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AISI 302 Stainless Steel vs. AISI 304 Stainless Steel

Both AISI 302 stainless steel and AISI 304 stainless steel are iron alloys. They have a very high 99% of their average alloy composition in common.

For each property being compared, the top bar is AISI 302 stainless steel and the bottom bar is AISI 304 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170 to 440
170 to 360
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 4.5 to 46
8.0 to 43
Fatigue Strength, MPa 210 to 520
210 to 440
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
77
Shear Strength, MPa 400 to 830
400 to 690
Tensile Strength: Ultimate (UTS), MPa 580 to 1430
580 to 1180
Tensile Strength: Yield (Proof), MPa 230 to 1100
230 to 860

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Maximum Temperature: Corrosion, °C 410
420
Maximum Temperature: Mechanical, °C 710
710
Melting Completion (Liquidus), °C 1420
1450
Melting Onset (Solidus), °C 1400
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 16
16
Thermal Expansion, µm/m-K 17
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.8
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 15
15
Calomel Potential, mV -70
-80
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.0
3.0
Embodied Energy, MJ/kg 42
43
Embodied Water, L/kg 140
150

Common Calculations

PREN (Pitting Resistance) 19
20
Resilience: Ultimate (Unit Rupture Work), MJ/m3 59 to 260
86 to 250
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 3070
140 to 1870
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 21 to 51
21 to 42
Strength to Weight: Bending, points 20 to 36
20 to 32
Thermal Diffusivity, mm2/s 4.4
4.2
Thermal Shock Resistance, points 12 to 31
12 to 25

Alloy Composition

Carbon (C), % 0 to 0.15
0 to 0.080
Chromium (Cr), % 17 to 19
18 to 20
Iron (Fe), % 67.9 to 75
66.5 to 74
Manganese (Mn), % 0 to 2.0
0 to 2.0
Nickel (Ni), % 8.0 to 10
8.0 to 10.5
Nitrogen (N), % 0 to 0.1
0 to 0.1
Phosphorus (P), % 0 to 0.045
0 to 0.045
Silicon (Si), % 0 to 0.75
0 to 0.75
Sulfur (S), % 0 to 0.030
0 to 0.030

Comparable Variants