Low-pressure process control
Program boost and diffusion stages to establish the surface-carbon level and effective case depth your components require.
Low-pressure carburizing and quenching platform
A configured vacuum carburizing platform for repeatable low-pressure carburizing, carbonitriding and heat-treatment cycles, with gas-quench or double-chamber oil-quench cooling selected around your alloy, part geometry and production target.
Process control
Low-pressure carburizing gives manufacturers a clean, repeatable route to a hard wear surface and a tough core. With controlled boost and diffusion stages, the process supports uniform case development across complex part features, followed by the quench method best suited to the steel and geometry.
Program boost and diffusion stages to establish the surface-carbon level and effective case depth your components require.
Select high-pressure gas cooling or a double-chamber oil-quench configuration against hardenability, distortion target, load mass and throughput.
Link vacuum, gas supply, thermal recipe, cooling and interlocks into a controlled sequence that can be reviewed with your acceptance criteria.
Application fit
This platform is ideal for gears, shafts, transmission components, fasteners, bearing-related parts and other high-value workpieces made from carburizing, oil-hardening or air-hardening steels. It is especially effective for blind holes, narrow slots and detailed geometries that challenge conventional atmosphere processing.
System routes
Gas quenching provides a clean, controlled cooling path for parts where dimensional stability is important. A double-chamber oil-quench system provides a powerful alternative for steels and loads that benefit from oil quenching. For gas selection criteria, read nitrogen vs argon for vacuum gas quenching.
High-pressure gas cooling combines clean handling with a controlled cooling profile. Pressure options from 6 to 16 bar support a wide range of hardening duties.
A dedicated oil-quench chamber delivers an efficient high-intensity cooling route for demanding steel grades, larger loads and production cycles.
Process engineering
SYNHTE integrates low-pressure carburizing, programmed enrichment and diffusion, automatic sequence control and the selected quench route into one production platform. The result is a repeatable process built around your alloy, geometry, load pattern and acceptance standard.
Control temperature, pressure, gas dosing and diffusion time to build the required surface-carbon profile and effective case depth from load to load.
Vacuum operation supports elevated carburizing temperatures that can shorten deep-case cycles when the steel grade, grain control and part requirements allow.
An oxygen-free low-pressure environment helps prevent intergranular oxidation and supports a clean surface with a consistent carburized-layer interface.
Acetylene-based low-pressure carburizing supports carbon transfer into narrow slots, blind holes, threaded passages and densely arranged production loads.
High-pressure gas or double-chamber oil quenching is selected around hardenability, section size, distortion target, load mass and throughput.
Recipe execution coordinates heating, vacuum, process gas, transfer, cooling and interlocking alarms for consistent operation and equipment protection.
Representative applications
From recessed threaded components to heavy gears and precision stainless-steel parts, the process route is configured around material response, case-depth profile, dimensional limits and production loading.
Furnace range
The FZSC2 platform scales from compact precision batches to large industrial loads. Common furnace performance is combined with gas-quench or double-chamber oil-quench configurations selected around the steel, geometry and production target.
For clean handling, programmable cooling and distortion-sensitive production.
For alloys, sections and larger loads that benefit from oil-quench severity.
Loading capacity
Loading capacity
Loading capacity
Loading capacity
Loading capacity
Process performance
Vacuum carburizing can operate at elevated process temperatures when the steel and acceptance requirements permit. Faster carbon diffusion can reduce carburizing time, with the final cycle engineered around material, target profile, load density and grain-control strategy.
Representative carburizing time
Representative carburizing time
Representative carburizing time
In the representative 1.2-1.5 mm case-depth comparison, vacuum carburizing at 1000 C reaches the target in about one quarter of the atmospheric 920 C carburizing time.
Why low-pressure carburizing
Low-pressure carburizing uses an oxygen-free process atmosphere and programmed enrichment-diffusion stages to support uniform case development, repeatable cycles and clean treatment of high-value components.
Vacuum carburizing knowledge
Understand how carbon profiles are built, why quench selection matters and which variables influence case depth, distortion and surface condition.
The workload is heated under vacuum, then alternating enrichment and diffusion stages introduce carbon at the surface and develop the required carbon gradient. The parts are subsequently gas or oil quenched to create a hard case while retaining a tougher core.
Case depth is engineered through the steel grade, carburizing temperature, surface-carbon target, boost and diffusion timing, load arrangement and quench response. Production verification normally uses a hardness traverse and, where required, metallographic examination against the specified acceptance method.
Acetylene-based low-pressure carburizing provides strong carbon transfer and good access to recessed geometries. Proper gas distribution, pulse timing, spacing and fixturing remain important for uniform treatment of blind holes, narrow slots and dense production loads.
High-pressure gas quenching offers clean, adjustable cooling and is often preferred where dimensional control is important. Oil quenching provides higher cooling severity for steels, section sizes or load masses that need it. The final route is selected from hardenability, geometry, hardness target, distortion limit and throughput.
Vacuum heating, uniform loading and controllable gas-quench pressure can improve repeatability and reduce distortion compared with less controlled routes. Final movement still depends on steel condition, prior machining stress, geometry, fixturing, temperature uniformity and cooling intensity.
Low-pressure carburizing is performed without the oxygen-bearing atmosphere used by conventional carburizing, so intergranular oxidation is avoided during carbon enrichment. This supports a clean surface and a regular interface between the carburized layer and the base material.
Higher temperature accelerates carbon diffusion and can shorten deep-case cycles, but it must be compatible with the steel, grain-growth control, dimensional requirements and acceptance standard. The optimum recipe balances cycle time with metallurgical and dimensional performance.
The most useful starting data are the steel grade, part drawing, target effective case depth and hardness, allowable distortion, batch envelope and mass, annual throughput, preferred quench route and applicable inspection standard.
Related solutions
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Selection guideCompare chamber size, temperature, vacuum, cooling and automation.
Technical consultationSend your steel grade, case-depth target, load and throughput for a tailored recommendation.
Built around your process
Tell us about your parts, materials, case-depth target, batch load and production capacity. SYNHTE will recommend a vacuum carburizing furnace built for your application.