42CrMo

Alloy Steel

42CrMo

General-purpose Cr-Mo quench & temper steel. (GB/T 3077; equiv GB 42CrMo / DIN 42CrMo4 / JIS SCM440 / GB 42CrMo4). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.38
SI0.17
MN0.5
CR0.9
MO0.15
P0.035
S0.035

Mechanical Properties

Tensile:≥1080 MPa;Yield:≥930 MPa;Elong:≥12%;RA:≥45%;Akv:≥63 J

Chinese Standard

T 3077 42CrMo

Equivalent Grades

Preheat and control interpass temperature when welding; post-weld heat treatment or stress relief is recommended to avoid hard-zone cracking. Use low-hydrogen electrodes. Protect from decarburization during heating (controlled atmosphere or protective coating).

Applications

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Available Forms

Forging

Uses

Plate"

Heat Treatment

Low-alloy engineering steel with enhanced hardenability and strength from alloying elements. Chromium (≈1.05%) improves hardenability, wear and corrosion resistance. Molybdenum (≈0.2%) raises high-temperature strength and prevents temper embrittlement. Applied to gears, shafts, bolts, connecting rods, pressure parts and heavy forgings in automotive, energy and machinery sectors.

Precautions

Austenitize at 820–870 °C (oil or water quench depending on section) and temper at 400–650 °C to the required strength/toughness balance.

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