1.7225

Alloy Steel

1.7225

1.7225 supplied by Shanxi Youte Steel (jlhsteel.net).

Chemical Composition (%)

C0.32
CR1
MO0.15
MN0.6

Chinese Standard

DIN EN 10083

Equivalent Grades

42CrMo4 / AISI 4140

Available Forms

Bar, Plate, Tube, Forging, Wire

Uses

Low-alloy engineering steel with enhanced hardenability and strength from alloying elements. Chromium (≈1.15%) improves hardenability, wear and corrosion resistance. Molybdenum (≈0.225%) 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.

Heat Treatment

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

Precautions

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).

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