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| Application Process |
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| High Velocity Oxygen Fuel (HVOF) thermal spraying |
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| Material Chemistry (wt%) |
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| Chromium |
< 20% |
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| Tungsten |
< 10% |
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| Boron |
< 5% |
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| Manganese |
< 5% |
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| Molybdenum |
< 5% |
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| Carbon |
< 2% |
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| Silicon |
< 2% |
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| Iron |
Balance |
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| Microhardness (HV300) |
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| 900 - 1100 kg/mm² |
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| Wear Resistance |
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| ASTM G65-04 Procedure B |
| 2,000 cycles mass loss |
0.18 g |
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| Elevated Temperature Erosion |
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Using CFBC boiler bed ash for 3 hours
at 30° & 90° impact angles (α) at 300°C |
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Thickness loss |
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| SHS 7170 HVOF |
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| 1018 steel plate |
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| Bond Strength |
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| ASTM C633-01 Adhesion/Cohesion Bond Strength Test – 40 mils coating glue failure at: |
| 6000 Series Aluminum |
13,000 |
psi |
| 1018 Steel |
13,000 |
psi |
| 316L Stainless Steel |
13,000 |
psi |
| Copper |
11,200 |
psi |
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| Coating Properties |
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| Density (g/cm³) |
7.59 |
| Porosity/Oxides |
< 5% |
| Deposition Efficiency |
50 - 55% |
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| Impact Resistance (Toughness) |
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| Drop Impact Testing |
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No cracking/delamination at 480 in-lbs |
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| Available Powder Cuts |
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SHS7170HV1
atomized powder (+15 / -53 micron)
SHS7170HV2
atomized powder (+10 / -45 micron) |
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| Packaging |
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| 10 lb and 25 lb containers |
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Coating Description
SHS 7170 HVOF is an iron based steel alloy with a nanoscale microstructure that features good combined wear, abrasion, impact and corrosion resistance with superior bond strength on many materials.
Key Performance Characteristics |
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Excels in high sulfur and elevated temperature environments where fly-ash and bed-ash erosion occurs |
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Very high bond strength across a range of substrate materials, including aluminum, copper, carbon steel and stainless steel |
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Cost-effective option for rebuilding worn out industrial components and parts |
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Alternative to nickel based alloys for corrosion resistance |
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Can be finished to very high surface specifications |
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SHS 7170 HVOF coatings exhibit combinations of good corrosion and wear resistance, high impact resistance and superior bond strength. SHS 7170 is especially resistant to elevated temperature sulfidation attack and is widely used for elevated temperature erosion/corrosion protection of heat exchange tubes in coal fired boilers. SHS 7170 can be used for very high specification surface finishes. Superior bond strength values signify that this material has exceptional adhesion and cohesion. High adhesion values highlight the extremely low residual stress (even at high thicknesses), an inherent factor in coatings of this type. High cohesion values mean that the probability of “pull-out” of individual particles during wear, erosion and other service conditions is extremely low. Low porosity means low coating permeability, resulting in a highly corrosion resistant barrier.
High Temperature Erosion Resistance
By offering a combination of high hardness and corrosion resistance in elevated temperature and high sulfur environments where fly-ash and bed-ash erosion occurs in coal fired boilers, SHS 7170 HVOF coatings are superior to nickel based superalloys and other coating materials for power generation industry applications. In laboratory tests measuring elevated temperature erosion using bed ash from a CFCB boiler to simulate real-world operating conditions, SHS 7170 HVOF coatings lasted 5 to 15 times longer than 1018 wrought steel plate depending on the angle of impingement.
High Bond Strength
When sprayed directly onto a substrate using conventional preparation practices and without a bond coat, SHS 7170 HVOF coatings feature very high bond strength with exceptional adhesion and cohesion. In ASTM C633-01 adhesion and cohesion strength tests, SHS 7170 HVOF coatings demonstrated very high bond strengths when sprayed at a high thickness of 40 mils on plain carbon steel, stainless steel, aluminum and copper substrates.
Spray Parameters
For SHS 7170 HVOF spray parameters, contact NanoSteel at 1-877-293-NANO or info@nanosteelco.com.
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SHS Products 
SHS 7170 HVOF
