# ASTM A588 Grade A (K11430) HSLA Steel

ASTM A588 grade A is a type of ASTM A588 steel. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. ASTM A588 Grade A is the ASTM designation for this material. K11430 is the UNS number.

The graph bars on the material properties cards below compare ASTM A588 grade A to: wrought alloy steels in the same category (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

170

Elastic (Young's, Tensile) Modulus

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

Elongation at Break

22 *%*

Fatigue Strength

270 *MPa* 40 *x 10 ^{3} psi*

Poisson's Ratio

0.29

Shear Modulus

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

Shear Strength

350 *MPa* 51 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

550 *MPa* 80 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

390 *MPa* 56 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

260 *J/g*

Maximum Temperature: Mechanical

410 *°C* 770 *°F*

Melting Completion (Liquidus)

1460 *°C* 2650 *°F*

Melting Onset (Solidus)

1410 *°C* 2580 *°F*

Specific Heat Capacity

470 *J/kg-K* 0.11 *BTU/lb-°F*

Thermal Conductivity

44 *W/m-K* 25 *BTU/h-ft-°F*

Thermal Expansion

13 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

7.4 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

8.5 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

2.3 *% relative*

Density

7.8 *g/cm ^{3}* 490

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

22 *MJ/kg* 9.3 *x 10 ^{3} BTU/lb*

Embodied Water

51 *L/kg* 6.0 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

110 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

400 *kJ/m ^{3}*

Stiffness to Weight: Axial

13 *points*

Stiffness to Weight: Bending

24 *points*

Strength to Weight: Axial

20 *points*

Strength to Weight: Bending

19 *points*

Thermal Diffusivity

12 *mm ^{2}/s*

Thermal Shock Resistance

16 *points*

## Alloy Composition

Fe | 96 to 98.2 | |

Mn | 0.8 to 1.5 | |

Cr | 0.4 to 0.65 | |

Si | 0.3 to 0.65 | |

Cu | 0.25 to 0.4 | |

Ni | 0 to 0.4 | |

C | 0 to 0.19 | |

V | 0.020 to 0.1 | |

S | 0 to 0.050 | |

P | 0 to 0.040 |

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

## Followup Questions

## Similar Alloys

## Further Reading

ASTM A588: Standard Specification for High-Strength Low-Alloy Structural Steel, up to 50 ksi [345 MPa] Minimum Yield Point, with Atmospheric Corrosion Resistance

ASTM A588: Standard Specification for High-Strength Low-Alloy Structural Steel with 50 ksi (345 MPa) Minimum Yield Point to 4 in (100 mm) Thick

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

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

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

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