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ASTM A148 Grade 130-115 vs. ASTM A148 Grade 135-125

Both ASTM A148 grade 130-115 and ASTM A148 grade 135-125 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 A148 grade 130-115 and the bottom bar is ASTM A148 grade 135-125.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 310
320
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 13
10
Fatigue Strength, MPa 560
590
Poisson's Ratio 0.29
0.29
Reduction in Area, % 28
25
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 1020
1060
Tensile Strength: Yield (Proof), MPa 890
960

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 420
420
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 39
39
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.5
8.5

Otherwise Unclassified Properties

Base Metal Price, % relative 2.7
2.7
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.5
1.5
Embodied Energy, MJ/kg 20
20
Embodied Water, L/kg 50
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
110
Resilience: Unit (Modulus of Resilience), kJ/m3 2110
2470
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 36
38
Strength to Weight: Bending, points 29
29
Thermal Diffusivity, mm2/s 10
10
Thermal Shock Resistance, points 30
31

Alloy Composition

Carbon (C), % 0.25 to 0.35
0.25 to 0.35
Chromium (Cr), % 0.4 to 0.8
0.4 to 0.8
Iron (Fe), % 96.1 to 98.2
96.1 to 98.2
Manganese (Mn), % 0.6 to 1.0
0.6 to 1.0
Molybdenum (Mo), % 0.15 to 0.3
0.15 to 0.3
Nickel (Ni), % 0.4 to 0.8
0.4 to 0.8
Phosphorus (P), % 0 to 0.050
0 to 0.050
Silicon (Si), % 0 to 0.6
0 to 0.6
Sulfur (S), % 0 to 0.060
0 to 0.060