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EN 1.7216 (30CrMo4) Chromium-Molybdenum Steel

EN 1.7216 steel is an alloy steel formulated for primary forming into wrought products. 1.7216 is the EN numeric designation for this material. 30CrMo4 is the EN chemical designation. It has a moderately low electrical conductivity among the EN wrought alloy steels in the database.

The properties of EN 1.7216 steel include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare EN 1.7216 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 to 280

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

12 to 23 %

Fatigue Strength

290 to 440 MPa 41 to 63 x 103 psi

Poisson's Ratio

0.29

Shear Modulus

73 GPa 11 x 106 psi

Shear Strength

410 to 560 MPa 60 to 81 x 103 psi

Tensile Strength: Ultimate (UTS)

650 to 930 MPa 94 to 140 x 103 psi

Tensile Strength: Yield (Proof)

400 to 690 MPa 58 to 100 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

420 °C 790 °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

46 W/m-K 26 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

7.2 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.3 % IACS

Otherwise Unclassified Properties

Base Metal Price

2.4 % 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

50 L/kg 6.0 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

110 to 130 MJ/m3

Resilience: Unit (Modulus of Resilience)

430 to 1280 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

23 to 33 points

Strength to Weight: Bending

21 to 27 points

Thermal Diffusivity

12 mm2/s

Thermal Shock Resistance

19 to 27 points

Alloy Composition

Among alloy steels, the composition of EN 1.7216 steel is notable for containing comparatively high amounts of chromium (Cr) and manganese (Mn). Chromium is used to improve corrosion resistance and most mechanical properties (particularly at higher temperatures). Manganese is used to improve hardenability, hot workability, and surface quality. There is some loss of ductility and weldability, however.

Iron (Fe) 97.2 to 98.4
Chromium (Cr) 0.8 to 1.2
Manganese (Mn) 0.35 to 0.6
Carbon (C) 0.27 to 0.34
Molybdenum (Mo) 0.15 to 0.3
Silicon (Si) 0 to 0.35
Phosphorus (P) 0 to 0.035
Sulfur (S) 0 to 0.035

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

Followup Questions

Similar Alloys

Further Reading

EN 10297-1: Seamless circular steel tubes for mechanical and general engineering purposes - Technical delivery conditions - Part 1: Non-alloy and alloy steel tubes

ASM Specialty Handbook: Carbon and Alloy Steels, J. R. Davis (editor), 1996

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