28Cr3SiNiMoWVA

Alloy Steel

28Cr3SiNiMoWVA

Chinese GB ultra-high-strength steel for aircraft.

Chemical Composition (%)

C0.25
SI0.9
MN0.6
CR2.8
NI0.6
MO0.4
W0.4
V0.08
P0.025
S0.025

Applications

High-end / niche grade used in aerospace, defense, tooling, bearing, gear or heavy shaft applications.

Available Forms

Bar, plate, sheet, tube, forgings, strip, wire, powder

Uses

Low-alloy engineering steel with enhanced hardenability and strength from alloying elements. Chromium (≈3%) improves hardenability, wear and corrosion resistance. Molybdenum (≈0.5%) raises high-temperature strength and prevents temper embrittlement. Nickel (≈0.75%) increases toughness and impact strength at low temperature. Vanadium (≈0.115%) refines grain and strengthens the tempered structure. 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

Weldable with standard procedures; preheat may be needed for thick sections or higher-carbon/ alloy grades. Protect from decarburization during heating (controlled atmosphere or protective coating).

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