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At Meinetsu, we have traditionally utilized salt baths to perform heat treatments that enhance the functionality of steel materials. By researching and applying this technology in-house, we have succeeded in creating unique color expressions. This technique utilizes the oxide film formed by heat treatment on stainless steel, and since each piece is done by hand, the resulting products feature distinctive patterns with a mix of various colors. Due to the manual coloring process, there is a high degree of freedom in shape and application, making it suitable for a variety of uses. The nature of the material allows for different colors depending on the thickness of the plate. <Usage Scenarios> Interior wall materials, decorative items, building materials, ceilings, commercial interiors, fasteners, hardware, lighting, residential interiors, indoor decorative materials, wall coverings, art pieces, etc. <Examples of Adoption | Case Images> ◆ As interior wall decoration for a restaurant (cafe) 　→ Vintage-style coloring treatment was applied to create an atmosphere that matches the store's ambiance. ◆ As interior wall decoration for a hotel reception 　→ The finish features a characteristic change in blue hues depending on the angle of light. 　＊Approximately 200 plates of size 400×120 were used. 　＊SUS304: oboro (hazy) *Free samples are available! Please feel free to contact us.

• stainless

At Meinetsu, we have traditionally utilized salt baths to perform heat treatments that enhance the functionality of steel materials. By researching and applying this technology in-house, we have successfully achieved color expressions that have never been seen before. This technique uses the oxide film formed by heat treatment on stainless steel, and since each piece is crafted by hand, it features distinctive patterns that appear to blend various colors, resulting in unique products. 【Case Study Introduction】 ■ Application Location: Decorative items for the hotel reception wall ■ Case Details: We decorated the hotel reception wall using SUS304 stainless steel. The oboro color is achieved with SUS304, resulting in a finish characterized by blue. ■ Number of Pieces and Colors: - Approximately 200 sheets of about 400×120 were used and adhered to one wall. - SUS304 - oboro The color appears differently depending on the angle of light, allowing for various expressions. We utilized two different sheet thicknesses to take advantage of the property that colors vary with thickness. *For technical details, please feel free to contact us. *We also offer free prototypes.

• others

Meinetsu handles various heat treatments, accommodating everything from heat treatment and surface treatment to various coatings according to their applications. Additionally, we pride ourselves on our ability to respond broadly, from a minimum of one piece to mass production in the millions. In this document, we introduce case studies that address common concerns regarding heat treatment, solved using salt bath heat treatment. 【Case studies available in the document】 ■ Want to reduce or eliminate distortion ■ Need quenching hardness ■ Want to extend lifespan 【Treatments available at Meinetsu】 Gas soft nitriding / Salt bath heat treatment (quenching and tempering, carburizing quenching and tempering) / Vacuum heat treatment / Deep drawing press products / Various surface treatments

• Surface treatment contract service

We would like to introduce the coloring technique using salt bath heat treatment. Our company has been utilizing salt baths for heat treatment to enhance the functionality of steel materials. By researching and applying this technology in-house, we have successfully achieved new color expressions. 【Coloring Techniques】 ■Oboro ■Kasumi For more details, please refer to the PDF document or feel free to contact us. Photos by Akari Kuramoto (photos 1-6) and Shuhei Inoue (photo 7).

• Processing Contract

Gas soft nitriding treatment is a heat treatment that forms carbonitrides on the surface by heating and holding in a mixed atmosphere, allowing nitrogen and carbon to diffuse into the surface. It features excellent wear resistance, less distortion compared to quenching, and surface hardness equivalent to that achieved during quenching, with a quicker finishing time. By hardening relatively inexpensive materials, it is also possible to achieve the same hardness as more expensive materials. Additionally, while the basic finishing characteristics such as hardness remain unchanged between "salt bath soft nitriding" and "gas soft nitriding," gas soft nitriding results in a cleaner appearance after treatment, leading to fewer processing steps and faster completion. Products that are treated with salt bath nitriding should also be considered for gas soft nitriding. 【Features】 ■ High wear resistance and corrosion resistance ■ Effective for products with strict dimensional accuracy due to minimized distortion ■ Adopts a retort outer cooling method to reduce the load on the product ■ Minimal nitriding unevenness, resulting in a beautiful (silver-gray) finish ■ Suitable for sliding parts, wear-resistant parts, and resin molds We can accommodate requests for one-off or small-lot heat treatments for prototyping and development. For more details, please refer to the materials available for download in the [PDF download] or feel free to contact us.

• Other surface treatment equipment

At Meinetsu, we are a specialized group in heat treatment, including liquid carburizing quenching, tempering, vacuum heat treatment, gas soft nitriding, various types of annealing, and oxidation-free quenching and tempering (salt bath). We are pleased to announce that we have finally introduced a "Continuous Hydrogen Furnace," enabling us to perform atmosphere heat treatment using hydrogen as the atmosphere gas! 《Currently accepting trial heat treatment applications! Please contact us using the form below!》 【Heat treatment examples using the Continuous Hydrogen Furnace】 ◆ Solution treatment for stainless steel products - Residential equipment parts - Pressed parts such as pneumatic and hydraulic valve components, sensors, etc. - Products concerned about appearance and scratches Please also refer to the "Deep Drawing Pressed Parts" page in the PDF case collection below.

• others

At Meinetsu, we perform "salt bath quenching and tempering" as well as "salt bath carburizing quenching and tempering," and it is possible to carry out a special "coloring treatment" using the salt bath. 【Vintage-style coloring treatment example】 ▶ We applied our unique coloring treatment using the salt bath from the salt bath heat treatment. ◇ The wall of the café in the photo... Utilized colored metal plates as interior wall decorations. ◇ Adopted as collector's items for decorative parts from overseas manufacturers. 《Currently accepting trial requests! Please contact us using the form below!》

• others

The "Case Studies of Heat Treatment" is a collection that includes 14 types of heat treatment methods and target objects, such as gas nitriding treatment and salt bath heat treatment, as well as the relevant industries. [Contents] ■ Gas Nitriding Treatment ■ Salt Bath Heat Treatment ■ Solid Bath Heat Treatment ■ Stress Relief Annealing ■ Range of Possible Heat Treatment Processes ■ Range of Possible Deep Drawing Press Processing *Please view the PDF of the heat treatment case studies available for download.

• Other surface treatment equipment

This is a case study that successfully extended the lifespan by changing the heat treatment method of S45C to "salt quenching." [Content] The heat treatment was changed from oil quenching to salt quenching, resulting in improved wear resistance and durability. The hardness increased from HRC 40-45 to HRC 55-60.

• Other surface treatment equipment

This is a case study that succeeded in extending the lifespan by changing the heat treatment method of S55C to "salt quenching." [Consultation Details] The S55C shaft was being hardened using vacuum oil quenching, but hardness could not be secured. [Solution Case] We proposed changing to salt quenching, which has good heat transfer, and upon performing the quenching, we were able to secure the hardness. Additionally, the salt quenching eliminated uneven hardening and resulted in a fine hardened structure, contributing to the extended lifespan of the product.

• Other surface treatment equipment

This is an introduction to a case where changing the heat treatment of leaf springs to "salt quenching" successfully reduced distortion. 【Consultation Details】 We want to perform quenching on leaf springs that cannot be corrected for distortion, aiming for minimal distortion. 【Solution Case】 We proposed changing the quenching method from oil quenching to the less-distorting "salt quenching." We succeeded in reducing the distortion after quenching.

• Other surface treatment equipment

This is a case study on successfully reducing distortion and shortening delivery times by changing the heat treatment method for long shafts to "salt quenching (salt bath quenching)." 【Consultation Details】 The long shafts that underwent gas carburizing heat treatment exhibited significant distortion, leading to increased heat treatment delivery times, costs, and post-processing efforts, prompting a need for a solution. 【Solution Case】 A proposal was made to switch to heat treatment and cooling using a salt bath. The characteristics of the salt bath allow for uniform quenching with minimal distortion, resulting in a reduction in the number of polishing finishing processes and consequently shortening the delivery time.

• Other surface treatment equipment

This is a case study regarding a request for heat treatment "salt quenching" for SK material prototypes. 【Consultation Details】 We want to achieve a hardness of HRC50 or higher, but if we perform salt quenching with the material as is, issues with precision and distortion arise. 【Solution Case】 We proposed changing the material from SK to SPCC and altering the heat treatment method to gas nitriding. This not only achieved a hardness of HRC50 or higher, but also reduced the total cost of mass-produced items and improved the lifespan of the molds. At Meinetz, we propose heat treatment solutions tailored to our customers' needs.

• Other surface treatment equipment

Gas soft nitriding treatment is a heat treatment process that maintains a temperature range of 550 to 600°C in a mixed atmosphere of carburizing gas and NH3 (ammonia), allowing nitrogen and carbon to diffuse into the surface to form carbonitrides and achieve surface hardening. The Unizoff method generates this mixed atmosphere through the thermal decomposition gas of urea, creating a consistently stable environment. Compared to salt bath heat treatment, it does not use cyanide salts, making it an environmentally friendly heat treatment method that contributes to pollution prevention. Various set methods can be chosen according to the product, such as direct placement on fixtures, hanging, or alignment. Additionally, gas soft nitriding treatment using ammonia gas is also available upon request. 【Features】 - Strong improvement in wear resistance and corrosion resistance - Effective for products with strict dimensional accuracy while minimizing distortion - Adopts retort outer cooling method to reduce load on products - Minimal nitriding unevenness, resulting in a beautiful (silver-gray) finish - Capable of handling sizes up to Φ600mm × 1000mm

• Other surface treatment equipment

"Salt bath heat treatment" is a heat treatment method where a salt bath made primarily from potassium chloride and sodium chloride is heated to high temperatures, and products are immersed in it for quenching and tempering. Compared to conventional gas methods, it offers a uniform finish with minimal distortion, and because the treatment is conducted in an open furnace, it can accommodate a wide range of products from mass-produced items to single pieces. At Meinetsu, the focus is primarily on neutral salt bath quenching and carburizing quenching, but there are plans to expand into quenching of high-speed steel (HSS). It is suitable for carburizing quenching and tempering of automotive parts, as well as salt bath quenching and tempering (submersion quenching) for springs, flat springs, and mold tooling. 【Features】 ■ Uniform finish with minimal distortion ■ Carburizing quenching possible from 0.1mm to 1.0mm ■ Wide range of compatibility from mass-produced items to single pieces ■ Treatment conducted in an open furnace, unlike batch furnaces

• Other surface treatment equipment

Meinetsu's "Vacuum Heat Treatment" features four vacuum furnaces, offering a variety of types to meet customer needs. We have low vacuum to high vacuum types, as well as small to large sizes, enabling us to handle not only small sizes and small quantities but also stress relief and bright annealing for relatively large press products. If you have requests for jig sets, heavy items, or long materials up to 1600mm, please feel free to consult with us. 【Features】 ■ Stress relief annealing ■ Magnetic annealing ■ Bright annealing ■ Solution treatment for stainless steel ■ Aging treatment

• Processing Contract

At Meinetsu, we provide a one-stop solution for products that require press processing and heat treatment, focusing on "deep-drawn pressed products." We have various achievements in residential equipment parts, pneumatic and hydraulic valve components, and pressed parts for sensors. By having heat treatment specialists manage the products, we ensure stable quality, effective delivery management, and reduced meeting times, leading to various benefits that our customers appreciate. 【Features】 ■ Stable quality ■ Quick response and short delivery times ■ No discrepancies in required quality ■ Reduced meeting times ■ Decreased management workload

• Processing Contract

At Meinetsu, we specialize in receiving products made by our customers and performing not only heat treatment but also pre-treatment (barrel cleaning and degreasing), followed by surface treatment (plating and coating) to deliver the finished products. This allows for significant rationalization in delivery times, and we can quickly resolve any issues that arise. ■ Heat Treatment Nitriding treatment / Gas soft nitriding treatment / Salt bath soft nitriding (isonite) / Solution treatment (solid solution heat treatment) / Vacuum annealing / Annealing (softening) / Salt bath quenching / Vacuum quenching / Carburizing quenching / High-frequency quenching / Austempering / Stress relief annealing ■ Other Surface Treatments Shot blasting / Glass bead blasting / Ion plating / DLC coating / TiN coating ■ Polishing and Lapping Barrel polishing (vibration) / Barrel polishing (centrifugal) ■ Plating and Chemical Treatment Baking treatment (hydrogen embrittlement treatment) *after zinc plating / Zinc (barrel and rack) / Unichrome (white) (barrel and rack) / Trivalent chromate (galachrome) / Acid-washed copper (rack) / Nickel (barrel and rack) / Nickel-chrome (rack) / Copper (barrel) / Gold plating and silver plating (barrel and rack) / Tin (barrel and rack) ■ Testing Non-destructive testing

• Processing Contract

Meinetsu develops various heat treatment businesses based on the know-how accumulated over many years in Kariya City, Aichi Prefecture. As a proposal-based company, we strive to improve our technology so that we can assist our customers in solving their challenges and problems from the perspective of heat treatment specialists. We offer heat treatment, surface treatment, and various coatings according to application, and our strength lies in our ability to handle a wide range of production volumes, from one piece to mass production in the millions. [Strengths] ■ Custom-made heat treatment (also supports prototypes and development products) ■ Capable of mass production from one piece to millions ■ Short delivery times ■ ISO 9001 and 14001 certified

• Processing Contract

We introduce Meinetz's products, which handle liquid carburizing, quenching, tempering, vacuum heat treatment, gas nitriding, various coatings, shot blasting, and more. On this page, we showcase our product achievements made through gas nitriding, salt bath heat treatment, solution heat treatment, and stress relief annealing, along with photos categorized by industry, material, delivery time, and type of heat treatment. For heat treatment processing and deep drawing press processing, we also accommodate sizes not listed, so please feel free to contact us. 【Published Achievements】 ■ Gas Nitriding - Product Name: Tap Base - Industry: Electrical Equipment Related - Material: SPCC - Delivery Time: 3-4 days - Heat Treatment: Gas Nitriding - Other: Zinc Plating

• Processing Contract

Even for shafts that are prone to distortion, warping, and deformation, precise heat treatment is possible with Meinetsu's years of expertise and the latest processing method, "gas soft nitriding treatment." The "gas soft nitriding treatment" is a heat treatment that maintains a temperature range of 550 to 600°C in a mixed atmosphere of carburizing gas and NH3 (ammonia), allowing nitrogen and carbon to diffuse into the surface to form carbonitrides, thereby achieving surface hardening. Additionally, because it operates in a temperature range that does not involve changes in metal structure, it results in a treatment that is less prone to deformation and dimensional changes. This method is actively adopted for sliding parts, wear-resistant components, and resin molds. 【Features】 ■ Strongly enhances wear resistance and corrosion resistance ■ Effective in suppressing distortion, suitable for products with strict dimensional accuracy ■ Adopts retort outer cooling method to reduce load on products ■ Minimal nitriding unevenness, resulting in a beautiful (silver-gray) finish ■ Capable of handling sizes up to Φ600mm × 1000mm

• Other surface treatment equipment

The gas soft nitriding treatment for resin molds "slide cores" is a heat treatment for mold components that experience significant wear due to abrasion. There are records showing that the number of shots has increased more than tenfold compared to mold components that have not undergone gas soft nitriding treatment. 【Features of Gas Soft Nitriding Treatment】 ■ Strong improvement in wear resistance and corrosion resistance ■ Effective for products with strict dimensional accuracy by suppressing distortion ■ Adopts retort outer cooling method to reduce the load on products ■ Minimal nitriding unevenness, resulting in a beautiful (silver-gray) finish ■ Effective up to Φ600mm×1000mm

• Other surface treatment equipment

"Gas soft nitriding treatment" is a heat treatment process that maintains a temperature range of 550 to 600°C in a mixed atmosphere of carburizing gas and NH3 (ammonia), allowing nitrogen and carbon to diffuse into the surface to form carbonitrides and achieve surface hardening. By leveraging the characteristics of the Unizof method, it can perform precise heat treatment without inconsistencies, even for one-off and small lot products. It is actively adopted for heat treatment in prototypes, development, and one-off or small lot products, such as sliding parts, wear-resistant components, and resin molds. **Features** - Strong improvement in wear resistance and corrosion resistance - Effective in suppressing distortion, suitable for products with strict dimensional accuracy - Adopts retort peripheral cooling method to reduce the load on products - Minimal nitriding unevenness, resulting in a beautiful (silver-gray) finish - Capable of handling sizes up to Φ600mm × 1000mm

• Other surface treatment equipment