NSB 72 Powder Metal Alloy - NanoSteel · NSB 72 Powder Metal Alloy NanoSteel NSB 72 is a nanostructured powder metal steel alloy featuring extreme hardness and excellent wear resistance

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.

web site www.NanoSteelco.come-mail [email protected]

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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%

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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





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





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

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NSB 72 Powder Metal Alloy - NanoSteel · NSB 72 Powder Metal Alloy NanoSteel NSB 72 is a nanostructured powder metal steel alloy featuring extreme hardness and excellent wear resistance