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ASTM Grade 100-70-03 vs. ASTM Grade 120-90-02

Both ASTM grade 100-70-03 and ASTM grade 120-90-02 are variants of the same material. They share alloy composition and many physical properties, but develop different mechanical properties as a result of different processing.

For each property being compared, the top bar is ASTM grade 100-70-03 and the bottom bar is ASTM grade 120-90-02.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 270
310
Elastic (Young's, Tensile) Modulus, GPa 180
170
Elongation at Break, % 3.0
2.1
Fracture Toughness, MPa-m1/2 15
14
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 68
66
Shear Strength, MPa 630
800
Tensile Strength: Ultimate (UTS), MPa 770
920
Tensile Strength: Yield (Proof), MPa 530
670

Thermal Properties

Latent Heat of Fusion, J/g 270
270
Maximum Temperature: Mechanical, °C 290
290
Melting Completion (Liquidus), °C 1160
1160
Melting Onset (Solidus), °C 1120
1120
Specific Heat Capacity, J/kg-K 490
490
Thermal Conductivity, W/m-K 31
31
Thermal Expansion, µm/m-K 11
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 9.2
9.2

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
1.9
Density, g/cm3 7.2
7.2
Embodied Carbon, kg CO2/kg material 1.5
1.5
Embodied Energy, MJ/kg 21
21
Embodied Water, L/kg 43
43

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 21
17
Resilience: Unit (Modulus of Resilience), kJ/m3 790
1330
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 26
26
Strength to Weight: Axial, points 30
35
Strength to Weight: Bending, points 26
29
Thermal Diffusivity, mm2/s 8.9
8.9
Thermal Shock Resistance, points 29
35

Alloy Composition

Carbon (C), % 3.0 to 3.5
3.0 to 3.5
Iron (Fe), % 93.7 to 95.5
93.7 to 95.5
Phosphorus (P), % 0 to 0.080
0 to 0.080
Silicon (Si), % 1.5 to 2.8
1.5 to 2.8