# Cold Finished 50B60 Boron Steel

Cold finished SAE-AISI 50B60 is SAE-AISI 50B60 steel in the cold worked (strain hardened) condition. The graph bars on the material properties cards below compare cold finished SAE-AISI 50B60 to: SAE-AISI wrought 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

190

Elastic (Young's, Tensile) Modulus

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

Elongation at Break

12 *%*

Fatigue Strength

330 *MPa* 48 *x 10 ^{3} psi*

Poisson's Ratio

0.29

Shear Modulus

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

Shear Strength

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

Tensile Strength: Ultimate (UTS)

630 *MPa* 92 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

530 *MPa* 77 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

250 *J/g*

Maximum Temperature: Mechanical

410 *°C* 770 *°F*

Melting Completion (Liquidus)

1450 *°C* 2650 *°F*

Melting Onset (Solidus)

1410 *°C* 2580 *°F*

Specific Heat Capacity

470 *J/kg-K* 0.11 *BTU/lb-°F*

Thermal Conductivity

45 *W/m-K* 26 *BTU/h-ft-°F*

Thermal Expansion

12 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

7.2 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

8.3 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

2.0 *% 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* 8.2 *x 10 ^{3} BTU/lb*

Embodied Water

48 *L/kg* 5.8 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

71 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

750 *kJ/m ^{3}*

Stiffness to Weight: Axial

13 *points*

Stiffness to Weight: Bending

24 *points*

Strength to Weight: Axial

23 *points*

Strength to Weight: Bending

21 *points*

Thermal Diffusivity

12 *mm ^{2}/s*

Thermal Shock Resistance

20 *points*

## Alloy Composition

Fe | 97.3 to 98.1 | |

Mn | 0.75 to 1.0 | |

C | 0.56 to 0.64 | |

Cr | 0.4 to 0.6 | |

Si | 0.15 to 0.35 | |

S | 0 to 0.040 | |

P | 0 to 0.035 | |

B | 0.00050 to 0.0030 |

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

## Followup Questions

## Further Reading

ASTM A322: Standard Specification for Steel Bars, Alloy, Standard Grades

Boron in Steel, S. K. Banerji and J. E. Morral (editors), 1980

ASTM A29: Standard Specification for Steel Bars, Carbon and Alloy, Hot-Wrought, General Requirements for

Properties and Selection: Irons, Steels and High Performance Alloys, ASM Handbook vol. 1, ASM International, 1993

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

Manufacture and Uses of Alloy Steels, Henry D. Hibbard, 2005

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015

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