Controlled Atmosphere Box Quenching Furnace Anti-Oxidation Bright Hardening Furnace

What Is Box Type Quenching Furnace?

Different from standard open-type box quenching furnaces, this atmosphere-controlled hardening furnace adopts fully sealed furnace cavity and automatic protective atmosphere distribution system. It fills the chamber with nitrogen-hydrogen mixed gas before heating, isolating air contact with workpieces all the time, to eliminate surface oxidation, decarburization and black scale after quenching.

It is specially designed for precision metal components with strict surface appearance requirements, avoiding post-processing polishing cost caused by oxide layers. The independent atmosphere circulation pipeline maintains stable gas concentration inside the furnace, suitable for medium batch precision hardware continuous heat treatment.

After loading workpieces, close the sealed lift door, exhaust air inside the furnace cavity first, then inject mixed nitrogen-hydrogen protective gas to fill the whole chamber. The heating system heats up to target quenching temperature under isolated air environment, then finish holding and quenching. The protective gas blocks chemical reaction between metal and oxygen, so parts retain bright finish without oxidation.

1. Side-Open Box Quenching Furnace Front door loading & unloading, external quenching tank. Suitable for small-batch molds and single parts with low cost.

2. Bottom Drop Rapid Box Quenching Furnace The furnace bottom automatically descends and submerges into the quenching tank. Transfer time ≤30 seconds to avoid workpiece temperature drop and decarburization. Designed for precision alloy steel and aerospace components.

3. Trolley-Type Box Quenching Furnace Equipped with automatic loading/unloading trolley, specially for heavy-tonnage forgings, flanges and shaft parts.

4. Controlled Atmosphere Box Quenching Furnace Filled with nitrogen or methanol cracking gas for oxidation-free bright quenching. Ideal for automotive fasteners and gears.

5. Vacuum Box Quenching Furnace Sealed vacuum environment realizes zero oxidation and ultra-smooth surface finish. Applied to high-end molds and aerospace precision components

1. Fully Sealed Anti-Leakage Furnace Cavity Multi-layer high-temperature graphite sealing strips are installed on furnace door and all pipeline joints, effectively preventing air infiltration to guarantee bright workpiece surface.

2. Automatic Mixed Protective Atmosphere System Equipped with flow control meter for nitrogen and hydrogen, real-time gas concentration monitoring, automatic gas supplement without manual adjustment.

3. Zero Oxidation & Zero Decarburization Hardening Effect Workpieces keep original metallic luster after quenching, no rust scale, save polishing & cleaning post-process cost.

4. Independent Atmosphere Circulation Fan Built-in high-temperature circulation fan evenly distributes protective gas in all corners of the chamber, uniform atmosphere concentration without local oxidation dead zone.

1. Furnace Body: Thick steel plate & section steel welded shell, anti-rust coating

2. Insulation Lining: High-temperature resistant ceramic fiber module, light weight & shock resistance

3. Heating Element: OCr27Al7Mo2 high-resistance alloy strip, long service life

4. Furnace Door: Electric lifting / swing door with double-layer sealing to avoid heat leakage

5. Control Cabinet: PLC + PID intelligent temperature controller, S-type thermocouple

6. Quenching System: Separate oil/water quenching tank with circulation cooling device

7. Atmosphere System (Optional): Methanol cracking, nitrogen input, carbon potential precise control

8. Vacuum System (Optional): Vacuum pump unit for bright vacuum quenching

1. Sealing Material: High temperature graphite composite sealing strip

2. Supporting Atmosphere: Nitrogen, hydrogen, mixed protective gas

3. Atmosphere Control: Automatic flow adjustment + real-time concentration detection

4. Temperature Uniformity: ±5℃ inside sealed cavity

5. Furnace Structure: Integrated airtight furnace frame, anti-gas leakage design

1. Precision stainless steel fastener bright quenching

2. Medical hardware fittings heat treatment

3. Small precision mold inserts bright hardening

4. Electronic conductive metal parts non-oxidation quenching

5. Mirror surface alloy component heat treatment

Q1: What parts need atmosphere bright quenching furnace instead of standard box furnace?

A: Products requiring mirror/bright surface without post polishing, such as stainless steel fasteners, medical precision parts; standard furnaces will form black oxide scale on workpiece surface.

Q2: Is the atmosphere system difficult to operate?

A: Fully automatic gas supply and monitoring system, only need to set gas flow parameters on PLC panel, no professional gas operation skills required.