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EN 1.7219 (26CrMo4-2) Chromium-Molybdenum Steel

EN 1.7219 steel is an alloy steel formulated for primary forming into wrought products. Cited properties are appropriate for the quenched and tempered condition. 1.7219 is the EN numeric designation for this material. 26CrMo4-2 is the EN chemical designation.

It has a moderately low tensile strength among the EN wrought alloy steels in the database.

The graph bars on the material properties cards below compare EN 1.7219 steel to: EN wrought alloy steels (top), all iron alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Brinell Hardness

200

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

19 %

Fatigue Strength

340 MPa 49 x 103 psi

Impact Strength: V-Notched Charpy

57 J 42 ft-lb

Poisson's Ratio

0.29

Shear Modulus

73 GPa 11 x 106 psi

Shear Strength

400 MPa 59 x 103 psi

Tensile Strength: Ultimate (UTS)

650 MPa 94 x 103 psi

Tensile Strength: Yield (Proof)

490 MPa 71 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

420 °C 800 °F

Melting Completion (Liquidus)

1460 °C 2660 °F

Melting Onset (Solidus)

1420 °C 2590 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

44 W/m-K 25 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

7.3 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.4 % IACS

Otherwise Unclassified Properties

Base Metal Price

2.5 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

1.5 kg CO2/kg material

Embodied Energy

20 MJ/kg 8.5 x 103 BTU/lb

Embodied Water

51 L/kg 6.1 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

110 MJ/m3

Resilience: Unit (Modulus of Resilience)

650 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

23 points

Strength to Weight: Bending

21 points

Thermal Diffusivity

12 mm2/s

Thermal Shock Resistance

19 points

Alloy Composition

Among alloy steels, the composition of EN 1.7219 steel is notable for including copper (Cu) and containing a comparatively high amount of chromium (Cr). Copper is used to improve corrosion resistance, and to add at least some degree of precipitation hardenability. Chromium is used to improve corrosion resistance and most mechanical properties (particularly at higher temperatures).

Iron (Fe) 96.7 to 98.2
Chromium (Cr) 0.9 to 1.2
Manganese (Mn) 0.5 to 0.8
Carbon (C) 0.22 to 0.29
Molybdenum (Mo) 0.15 to 0.3
Silicon (Si) 0 to 0.35
Copper (Cu) 0 to 0.3
Phosphorus (P) 0 to 0.025
Sulfur (S) 0 to 0.010

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

EN 10216-4: Seamless steel tubes for pressure purposes - Technical delivery conditions - Part 4: Non-alloy and alloy steel tubes with specified low temperature properties

Pressure Vessels: External Pressure Technology, 2nd ed., Carl T. F. Ross, 2011

Manufacture and Uses of Alloy Steels, Henry D. Hibbard, 2005

Ferrous Materials: Steel and Cast Iron, Hans Berns and Werner Theisen, 2008

Steels: Processing, Structure, and Performance, 2nd ed., George Krauss, 2015