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S17700 Stainless Steel vs. ASTM A387 Grade 21 Steel

Both S17700 stainless steel and ASTM A387 grade 21 steel are iron alloys. They have 77% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is S17700 stainless steel and the bottom bar is ASTM A387 grade 21 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180 to 430
150 to 180
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 1.0 to 23
21
Fatigue Strength, MPa 290 to 560
160 to 250
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
74
Shear Strength, MPa 740 to 940
310 to 370
Tensile Strength: Ultimate (UTS), MPa 1180 to 1650
500 to 590
Tensile Strength: Yield (Proof), MPa 430 to 1210
230 to 350

Thermal Properties

Latent Heat of Fusion, J/g 290
260
Maximum Temperature: Mechanical, °C 890
480
Melting Completion (Liquidus), °C 1440
1470
Melting Onset (Solidus), °C 1400
1430
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 15
41
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.3
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
8.8

Otherwise Unclassified Properties

Base Metal Price, % relative 13
4.1
Density, g/cm3 7.7
7.9
Embodied Carbon, kg CO2/kg material 2.8
1.8
Embodied Energy, MJ/kg 40
23
Embodied Water, L/kg 150
62

Common Calculations

PREN (Pitting Resistance) 17
6.4
Resilience: Ultimate (Unit Rupture Work), MJ/m3 15 to 210
84 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 460 to 3750
140 to 320
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 42 to 59
18 to 21
Strength to Weight: Bending, points 32 to 40
18 to 20
Thermal Diffusivity, mm2/s 4.1
11
Thermal Shock Resistance, points 39 to 54
14 to 17

Alloy Composition

Aluminum (Al), % 0.75 to 1.5
0
Carbon (C), % 0 to 0.090
0.050 to 0.15
Chromium (Cr), % 16 to 18
2.8 to 3.3
Iron (Fe), % 70.5 to 76.8
94.4 to 96
Manganese (Mn), % 0 to 1.0
0.3 to 0.6
Molybdenum (Mo), % 0
0.9 to 1.1
Nickel (Ni), % 6.5 to 7.8
0
Phosphorus (P), % 0 to 0.040
0 to 0.025
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.025

Comparable Variants