Jilin Jiuzheng Industrial Equipment Manufacturing Co., Ltd

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    Typical process

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    Typical process

    1. Controlled-atmosphere carburizing process

    The process involves using a heat-absorbing protective atmosphere (produced by the reaction between air and natural gas) mixed with a carburizing atmosphere (natural gas), and carrying out carburization at 900–950℃. The carbon potential can be automatically controlled, typically around 1.15%, with a control accuracy of up to ±0.05%.
    Its characteristics include: rapid carburizing rate, uniform depth of the carburized layer, consistent hardness and microstructure throughout the parts; the hardness variation among parts in the same batch can be as low as ±1.5 HRC. Furthermore, the sealed quenching process ensures that the surface remains free from decarburization and oxide scale.
    Typical parts: automotive rear-axle gears, automotive transmission gears, automotive steering gear gears, and more.

    2. Quenching under pressure process

    A quenching heat treatment process in which steel is heated to an appropriate temperature and then subjected to the action of a quenching press. This process is commonly used for chassis gears in medium- and heavy-duty vehicles, typically applied to parts that require high load-bearing capacity and minimal deformation, either to prevent deformation or to correct existing deformations.
    Typical part: Chassis gear

    3. Gas Soft Nitriding Process

    It is carried out at 500–600℃ using a heat-absorbing protective atmosphere (formed by the reaction of air and natural gas) mixed with ammonia.
    Its characteristics include: uniform case depth; a uniform and continuous compound layer, which can reach over 0.006 mm; and minimal post-heat deformation.
    Typical parts: car hub gears, shock absorber rods, engine gears, etc.

    4. Tempering Process

    Our company offers both oxidizing and non-oxidizing quenching services for parts. Non-oxidizing quenching is performed in a protective atmosphere, ensuring that the part surfaces remain free from oxidation and decarburization.
    The characteristics of the tempering process are: uniform hardness and uniform microstructure.
    Typical parts: automotive half-shafts, tow hooks, torsion bars, various gaskets, and more.

    5. Carbon-nitrogen co-diffusion process

    A heat-absorbing protective atmosphere (produced by the reaction of air and natural gas) is used in combination with natural gas and ammonia.
    Its characteristics are: rapid penetration rate, uniform depth of the part layer, hardness, and microstructure.
    Typical part: Separating fork for automobiles.

    6. Diffusion-enhancing process

    Dropping an organic catalytic agent into the carburizing atmosphere not only promotes the decomposition of the carbon-rich components but also activates the phase interface, thereby shortening the carburizing cycle.
    Its characteristics include: lower traditional carburizing temperatures and shorter processing cycles, which extend equipment lifespan, minimize part deformation, ensure uniform carburized layers on the part surface, and facilitate the formation of finely dispersed microcarbides, thereby enhancing the wear resistance of the parts.
    Typical parts: car rear-axle gears, car transmission gears, car steering gear gears, and other car parts that have undergone carburizing treatment.

    7. Annealing Process

    The heat treatment process in which steel is heated to an appropriate temperature, held at that temperature for a specified period, and then slowly cooled—typically by allowing it to cool along with the furnace. Common annealing methods include full annealing, spheroidizing annealing, and stress-relief annealing, among others.
    Typical part: Steering arm shaft

    8. Anti-seepage technology

    Through certain physical or chemical methods, during the carbon or nitrogen渗 (case hardening) process of steel, a localized heat treatment process is employed to prevent carbon or nitrogen penetration in specific areas of the steel. For example, the threaded sections of chassis gear components can be reinforced by inserting bolts, thereby preventing carbon penetration into the threads. Similarly, the threaded portions of steering arm shafts can be coated with anti-permeation agents to inhibit carbon penetration. Such anti-permeation techniques are commonly applied to areas where carbon or nitrogen penetration is not required.
    Typical parts: chassis gears, steering arm shaft.

    9. Ion Soft Nitriding Process

    Ion nitriding is a surface chemical heat treatment process in which nitrogen is diffused into the workpiece (cathode) by means of glow discharge generated between the workpiece and the furnace body (anode) under low vacuum conditions (≤2,000 Pa). The duration of ion nitriding is one-third to one-fifth of that required for conventional gas nitriding, and its energy consumption ranges from 40% to 70% of that for gas nitriding, with minimal part distortion. As a completely new nitriding method, ion nitriding has now been widely adopted in many fields, including automotive, machinery, precision instruments, extrusion molding machines, and dies, and its application scope continues to expand steadily.

    10. Stress peening process

    In a specially designed shot peening machine, the workpiece not only undergoes circumferential motion on the turntable but also rotates around its own axis while held in the fixture. Compared to conventional shot peening, this method ensures a more uniform impact of the steel shots on the workpiece. Its key feature is that the surface of the workpiece can achieve a higher and more uniform layer of compressive stress, thereby extending its service life.

    Typical parts: automotive main and driven bevel gears.

    11. Isothermal Normalizing Process

    The workpiece is heated to a predetermined temperature and held at that temperature for a sufficient duration. It is then rapidly cooled to a predetermined temperature in a specialized controlled-cooling device, where it is held isothermally at this temperature to form P+F.
    Its characteristics include: the ability to obtain a uniform fine-grained P+F microstructure with minimal hardness variation. It can prevent the formation of bainitic structures, improve machining accuracy, and reduce deformation during final heat treatment.
    Typical workpieces: Automotive and motorcycle gears that require high machining accuracy and minimal deformation.

    12. Electro-galvanizing

    The process of using electrolysis to form a uniform, dense, and well-bonded metallic or alloy deposit on the surface of a workpiece. Compared with other metals, zinc is relatively inexpensive and easy to plate; it serves as a low-value anti-corrosion electroplating layer widely used to protect steel components—particularly against atmospheric corrosion—and also for decorative purposes. Plating techniques include tank plating (or rack plating), barrel plating (suitable for small parts), automatic plating, and continuous plating (ideal for wires and strips).

    13. Electroplated copper:

    The copper plating serves two main purposes: One is full-board electroplating of copper, which protects the thin chemically deposited copper layer and prevents it from being corroded by acids after oxidation. This process thickens the copper to a specified thickness—typically 5 µm to 8 µm—and is also referred to as “primary copper.” The other is patterned electroplating of copper, used to increase the thickness of via copper and circuit copper to a specific level or as a base layer for nickel plating; the typical thickness in this case ranges from 20 µm to 25 µm.

    14. Electroplating cadmium:

    The type of plating bath is selected based on the shape of the part to be plated, the requirements for the coating, and the uniformity of the plating bath. Currently, the most commonly used cadmium-plating processes in domestic production include: ammoniacal carboxylate complexing cadmium plating, acidic sulfate cadmium plating, and cyanide cadmium plating. Cadmium coatings are often used for the protection of components in aerospace, aviation, radio, and electronic products.

    15. Tin plating:

    In adjusting the oxygen injection rate to control the generation rate of tin ions, it first calculates the time-varying rate at which the predetermined consumption of tin ions changes based on the progress of the substrate passing through the process. Then, according to this time-varying rate of predetermined tin-ion consumption, the tin-ion generation rate is divided at predetermined intervals. The averaged tin-ion generation rate within each interval is set as the average time-varying rate. Finally, in the third process, the oxygen injection rate is adjusted so that the tin-ion concentration, corresponding to the average time-varying rate, remains within the upper and lower control limits for each interval.

    16. Chrome plating:

    The surface is smooth, glossy, and easy to demold, ensuring that the finished products have a flawless, even finish. It is completely rust-free—there won’t be even the slightest trace of rust. During the plating process, the original parts experience minimal deformation. After chrome plating, the surface hardness is significantly enhanced (above HR65), and the coating exhibits excellent resistance to high temperatures up to 500°C, as well as superior corrosion resistance, acid resistance, and wear resistance. If the part dimensions are slightly off, they can be adjusted by adding a few microns of chromium to achieve the required specifications. Based on the specific characteristics of the product, this process delivers both visual appeal and a three-dimensional effect, guaranteeing consistently high-quality surface finishes.

    17. Silver plating:

    This coating is used to prevent corrosion, enhance electrical conductivity, improve reflectivity, and enhance aesthetic appeal. Silver plating, which is widely used, is easy to polish, boasts excellent reflectivity, and exhibits good thermal conductivity, electrical conductivity, and solderability. Silver plating was first applied in decorative contexts and is now extensively utilized in the manufacturing industries for appliances, instruments, meters, and lighting fixtures.

    18. (Blackening):

    Bluing of steel, also known as blackening, can be categorized into high-temperature bluing and room-temperature bluing. High-temperature bluing involves immersing steel parts into a concentrated sodium hydroxide solution and subjecting them to high-temperature treatment at 100°C. The primary component of the bluing film is magnetic iron oxide (Fe). 3 O 4 )

    19. Phosphating:

    It is a process in which a chemical and electrochemical reaction forms a phosphate conversion coating. The phosphate conversion coating thus produced is referred to as a phosphating film. The primary purposes of phosphating are: providing protective coverage for the base metal, thereby preventing corrosion to some extent; serving as a primer before painting, enhancing the adhesion and corrosion resistance of the paint film; and acting as a friction-reducing lubricant in cold-metalworking processes. Phosphating technology has been applied in industry for over 90 years and can roughly be divided into three distinct periods: the period of laying the foundation for phosphating technology, the period of rapid development of phosphating technology, and the period of widespread application.

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