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EN 1.4749 Stainless Steel vs. ASTM A387 Grade 21L Class 1

Both EN 1.4749 stainless steel and ASTM A387 grade 21L class 1 are iron alloys. Both are furnished in the annealed condition. They have 75% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is EN 1.4749 stainless steel and the bottom bar is ASTM A387 grade 21L class 1.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
150
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 16
21
Fatigue Strength, MPa 190
160
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 80
74
Shear Strength, MPa 370
310
Tensile Strength: Ultimate (UTS), MPa 600
500
Tensile Strength: Yield (Proof), MPa 320
230

Thermal Properties

Latent Heat of Fusion, J/g 300
260
Maximum Temperature: Mechanical, °C 1100
480
Melting Completion (Liquidus), °C 1420
1470
Melting Onset (Solidus), °C 1380
1430
Specific Heat Capacity, J/kg-K 490
470
Thermal Conductivity, W/m-K 17
41
Thermal Expansion, µm/m-K 9.6
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
8.8

Otherwise Unclassified Properties

Base Metal Price, % relative 13
4.1
Density, g/cm3 7.6
7.9
Embodied Carbon, kg CO2/kg material 2.5
1.8
Embodied Energy, MJ/kg 36
23
Embodied Water, L/kg 160
62

Common Calculations

PREN (Pitting Resistance) 31
6.4
Resilience: Ultimate (Unit Rupture Work), MJ/m3 80
84
Resilience: Unit (Modulus of Resilience), kJ/m3 250
140
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 26
24
Strength to Weight: Axial, points 22
18
Strength to Weight: Bending, points 21
18
Thermal Diffusivity, mm2/s 4.6
11
Thermal Shock Resistance, points 22
14

Alloy Composition

Carbon (C), % 0.15 to 0.2
0 to 0.1
Chromium (Cr), % 26 to 29
2.8 to 3.3
Iron (Fe), % 68.5 to 73.7
94.4 to 96.1
Manganese (Mn), % 0 to 1.0
0.3 to 0.6
Molybdenum (Mo), % 0
0.9 to 1.1
Nitrogen (N), % 0.15 to 0.25
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 0.015
0 to 0.025