G-105

Alloy Steel

G-105

Specialty steel grade. ; equiv G-105 / API G-grade). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.28
SI0.15
MN0.4
CR0.8
MO0.15

Mechanical Properties

Tensile:≥560 MPa;Yield:≥460 MPa;Elong:≥21%

Equivalent Standards

G-105 / API G-grade

Applications

低合金铬钼钢，航空管材。,Pipe

Available Forms

Low-alloy engineering steel with enhanced hardenability and strength from alloying elements. Chromium (≈0.95%) improves hardenability, wear and corrosion resistance. Molybdenum (≈0.2%) raises high-temperature strength and prevents temper embrittlement. 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

API 5DP G-105

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