30CrMnSiNi2A

Alloy Steel

30CrMnSiNi2A

(GB/T 3077). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.27
SI0.7
MN0.7
CR0.7
NI1.7
P0.035
S0.035

Mechanical Properties

Tensile:≥835 MPa;Yield:≥635 MPa;Elong:≥12%;RA:≥45%

Chinese Standard

T 3077 30CrMnSiNi2A

Available Forms

Bar,Plate

Uses

Low-alloy engineering steel with enhanced hardenability and strength from alloying elements. Chromium (≈0.9%) improves hardenability, wear and corrosion resistance. Nickel (≈2%) increases toughness and impact strength at low temperature. 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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