High-strength, tough alloy steel for extremely stressed components

Steel grade 1.6582 (34CrNiMo6, ČSN 15 346) is one of the highest-performance alloy quenched and tempered steels. It is characterized by exceptionally high strength, toughness, excellent hardenability even in large diameters, and very good resistance to fatigue stress.

It is ideal for the most heavily loaded machine parts, shafts, rotors, transmission components, and parts that must operate reliably under high impact and dynamic loads.

Properties of steel 1.6582 (34CrNiMo6)

🔩 Extremely high strength after quenching and tempering
The tensile strength Rm can reach 1200–1500 MPa, which places this steel among the strongest engineering steels.

⚙️ Excellent hardenability even in large diameters
Thanks to the combination of Cr + Ni + Mo, the steel hardens uniformly and is therefore suitable for large, heavy components.

🔧 Very good machinability in the annealed condition
In delivery condition +A or +N, machining is stable and precise.

🛠️ Extremely high fatigue resistance
Highly suitable for both high-cycle and low-cycle loading – used in the energy sector, automotive industry, and aerospace.

🔥 Possibility of surface hardening
An induction-hardened surface can achieve a hardness of 58–62 HRC.

Chemical composition 1.6582 (34CrNiMo6)

Element	Content (%)
C	0.30 – 0.38
Cr	1.30 – 1.70
Ni	1.30 – 1.70
Mo	0.15 – 0.30
Mn	0.50 – 0.90
Si	0.10 – 0.40
P	≤ 0.025
S	≤ 0.035

Typical applications of steel 1.6582

⚙️ Extremely stressed shafts and transmission components
main shafts

gear and transmission wheels

pinions, hubs

precision rotating parts

🏭 Energy and heavy engineering industries
rotors, spindles

pressure-loaded pins and tie rods

spring-loaded and impact-stressed components

✈️ Aerospace and transport industries
highly loaded engine and transmission parts

safety-critical components with increased performance requirements

🚛 Automotive – heavy duty
axle components

dynamically loaded joints and bolts

Heat treatment (guideline values)

Process	Temperature	Note
Quenching and tempering	830 – 870 °C hardening → 540 – 650 °C tempering	strength + toughness
Hardening	830 – 870 °C	oil quenching
Tempering	540 – 650 °C	depending on the required strength
Induction hardening	800 – 860 °C	surface 58–62 HRC
Soft annealing	650 – 700 °C	for improved machinability

Mechanical properties

Tensile strength Rm: 1200–1500 MPa (after quenching and tempering)

Yield strength Re: 900–1100 MPa

Core hardness: 250–350 HB, depending on condition

Surface hardness after induction hardening: 58–62 HRC

Elongation A: 10–13 %