Gas Carburizing/Liquid Carburizing Process

Surface Treating Division

Gas Carburizing/Liquid Carburizing Process – ICBP

Low pressure vacuum carburizing


Formation of high tough carburizing layer with free oxides
Quenching with less distortion by high pressure gas or oil, suiting the materials
Case depth formation ensuring the high carbon concentration layer with dispersion of fine spherical carbon
Formation of case dept carburizing layer with toughness, high strength and high tempering resistance
Vacuum refining (Option of high pressure gas quenching or oil quenching)
Vacuum annealing

High concentration carburized structure
High concentration carburizing: The structure of granular carbide (FeCr)3C of 1-2μm dispersed on the martensite base is high resistance to high temperature softenization.
Improvement of resistance to tempering softenization
High temperature rapid carburizing: Possible to make a short time treatment for carburizing at 950-1000℃
High concentration carburized structure

Less internal oxidation: No imperfect quenching (internal oxidation) and external appearance of brilliant color owing to quenching under vacuum
Optical microstructure of low pressure carburizing layer
Optical microstructure of Rx gas carburizing layer
Microstructures of (a) INFRACARB and (b) Gascarburizing process. JIS SCM415, ECD=0.7mm

Gas Carburizing/Liquid Carburizing Process – SP-NITE


Gas nitriding for high alloy steels such as austenite stainless steel, etc. and other materials being hard to treat with nitriding
Treatment obtaining both high hardness and superior ware resistance on stainless steel materials by a long-time and low temperature nitriding.
Low temperature nitriding aiming at holding the material strength.
Automatic operation of ammonium control by analyzing system.
Improvement of no oxidizing atmosphere in furnace or vacuum evacuation or nitrogen purging before treatment.
Cleaning of exhaust gas by gas resolving furnace

Comparison of cross sections structure between SP-NITE Treatment and conventional treatment

Activation of parts by hydro carbon gas (CX gas) in the same furnace
Automatic process control by inputting the treatment pattern

High strong, high wear resistant SP layer on SUS material

Activity of parts by hydro carbon gas (CX gas) in the same furnace
Automatic process control by input of treatment pattern

External appearance before and after low temperature nitriding treatment

Surface observation before and after low temperature nitriding treatment, SEM

Surface roughness before and after low temperature nitriding treatment

Performance test on sample treated with low temperature nitriding process
(surface hardness, cross section structure, wear resistance evaluation)