5147

Alloy Steel

5147

General-purpose Cr Q&T steel. (AISI; equiv GB 40Cr / DIN 41Cr4 / JIS SCr440). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.38
MN0.7
CR0.7

Mechanical Properties

Tensile:≥980 MPa;Yield:≥785 MPa

Equivalent Grades

AISI 5147 / GB 40Cr / DIN 41Cr4 / JIS SCr440

Applications

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Available Forms

Forging"

Uses

Low-alloy engineering steel with enhanced hardenability and strength from alloying elements. Chromium (≈0.8%) improves hardenability, wear and corrosion resistance. Applied to gears, shafts, bolts, connecting rods, pressure parts and heavy forgings in automotive, energy and machinery sectors.

Heat Treatment

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

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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