EN 1.7243 (18CrMo4) Chromium-Molybdenum Steel

Other Steels

Material conditionquenched and tempered

Overview Chemical Composition Mechanical Properties Physical Properties Other Properties

Property Overview

Density7.8g/cm³

Elastic Modulus190GPa

Tensile Strength540MPa

Yield Strength310MPa

Brinell Hardness160HB

Maximum Service Temperature420°C

Weight Calculator

Chemical Composition

0.15 to 0.21%

0.9 to 1.2%

0.15 to 0.25%

0.6 to 0.9%

0 to 0.4%

0 to 0.035%

0 to 0.25%

96.8 to 98.2%

Mechanical

Elastic (Young's, Tensile) Modulus

190 GPa

Elongation at Break

23 %

Fatigue Strength

220 MPa

Impact Strength: V-Notched Charpy

57 J

Poisson's Ratio

0.29

Shear Modulus

73 GPa

Shear Strength

340 MPa

Tensile Strength: Ultimate (UTS)

540 MPa

Tensile Strength: Yield (Proof)

310 MPa

Hardness

Brinell Hardness

160

Physical

Density

7.8 g/cm 3

Thermal

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

420 °C

Melting Completion (Liquidus)

1460 °C

Melting Onset (Solidus)

1420 °C

Specific Heat Capacity

470 J/kg-K

Thermal Conductivity

44 W/m-K

Thermal Diffusivity

12 mm 2 /s

Thermal Expansion

13 µm/m-K

Thermal Shock Resistance

16 points

Electrical

Electrical Conductivity: Equal Volume

7.3 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.3 % IACS

Calculated

Resilience: Ultimate (Unit Rupture Work)

110 MJ/m 3

Resilience: Unit (Modulus of Resilience)

260 kJ/m 3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

19 points

Strength to Weight: Bending

19 points

Environmental

Base Metal Price

2.5 % relative

Embodied Carbon

1.5 kg CO 2 /kg material

Embodied Energy

20 MJ/kg

Embodied Energy

20 MJ/kg 8.5 x 10 3 BTU/lb

Embodied Water

51 L/kg

Embodied Water

51 L/kg 6.1 gal/lb

Registered Designations & Aliases

1.72431.724318CrMo418CrMo4EN 1.7243 (18CrMo4) Chromium-Molybdenum Steel

Standards

EN 10084 EN 10084: 2008 Case hardening steels. Technical delivery conditions

EN 10250-3 EN 10250-3: 2000 Open steel die forgings for general engineering purposes. Alloy special steels

EN 10250-3 EN 10250-3: Open die steel forgings for general engineering purposes - Part 3: Alloy special steels

EN 10250-3 EN 10250-3: Open die steel forgings for general engineering purposes - Part 3: Alloy special steels EN 10263-3: Steel rod, bars and wire for cold heading and cold extrusion - Part 3: Technical delivery conditions for case hardening steels Welding Metallurgy, 2nd ed., Sindo Kou, 2003 Manufacture and Uses of Alloy Steels, Henry D. Hibbard, 2005

EN 10263-3 EN 10263-3: 2001 Steel rod, bars and wire for cold heading and cold extrusion. Technical delivery conditions for case hardening steels

EN 10263-3 EN 10263-3: Steel rod, bars and wire for cold heading and cold extrusion - Part 3: Technical delivery conditions for case hardening steels