U68CuCrV

Alloy Steel

U68CuCrV

Rail Mn steel. (TB/T 2344; equiv TB/T 2344 U71Mn / UIC 60). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.65
SI0.15
MN0.9
P0.03
S0.03

Mechanical Properties

Tensile:≥880 MPa;Yield:≥440 MPa

Chinese Standard

TB / T 2344 U68CuCrV

Equivalent Standards

TB / T 2344 U71Mn

Applications

钢轨用锰钢。,Section

Available Forms

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.

Uses

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.

Heat Treatment

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).

Precautions

UIC 60

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