Project Background and Core Process Requirements

WONDERY recently delivered an RT-90-9 precision pit-type gas carburizing furnace to a client in Sudan (Mohammed Yousif). The client specializes in the surface carburizing of various small and medium-sized metal parts. Given the high sensitivity of the carburizing process to carbon potential control and atmospheric sealing, the client required a system with high automation and atmosphere circulation stability.

Technical Solutions and Parameterized Evidence

1. Dual-Zone Temperature Control and Forced Circulation (±5 ℃ Uniformity)

To address the vertical temperature gradient common in deep pit furnaces, WONDERY implemented a zoned control strategy:

• Control Architecture: The furnace is divided into 2 independent heating zones.

• Circulation Power: A powerful centrifugal fan integrated into the lid, working with a 310S (0Cr25Ni20) heat-resistant stainless steel muffle, ensures forced atmosphere and thermal flow circulation. This maintains a temperature field uniformity of ±5 ℃ within the working zone.

• High-Precision Instrumentation: The control system utilizes Japanese Shimaden SRS13A industrial PID controllers, achieving an instrument control accuracy of ±1 ℃.

2. Fully Automated Carbon Potential and Process Management

The equipment achieves intelligent control from heating to the completion of carburizing:

• HMI: Equipped with a 10-inch industrial touchscreen that integrates temperature settings, process monitoring, and historical curve storage.

• Atmosphere Regulation: Employs a drip-type atmosphere control system. Media is introduced via precision flowmeters and droppers. The system automatically manages temperature, carbon potential, time, and dripping rates to ensure consistent carburizing layer depth.

3. Reinforced High-Temperature Structure and Sealing

• Muffle Specifications: Features a 310S grade stainless steel muffle designed to withstand the 1100 ℃ design temperature, providing excellent resistance to oxidation and carburizing corrosion.

• Insulation System: The lining combines high-performance lightweight bricks with Shandong Luyang aluminosilicate fiber modules. This configuration minimizes heat loss, with a non-load temperature rise time of ≤1.5 hours.

• Sealing Technology: High-temperature resistant sealing materials are used at the lid-to-body interface to maintain a micro-positive pressure, preventing atmosphere leakage or air infiltration.

4. Safety Protection and Interlock Systems

• Electrical Safety: Includes over-temperature alarms and automatic power cut-off functions; safety interlocks are established between the lid lifting mechanism and the heating power supply.

• Component Optimization: Heating elements made of 0Cr25Al5 high-resistance alloy are secured with high-alumina ceramic screws, extending service life under frequent heat treatment cycles.

Delivery Specifications and Key Parameters

• Effective Working Dimensions: Ø 600 × 1000 mm.

• Rated Power: 80 kW (Dual-zone independent regulation).

• Design Temperature: 1100 ℃.

• Included Components: 310S muffle tank, stainless steel charging basket, automated control cabinet, and a complete dripping system.