SCr450

Alloy Steel

SCr450

Cr quench & temper steel. (JIS G4105; equiv GB 50Cr / DIN 50Cr4). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.48
MN0.7
CR0.8

Mechanical Properties

Tensile:≥980 MPa;Yield:≥785 MPa

Chinese Standard

JIS G4105 SCr450

Equivalent Grades

GB 50Cr / DIN 50Cr4

Applications

铬调质钢。,"Bar

Available Forms

Forging"

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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