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ASTM A202 Steel vs. ASTM A242 HSLA Steel

Both ASTM A202 steel and ASTM A242 HSLA steel are iron alloys.

For each property being compared, the top bar is ASTM A202 steel and the bottom bar is ASTM A242 HSLA steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180 to 200
150
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 17 to 18
22
Fatigue Strength, MPa 240
230
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 360 to 410
310
Tensile Strength: Ultimate (UTS), MPa 590 to 670
490
Tensile Strength: Yield (Proof), MPa 350 to 360
330

Thermal Properties

Latent Heat of Fusion, J/g 260
250
Maximum Temperature: Mechanical, °C 410
400
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 52
52
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
7.1
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
8.1

Otherwise Unclassified Properties

Base Metal Price, % relative 2.1
1.9
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.4
1.4
Embodied Energy, MJ/kg 19
18
Embodied Water, L/kg 49
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 93 to 96
95
Resilience: Unit (Modulus of Resilience), kJ/m3 330 to 350
290
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 21 to 24
17
Strength to Weight: Bending, points 20 to 22
17
Thermal Diffusivity, mm2/s 14
14
Thermal Shock Resistance, points 17 to 20
14