9310 is a premium low-carbon nickel-chromium-molybdenum carburizing alloy steel. With high nickel content and ultra-low carbon composition, it provides exceptional case hardness after carburizing while maintaining outstanding core toughness and impact resistance. It features excellent deep hardenability, superior fatigue strength, fine grain structure and stable mechanical properties at low temperatures. Widely used for heavy-duty gears, aircraft transmission parts, high-load shafts and critical

Advantage

1.Outstanding deep hardenability, ensuring uniform performance for large-section components 2.Excellent low-temperature toughness and high impact resistance under severe working conditions 3.High surface hardness and wear resistance after carburizing, combined with tough core performance 4.Superior fatigue strength and stable dimensional accuracy for long-term heavy-load service

Ingredient

• C
• 0.07 ~ 0.13
• Ni
• 3.00 ~ 3.50
• Cr
• 1.00 ~ 1.40
• Mo
• 0.08 ~ 0.15
• Mn
• 0.40 ~ 0.70
• Si
• 0.15 ~ 0.35
• P
• ≤0.015
• S
• ≤0.015
• Fe
• Balance

Standard

• USA
• ASTM A322 / AISI 9310
• China
• GB/T 3077‑2015、GB/T 4356‑2021

Mechanics

• STATE
• RP
• YIELD
• EXTEND
• SHRINK
• HARDNESS
• IMPACT
• Annealed
• ≥830 MPa
• ≥540 MPa
• ≥18 %
• ≥55 %
• ≤240 HBW
• ≥35 J
• Annealed
• ≥790 MPa
• ≥510 MPa
• ≥18 %
• ≥55 %
• ≤240 HBW
• ≥35 J

• STATE
• Annealed
• RP
• ≥830 MPa
• YIELD
• ≥540 MPa
• EXTEND
• ≥18 %
• SHRINK
• ≥55 %
• HARDNESS
• ≤240 HBW
• IMPACT
• ≥35 J
• STATE
• Annealed
• RP
• ≥790 MPa
• YIELD
• ≥510 MPa
• EXTEND
• ≥18 %
• SHRINK
• ≥55 %
• HARDNESS
• ≤240 HBW
• IMPACT
• ≥35 J