4340 HR Annealed CQ
Chemical Composition
Carbon:                 0.37%-0.43%
Nickel:                   1.65%-2.00%
Chromium:              0.70%-0.90%
Manganese:            0.60%-0.80%
Molybdenum:           0.20%-0.30%

Silicon:                   0.15%-0.30%
Sulfur:                    0.04%
Phosphorous:           0.035%
Tensile Strength:           108,000 PSI
Yield Strength:              68,200 PSI
Elongation:                   22%

*These numbers are "Typical" properties and may not be required to meet this grade. Please check with your Alro Sales Representative if physical properties are required for your application.*
Typical Uses
Typical uses for 4340 include:
  • Landing Gears
  • Power Transmission Gears
  • Shafts

4340 Hot Rolled Annealed Commercial Quality

AISI 4340 is a highly alloyed steel with high nickel and chromium content which assures deep hardening when oil quenched, with high strength characteristics throughout the section. Used for heavily stressed parts operating under strenuous conditions. This is also known as Annealed/Q&T (Annealed Quenched and Tempered).