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Compositions Steel

Reference data and engineering information about compositions steel for material properties applications.

compositionssteel

Overview

Engineering reference data for Compositions Steel in material science and properties.

Key Formulas

Stress

σ=FA\sigma = \frac{F}{A}

Force per unit area.

Strain

ε=ΔLL0\varepsilon = \frac{\Delta L}{L_0}

Change in length per original length.

Hooke's Law

σ=Eε\sigma = E \varepsilon

Stress proportional to strain in elastic region.

Thermal Expansion

ΔL=αL0ΔT\Delta L = \alpha L_0 \Delta T

Length change due to temperature.

Variables

Symbol Description Unit
σ\sigma Stress Pa
ε\varepsilon Strain —
EE Young's modulus Pa
α\alpha Thermal expansion coefficient 1/°C
ΔT\Delta T Temperature change °C

Composition Notes

The chemical composition of steel alloys is not fixed and depends heavily on the specific class, grade, and intended application of the steel. The values in the table represent typical ranges. Key alloying elements influence steel properties:

  • Carbon (C): Primary hardening element. Higher carbon content increases strength and hardness but reduces ductility and weldability.
  • Chromium (Cr): Enhances hardenability, wear resistance, and corrosion resistance.
  • Manganese (Mn): Improves strength, hardness, and wear resistance. Also acts as a deoxidizer and desulfurizer.
  • Molybdenum (Mo): Increases high-temperature strength, hardenability, and resistance to temper brittleness.
  • Nickel (Ni): Improves toughness, especially at low temperatures, and enhances corrosion resistance.

Maximum limits for impurities like Phosphorus (P) and Sulfur (S) are critical for quality control, as these elements can cause brittleness. Silicon (Si) is used as a deoxidizer and contributes to strength.

References