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EN 1.8201 (7CrWVMoNb9-6) Chromium-Tungsten Steel

EN 1.8201 steel is an alloy steel formulated for primary forming into wrought products. Cited properties are appropriate for the normalized and tempered condition. 1.8201 is the EN numeric designation for this material. 7CrWVMoNb9-6 is the EN chemical designation.

It has a very high density among EN wrought alloy steels. In addition, it has a very high melting temperature and a very high embodied energy.

The graph bars on the material properties cards below compare EN 1.8201 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

190

Elastic (Young's, Tensile) Modulus

190 GPa 28 x 106 psi

Elongation at Break

20 %

Fatigue Strength

310 MPa 45 x 103 psi

Impact Strength: V-Notched Charpy

38 J 28 ft-lb

Poisson's Ratio

0.29

Shear Modulus

74 GPa 11 x 106 psi

Shear Strength

390 MPa 57 x 103 psi

Tensile Strength: Ultimate (UTS)

630 MPa 91 x 103 psi

Tensile Strength: Yield (Proof)

450 MPa 65 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

450 °C 840 °F

Melting Completion (Liquidus)

1500 °C 2730 °F

Melting Onset (Solidus)

1450 °C 2650 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

40 W/m-K 23 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

7.8 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.8 % IACS

Otherwise Unclassified Properties

Base Metal Price

7.0 % relative

Density

8.0 g/cm3 500 lb/ft3

Embodied Carbon

2.5 kg CO2/kg material

Embodied Energy

36 MJ/kg 16 x 103 BTU/lb

Embodied Water

59 L/kg 7.0 gal/lb

Common Calculations

PREN (Pitting Resistance)

5.7

Resilience: Ultimate (Unit Rupture Work)

110 MJ/m3

Resilience: Unit (Modulus of Resilience)

530 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

22 points

Strength to Weight: Bending

20 points

Thermal Diffusivity

11 mm2/s

Thermal Shock Resistance

18 points

Alloy Composition

Among alloy steels, the composition of EN 1.8201 steel is notable for including tungsten (W) and boron (B). Tungsten interacts with other alloying elements to a greater extent than usual, which makes it hard to broadly characterize its effects. Boron is used to improve hardenability. It has a substantial effect when added in even tiny amounts.

Iron (Fe) 93.6 to 96.2
Chromium (Cr) 1.9 to 2.6
Tungsten (W) 1.5 to 1.8
Manganese (Mn) 0.1 to 0.6
Silicon (Si) 0 to 0.5
Vanadium (V) 0.2 to 0.3
Molybdenum (Mo) 0.050 to 0.3
Carbon (C) 0.040 to 0.1
Niobium (Nb) 0.020 to 0.080
Titanium (Ti) 0.0050 to 0.060
Phosphorus (P) 0 to 0.030
Aluminum (Al) 0 to 0.030
Nitrogen (N) 0 to 0.015
Sulfur (S) 0 to 0.010
Boron (B) 0.0010 to 0.0060

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

Followup Questions

Similar Alloys

Further Reading

EN 10216-2: Seamless steel tubes for pressure purposes - Technical delivery conditions - Part 2: Non-alloy and alloy steel tubes with specified elevated temperature properties

Microstructure of Steels and Cast Irons, Madeleine Durand-Charre, 2004

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

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