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ASTM A285 Carbon Steel vs. ASTM A242 HSLA Steel

Both ASTM A285 carbon steel and ASTM A242 HSLA steel are iron alloys.

For each property being compared, the top bar is ASTM A285 carbon steel and the bottom bar is ASTM A242 HSLA steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 110 to 130
150
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 30 to 34
22
Fatigue Strength, MPa 150 to 180
230
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 250 to 290
310
Tensile Strength: Ultimate (UTS), MPa 380 to 450
490
Tensile Strength: Yield (Proof), MPa 190 to 230
330

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 400
400
Melting Completion (Liquidus), °C 1470
1460
Melting Onset (Solidus), °C 1420 to 1430
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 53
52
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.0
7.1
Electrical Conductivity: Equal Weight (Specific), % IACS 8.0
8.1

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
1.9
Density, g/cm3 7.9
7.9
Embodied Carbon, kg CO2/kg material 1.4
1.4
Embodied Energy, MJ/kg 18
18
Embodied Water, L/kg 46
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
95
Resilience: Unit (Modulus of Resilience), kJ/m3 94 to 150
290
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 13 to 16
17
Strength to Weight: Bending, points 15 to 17
17
Thermal Diffusivity, mm2/s 14
14
Thermal Shock Resistance, points 12 to 14
14