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ASTM Grade LC1 (J12522) Cast Carbon-Molybdenum Steel

ASTM grade LC1 steel is an alloy steel formulated for casting. Cited properties are appropriate for the normalized and tempered condition. LC1 is the ASTM designation for this material. J12522 is the UNS number.

It has a fairly high ductility among cast alloy steels. In addition, it has a very low electrical conductivity and a very low tensile strength.

The graph bars on the material properties cards below compare ASTM grade LC1 steel to: cast 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

160

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

27 %

Fatigue Strength

200 MPa 30 x 103 psi

Poisson's Ratio

0.29

Reduction in Area

40 %

Shear Modulus

73 GPa 11 x 106 psi

Tensile Strength: Ultimate (UTS)

540 MPa 78 x 103 psi

Tensile Strength: Yield (Proof)

270 MPa 40 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

410 °C 760 °F

Melting Completion (Liquidus)

1470 °C 2670 °F

Melting Onset (Solidus)

1420 °C 2600 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

50 W/m-K 29 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

7.2 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.2 % IACS

Otherwise Unclassified Properties

Base Metal Price

2.4 % relative

Density

7.9 g/cm3 490 lb/ft3

Embodied Carbon

1.5 kg CO2/kg material

Embodied Energy

20 MJ/kg 8.6 x 103 BTU/lb

Embodied Water

47 L/kg 5.7 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

120 MJ/m3

Resilience: Unit (Modulus of Resilience)

200 kJ/m3

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

13 mm2/s

Thermal Shock Resistance

16 points

Alloy Composition

Among cast alloy steels, the composition of ASTM grade LC1 steel is notable for containing comparatively high amounts of manganese (Mn) and molybdenum (Mo). Manganese is used to improve hardenability and surface quality. Molybdenum is used to facilitate tempering. In addition, it offers modest bonuses to a wide range of material properties.

Iron (Fe) 97.6 to 99.05
Manganese (Mn) 0.5 to 0.8
Molybdenum (Mo) 0.45 to 0.65
Silicon (Si) 0 to 0.6
Carbon (C) 0 to 0.25
Sulfur (S) 0 to 0.045
Phosphorus (P) 0 to 0.040

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

Followup Questions

Similar Alloys

Further Reading

ASTM A352: Standard Specification for Steel Castings, Ferritic and Martensitic, for Pressure-Containing Parts, Suitable for Low-Temperature Service

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

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

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