EN 1.4986 (X7CrNiMoBNb16-16) Stainless Steel
EN 1.4986 stainless steel is an austenitic stainless steel formulated for primary forming into wrought products. Cited properties are appropriate for the aged (precipitation hardened) condition. 1.4986 is the EN numeric designation for this material. X7CrNiMoBNb16-16 is the EN chemical designation.
It has a moderately high base cost among wrought austenitic stainless steels. In addition, it has a moderately high embodied energy and a fairly low ductility.
The graph bars on the material properties cards below compare EN 1.4986 stainless steel to: wrought austenitic stainless 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
230
Elastic (Young's, Tensile) Modulus
200 GPa 29 x 106 psi
Elongation at Break
18 %
Fatigue Strength
350 MPa 50 x 103 psi
Impact Strength: V-Notched Charpy
57 J 42 ft-lb
Poisson's Ratio
0.28
Shear Modulus
77 GPa 11 x 106 psi
Shear Strength
460 MPa 67 x 103 psi
Tensile Strength: Ultimate (UTS)
750 MPa 110 x 103 psi
Tensile Strength: Yield (Proof)
560 MPa 81 x 103 psi
Thermal Properties
Latent Heat of Fusion
290 J/g
Maximum Temperature: Corrosion
520 °C 960 °F
Maximum Temperature: Mechanical
940 °C 1720 °F
Melting Completion (Liquidus)
1450 °C 2630 °F
Melting Onset (Solidus)
1400 °C 2550 °F
Specific Heat Capacity
470 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
15 W/m-K 8.7 BTU/h-ft-°F
Thermal Expansion
17 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
2.3 % IACS
Electrical Conductivity: Equal Weight (Specific)
2.6 % IACS
Otherwise Unclassified Properties
Base Metal Price
25 % relative
Density
7.9 g/cm3 500 lb/ft3
Embodied Carbon
4.8 kg CO2/kg material
Embodied Energy
67 MJ/kg 29 x 103 BTU/lb
Embodied Water
150 L/kg 18 gal/lb
Common Calculations
PREN (Pitting Resistance)
22
Resilience: Ultimate (Unit Rupture Work)
120 MJ/m3
Resilience: Unit (Modulus of Resilience)
790 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
26 points
Strength to Weight: Bending
23 points
Thermal Diffusivity
4.0 mm2/s
Thermal Shock Resistance
16 points
Alloy Composition
Among wrought stainless steels, the composition of EN 1.4986 stainless steel is notable for including boron (B) and niobium (Nb). Boron is used to improve hardenability. It has a substantial effect when added in even tiny amounts. It can also facilitate sintering. Niobium is primarily used to improve yield strength, particularly at elevated temperatures.
| Fe | 59.4 to 66.6 | |
| Ni | 15.5 to 17.5 | |
| Cr | 15.5 to 17.5 | |
| Mo | 1.6 to 2.0 | |
| Nb | 0.4 to 1.2 | |
| Mn | 0 to 1.5 | |
| Si | 0.3 to 0.6 | |
| B | 0.050 to 0.1 | |
| C | 0.040 to 0.1 | |
| P | 0 to 0.045 | |
| S | 0 to 0.030 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
EN 10269: Steels and nickel alloys for fasteners with specified elevated and/or low temperature properties
Machining of Stainless Steels and Super Alloys: Traditional and Nontraditional Techniques, Helmi A. Youssef, 2016
EN 10088-1: Stainless steels - Part 1: List of stainless steels
Corrosion of Austenitic Stainless Steels: Mechanism, Mitigation and Monitoring, H. S. Khatak and B. Raj (editors), 2002
Austenitic Stainless Steels: Microstructure and Mechanical Properties, P. Marshall, 1984
Advances in Stainless Steels, Baldev Raj et al. (editors), 2010
CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015