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QPQ Salt Bath Heat Treatment Furnace

QPQ Salt Bath Nitriding Heat Treatment Furnace

COOLDO QPQ Salt Bath Heat Treatment Furnace is suitable for various structural steels, tool steels, heat-resistant stainless steels, pure iron, cast iron, and various powder metallurgy parts. It is also suitable for various working environments with high wear resistance, high corrosion resistance, fatigue resistance, and micro deformation, and is widely used in industries such as automobiles, motorcycles, locomotives, engineering machinery, agricultural machinery, light chemical machinery, machine tools, instruments and meters, firearms, gears, and molds.

Features

1. Good wear resistance and fatigue resistance
2. Good corrosion resistance
3. Minimal deformation
4. It can replace multiple processes and reduce time costs
5. Low carbon and environmentally friendly

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QPQ

QPQ salt bath nitriding project mainly consists of the following equipment:

1. Preheating furnace: It is mainly used for preheating and tempering of products.

The control system adopts Internet of Things technology, and the equipment can be connected to the computer and mobile phone of the management personnel through the wired network or wireless WIFI in the production workshop. Management personnel can monitor and record the production process in real-time 24 hours a day (temperature records, process pre storage, operation records, scheduled start stop, product power consumption records, etc).

2. Nitriding furnace: It is mainly used for nitriding and carburizing treatment of mechanical products.

3. Oxidation furnace: It is mainly used for oxygen ion infiltration into products.

4. Ultrasonic cleaning machine
5. Rinse tank
6. Cooling tank
7. Water-soluble sealing tank
8. Oil-based sealing tank
9. Tooling fixture
10. Physical and chemical analysis facilities

QPQ furnace

The process steps of QPQ salt bath treatment include cleaning, preheating, nitriding, and oxidation polishing. Firstly, use water-based cleaning agents and ultrasonic waves to clean the dirt on the surface of the workpiece. Then, preheat the workpiece in an air furnace; Next, place the preheated workpiece in a salt bath for processing. Finally, polish the oxidized workpiece.

QPQ is actually a process that combines heat treatment and anti-corrosion treatment in one go. Its main advantages are low processing temperature, short time, and the ability to simultaneously improve the hardness, wear resistance, and corrosion resistance of the part surface, reduce friction coefficient, minimize deformation, and be pollution-free. It has the advantages of optimizing processing procedures, shortening production cycles, and reducing production costs, and has been recognized and praised by many manufacturers worldwide.

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Application

QPQ

The main function of QPQ salt bath furnace is to improve the wear resistance, corrosion resistance, and hardness of workpieces through QPQ salt bath composite treatment technology.

QPQ heat treatment technology applies to a wide range of materials. This process is applicable to all black metal materials, from pure iron, low-carbon steel, structural steel, tool steel to various high alloy steels, stainless steel, cast iron, and iron-based powder metallurgy parts.

The following are examples of the application of QPQ technology on some typical workpieces:

1. High speed steel cutting tools include various HSS drill bits, milling cutters, zippers, and gear cutting tools, which can increase the service life by 1-4 times, especially for difficult to machine materials, the effect is particularly outstanding.

2. The tool holder and blade body of various machine clamps improve their wear resistance, abrasion resistance, non deformation, and meet the requirements of positioning and accuracy well, with strong rust prevention ability.

3. Molds are suitable for various die-casting molds, injection molds, extrusion molds, rubber molds, glass molds, etc., greatly improving the service life of molds and enhancing the surface smoothness of processed parts.

4. Automotive parts such as valves, crankshafts, camshafts, gears, air spring piston rods, shock absorber rods, differential brackets, spherical pins, and dozens of other parts have been applied for many years with significant results.

5. Sports equipment such as golf heads can be directly exported to the European and American markets.

6. Textile machinery is used for the cold and hot tracks of elastic yarn machines to increase hardness and prevent deformation.

7. Switch components are used for various air switch components, replacing galvanizing and chrome plating, with significant effects.

8. Printing machinery, various offset printing machine parts, gears, edge suction nozzles, etc.

9. Seal various valves and shaft components of machinery.

10. Electric tool parts include gear shafts, helical teeth, flat teeth, and bearing housings.

11. Various shafts, pins, gears, and other components of construction machinery.

12. Camera parts such as shutter, lock and other stamped parts.

Parameter

Preheating furnace Nitriding furnace Oxidation furnace
Model CDOCP-80-6 CDONF-100-9 CDOT-100-9
Furnace voltage 380V / 3P / 50Hz 380V / 3P / 50Hz 380V / 3P / 50Hz
Power 80 KW 100 KW 100 KW
Rated temperature 650℃ 950℃ 950℃
Working size Φ1000*1500 mm Φ1000*1500 mm Φ1100*1500 mm
Overall dimensions Φ1800*1800 mm Φ1800*1800 mm Φ1900*1800 mm
Temperature control zones 2 zones 2 zones 2 zones
Temperature control accuracy ±0.5℃ ±2℃ ±2℃
Furnace tank 4mm (304 TISCO) 12mm (316 TISCO) 12mm (304 TISCO)
Temperature control PID PID PID

Features

Feature of QPQ Salt Bath Heat Treatment Furnace:

 

1. Good wear resistance

In the QPQ process, metal materials react with salt bath liquid at a working temperature of 570 ± 10 ℃, forming a high-quality and dense compound layer on the metal surface. This compound is entirely composed of ε – iron nitride, which can efficiently improve the hardness and density of the metal surface, thereby giving the metal surface good wear resistance and reducing the friction coefficient.

2. Good corrosion resistance

The test results show that the corrosion resistance of the parts treated with QPQ is 5 times that of 1Cr18Ni9Ti stainless steel, 70 times that of hard chromium plating, and 280 times that of blackening.

3. Good fatigue resistance

The metal surface treated by QPQ salt bath composite process introduces and generates high residual compressive stress, resulting in greatly improved fatigue strength of various types. It has been proven through experiments that it can improve fatigue strength by about 100% and slow down the occurrence of surface defects such as pitting and corrosion.

4. Minimal deformation

After QPQ treatment, the product will hardly deform, which can effectively solve the problem of hardening deformation that is difficult to solve by conventional heat treatment methods.

5. Low carbon and environmentally friendly

The QPQ treatment process has been tested and identified by relevant environmental protection departments, and has been proven to be pollution-free, non polluting, and free of heavy metals by users across the country. And it is used to replace some heavily polluting processes such as electroplating.

6. It can replace multiple processes and reduce time costs

After being treated with QPQ salt bath composite technology, metal materials not only improve their hardness and wear resistance, but also enhance their corrosion resistance. Therefore, they can replace conventional processes such as quenching (ion nitriding, high-frequency quenching, etc.), tempering, blackening (chrome plating), etc., greatly shortening the production cycle and reducing production costs. A large amount of production data shows that QPQ treatment can save 50% energy compared to carburizing and quenching, and save 30% cost compared to hard chromium plating, with high cost-effectiveness.