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Alloy Steel

General-purpose Cr-Mo quench & temper steel. (ASTM A194; equiv GB 42CrMo / DIN 42CrMo4 / JIS SCM440 / GB 42CrMo4). Nominal values—confirm mill certificate.

Chemical Composition (%)

C	0.38
SI	0.15
MN	0.75
CR	0.8
MO	0.15

Mechanical Properties

Tensile:≥1080 MPa;Yield:≥930 MPa;Elong:≥12%

Chinese Standard

ASTM A194 14

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

通用铬钼调质钢。,"Bar

Available Forms

Forging

Uses

Plate"

Heat Treatment

Low-alloy engineering steel with enhanced hardenability and strength from alloying elements. Chromium (≈0.95%) 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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