# ASTM A266 Grade 3 Carbon Steel

ASTM A266 grade 3 is a type of ASTM A266 carbon steel. Cited properties are appropriate for the normalized condition. It has the highest strength and lowest ductility compared to the other variants of ASTM A266 carbon steel.

The graph bars on the material properties cards below compare ASTM A266 grade 3 to: wrought carbon or non-alloy steels (top), all iron alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

## Mechanical Properties

Brinell Hardness

180

Elastic (Young's, Tensile) Modulus

190 *GPa* 27 *x 10 ^{6} psi*

Elongation at Break

21 *%*

Fatigue Strength

200 *MPa* 30 *x 10 ^{3} psi*

Poisson's Ratio

0.29

Reduction in Area

34 *%*

Shear Modulus

73 *GPa* 11 *x 10 ^{6} psi*

Shear Strength

380 *MPa* 55 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

600 *MPa* 87 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

290 *MPa* 42 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

250 *J/g*

Maximum Temperature: Mechanical

400 *°C* 750 *°F*

Melting Completion (Liquidus)

1460 *°C* 2660 *°F*

Melting Onset (Solidus)

1420 *°C* 2590 *°F*

Specific Heat Capacity

470 *J/kg-K* 0.11 *BTU/lb-°F*

Thermal Conductivity

51 *W/m-K* 29 *BTU/h-ft-°F*

Thermal Expansion

12 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

7.1 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

8.2 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

1.8 *% relative*

Density

7.8 *g/cm ^{3}* 490

*lb/ft*

^{3}Embodied Carbon

1.4 *kg CO _{2}/kg material*

Embodied Energy

19 *MJ/kg* 8.0 *x 10 ^{3} BTU/lb*

Embodied Water

47 *L/kg* 5.6 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

110 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

230 *kJ/m ^{3}*

Stiffness to Weight: Axial

13 *points*

Stiffness to Weight: Bending

24 *points*

Strength to Weight: Axial

21 *points*

Strength to Weight: Bending

20 *points*

Thermal Diffusivity

14 *mm ^{2}/s*

Thermal Shock Resistance

19 *points*

## Alloy Composition

Fe | 97.9 to 99.05 | |

Mn | 0.8 to 1.4 | |

Si | 0.15 to 0.35 | |

C | 0 to 0.35 | |

P | 0 to 0.025 | |

S | 0 to 0.025 |

All values are % weight. Ranges represent what is permitted under applicable standards.

## Followup Questions

## Similar Alloys

## Further Reading

ASTM A266: Standard Specification for Carbon Steel Forgings for Pressure Vessel Components

Pressure Vessels: External Pressure Technology, 2nd ed., Carl T. F. Ross, 2011

Carbon Steel Handbook, D. Gandy, 2007

ASM Specialty Handbook: Carbon and Alloy Steels, J. R. Davis (editor), 1996

Ferrous Materials: Steel and Cast Iron, Hans Berns and Werner Theisen, 2008

Steels: Processing, Structure, and Performance, 2nd ed., George Krauss, 2015