SMn443

Alloy Steel

SMn443

Mn quench & temper steel. (JIS G4105; equiv GB 50Mn2 / DIN 46Mn7). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.48
MN1.3

Mechanical Properties

Tensile:≥885 MPa;Yield:≥735 MPa

Chinese Standard

JIS G4105 SMn443

Equivalent Grades

GB 50Mn2 / DIN 46Mn7

Applications

锰调质钢。,"Bar

Available Forms

Forging"

Uses

High-carbon grade for rails, springs, cutting tools, wear plates and components demanding high hardness and wear resistance after heat treatment. Commonly supplied as bar, plate, sheet, tube and forging.

Heat Treatment

Austenitize at 760–820 °C and quench (oil/water) then temper at 150–400 °C for high hardness; spheroidize anneal (680–720 °C) improves machinability of the as-rolled bar.

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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