# ASTM A182 Grade F12 Class 2 (K11564) Steel

ASTM A182 grade F12 class 2 is an alloy steel formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition. Grade F12 Class 2 is the ASTM designation for this material. K11564 is the UNS number.

It has a moderately low tensile strength among the wrought alloy steels in the same category in the database.

The graph bars on the material properties cards below compare ASTM A182 grade F12 class 2 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

180

Elastic (Young's, Tensile) Modulus

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

Elongation at Break

22 *%*

Fatigue Strength

220 *MPa* 32 *x 10 ^{3} psi*

Poisson's Ratio

0.29

Reduction in Area

34 *%*

Shear Modulus

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

Shear Strength

340 *MPa* 50 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

540 *MPa* 79 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

310 *MPa* 45 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

250 *J/g*

Maximum Temperature: Mechanical

430 *°C* 800 *°F*

Melting Completion (Liquidus)

1460 *°C* 2670 *°F*

Melting Onset (Solidus)

1420 *°C* 2590 *°F*

Specific Heat Capacity

470 *J/kg-K* 0.11 *BTU/lb-°F*

Thermal Conductivity

43 *W/m-K* 25 *BTU/h-ft-°F*

Thermal Expansion

13 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

7.3 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

8.4 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

2.8 *% relative*

Density

7.8 *g/cm ^{3}* 490

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

21 *MJ/kg* 8.9 *x 10 ^{3} BTU/lb*

Embodied Water

52 *L/kg* 6.2 *gal/lb*

## Common Calculations

PREN (Pitting Resistance)

2.8

Resilience: Ultimate (Unit Rupture Work)

100 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

260 *kJ/m ^{3}*

Stiffness to Weight: Axial

13 *points*

Stiffness to Weight: Bending

24 *points*

Strength to Weight: Axial

19 *points*

Strength to Weight: Bending

19 *points*

Thermal Diffusivity

12 *mm ^{2}/s*

Thermal Shock Resistance

16 *points*

## Alloy Composition

Among alloy steels, the composition of ASTM A182 grade F12 class 2 is notable for containing a comparatively high amount of chromium (Cr). Chromium is used to improve corrosion resistance and most mechanical properties (particularly at higher temperatures).

Fe | 96.4 to 98.3 | |

Cr | 0.8 to 1.3 | |

Mn | 0.3 to 0.8 | |

Mo | 0.44 to 0.65 | |

Si | 0.1 to 0.6 | |

C | 0.1 to 0.2 | |

P | 0 to 0.040 | |

S | 0 to 0.040 |

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

## Followup Questions

## Similar Alloys

## Further Reading

ASTM A182: Standard Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service