30CrMnSiE

Alloy Steel

30CrMnSiE

Specialty steel grade. ; equiv 30CrMnSiE). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.38
MN0.7
CR0.7

Mechanical Properties

Tensile:≥980 MPa;Yield:≥785 MPa

Chinese Standard

GJB 5215 30CrMnSiE

Applications

通用调质铬钢。,Bar

Available Forms

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.

Uses

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

Heat Treatment

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).

Precautions

30CrMnSiE

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