Y40Mn

Other

Y40Mn / L20409

Y40Mn grade supplied by Shanxi Youte Steel (jlhsteel.net).

Chemical Composition (%)

C	0.37
SI	0.15
MN	1.2
P	0.05
S	0.2

Available Forms

Bar, Plate, Tube, Forging

Uses

Medium-carbon grade for machine parts such as gears, crankshafts, axles, connecting rods, spindles and forgings that need a balance of strength, toughness and machinability. Commonly supplied as bar, plate, sheet, tube and forging.

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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