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AISI 304H Stainless Steel vs. ASTM A229 Spring Steel

Both AISI 304H stainless steel and ASTM A229 spring steel are iron alloys. They have 71% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is AISI 304H stainless steel and the bottom bar is ASTM A229 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
490 to 550
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 40
14
Fatigue Strength, MPa 200
710 to 790
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
72
Shear Strength, MPa 400
1020 to 1140
Tensile Strength: Ultimate (UTS), MPa 580
1690 to 1890
Tensile Strength: Yield (Proof), MPa 230
1100 to 1230

Thermal Properties

Latent Heat of Fusion, J/g 290
250
Maximum Temperature: Mechanical, °C 960
400
Melting Completion (Liquidus), °C 1430
1450
Melting Onset (Solidus), °C 1380
1410
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 17
50
Thermal Expansion, µm/m-K 16
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.8
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 15
1.8
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.0
1.4
Embodied Energy, MJ/kg 43
19
Embodied Water, L/kg 150
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
200 to 230
Resilience: Unit (Modulus of Resilience), kJ/m3 130
3260 to 4080
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 21
60 to 67
Strength to Weight: Bending, points 20
40 to 43
Thermal Diffusivity, mm2/s 4.5
14
Thermal Shock Resistance, points 13
54 to 60

Alloy Composition

Carbon (C), % 0.040 to 0.1
0.55 to 0.85
Chromium (Cr), % 18 to 20
0
Iron (Fe), % 66.6 to 74
97.5 to 99
Manganese (Mn), % 0 to 2.0
0.3 to 1.2
Nickel (Ni), % 8.0 to 10.5
0
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 0.75
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.050