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High Tensile Strength 34CrNiMo6 Alloy Steel Round Bar with Polished Surface for Mold Steel Applications

Minimum Order Quantity	1 Ton
Price	US $650-1,250 / Ton

Product Details

Diameter Range	6-630mm	Chemical Composition	Carbon 0.37-0.44, Silicon 0.17-0.37, Manganese 0.50-0.80, Phosphorus 0.04 Max, Sulphur 0.04 Max, Chromium 0.60-0.90, Molybdenum 0.15-0.25, Nickel 1.25-1.85
Tensile Strength	933-1011 MPa	Yield Strength	832-899 MPa
Elongation	19-20%	Hardness	274-303 HB
Reduction Of Area	53-64%	Impact Energy	117 J
Surface Treatment	Polished	Heat Treatment	Annealing, Flame/Induction Hardening, Nitriding, Stress Relieving, Tempering
Annealing Temperature	800-850°C	Hardening Temperature	830-860°C
Nitriding Temperature	490-530°C	Stress Relieving Temperature	600-650°C
Tempering Temperature	450-660°C
Highlight	High Tensile Strength Alloy Steel Round Bar , Polished Surface 34CrNiMo6 Steel Bar , Mold Steel Application DIN 1.6582 Steel Bar

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Product Description

34CrNiMo6 Alloy Steel Bar - High Tensile Nickel-Chromium-Molybdenum Steel

34CrNiMo6 (DIN 1.6582, EN 10083-3) is a premium high-hardenability alloy steel bar featuring nickel-chromium-molybdenum composition. This hot-rolled steel bar is supplied hardened and tempered in the tensile range of 930-1080 MPa, delivering exceptional strength and toughness even in large sections.

Product Specifications

Diameter Range: 10-350mm

Length: Custom cut to your requirements

Condition: Hardened and tempered (Condition U)

Material Characteristics

34CrNiMo6 is characterized by high tensile strength and superior toughness in relatively large cross-sections. The pre-hardened and tempered material can be further surface hardened through flame or induction hardening processes, as well as nitriding treatments.

Industrial Applications

Aircraft and automotive components
Propeller shafts, connecting rods, and gear shafts
Heavy forgings, rotors, and discs
Pulley shafts, gears, pins, and axles
Heavy-duty gears, spindles, studs, and bolts
Couplings, sprockets, pinions, and torsion bars
Conveyor system components

Chemical Composition

Element	Content (%)
Carbon	0.37-0.44
Silicon	0.17-0.37
Manganese	0.50-0.80
Phosphorus	0.04 max
Sulphur	0.04 max
Chromium	0.60-0.90
Molybdenum	0.15-0.25
Nickel	1.25-1.85

Mechanical Properties

Property	Value
Tensile Strength	≥933-1011 MPa
Yield Strength	≥832-899 MPa
Elongation	≥19-20%
Reduction of Area	≥53-64%
Hardness	≤274-303 HB
Impact Energy (Akv)	≥117 J
Impact Energy (J/cm²)	≥144-172 J/cm²

Manufacturing Process

Production: EAF + LF + VOD + Rolled + Heat Treatment (optional)

Testing: Ultrasonic testing according to SEP 1921-84 standards

Heat Treatment Guidelines

Annealing

Heat to 800°C - 850°C, hold until uniform temperature throughout section, and cool in furnace.

Flame or Induction Hardening

34CrNiMo6 hardened and tempered bar can achieve case hardness exceeding Rc 50. Heat rapidly to 830°C - 860°C austenitic range, then quench in oil or water. Temper between 150°C - 200°C to remove quenching stresses.

Hardening

Heat to 830°C - 860°C, maintain uniform temperature, soak for 10-15 minutes per 25mm section, then quench in oil, water, or polymer. Temper immediately while hand warm.

Nitriding

Achieves surface hardness up to Rc 60. Process at 490°C - 530°C with slow cooling. Nickel content may require longer nitriding cycles due to resistance to nitrogen diffusion.

Stress Relieving

Heat to 600°C - 650°C, maintain uniform temperature, soak for 1 hour per 25mm section, and cool in still air.

Tempering

Re-heat to 450°C - 660°C as required, maintain uniform temperature, soak for 1 hour per 25mm section, and cool in still air. Avoid tempering between 250°C - 450°C due to temper brittleness.

Note: Heat treatment parameters may vary based on workpiece size, shape, furnace type, quenching medium, and transfer facilities.

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