51B60

Alloy Steel

51B60

(AISI/SAE custom). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.48
P0.035
S0.035

Mechanical Properties

Tensile:≥980 MPa;Yield:≥785 MPa;Elong:≥9%;RA:≥45%

Equivalent Grades

SAE custom 51B60

Available Forms

Bar,Plate

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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