MakeItFrom.com
Menu (ESC)

SAE-AISI S7 Steel vs. ASTM A387 Grade 21L Class 1

Both SAE-AISI S7 steel and ASTM A387 grade 21L class 1 are iron alloys. They have a very high 98% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI S7 steel and the bottom bar is ASTM A387 grade 21L class 1.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
74
Tensile Strength: Ultimate (UTS), MPa 670 to 2030
500

Thermal Properties

Latent Heat of Fusion, J/g 260
260
Melting Completion (Liquidus), °C 1460
1470
Melting Onset (Solidus), °C 1420
1430
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 40
41
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 9.0
8.8

Otherwise Unclassified Properties

Base Metal Price, % relative 5.0
4.1
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 2.3
1.8
Embodied Energy, MJ/kg 31
23
Embodied Water, L/kg 65
62

Common Calculations

PREN (Pitting Resistance) 8.4
6.4
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 24 to 72
18
Strength to Weight: Bending, points 22 to 46
18
Thermal Diffusivity, mm2/s 11
11
Thermal Shock Resistance, points 22 to 66
14

Alloy Composition

Carbon (C), % 0.45 to 0.55
0 to 0.1
Chromium (Cr), % 3.0 to 3.5
2.8 to 3.3
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 91.6 to 94.9
94.4 to 96.1
Manganese (Mn), % 0.2 to 0.9
0.3 to 0.6
Molybdenum (Mo), % 1.3 to 1.8
0.9 to 1.1
Phosphorus (P), % 0 to 0.030
0 to 0.025
Silicon (Si), % 0.2 to 1.0
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.025
Vanadium (V), % 0 to 0.3
0