大洋金属工業 List of Products and Services

Due to slight expansion caused by thermal stress and the intrusion and diffusion of nitrogen, a dimensional increase of approximately 0.015 to 0.20 mm occurs on one side. The related links below introduce the causes of deformation and prevention methods, as well as issues such as insufficient hardness and temper brittleness. Please take a look. 【Contents】 ■1. Deformation ■2. Insufficient hardness ■3. Nitrogen unevenness ■4. Insufficient nitrided layer ■5. Delamination of the nitrided layer ■6. Decrease in internal hardness ■7. Temper brittleness *For more details, please refer to the related links or feel free to contact us.

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The causes of quenching distortion are the same as those during normal heat treatment. However, flame hardening is a surface hardening process and may also involve partial hardening, resulting in less distortion compared to conventional quenching, which heats and cools the entire piece, but it is not nonexistent. The related links below introduce measures to suppress this, as well as information on cracking, warping, and temper brittleness. Please take a look. 【Contents (partial)】 ■1. Quenching distortion ■2. Cracking ■3. Warping ■4. Insufficient hardened layer ■5. Melting *For more details, please refer to the related links or feel free to contact us.

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Common defects that can occur during high-frequency hardening include cracking, melting, distortion, poor hardness, and inadequate hardened layer depth. The related links below provide information on the types of defects, their causes, and countermeasures. Additionally, a table summarizing the types and causes of defects is also included, so please take a look. [Contents] 1. Types of defects and their causes 2. Causes of defects and countermeasures *For more details, please refer to the related links or feel free to contact us.

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Steel materials can develop various defects due to gases and impurities contained in molten steel, as well as due to conditions during the solidification process. Furthermore, defects can also occur during various subsequent processing and stages. The related links below provide a detailed overview of these defects. Please take a look. 【Contents】 ■6.4.1 Macrostructure ■6.4.2 Non-metallic inclusions ■6.4.3 Segregation ■6.4.4 Surface defects, internal defects ■6.4.5 Residual stress *For more details, please refer to the related links or feel free to contact us.

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Heat treatment is a process primarily performed on metal materials, involving heating, cooling, and atmosphere to change the properties of the material. However, there are also heat treatments for the material itself and surface heat treatments, and with so many types available, it can be confusing, can't it? Particularly when issues arise from heat treatment, it can become even more troubling. Additionally, the choice of heat treatment method significantly impacts not only the strength of the components but also the product cost. Our company offers proposals for suitable heat treatment methods and consulting for problem-solving. Please feel free to contact us. *For more details, please refer to the related links or feel free to reach out to us.*

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"Plasma nitriding" is a non-combustion heat treatment process where a glow discharge is generated by using the furnace body as the anode and the product as the cathode in a low-pressure nitrogen gas atmosphere. This process produces a soft light similar to a neon sign that envelops the product, heating it with the strong energy of the ions while simultaneously nitriding it. Additionally, Taiyo Metal Industry has developed a rust-resistant stainless steel called 'TAIYO3S Nite' with a hardened layer of over 800 HV after three years of research and development. Please feel free to contact us when you need assistance. 【Features of Plasma Nitriding (Ion Nitriding) Equipment】 ■ Extremely low distortion due to low-temperature vacuum processing ■ High nitrogen potential allows for the rapid formation of nitrided layers (half the time of gas nitriding) ■ The state of the nitrided layer can be controlled by adjusting the gas ratio, temperature, and time ■ Clean surface condition due to processing in a vacuum ■ Oxide films on gears made of stainless steel, etc., can be removed through pre-treatment in the furnace, allowing for uniform nitriding ■ Nitriding prevention can be achieved simply by covering with soft steel plates *For more details, please refer to the related links or feel free to contact us.

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"High-frequency hardening" utilizes high-frequency induction heating to rapidly heat the surface of the workpiece to the hardening temperature, followed by rapid cooling, creating a hardened layer on the surface that improves wear resistance and enhances mechanical properties. Localized heating allows for relatively easy selection of the depth of the hardened layer based on frequency. Direct heating results in good thermal efficiency and shorter working times. Please feel free to contact us when you need our services. 【Features】 ■ Good thermal efficiency and shorter working time due to direct heating ■ Localized heating allows for relatively easy selection of hardened layer depth based on frequency ■ Rapid heating and cooling processes result in minimal oxidation, decarburization, and deformation ■ Rapid heating and cooling generate significant compressive residual stress, improving fatigue strength ■ High surface hardness provides excellent wear resistance ■ Standardization and automation of work processes are easy *For more details, please refer to the related links or feel free to contact us.

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"Flame (Flame Hardening)" is a quenching method that has been used for a long time as one of the surface hardening methods for steel or cast iron. It improves wear resistance, enhances mechanical properties, and allows for partial hardening. Due to rapid heating and rapid cooling treatment, there is little oxidation, decarburization, or deformation, and it is not restricted by the shape or dimensions of the workpiece. Please feel free to contact us when you need our services. 【Features】 ■ No restrictions on the shape or dimensions of the workpiece ■ Localized heating is possible ■ Setup for hardening is easy and work can be done quickly ■ Selection of the hardened layer range and depth is relatively easy ■ Little oxidation, decarburization, or deformation due to rapid heating and cooling treatment *For more details, please refer to the related links or feel free to contact us.

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This document provides an overview of heat treatment technology offered by the Japan Metal Heat Treatment Association. Metal heat treatment is a processing technology that improves the properties of metal materials through a combination of heating and cooling without changing the shape of the product. Among the metal materials subjected to heat treatment, iron has been the most widely used, and non-ferrous alloys (such as aluminum alloys and titanium alloys) are also subjected to heat treatment. [Contents] ■ Types of metal heat treatment processes - General heat treatment (heat treating the entire product) - Surface heat treatment (heat treating only the surface) ■ Heat-treated products commonly used in automobiles ■ Everyday heat-treated products *For more details, please download the PDF or feel free to contact us.

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