52MnCrB3

Alloy Steel

52MnCrB3

(DIN 17221). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.49
MN0.7
CR0.7
P0.035
S0.035

Mechanical Properties

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

Chinese Standard

DIN 17221 52MnCrB3

Available Forms

Bar,Plate

Uses

Spring steel with high elastic limit and fatigue strength for coils, leaf springs, clips and suspension parts. Supplied as strip, wire and bar; shot-peened after forming for longer service life.

Heat Treatment

Austenitize 830–880 °C (oil quench) and temper at 400–520 °C; stress-relieve formed springs at 230–320 °C after coiling.

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). Shot-peen after coiling to improve fatigue life; avoid sharp bends and surface defects.

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