4340 Steel

What does 4340 stand for?
Limitations of 4340 steel
How to overcome the limitations in manufacturing?
Any competetive material?

1. Name:Chandraneel Pal Rollno:1802233 Topic:4340 Steel Submitted to: Profssor e Dinesh Kumar Rathore

2. Application & Composition of 4340 Steel Composition Content% Iron 95.71 Nickel 1.83 Chromium 0.81 Manganese 0.70 Carbon 0.40 Molybdenum 0.25 Silicon 0.23 Sulphur 0.04 Phosphorus 0.03 Landing gear of aircarfts Imagesource: https://www.google.com/url?sa=i&source=images&cd=&ved=2ahUKEwidoP3rw-rlAhV98XMBHdAcBNEQjRx6BAgBEAQ&url=https%3A%2F%2Fwww.ggbearings.com%2Fen%2Fsolutions-bearings%2Freduce-size-weight%2Faerospace%2Flanding-gears&psig=AOvVaw2skCeQ7tOBIDvs0OOBYc7P&ust=1573849323815611

3. Microstructure of 4340 Steel Forging Heat Treatment Annealing Normalising Hardening Tempering Austenite Bainite Austenite+Martensite Pearlite+Pro Eutectoid Ferrite Onset of Martensitic Transformation

4. Mechanical Properties Properties Value Tensile strength 745 MPa Yield strength 470 MPa Bulk modulus (typical for steel) 140 GPa Shear modulus (typical for steel) 80 GPa Elastic modulus 190-210 GPa Poisson's ratio 0.27-0.30 Elongation at break 22% Reduction of area 50% Hardness, Brinell 217 Hardness, Vickers (converted from Brinell hardness) 228

5. FAQ'S What does 4340 stand for? Limitations of 4340 steel How to overcome the limitations in manufacturing? Any competetive material? Image courtsey:http://www.astmsteel.com/steel-knowledge/steel-grade-4130-vs-4340/