ASTM A209 Grade T1b C-Mo Steel
ASTM A209 grade T1b is a type of ASTM A209 steel. Cited properties are appropriate for the normalized condition. It has the lowest strength compared to the other variants of ASTM A209 steel.
The graph bars on the material properties cards below compare ASTM A209 grade T1b 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
140
Elastic (Young's, Tensile) Modulus
190 GPa 27 x 106 psi
Elongation at Break
34 %
Fatigue Strength
180 MPa 25 x 103 psi
Poisson's Ratio
0.29
Rockwell B Hardness
77
Shear Modulus
73 GPa 11 x 106 psi
Shear Strength
280 MPa 40 x 103 psi
Tensile Strength: Ultimate (UTS)
420 MPa 60 x 103 psi
Tensile Strength: Yield (Proof)
220 MPa 32 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)
1430 °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
7.1 % IACS
Electrical Conductivity: Equal Weight (Specific)
8.1 % 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 5.6 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
120 MJ/m3
Resilience: Unit (Modulus of Resilience)
130 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
15 points
Strength to Weight: Bending
16 points
Thermal Diffusivity
13 mm2/s
Thermal Shock Resistance
12 points
Alloy Composition
| Fe | 97.9 to 99.16 | |
| Mn | 0.3 to 0.8 | |
| Mo | 0.44 to 0.65 | |
| Si | 0.1 to 0.5 | |
| C | 0 to 0.14 | |
| 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 A209: Standard Specification for Seamless Carbon-Molybdenum Alloy-Steel Boiler and Superheater Tubes
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
Steels: Processing, Structure, and Performance, 2nd ed., George Krauss, 2015