Continuous Nitrocarburising Furnaces

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CONTINUOUS NITROCARBURISING FURNACES

with

NITRIDING POTENTIAL CONTROL

continuous-nitrocarburising-furnaces

THE FLUIDTHERM CONTINUOUS NITROCARBURISING FURNACE
with POST OXIDATION

post-oxidation

Capacity : 300 Kg/hr

Continuous Pusher Nitrocarburising Furnace

continuous-pusher

Continuous Nitriding Furnace for stainless steel parts

continuous-nitriding-furnace

Typical Applications

# Product Material Process
1 Brake Caliper Piston Low carbon steel FNC + POST Oxidation
2 Electrical Contacts Low carbon steel Austenitic Nitrocarburizing
3 Engine valves Stainless Steel Surface activation + Nitriding
4 Bearing cages Low carbon steel FNC + POST Oxidation
5 Hydraulic Jack-Screw rods SG IRON FNC
6 Piston rings Low Carbon Steel Surface activation + Nitriding
7 Lever guides High Carbon Steel FNC
8 Ring travellers Stainless Steel FNC + POST Oxidation

Brake caliper piston

Unalloyed low carbon steel
FNC + POST Oxidation
brake-capiler-piston1
brake-capiler-piston2
brake-capiler-piston3
AFTER OXIDATION

Compound layer depth: 18µ
Oxide layer depth: 4-5 µ
Surface hardness: 645 HV 0.1

brake-capiler-piston4

Hardness Results & Surface roughness

hardness-in-hv
Hardness in HV 0.05
Specification 400 HV 0.05 (minimum)
Maximum 660 HV0.05
Minimum 615 HV0.05
Average 638 HV0.05
surface-roughness
Surface roughness (Ra) in µm
Fresh 0.24-0.28
Nitrocarburized 0.48-0.50
FNC + PostOxidation 0.31 – 0.35

Corrosion Test Report

PROCESS SPECIFICATION (as per standard ASTM B117) BEST RESULT
FNC + Post Oxidation 120 Hours (minimum) 240 Hours

XRD of Compound Layer

xrd-compound-layer

PREDOMINENTLY Ɛ CARBONITRIDES

Electrical Contacts

ANC
low-carbon-steel

Low carbon steel

surface-hardness-675-hv0.1

Surface Hardness: 675 HV0.1
Compound layer depth: 18µm
Austenite layer: 9 µm
Diffusion Layer: 260 µm

Engine valves

Stainless steel (21-4N)
Surface activation + Nitriding
engine-valves1
engine-valves2
White Layer: 1.6-2.0 µm
Case depth: 33-35µm

Piston Rings

High Chromium Stainless steel
Surface activation + Nitriding
piston-ring1
piston-ring2

Thin white layer with diffused nitrogen case
Case depth : 74-76 microns
Surface hardness: 1045 HV0.1
Core hardness : 366 HV0.1
White layer : 4 µ

Bearing Cages

Low carbon steel
FNC + PostOxidation
bearing-cages1
bearing-cages2
bearing-cages3
Surface Hardness : 545 HV0.1
Compound Layer : 8-10 µm
Copper chloride test : 100% OK

Lever guide

High Chromium Stainless steel
Surface activation + Nitriding
lever-guide1
lever-guide2
Surface Hardness: 685 HV0.1
Case Depth: 0.29mm
Compound Layer: 10 µm

Hydraulic jack-Screw rods

SG iron
FNC
inner-screw

Surface Hardness : 925 HV0.1
Compound Layer : 14-16 µm

fnc1
fnc2

Ring travellers

Low carbon steel
FNC
ring-travellers
dump-loaded
Dump Loaded
strecth-test-passed
Surface Hardness : 625 – 640HV
Core Hardness : 415HV
Compound Layer : 7-8 µm
Diffusion Layer : 50 – 55µm