Overview
Engineering reference data for Alloy Steel in material science and properties.
Key Formulas
Stress
Force per unit area.
Strain
Change in length per original length.
Hooke's Law
Stress proportional to strain in elastic region.
Thermal Expansion
Length change due to temperature.
Variables
| Symbol | Description | Unit |
|---|---|---|
| Stress | Pa | |
| Strain | — | |
| Young's modulus | Pa | |
| Thermal expansion coefficient | 1/°C | |
| Temperature change | °C |
Alloying Element Requirements
Alloy Steel must meet specific criteria for alloying element content to be classified as such:
- Manganese: >1.65%
- Silicon: >0.60%
- Copper: >0.60%
Additionally, it typically requires a definite range or minimum quantity of one or more of the following elements to achieve desired properties like strength and corrosion resistance:
- Aluminum
- Boron
- Chromium
- Cobalt
- Columbium
- Molybdenum
- Nickel
- Titanium
- Tungsten
- Vanadium
- Zirconium
References
Alloying Element Thresholds
The content of alloying elements in alloy steel exceeds one or more of the following limits:
Purpose of Alloying Elements
Alloying elements such as nickel, chromium, molybdenum, and vanadium are added to the steel base to significantly modify and enhance its properties. Their primary functions include:
- Improving Mechanical Properties: Increases strength, hardness, and wear resistance.
- Enhancing Physical & Chemical Properties: Improves corrosion resistance, heat resistance (for high-temperature applications), and magnetic properties.
- Improving Manufacturing Properties: Aids machinability, weldability, and formability.
- Achieving Specific Microstructures: Facilitates the formation of desired phases and heat treatment responses.
The specific combination and proportion of alloying elements are selected to achieve the target performance characteristics for the steel's intended application.