-0.38	0.50-0.80	≤0.025	≤0.035	≤0.4	1.3-1.7	1.3-1.7	0.15-0.3

34CrNiMo6 STEEL EQUIVALENT GRADE

China	USA	British	France	Japan
40CrNiMo	4340/4337	EN24/817M40	35NCD6	SNCM439

34CrNiMo6 STEEL PHYSICAL PROPERTY

Density: 7.85 g/cm³
Elastic modulus: approx. 210GPa
Poisson’s ratio: 0.29
Thermal conductivity (20℃):approx. 42 W/(m・K)
Specific heat capacity (20℃): approx.460 J/(kg・K)
Linear expansion coefficient (20~100℃): 11.5×10⁻⁶/℃

34CrNiMo6 STEEL FORGING

The core principles of forging 34CrNiMo6 steel are: temperature control to prevent cracking, uniform deformation, slow cooling and stress relief. Due to its characteristics of high hardenability, low thermal conductivity and narrow thermoplasticity range, its forging process needs to be strictly controlled.

To prevent thermal stress cracking, 34CrNiMo6 steel should be preheated slowly and gradually to 600-700°C in a stepped manner to eliminate the temperature difference between the inside and outside of the billet.

After uniform preheating, the temperature can be rapidly increased to the initial forging temperature:1050~1100℃,while ensuring that the final forging temperature is not lower than 850°C.

During the forging process, in order to ensure a dense and uniform microstructure, the forging of 34CrNiMo6 steel should be carried out using a multi-pass, small-deformation method to avoid local stress concentration caused by large deformation.

After forging, 34CrNiMo6 steel must be cooled slowly; air cooling is absolutely prohibited!

Forging itself does not give 34CrNiMo6 steel its final high strength and toughness, but rather provides a preliminary foundation for subsequent heat treatment.

34CrNiMo6 STEEL HEAT TREATMENT

The superior performance of 34CrNiMo6 steel relies entirely on precise heat treatment. The core of this process is quenching and tempering, combined with pretreatment processes such as normalizing and annealing, ultimately achieving a perfect balance between high strength and high toughness.

34CrNiMo6 Steel Preliminary Heat Treatment

Process	Temperature	Cooling method	Process time	Final effect
Normalizing	850-880°C	Air cooling	2-3 days	Grains refined,microstructure improved
Annealing	830-850°C	Furance cooling	5-7 days	Hardness reduced,stress relieved

34CrNiMo6 Steel Final Heat Treatment：Quenching & Tempering

This is the essential and core process that gives 34CrNiMo6 its final performance.

Process	Temperature	Cooling method	Microstructure	Material property
Quenching	840-860°C	Oil cooling	Martensite	Hard and brittle
Tempering	540-650°C	Air cooling	Tempered sorbite	High strength and high toughness

34CrNiMo6+QT Steel Mechanical Property

Tensile Strength	Yield Strength	Elongation	Reduction of Area	Impact Charpy-V	Hardness
950-1100 Mpa	750-900Mpa	≥12%	≥45%	≥50J	28-34HRC

34CrNiMo6 STEEL SUPPLY FORM & SIZE & TOLERANCE

When it comes to 34CrNiMo6 steel, FUHONG stands as your premier choice. As a top-tier manufacturer based in China, we are committed to upholding excellence in both product quality and on-time delivery. Our 34CrNiMo6 steel products are designed to achieve exceptional high performance for production across a wide range of industries.

For all your 34CrNiMo6 steel requirements, don’t hesitate to get in touch with our professional team.

34CrNiMo6 steel Supplier,Stockist and Exporter,supplied with Round,Square,Flat,Block,and Shaft etc.

Hot Forged Round bar:Φ80-Φ1000mm

Hot Rolled Round bar:Φ16-Φ280mm

Hot Forged Square bar: Max Thickness:500mm

Flat bar/Blcoks:Thickness :120-800mm ,Width:120-1500mm

Surface Finish	Black-Forged	Black-Rolled	Rough Turned	Cold Drawn	Peeled	Polished	Grinded
Tolerance	0/+5mm	0/+1mm	0/+3mm	Best H11	Best H9	Best H9	Best h8

Heat treatment:Quenched and Tempered (+QT), Normalizing (+N), Annealing (+A)
Surface finish:Black / Rough turned / Peeled

RFQ 34CrNiMo6 Steel

FREQUENTLY ASKED QUESTIONS FOR 34CrNiMo6 STEEL

Is 34CrNiMo6 steel suitable for induction hardening?admin2026-01-20T20:57:19+08:00

Is 34CrNiMo6 steel suitable for induction hardening?

34CrNiMo6 steel is suitable for induction hardening processes.

For 34CrNiMo6 steel, induction hardening is typically applied after an initial quenching and tempering treatment to establish a strong and tough core structure. The subsequent localized induction hardening, followed by low-temperature tempering, produces a deep hardened case with beneficial compressive residual stresses. This combination significantly enhances wear resistance and fatigue strength, making the process a preferred surface‑strengthening method for critical heavy‑duty components such as large gears and crankshafts.

What are the differences between 34CrNiMo6 steel and 42CrMo4 steel?admin2026-01-19T11:27:33+08:00

What are the differences between 34CrNiMo6 steel and 42CrMo4 steel?

34CrNiMo6 and 42CrMo4 are both widely used high-strength alloy structural steels. Their core difference can be defined as the choice between performance and cost-effectiveness.

Grade	C	Si	Mn	Cr	Ni	Mo	P	S
42CrMo4	0.38-0.45	≤ 0.4	0.6-0.9	0.9-1.2	-	0.15-0.3	≤ 0.025	≤ 0.035
34CrNiMo6	0.30-0.38	≤ 0.4	0.5-0.8	1.3-1.7	1.3-1.7	0.15-0.3	≤ 0.025	≤ 0.035

The addition of nickel (Ni) makes 34CrNiMo6 surpass 42CrMo4 in terms of overall strength, toughness, and hardenability, but the cost also increases significantly.

How to choose?

34CrNiMo6: Maintains excellent strength and toughness even under extremely harsh conditions (large size, heavy impact, low temperature), offering the highest reliability.

42CrMo4: Capable of handling most high-load tasks, with balanced and reliable performance, and outstanding cost-effectiveness, making it an absolute “backbone” in the mechanical manufacturing field.Learn More

Is 34CrNiMo6 steel suitable for wind turbine main shafts?admin2026-01-19T09:45:33+08:00

Is 34CrNiMo6 steel suitable for wind turbine main shafts?

34CrNiMo6 steel can be used to manufacture wind turbine main shafts.

34CrNiMo6, a high-hardenability alloy structural steel, delivers excellent strength-toughness balance and fatigue resistance after quenching and tempering. It is capable of withstanding the sustained alternating loads, torsional forces and impact loads acting on wind turbine main shafts during service, meeting the operational requirements of megawatt-class wind turbines and serving as a reliable material solution for wind turbine shaft manufacturing.Learn More

Is 34CrNiMo6 steel wear-resistant?admin2026-01-19T09:11:29+08:00

Is 34CrNiMo6 steel wear-resistant?

34CrNiMo6 steel is wear-resistant, but not the most wear-resistant.

As an alloy structural steel, the wear resistance of 34CrNiMo6 mainly comes from the high hardness/high strength after quenching and tempering heat treatment, which is sufficient to meet the conventional heavy-load, low-wear requirements of components such as gears and heavy-duty shafts.

The surface hardness of 34CrNiMo6 after quenching and tempering did not reach the high wear resistance level, which could not meet the stringent wear resistance requirements of high load and high friction. Therefore, it is necessary to add a surface strengthening process (surface quenching, nitriding) to further improve its surface hardness and wear resistance performance.

How to choose between 34CrNiMo6 and 30CrNiMo8?admin2026-01-18T16:47:41+08:00

How to choose between 34CrNiMo6 and 30CrNiMo8?

Both 34CrNiMo6 and 30CrNiMo8 are high-strength alloy structural steels under the European standard system. As an upgraded version of 34CrNiMo6, the increased proportion of alloying elements in 30CrNiMo8 leads to a targeted improvement in performance:

Higher toughness: especially significantly improved low-temperature impact toughness and fracture toughness.
Stronger impact and fatigue resistance: better able to withstand sudden loads and repeated alternating stresses.
Better hardenability: enables the core of larger cross-section parts to achieve excellent mechanical properties after heat treatment.

Therefore, 34CrNiMo6, due to its excellent strength-toughness balance, is the most versatile high-strength alloy steel, fully meeting the needs of most conventional heavy-duty components. 30CrNiMo8, with its upgraded performance, is even more suitable for core components with larger cross-sections, higher loads, and extremely stringent safety and reliability requirements.Learn More

How to find a professional 34CrNiMo6 steel supplier?admin2026-01-17T11:06:28+08:00

How to find a professional 34CrNiMo6 steel supplier?

Are you looking for a professional 34CrNiMo6 steel supplier in China?Whatever your answer may be, here at FUHONG we can help.

As Chinese First-Class Manufacturer, we focus on providing quality and new solutions for your needs in 34CrNiMo6. Thanks to modern technology and our professional team, you receive appropriate 34CrNiMo6 products for your company. Don’t hesitate to contact us in case you want to know how FUHONG can help your business .Learn More