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Corrosion-Resistant Steels and Alloys

Powder AP-FeCr13

Application

Powders are produced by means of molten metal gas spraying, high-pressure water spraying and calcium hydride reduction of mixed metal oxides.

Gas-sprayed powders are characterized by spherical particles and good fluidity. These are applied for deposition of corrosion- and wear-resistant coatings onto parts of machines and equipment using the methods of plasma-jet hard-facing and laser building-up, gas-dynamic and plasma spraying. Coating material selection is determined by the purpose of corrosion protection and achievement of specific properties for surfaces of machine and equipment parts, as well as by the method of hardsurfacing overlay application. For example, AP-FeCr19Ni9Si5Mo4NV powder is used for wear-resistant coatings operating in aggressive environments at elevated temperatures, while AP-FeCr19Ni11Mo2  is used for anti-friction and corrosion-resistant coatings.

Water-reduced and water-sprayed powders are characterized by irregular or round shape of particles. These are applied for production of permeable materials (filters) and corrosion-resistant structural parts. AP-FeCr18Ni9MoCuSi water-sprayed powder was specifically developed for molten polyester resin filtering.

Reduced nichrome powder Ni80Cr20 of 40-100 microns fraction is also applied for plasma coatings in aircraft motor industry.

ATTENTION, NOVELTY! A separate group is composed of stainless steel powders to be used for build-up welding of erosion-resistant coatings onto power equipment valving parts. These innovative powder materials were  specifically developed in lieu of the electrodes being used as coating materials in valving production and repair.

Powder grades and properties

Name, grade, base grains Nominal composition %
F? ?r Ni Si ?? Al Other
Ni Al5 powder AP-NiAl5 alloy gas-sprayed -40, 11-53, 40-100, 40-125, 45-106 miccrons ≤1,0 - base - - 5  ?≤0,05                                                  Si, Fe, Mn≤1 each
Stainless steel powder AP-FeCr18Ni9 gas-sprayed -40, 20-63, 40-100, 90-160 miccrons base 18 9 - - - ? ≤0,12
Stainless steel powder RP-FeCr18Ni9Ti reduced
-56 packed density  2,2-3,0 g/cm3
-160 packed density 2,0-2,6 g/cm3
-280 packed density 1,7-2,6 g/cm3
base 18 9 - - - ?0,08 Ti0,8 ?≤0,35 S≤0,02 ??≤0,15

 

Stainless steel powder RP-FeCr18Ni15 reduced
-56 packed density 1,9-2,5 g/cm3
-160
packed density 1,8-2,5 (3,0) g/cm3
-280 packed density 1,7-2,5 g/cm3
base 18 15 - - - ?≤0,08 O≤0,30 S≤0,015 Ca≤0,15
Stainless steel powder RP-FeCr17Ni2 reduced
-56 packed density 2,2-3,0 g/cm3
-160 packed density 2,0-2,6 g/cm3
-280 packed density 1,7-2,6 g/cm3
base 17 2 - - - ?≤0,35  S≤0,02  ??≤0,20  C0,12
Stainless steel powder RP-FeCr23Ni18 reduced
-56 packed density 2,2-3,0 g/cm3
-160 packed density 2,0-2,6 g/cm3
-280 packed density 1,7-2,6 g/cm3
base 23 18 - - - ?≤0,08 ?≤0,30 S≤0,02 ??≤0,15
Stainless steel powder RP-FeCr13Mo2 reduced
-160 packed density 2,1-2,45 g/cm3
-280 packed density 2,0-2,6 g/cm3
base 13 - - 2 - ?≤0,08 ?≤0,50 S≤0,02 ??≤0,20
Nichrome powder Ni80Cr20
AP-Cr20Ni80 (Nitrogen atomization)
AP-Cr20Ni80 (Water atomization)
-40, 20-63, 40-100, 80-160 microns
≤1,0 20,5 base - - -  Si≤ 0,5 ?≤0,05                                      ?, Mn≤0,1 each
Nichrome powder Ni80Cr20
RP-Cr20Ni80 reduced
-160 packed density 2,0-2,6 g/cm3
-280 packed density 1,7-2,6 g/cm3
- 20 base - - - ?≤0,06 ?≤0,30 S ≤0,01 ??≤0,20
Nichrome powder Ni60Cr40
RP-Cr40Ni60 reduced
- 40 base - - - ? ≤0,06 S ≤0,02 ?? ≤0,20
Powder of FeCr30 alloy
RP-FeCr30 reduced
-56 packed density 2,2-3,0 g/cm3
-160 packed density 2,0-2,6 g/cm3
-280 packed density 1,7-2,6 g/cm3
base 30 ≤0,30 - - - ?≤0,30 ?≤0,30 S ≤0,01 ??≤0,20
Stainless steel powder
AP-FeCr17Ni12Mo3 gas-sprayed
11-53, 45-106 microns
base 17 12 - 2,5 <0,6 Mn≤0,8 ?≤0,1
Stainless steel powder
AP-FeCr19Ni9Si5Mo4NV gas-sprayed
80-200 microns
base 19 9 - 4,5 - N, Si, ?n, V                                       ?≤0,08
Stainless steel powder
AP-FeCr19Ni11Mo2 gas-sprayed
-40, 40-100, 80-400, 100-280 microns
base 19 11 - 2,5 - ?≤0,08 ?≤0,05 ?n1,5
Stainless steel powder
AP-FeCr20Ni2 gas-sprayed
-40, 20-63, 40-100, 80-200 microns
base 13 2,2 - - - ?n0,8 ?0,2
Stainless steel powder AP-FeCr13 gas-sprayed
-40, 20-63, 40-100, 80-200 microns
base 13 - - - - ?0,3  Ni≤0,6  Si≤0,8  ?n≤0,8   Ti≤0,2  Cu≤0,3  S≤0,025   P≤0,03
Stainless steel powder
AP-FeCr18Ni9MoCuSi water-sprayed
630-2000, 630-2500 miccrons
base 18 9,5 0,8 0,9 - Cu0,9 ?≤0,12 ?≤ 0,45

Novelty Powder Materials to be Used in Production and Repair of Power Equipment Valving Parts

Application

Powders of erosion-resistant AP-FeCr17Ni8Si6Mn (ZN-6L) and AP-FeCr18Ni9Mo5Si5Mn4Nb (ZN-12M)  alloys were developed for high-performance and high-quality plasma-jet hard-facing of wear-resistant coatings onto sealing surfaces of power equipment valving parts  in lieu of the coating electrodes well-known in the valving industry. Put in the brackets of powder grade designations are the grades of coating electrodes as per GOST 10051 used for build-up welding of layers of similar composition.

Innovative powdery coating materials were developed jointly with State Scientific Center of the Russian Federation – Open Joint-Stock Company “Research and Production Association CNIITMASH”, being now manufactured pursuant to the technical specifications approved by the Institute of Welding and Control (State Research Center).

 Powders are characterized by spherical particles and good fluidity.

Post-heat treatment hardness of weld metal:

AP-FeCr17Ni8Si6Mn (ZN-6L) ………………30-39 HRC;

AP-FeCr17Ni8Si6Mn (ZN-12M)  ……40-51 HRC.

Build-up welding is performed with pre-heating of parts at 350 °? and subsequent heat treatment following the build-up welding:

for austenic steels – tempering at 860 °?, 2 hours, with retarded cooling;

for carbon steels – tempering at 640 °?, 2 hours, with retarded cooling.

Powders developed for special application:

Name, grade, base grains Nominal composition %
F? ?r Ni Si ?? Al Other
AP-FeCr17Ni8Si6Mn (ZN-6L) gas-sprayed powders 63-125 miccrons base 17 8 6 - - ?0,08 Mn1 Co≤0,2 S≤0,025 P≤0,03 O≤0,08 N≤0,09
AP-FeCr18Ni9Mo5Si5Mn4Nb (ZN-12M) gas-sprayed powders 63-125 miccrons base 18 9 5 5 - ?0,10 Mn4 Nb1 Co≤0,2 S≤0,025 P≤0,03 O≤0,08 N≤0,09