34CrNi3Mo

Alloy Steel

34CrNi3Mo

Specialty steel grade. Large generator rotor forging. (GB/T 2666; equiv .). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.22
CR1.5
NI3.2
MO0.3
V0.05

Mechanical Properties

Tensile:≥800 MPa;Yield:≥600 MPa

Chinese Standard

T 2666 34CrNi3Mo

Equivalent Standards

发电机转子钢。,大型发电机转子锻件。,Forging

Applications

Low-alloy engineering steel with enhanced hardenability and strength from alloying elements. Chromium (≈1.75%) improves hardenability, wear and corrosion resistance. Molybdenum (≈0.4%) raises high-temperature strength and prevents temper embrittlement. Nickel (≈3.6%) increases toughness and impact strength at low temperature. Vanadium (≈0.085%) refines grain and strengthens the tempered structure. Applied to gears, shafts, bolts, connecting rods, pressure parts and heavy forgings in automotive, energy and machinery sectors.

Available Forms

Typically normalized (880–920 °C, air cool) or carburized (900–930 °C) for case-hardening grades, then quenched and tempered at 150–200 °C.

Uses

Weldable with standard procedures; preheat may be needed for thick sections or higher-carbon/ alloy grades. Protect from decarburization during heating (controlled atmosphere or protective coating).

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