共和熱処理 Product Lineup

Kyowa Heat Treatment Co., Ltd. specializes in heat treatment of raw materials, primarily forged and cast products. Heat treatment consists of four methods: "quenching and tempering," "annealing," "normalizing," and "stress relieving." [Features] ■ Increases tensile strength ■ Improves machinability and cutting performance *For more details, please refer to the PDF document or feel free to contact us.

• Processing Contract
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We would like to introduce a case study of metal heat treatment that our company proposed. The inquiry was about preventing heating cracks and burn cracks in high-alloy large forged molds, and the request was for a quenching and tempering process with minimal hardness variation. For large workpieces, we can accommodate quenching and tempering with a maximum processing size of 1100W × 2400L × 600H. Our company performs two-stage heating, lift quenching, and one to three-stage tempering, and we conducted quality confirmation through Brinell hardness measurement (9-point measurement). 【Case Study】 ■ Challenges - Preventing heating cracks and burn cracks in high-alloy large forged molds - Quenching and tempering process with minimal hardness variation ■ Maximum Processing Size - Quenching and tempering: 1100W × 2400L × 600H - Annealing: 2230W × 2450L × 1000H - Normalizing: 2230W × 2450L × 1000H ■ Solutions - Two-stage heating, lift quenching, one to three-stage tempering - Quality confirmation through Brinell hardness measurement (9-point measurement) *For more details, please feel free to contact us.

• Processing Contract
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We would like to introduce a case study of metal heat treatment solutions proposed by our company. The consultation was regarding the desire to reduce quality variation within the same lot and between different lots. Due to the lack of uniform temperature for each product, the microstructure and hardness after heat treatment vary, and the shape (distortion) also changes. Our company ensures consistent manufacturing without variation by implementing equipment and personnel responses, creating heat treatment condition documents and QC process charts, and maintaining an accurate work management system through internal quality patrols and customer process audits. [Case Study] ■ Issues - Quality variation within the same lot and between different lots ■ Responses - Regular measurement and assurance of temperature measurement accuracy and temperature distribution within the furnace - Creation of treatment condition documents and QC process charts - Accurate work management system through internal quality patrols and customer process audits - Participation in various training sessions, including skills qualification education and heat treatment challenger courses *Please feel free to contact us for more details.

• Processing Contract
• Other machine elements

We would like to introduce a case study of metal heat treatment that our company proposed. The consultation request was to remove internal stress at the lowest possible cost. When processes such as cold working or welding are performed, stress can accumulate within the product, leading to deformation over time or aging cracks. Our company estimated the residual stress levels based on the materials, welding methods, and locations, selected appropriate heating and cooling conditions, and carried out stress relief annealing. 【Case Study】 ■Challenge Remove internal stress at a low cost ■Response Selected appropriate heating and cooling conditions and implemented stress relief annealing *For more details, please feel free to contact us.

• Processing Contract
• Other machine elements

We would like to introduce a case study of metal heat treatment that our company proposed. The inquiry was about preventing significant "distortion" in parts with uneven wall thickness, which was causing residual scale during subsequent machining processes. The greater the temperature difference within the product during heating and cooling, the more significant the "distortion" that occurs after heat treatment. Our company ensures that the entire product is uniformly heated and cooled by aligning and setting the products for heat treatment, whether in continuous furnace processing or batch furnace processing. [Case Study] ■ Issue Significant "distortion" in parts, leading to residual scale during subsequent machining processes. ■ Solution Conducting heat treatment by aligning and setting the products to ensure uniform heating and cooling of the entire product. *For more details, please feel free to contact us.

• Processing Contract
• Other machine elements

We would like to introduce a case study of metal heat treatment proposed by our company. The inquiry was about wanting to perform annealing under conditions where there is no ferrite band and no bainite formation for the machining of carburizing parts. For cold forging, we perform spheroidizing annealing to soften the material as much as possible, but for machining, we set heat treatment conditions that achieve a microstructure of ferrite and pearlite with appropriate hardness. Therefore, our company established and implemented heat treatment conditions that satisfy the microstructure and hardness by controlling the cooling rates in the high-temperature range that generates ferrite bands and the medium-temperature range that generates bainite. [Case Study] ■ Issue Annealing under conditions without ferrite bands and without bainite formation ■ Response Setting heat treatment conditions that satisfy the microstructure and hardness *For more details, please feel free to contact us.

• Processing Contract
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Since our establishment, we have been a heat treatment manufacturer specializing in raw materials, utilizing the performance of small mesh continuous furnaces and batch furnaces equipped with HS burners to perform heat treatments such as quenching, tempering, stress relieving, and annealing. We excel in heat treatment of raw materials, primarily forged and cast products, and we also offer proposals for heat treatment methods based on product specifications. Please feel free to consult with us. 【Features】 ■ Quality capability ■ Equipment capability ■ Proposal capability ■ Responsiveness *For more details, please download the PDF or feel free to contact us.

• Processing Contract
• Other machine elements