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EN 1.6570 Steel vs. EN 1.7725 Steel

Both EN 1.6570 steel and EN 1.7725 steel are iron alloys. They have a very high 98% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.6570 steel and the bottom bar is EN 1.7725 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 270 to 340
250 to 300
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11 to 17
14
Fatigue Strength, MPa 500 to 660
390 to 550
Impact Strength: V-Notched Charpy, J 40 to 48
34 to 35
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 910 to 1130
830 to 1000
Tensile Strength: Yield (Proof), MPa 760 to 1060
610 to 860

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 440
440
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 40
39
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.7
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
2.9
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.7
1.8
Embodied Energy, MJ/kg 23
24
Embodied Water, L/kg 56
54

Common Calculations

PREN (Pitting Resistance) 2.5
2.8
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120 to 140
110 to 130
Resilience: Unit (Modulus of Resilience), kJ/m3 1520 to 3010
980 to 1940
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 32 to 40
29 to 35
Strength to Weight: Bending, points 27 to 31
25 to 28
Thermal Diffusivity, mm2/s 11
11
Thermal Shock Resistance, points 27 to 33
24 to 29

Alloy Composition

Carbon (C), % 0.28 to 0.35
0.27 to 0.34
Chromium (Cr), % 1.0 to 1.4
1.3 to 1.7
Iron (Fe), % 94 to 96.2
95.7 to 97.5
Manganese (Mn), % 0.6 to 1.0
0.6 to 1.0
Molybdenum (Mo), % 0.3 to 0.5
0.3 to 0.5
Nickel (Ni), % 1.6 to 2.1
0
Phosphorus (P), % 0 to 0.020
0 to 0.025
Silicon (Si), % 0 to 0.6
0 to 0.6
Sulfur (S), % 0 to 0.015
0 to 0.030
Vanadium (V), % 0
0.050 to 0.15