50kW Dual-Zone Interlock Box Tempering Furnace 650℃ for Metal Stress Relief

Our box‑type tempering furnace is batch‑style electric heat‑treatment equipment engineered for tempering, stress‑relieving and post‑quenching tempering of steel fasteners, bearings, automotive components and forged metal parts.

Many tempering furnaces on market suffer inconsistent chamber temperature, hard maintenance, poor door sealing and frequent over‑temperature faults. We solve those pain‑points with dual‑zone interlock temperature control, heavy‑duty SUS304 inner components, swing‑arm tight‑sealing door and pull‑out movable hearth for quick inspection & repair. Max working temperature up to 650℃, furnace temperature uniformity ≤ ±5℃. Non‑standard chamber dimensions are fully customizable as your production requirement.

1.Robust Furnace Body & Movable Hearth for Easy Maintenance

Outer shell constructed with A3 carbon steel plate. Inner lining is pressed from 3 mm perforated SUS304 stainless‑steel sheets. The hearth is fully movable and can be taken out entirely.

→ When heating elements or lining get worn, you do not need to work inside narrow hot chamber; whole hearth can be pulled out for fast replacement, greatly cut downtime & maintenance labor cost.

2.Dual‑Point Interlocking Temperature Control System, Prevent Over‑Temperature & Temperature Deviation

Adopts Japan Fuji temperature controller, solid‑state relay + Chint low‑voltage electric components. Built‑in holding timer and over‑temperature alarm function. Two independent temperature control zones work with mutual inhibition during tempering soaking stage.

→ Buyer benefit: Eliminates local over‑heating or temperature drift; keeps consistent temperature across all zones inside chamber, ensures repeatable workpiece hardness quality batch‑after‑batch.

3.Swing‑Arm Compression Furnace Door, Reliable Sealing & Stable Air Circulation

Swing‑arm hinged door presses tightly against furnace frame when closed. Zero obvious air leakage around door gap.

→ Preserves internal hot‑air circulation efficiency; avoids cold‑air ingress which causes local cold spot and bad tempering effect.

4.Heavy‑Duty Centrifugal Cooling Circulation Fan for Superior Temperature Uniformity

Equipped with high‑power forced‑air centrifugal fan. Fan shaft & blades are made of heat‑resistant SUS304S material. Fan diameter: 420 mm. Extended‑length shaft design reduces high‑temperature deformation risk.

→ Powerful hot‑air mixing, realizes furnace uniformity ≤ ±5℃. Fan parts resist long‑time high‑temperature oxidation, extend service life of circulation system.

5.Spiral Heating Elements Multi‑Sided Arrangement, Simple Replacement

OCr21Al6 spiral resistance heating wires are arranged on front, rear, left and right sides inside furnace. Modular installation design for quick disassembly & replacement.

→ Multi‑sided heating layout delivers even heat radiation; heating wire can be swapped out without specialized welding work, reduce spare‑part replacement difficulty.

1. Automotive spare parts: bolts, shafts, gears, suspension components

2. Fastener & hardware: screws, nuts, stamped parts after quenching

3. Bearing industry: bearing rings, rollers

4. Forging & casting parts tempering and stress‑relief

5. General metal workshop batch tempering heat‑treatment

Q1: Is temperature uniformity ±5℃ guaranteed for full chamber?

A: Yes. Dual‑zone interlock control + large‑diameter SUS304 circulation fan ensure ≤±5℃ temperature spread inside effective working zone under soaking condition.

Q2: How hard is maintenance?

A: Movable pull‑out hearth allows easy access to heating wires and lining. Spiral heating elements are plug‑in style for fast replacement, no complicated onsite welding.

Q3: Can you customize chamber dimension for my workpiece size?

A: Fully custom service. Send us your required inner chamber W×H×L, max loading weight and target tempering process, we provide tailored drawing & quotation.

Q4: What about spare‑part supply after delivery?

A: Rexin Machinery provides long‑term spare‑parts supply: thermocouples, heating wires, fan blades, sealing gaskets, control instruments. We offer installation guidance online.

1. Direct heat‑treatment furnace manufacturer, no middle‑man markup

2. All core components parameters traceable; we can supply component certificates upon request

3. Custom‑engineered solution for tempering process requirement

4. Complete documentation: operation manual, electrical drawing, spare‑part list

5. Overseas after‑sales remote guidance service