STEEL. REDEFINED.™
NSB 72 Powder Metal Alloy
NanoSteel NSB 72 is a nanostructured powder metal steel alloy
featuring extreme hardness and excellent wear resistance with salt
fog corrosion and excellent pitting resistance. The hot hardness
approaches cemented tungsten carbide/cobalt composites.
The spherical morphology of this powder results in an excellent
packing factor for producing high density � nished parts with high
dimensional tolerance control.
The micron-sized powders are centrifugally or gas atomized and are
commonly consolidated by MIM, Additive Manufacturing, HIP or other
processes.
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Examples of current target industries and applications for NSB 72
Powder PropertiesMelt Point 1124° CTheoretical Density 7.78 g/cm³Tap Density 4.56 g/cm³Packing Factor up to 59%Morphology Spherical
Iron (Fe) BalanceChromium (Cr) < 20.0%
Boron (B)
< 4.0%Niobium (Nb) < 5.0%
Carbon (C) < 2.0%
Manganese (Mn) < 1.0%
Silicon (Si) < 1.0%
Copyright © The NanoSteel Company, Inc. All rights reserved.272 West Exchange St., Ste 300, Providence, Rhode Island, 02903
Molybdenum (Mo)
< 5.0%
CUTTING TOOLS BEARING
MINING
Powder Size Range
Hot Isostatic Process (HIP) 80 - 120 µmAdditive Manufacturing (AM) 30 - 50 µmMetal Injection Molding (MIM) 5 - 30 µm
Other Processes Available upon request Micrograph showing the spherical morphology of NSB 72 that results in an excellent packing factor for producing high density finished parts featuring high dimensional tolerance control
Material Chemistry
Process D50
FLOW CONTROL
100 µm
Metal Elements Weight P Elements Weight
−E
NSB 72 Powder Metal Alloy
Copyright © The NanoSteel Company, Inc. All rights reserved.272 West Exchange St., Ste 300, Providence, Rhode Island, 02903
web site www.NanoSteelco.come-mail [email protected]
Toll Free USA & Canada 1-877-293-6266International Calls +1 401 270 3549
Coe� cient of Thermal Expansion (200° C) 9.7 µm/m•KCoe� cient of Thermal Expansion (1000° C) 13.4 µm/m•K
Consolidated (HIP) Alloy
Melt Point 1124° CTheoretical Density 7.78 g/cm3Hardness Vickers 1 1096 HVHardness Rockwell C 72 HRCWear Resistance 2 (mass loss) 0.072 gWear Resistance 2 (volume loss) 9.2 mm3
5 µm
SEM backscatter image: Primary phases – Light colored matrix: alpha-iron; dark grey: chrome borocarbide; white: complex borocarbide
Mas
s Lo
ss (g
)
0.20
0.18
0.16
0.14
0.12
0.10
0.08
0.06
0.04
0.02
0.00
A11LVNSB 72 A11
ASTM G65-044 Wear Resistance Hot Hardness Comparison1700
1500
1300
1100
900
700
500
300
1000 100 200 300 400 500 600 700 800 900
Temperature (° C)
Tool SteelHar
dnes
s (H
V)
MD
NR−
EMediumDifficultNot RecommendedNot Measured
Easy
High Speed Steel
NSB 72
Carbides
Requires special conditions for limited weldability.
Weldability
1 Extrapolated from HRC2 ASTM G65-04 Procedure A
4 ASTM G64-04 Procedure A
Fabrication
Physical, Mechanical and Electrical Properties
Machinability
Alloy
NSB 72AISI A11
AISI A11 LVD2
H13420 SS
Hardness(HRC)
726256594751
SawCarbide Blade
NR
−−−−
LatheCarbide Inserts
NR−−−−−
MillCarbide Inserts
NR−−−−−
DrillCarbide
NRNRNREME
WireEDM
EE
EEE
Grind
MMMEEE
3 ASTM G98
A11NSB 72 316L SS H13
NSB 72 has corrosion resistance when exposed to a salt fog environment5. It performs equal to 316L stainless steel and is superior to hardened 420 stainless steel (51 HRC).5 ASTM G85-A2 cyclic acidi� ed salt fog test for 168 hr (modi� ed ASTM B117)
Salt Fog Corrosion
Corrosion Resistance
Threshold Galling Stress 3 ≥ 103 MPa
Maximum Relative Permiability, µmax 34
NSB 72 Powder Metal Alloy
Copyright © The NanoSteel Company, Inc. All rights reserved.272 West Exchange St., Ste 300, Providence, Rhode Island, 02903
web site www.NanoSteelco.come-mail [email protected]
Toll Free USA & Canada 1-877-293-6266International Calls +1 401 270 3549
In stock – 25 lb containers or bulk quantity upon request.
Availability
NSB 72 has high resistance to pitting in an acidi� ed ferric chloride solution. This alloy has an exceptionally high critical pitting temperature of 85° C according to ASTM G48 Method E.
Pitting Corrosion Pitting Corrosion
Criti
cal P
ittin
g Te
mpe
ratu
re (º
C)
90
80
70
60
50
40
30
20
10
0NSB 72 304L 316L
NSB 72 has low resistance to intergranular attack6 in comparison to 304L and 316L.
Intergranular Corrosion
6 ASTM A262 Method B and C
NSB 72 cyclic potentiodynamic polarization7 (CPP) curves demonstrate higher corrosion resistance than 304L and 316L stainless steel. The CPP curve shows a small amount of hysteresis which indicates that very little permanent damage (e.g. pitting) occurs during the test.
7 ASTM G61 – conducting cyclic potentiodynamic polarization measurements for localized corrosion susceptibility of iron-, nickel- or cobalt-based alloys
Cyclic Potentiodynamic Polarization
NSB 72
Cyclic Potentiodynamic Polarization