Stainless Steel - AISI 4340
Description
AISI 4340 is a medium carbon, low alloy steel known for its high strength, toughness, and impact resistance. It belongs to the family of nickel chromium molybdenum steels and is often used in applications requiring high strength and wear resistance.
Chemical Composition
The typical chemical composition of AISI 4340 is as follows:
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.38 - 0.43 |
| Manganese (Mn) | 0.65 - 0.85 |
| Silicon (Si) | 0.15 - 0.35 |
| Chromium (Cr) | 0.70 - 0.90 |
| Nickel (Ni) | 1.65 - 2.00 |
| Molybdenum (Mo) | 0.20 - 0.30 |
| Phosphorus (P) | 0.015 max |
| Sulfur (S) | 0.008 max |
| Iron (Fe) | Balance |
Mechanical Properties
The mechanical properties of AISI 4340 steel are as follows:
| Property | Value |
|---|---|
| Yield Strength (MPa) | 934.2 min |
| Tensile Strength (MPa) | 862 - 1931 |
| Elongation (%) | 4 min |
| Reduction of Area (%) | 20 min |
| Hardness (HB) | 187 - 322 |
| Impact Toughness (J) | 14.2 - 52.7 J @ RT |
Thermal & Physical Properties
Other Designations
AISI 4340 is equivalent to several international standards, including:
Fabrication and Heat Treatment
AISI 4340 can be fabricated using various methods, including machining, welding (fusion and resistance), and forming.
Heat Treatment Processes:
Applications
AISI 4340 is widely used in high-stress applications, including:
Supplied Forms
AISI 4340 is available in various forms, including:
Features
This datasheet provides a comprehensive overview of AISI 4340 steel, highlighting its properties and applications, making it a preferred choice in various engineering fields.