ASTM A 291 Grade 3A Class D Structural and constructional steels
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ASTM A 291 Grade 3A Class D Chemical Composition
A291/A291M: 2026 / Standard Specification for Steel Forgings, Carbon and Alloy, for Pinions, Gears and Shafts for Reduction Gears
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ASTM A 291 Grade 3A Class D Physical Properties
Temperature
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ASTM A 291 Grade 3A Class D Heat Treatments
- Heated to a suitable temperature for a sufficient length of time for austenitization and shall be suitably cooled to bring about complete transformation. Forgings may be immediately treated for mechanical properties after preliminary heat treatment or they may be preliminarily machined prior to treatment for mechanical properties.
Forging shall be reheated to a temperature above the upper critical temperature and held a sufficient length of time for complete austenitization; air cooled.
Minimum tempering temperature at 580°C (1075°F); cooled in the furnace at a max. rate of 55°C (100°F) per hour to 315°C (600°F).
If the manufacturer elects to heat treat for mechanical properties prior to machining, the forgings shall be stress relieved after machining at a temperature that is 30 - 55°C (50 - 100°F) below the last previous tempering temperature but in no case below 540°C (1000°F); cooled under uniform conditions in the furnace at a maximum rate of 55°C ⁄hour (100°F/hour) - 315°C (600°F).
ASTM A 291 Grade 3A Class D Mechanical Properties
Temperature
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ASTM A 291 Grade 3A Class D International Equivalent Materials
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Equivalence categories reflect chemical-composition and mechanical-property comparison — always verify suitability against the governing specification for your application.
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- 1Cross References
- 10Composition
- 36Mechanical Properties
- 3Physical Properties
- 1Heat Treatment
- -Metallography
- -Machinability
- -Stress-Strain
- -Formability
- -Fatigue
- -Fracture
- -Creep
- -Joints
- -Coatings
- -Dimensions
- -Tribology
- -Corrosion
- -Ageing
- -Weatherability
- -Irradiation
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