1. No category

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.
FLOW CONTROL
MINING
CUTTING TOOLS
BEARING
The spherical morphology of this powder results in an excellent
packing factor for producing high density finished 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.
Examples of current target industries and applications for NSB 72
Material Chemistry
Metal Elements
Iron (Fe)
Chromium (Cr)
Niobium (Nb)
Molybdenum (Mo)
Manganese (Mn)
Weight
Balance
< 20.0%
< 5.0%
< 4.0%
< 1.0%
P Elements
Boron (B)
Carbon (C)
Silicon (Si)
Weight
< 5.0%
< 2.0%
< 1.0%
Powder Properties
Melt Point
Theoretical Density
Tap Density
Packing Factor
Morphology
1124° C
7.78 g/cm³
4.56 g/cm³
up to 59%
Spherical
Powder Size Range
Process
Metal Injection Molding (MIM)
Additive Manufacturing (AM)
Hot Isostatic Process (HIP)
Other Processes
D50
5 - 30 µm
30 - 50 µm
80 - 120 µm
Available upon request
Copyright © The NanoSteel Company, Inc. All rights reserved.
272 West Exchange St., Ste 300, Providence, Rhode Island, 02903
100 µm
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
Toll Free USA & Canada 1-877-293-6266
International Calls
+1 401 270 3549
web site www.NanoSteelco.com
e-mail
info@nanosteelco.com
NSB 72
Powder Metal Alloy
Consolidated (HIP) Alloy
Physical, Mechanical and Electrical Properties
Melt Point
1124° C
Theoretical Density
7.78 g/cm3
Hardness Vickers 1
1096 HV
Hardness Rockwell C
72 HRC
Wear Resistance 2 (mass loss)
0.072 g
Wear Resistance 2 (volume loss)
9.2 mm3
Threshold Galling Stress 3
≥ 103 MPa
Coefficient of Thermal Expansion (200° C)
9.7 µm/m•K
Coefficient of Thermal Expansion (1000° C)
13.4 µm/m•K
Maximum Relative Permiability, µmax
34
1 Extrapolated from HRC
2 ASTM G65-04 Procedure A
5 µm
SEM backscatter image: Primary phases – Light colored matrix: alphairon; dark grey: chrome borocarbide; white: complex borocarbide
3 ASTM G98
ASTM G65-044 Wear Resistance
Hot Hardness Comparison
1700
0.20
1500
0.16
Hardness (HV)
Mass Loss (g)
0.18
0.14
0.12
0.10
0.08
0.06
0.04
0.02
1100
NSB 72
900
High Speed Steel
700
Tool Steel
500
300
0.00
NSB 72
4
Carbides
1300
A11LV
A11
100
0
100
200
300
400
500
600
Temperature (° C)
700
800
900
ASTM G64-04 Procedure A
Fabrication
Machinability
Alloy
NSB 72
AISI A11
AISI A11 LV
D2
H13
420 SS
Hardness
(HRC)
72
62
56
59
47
51
Saw
Lathe
Mill
Carbide Blade Carbide Inserts Carbide Inserts
NR
NR
NR
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
Drill
Carbide
NR
NR
NR
E
M
E
Wire
EDM
E
E
E
E
E
E
Grind
M
M
M
E
E
E
E
M
D
NR
−
Easy
Medium
Difficult
Not Recommended
Not Measured
Weldability
Requires special conditions for limited weldability.
Corrosion Resistance
Salt Fog Corrosion
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
NSB 72
316L SS
A11
ASTM G85-A2 cyclic acidified salt fog test for 168 hr (modified ASTM B117)
Copyright © The NanoSteel Company, Inc. All rights reserved.
272 West Exchange St., Ste 300, Providence, Rhode Island, 02903
Toll Free USA & Canada 1-877-293-6266
International Calls
+1 401 270 3549
web site www.NanoSteelco.com
e-mail
info@nanosteelco.com
H13
NSB 72
Pitting Corrosion
Pitting Corrosion
90
80
Critical Pitting Temperature (ºC)
NSB 72 has high resistance to pitting in an acidified ferric
chloride solution. This alloy has an exceptionally high
critical pitting temperature of 85° C according to ASTM
G48 Method E.
Powder Metal Alloy
70
60
50
40
30
20
10
0
NSB 72
304L
316L
Intergranular Corrosion
NSB 72 has low resistance to intergranular attack6 in
comparison to 304L and 316L.
6
ASTM A262 Method B and C
Cyclic Potentiodynamic Polarization
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
Cyclic Potentiodynamic Polarization
ASTM G61 – conducting cyclic potentiodynamic polarization measurements for
localized corrosion susceptibility of iron-, nickel- or cobalt-based alloys
NSB 72
Availability
In stock – 25 lb containers or bulk quantity upon request.
Copyright © The NanoSteel Company, Inc. All rights reserved.
272 West Exchange St., Ste 300, Providence, Rhode Island, 02903
Toll Free USA & Canada 1-877-293-6266
International Calls
+1 401 270 3549
web site www.NanoSteelco.com
e-mail
info@nanosteelco.com