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ACI-ASTM CH20 Steel vs. AISI 309HCb Stainless Steel

Both ACI-ASTM CH20 steel and AISI 309HCb stainless steel are iron alloys. They have a very high 98% 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 ACI-ASTM CH20 steel and the bottom bar is AISI 309HCb stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
190
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 38
46
Fatigue Strength, MPa 290
210
Poisson's Ratio 0.27
0.28
Shear Modulus, GPa 78
78
Tensile Strength: Ultimate (UTS), MPa 610
590
Tensile Strength: Yield (Proof), MPa 350
230

Thermal Properties

Latent Heat of Fusion, J/g 310
300
Maximum Temperature: Corrosion, °C 440
510
Maximum Temperature: Mechanical, °C 1100
1090
Melting Completion (Liquidus), °C 1410
1420
Melting Onset (Solidus), °C 1430
1380
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 14
15
Thermal Expansion, µm/m-K 15
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 20
23
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.7
4.1
Embodied Energy, MJ/kg 53
59
Embodied Water, L/kg 180
170

Common Calculations

PREN (Pitting Resistance) 25
23
Resilience: Ultimate (Unit Rupture Work), MJ/m3 200
210
Resilience: Unit (Modulus of Resilience), kJ/m3 300
130
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 22
21
Strength to Weight: Bending, points 21
20
Thermal Diffusivity, mm2/s 3.7
4.0
Thermal Shock Resistance, points 15
13

Alloy Composition

Carbon (C), % 0 to 0.2
0.040 to 0.1
Chromium (Cr), % 22 to 26
22 to 24
Iron (Fe), % 54.7 to 66
56 to 66
Manganese (Mn), % 0 to 1.5
0 to 2.0
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 12 to 15
12 to 16
Niobium (Nb), % 0
0 to 1.1
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 2.0
0 to 0.75
Sulfur (S), % 0 to 0.040
0 to 0.030