伸和熱処理 List of Products and Services

Our company performs brazing from prototyping to mass production using methods that involve a torch (burner) or high-purity hydrogen reduction furnaces and vacuum furnaces, depending on the base material, shape, and quantity to be joined. We use brazing materials such as gold, silver, copper, nickel, aluminum, titanium, brass, and bronze, and the joined components can be the same metals like steel, titanium, stainless steel, aluminum, copper, brass, and bronze, or dissimilar metals. We also handle soldering (stainless steel to stainless steel) for small quantities of various types that cannot be automated. 【Features】 ■ We perform brazing using both flux and methods that do not use flux, such as high-purity hydrogen furnaces and vacuum furnaces. ■ We use precious metal brazing materials with poor brazability, such as stainless steel SUS304. ■ We excel in high-precision and high-strength brazing. ■ We develop suitable brazing processes, including brazing materials and methods. *For more details, please refer to the PDF document or feel free to contact us.

• Processing Contract

We would like to introduce our "barrel polishing" services. We primarily handle a large number of small precision parts, and the barrel polishing conditions are naturally set for these small precision components. We own various types of polishing machines and appropriately select them based on the specifications of the parts and the purpose of the barrel. We also have over 30 types of media available, allowing us to make the best selections as needed. **Features of our barrel polishing:** - A significantly high number of small precision parts - Ownership of various polishing machines - Over 30 types of media available *For more details, please refer to the PDF document or feel free to contact us.*

• Processing Contract

The "Parker treatment" involves immersing the treated items in aqueous solutions of zinc phosphate or manganese phosphate for the purpose of rust prevention or as a base for painting. Phosphate ions in the solution react to form a poorly soluble hydrated crystalline film of zinc phosphate or manganese phosphate. Due to our understanding of the material properties and heat treatment, we can provide detailed processing tailored to the specific parts. Please feel free to contact us if you have any requests. 【Features of our phosphate treatment】 ■ A thick film type of zinc phosphate primarily aimed at rust prevention ■ Detailed processing tailored to the specific parts ■ Of course, it also demonstrates excellent effectiveness as a base for painting *For more details, please refer to the PDF document or feel free to contact us.

• Processing Contract

The "black dyeing treatment," also known as "black iron oxide treatment" or "alkaline coloring treatment," involves immersing steel parts in a water solution primarily composed of concentrated caustic soda (NaOH) and boiling it (at 140-150°C) to generate a black Fe3O4 film on the surface. The Fe3O4 film is beautifully black and has better corrosion resistance the thicker it is, but it is generally a porous film about 1-2μ thick. It is used in many parts such as tools for machine tools, camera components, and gun muzzles. **Features of our black dyeing treatment:** - Customers are satisfied with the very beautiful black coloring, which enhances product value. - The degree of coloring varies depending on the material type and heat treatment condition. - Our company specializes in heat treatment, allowing us to understand the material type and heat treatment condition, and select the appropriate treatment method suitable for the material properties. - Once an order is placed, most customers become fixed customers. *For more details, please refer to the PDF document or feel free to contact us.*

• Processing Contract

We would like to introduce our "Vacuum Hardening and Bright Annealing" services. By heating in a vacuum atmosphere, it is possible to heat without oxidation (vacuum is an excellent atmosphere for oxidation-free heat treatment). We typically operate at a vacuum level of 1 to 10^-3 Pa. For high-alloy steels (such as SKD and SKH) with good hardenability, gas hardening is performed by injecting pressurized nitrogen gas from the surroundings, while carbon steels and low-alloy steels (which have lower hardenability) undergo oil hardening. 【Features of Vacuum Hardening】 ■ Materials that can be hardened with slow cooling experience minimal deformation and dimensional changes, and have higher impact values even at the same hardness. ■ Capable of handling small quantities and short delivery times. *For more details, please refer to the PDF document or feel free to contact us.

• Processing Contract

"High-frequency quenching" is a process that involves rapidly heating the surface layer, allowing carbon to dissolve into the base material, maintaining a diffusion holding time of about 1 second, and then spraying a quenching agent to perform surface hardening. This treatment is applied to quenching steels containing more than 0.25% carbon, but generally, low alloy steels such as carbon steels with about 0.4 to 0.5% carbon or Cr-Mo steels with less than 0.4% carbon are commonly used. Please feel free to contact us if you have any requests. 【Features】 ■ Partial hardening is possible ■ High surface hardness, excellent wear resistance, and fatigue strength are achieved ■ High compressive stress on the surface results in excellent fatigue strength ■ Fine microstructure provides excellent ductility, toughness, and fatigue strength ■ The uneven distribution of carbon and alloying elements before hardening tends to reflect in the hardened structure and properties *For more details, please refer to the PDF document or feel free to contact us.

• Processing Contract

Our company provides consistent contract services for salt bath heat treatment and various surface treatments. Since our founding, the strong commitment embedded in our company name has allowed us to grow with the support of over 1,000 customers to this day. As the importance of ensuring high-quality stability is emphasized, we are working to enhance our quality management system and strive to secure greater trust than ever through rationalization via our in-house management system. 【Main Business Activities】 ■ Heat Treatment ■ Surface Treatment ■ Brazing ■ Various Processing *For more details, please refer to the PDF materials or feel free to contact us.

• Processing Contract

Our company offers processing using salt baths and austempering. The advantage of salt baths is their flexibility. Unlike large equipment that requires waiting for a batch to be completed, the ease of adjustment allows for shorter delivery times. Austempering is a type of quenching and tempering that results in less deformation and distortion compared to conventional quenching and tempering. It also has greater toughness and higher impact resistance, so even at the same hardness, the strength is completely different from that of conventional quenching and tempering. 【Features】 ■ Same-day response available ■ Salt bath: Achieves short delivery times with ease of adjustment ■ Salt bath: Can suppress bending and deformation ■ Austempering: Processing with less deformation and distortion compared to conventional quenching and tempering ■ Austempering: Greater toughness and higher impact resistance *For more details, please refer to the PDF document or feel free to contact us.

• Processing Contract

Our company offers "soft nitriding treatment (Tufftriding)." This process is conducted at a lower temperature (generally between 550 and 580°C) than the transformation point temperature (the austenite transformation temperature during quenching), resulting in extremely minimal deformation compared to carburizing or conventional quenching. Unlike the phenomenon of hardening through quenching, this treatment hardens by diffusing nitrogen into the surface and forming a layer of iron nitride compounds on the surface. (This differs from the form of hardening that utilizes the transformation of steel as in quenching.) Soft nitriding aims to improve fatigue strength, wear resistance, and corrosion resistance. The finish appears gray to light gray (the color of the nitrided layer). The treatment methods include salt bath nitriding, gas nitriding, and plasma nitriding. 【Features】 ■ Soft nitriding treatment can be applied to most materials (various steel types including carbon steel, cold-rolled steel, structural steel, stainless steel, cast iron, etc.) ■ Due to salt bath nitriding, it is easy to apply to small quantities of diverse products. ■ We can also handle polishing treatment after Tufftriding in-house. ■ We can accommodate small precision parts and diverse small-batch processing with short lead times. *For more details, please refer to the external link or feel free to contact us.

• Other surface treatment equipment

Austenitizing is a type of quenching and tempering that results in less deformation and distortion compared to conventional quenching and tempering processes. Not only does it minimize deformation, but it also enhances toughness and impact resistance, resulting in significantly different strength levels even at the same hardness compared to traditional quenching and tempering. 【Features】 ■ Minimal deformation and dimensional changes ■ Impact values are 2 to 3 times higher compared to materials of the same hardness *For more details, please refer to the external link or feel free to contact us.

• Processing Contract

Our company receives many orders for "carburizing and quenching" of small precision parts. Compared to gas carburizing, it has better carburizing efficiency and can be performed at lower temperatures, resulting in less thermal deformation. Additionally, during carburizing heating, the buoyancy of the salt reduces deformation caused by the weight of the parts. Please feel free to contact us if you have any requests. 【Features】 - Heating in salt (liquid) minimizes the influence of radiant heat from the furnace heaters, allowing for uniform heating. - Carburizing in higher temperature salt, which allows for sufficient quenching, controls thermal shock deformation and stress associated with phase transformation to the minimum necessary. - Uniform formation of extremely thin carburized hardened layers of less than 0.1 mm on small parts, etc. *For more details, please refer to the external link or feel free to contact us.

• Incinerators and incinerators
• Processing Contract
• Other abrasives