GCr4

Other

GCr4

High-C Cr bearing steel. (GB/T 18254; equiv GB GCr15 / AISI 52100 / DIN 100Cr6 / JIS SUJ2). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.35
SI0.15
MN0.5
CR0.35
P0.02
S0.02

Mechanical Properties

Tensile:≥680 MPa;Yield:≥490 MPa;Elong:≥15%

Chinese Standard

T 18254 GCr4

Equivalent Standards

GB GCr15 / AISI 52100 / DIN 100Cr6

Equivalent Grades

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).

Applications

高碳铬轴承钢。,"Bar

Available Forms

Wire

Uses

Tube"

Heat Treatment

Low-alloy engineering steel with enhanced hardenability and strength from alloying elements. Chromium (≈0.45%) improves hardenability, wear and corrosion resistance. Applied to gears, shafts, bolts, connecting rods, pressure parts and heavy forgings in automotive, energy and machinery sectors.

Precautions

Austenitize at 820–870 °C (oil or water quench depending on section) and temper at 400–650 °C to the required strength/toughness balance.

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