遠州熱研 List of Products and Services

At Enshu Thermal Research Co., Ltd., we conduct metal heat treatment and metal surface treatment for a wide variety of products, including transportation equipment, industrial machinery, machine tools, and automotive parts. We offer heat treatment methods and surface treatment methods tailored to materials such as ordinary steel like SS, SPC, and SM, as well as special steels (low carbon steels) like S15C and S20C, including blackening and Parkerizing treatments. We receive requests from a wide range of fields, including major prototype departments, universities, and companies outside the prefecture. We can accommodate various needs, even for a single part. 【Features】 ■ Support for a wide variety of products ■ Capability for single items and small lot production ■ Quick delivery response, flexible to desired delivery dates ■ Unique skilled techniques such as "stress relief" and "blackening" treatments *For more details, please refer to the related links or feel free to contact us.

• Steel
• Special Steel
• Other contract services

"Shrink fitting" is a process that utilizes thermal expansion to fit a shaft and bearing together. The bearing is heated to expand, and the shaft is inserted. As the bearing cools down afterward, the shaft and bearing become fixed in place. Please feel free to contact us when you need assistance. 【Features】 ■ A process that uses thermal expansion to fit the shaft and bearing together ■ The shaft and bearing become fixed in place as the bearing cools down ■ JIS processing symbol: AFTS *For more details, please refer to the PDF document or feel free to contact us.

• Processing Contract

"Precipitation hardening" refers to a treatment process in which precipitation hardening stainless steel is heated and held at a specified temperature, followed by air cooling to achieve hardening. The formation of a different phase with a distinct structure or organization within a solid is called precipitation, and the process of artificially precipitating another phase to achieve hardening is known as precipitation hardening, also referred to as aging hardening. The precipitation hardening treatment conditions for SUS630 are specified by the following four conditions, and it can accommodate H900, H1025, H1075, and H1150. [Features] ■ Treatment process for precipitation hardening stainless steel, heated and held at a specified temperature, followed by air cooling to achieve hardening ■ Treatment conditions for SUS630 - Specified by four conditions - Can accommodate H900, H1025, H1075, and H1150 ■ JIS processing symbol: HAG *For more details, please refer to the PDF document or feel free to contact us.

• Processing Contract

"Flame hardening" is a process that involves heating the surface of steel with a high-temperature flame, followed by quenching to harden the surface layer. Using a torch, the steel is heated partially and then rapidly cooled. This process allows for a hard surface layer with high wear resistance and a tough core, resulting in significant residual compressive stress on the surface, which improves fatigue strength. It is suitable for partial hardening of small items (approximately Φ30 or smaller). 【Features】 ■ A process that heats the surface of steel with a high-temperature flame and then hardens the surface layer. ■ Capable of producing a hard surface layer with high wear resistance and a tough core. ■ The generation of significant residual compressive stress on the surface improves fatigue strength. ■ Suitable for partial hardening of small items (approximately Φ30 or smaller). ■ JIS processing symbol: HQF *For more details, please refer to the PDF document or feel free to contact us.

• Other surface treatment equipment

"Gas nitriding" is a treatment that hardens only the surface layer of steel by allowing nitrogen and carbon to permeate and diffuse from the surface at a specified temperature. Ammonia (NH3), nitrogen (N2), and carbon dioxide (CO2) are supplied in a furnace at temperatures below 500°C to 600°C, where the decomposed active nitrogen and carbon permeate and diffuse from the surface. A compound layer formed by carbonitrides appears on the surface, and a diffusion layer is generated just beneath it, improving wear resistance and fatigue resistance. [Features] - Low treatment temperature minimizes distortion. - Small dimensional changes are also an advantage of gas nitriding. - Applicable to most steel materials. - Equivalent treatment to salt bath nitriding (tuftriding). - JIS processing symbol: HNC-G. *For more details, please refer to the PDF document or feel free to contact us.

• Other surface treatment equipment

"Annealing" refers to the process of heating steel to a specified temperature, holding it there, and then slowly cooling it down. When machining tools and machine parts, it is necessary to improve machinability by removing residual stress (stress caused by machining or heat), softening the material, and homogenizing the structure. By heating and holding at over 800°C, followed by slow cooling, machinability, ductility, and toughness are enhanced. [Features] ■ A treatment that involves heating steel to a specified temperature, holding it there, and then slowly cooling it. ■ Improved machinability, ductility, and toughness. ■ Selection of treatment according to the desired property improvement: - Diffusion annealing - Full annealing - Spheroidizing annealing - Isothermal transformation annealing - Stress relief annealing ■ JIS processing symbol: HA *For more details, please refer to the PDF document or feel free to contact us.

• Processing Contract

"Yaki Narashi" refers to a treatment in which steel is heated and held at a specified temperature or higher, followed by air cooling. Forged, cast, and rolled steel materials exhibit coarse crystallization and uneven structures, resulting in inadequate mechanical properties. By heating and holding the steel above 800°C (the transformation point) and then air cooling, the mechanical properties are improved through grain refinement, structural uniformity, enhanced toughness, and the removal of residual stress (stress generated from processing or heat). 【Features】 ■ Treatment involving heating and holding steel at a specified temperature or higher, followed by air cooling ■ Grain refinement and structural uniformity ■ Improved toughness and removal of residual stress (stress generated from processing or heat) ■ Enhanced mechanical properties ■ JIS processing symbol: HNR *For more details, please refer to the PDF document or feel free to contact us.

• Processing Contract

"Tempering" refers to the process of heat treatment performed at high temperatures after quenching. By tempering at temperatures above 550°C after quenching, a sorbite structure is formed, resulting in high toughness (ductility). We can adjust to your desired hardness, so please feel free to contact us when needed. 【Features】 ■ Tempering is performed at temperatures above 550°C after quenching ■ Sorbite structure is formed ■ High toughness (ductility) is achieved ■ Adjustable to your desired hardness *For more details, please refer to the PDF document or feel free to contact us.

• Processing Contract

"Carburizing hardening" is a treatment that allows carbon to penetrate and diffuse from the surface of a metal, hardening only the surface. The surface becomes hard and wear-resistant, while the interior maintains lower hardness, providing high toughness and improved fatigue resistance. "Carburizing nitriding" is a treatment that allows both carbon and nitrogen to penetrate and diffuse into the surface of steel, hardening only the surface layer. This improves wear resistance. 【Features】 ■ Carburizing hardening - The surface becomes hard and wear-resistant - The interior maintains lower hardness, providing high toughness - Fatigue resistance can also be improved ■ Carburizing nitriding - A treatment that hardens only the surface layer - Wear resistance is improved *For more details, please refer to the PDF document or feel free to contact us.

• Other surface treatment equipment

"Vacuum carburizing hardening" is a carburizing hardening method conducted in a vacuum furnace. Acetylene gas supplied into the furnace undergoes thermal decomposition, and the carbon generated penetrates and diffuses from the surface. In addition to the carburizing effect, there is no grain boundary oxidation or carburizing unevenness in the surface layer, making it possible for the inner surfaces of pores as well. Moreover, since it finishes with a bright luster, quality improvement can be expected compared to conventional carburizing hardening. 【Features】 ■ Carburizing hardening method conducted in a vacuum furnace ■ In addition to the carburizing effect, it allows for the inner surfaces of pores due to the absence of grain boundary oxidation and carburizing unevenness in the surface layer ■ Finishes with a bright luster ■ Quality improvement can be expected compared to conventional carburizing hardening ■ JIS processing symbol: HQV *For more details, please refer to the PDF materials or feel free to contact us.

• Other surface treatment equipment

"Radiant Hardening" is a hardening method that finishes with the surface maintaining a metallic luster. By processing in a non-oxidizing atmosphere, it prevents oxidation and decarburization, allowing for the protection of the radiant quality. This also leads to a reduction in subsequent processes such as shot blasting. Please feel free to contact us when you need our services. 【Features】 ■ A hardening method that finishes with the surface maintaining a metallic luster ■ Prevents oxidation and decarburization ■ Can protect the radiant quality ■ Leads to a reduction in subsequent processes such as shot blasting ■ JIS processing symbol: HQB *For more details, please refer to the PDF document or feel free to contact us.

• Processing Contract

By performing quenching, the hardness of steel increases and its strength improves, but the degree of hardening varies depending on the carbon content in the steel, the alloying elements present, and the size of the material, which affects the maximum hardness and depth of hardening. The structure of quenched steel is brittle and in a state of internal stress, so re-heating is carried out to adjust hardness, relieve internal stress, and improve toughness. Tempering after quenching is essential and is broadly classified into low-temperature tempering (below 200°C) and high-temperature tempering (above 500°C), with high-temperature tempering referred to as "quenching and tempering treatment." By combining tempering temperature and holding time, the desired hardness can be achieved. 【Features】 ■ Quenching: A treatment where steel is heated and held above a specified temperature, then rapidly cooled with water, oil, etc. to harden. ■ Tempering: A treatment where the steel is re-heated to a specified temperature after quenching. ■ The combination of tempering temperature and holding time allows for the achievement of the desired hardness. ■ JIS processing symbols: HQ (quenching), HT (tempering) *For more details, please refer to the PDF document or feel free to contact us.

• Processing Contract

Our company selects reliable partner companies and accepts commissions. We offer services such as high-frequency hardening, vacuum hardening, Parkerizing, salt bath nitriding (Tufftride), and large-scale annealing/shooting products. Please feel free to contact us when you need our services. 【Overview】 ■ High-Frequency Hardening - Applicable to general steel materials - Estimated delivery time = 2 to 3 business days from the date of receipt (Note: Exceptions may apply depending on whether distortion correction is required; please inquire for large items) ■ Vacuum Hardening - Applicable materials: SKD series / SKH series / martensitic SUS / SK / medium carbon steel - Estimated delivery time = 1 to 2 business days from the date of receipt (Note: Exceptions may apply depending on hardness and whether distortion correction is required) * For more details, please refer to the PDF document or feel free to contact us.

• Other surface treatment equipment

"Pickling" refers to the process of removing and cleaning burn marks, rust, scale, etc., caused by heat treatment, welding, brazing, and other methods using hydrochloric acid. The processable size is W600×D1500×H(450–900). It is suitable for steel materials. Please feel free to contact us when you need our services. 【Basic Information】 ■ Processable Size: W600×D1500×H(450–900) ■ Applicable Material: Steel materials ■ Estimated Delivery Time: Same day to the next business day *For more details, please refer to the PDF document or feel free to contact us.

• Processing Contract

"Straightening" is a process that corrects the bending of steel materials caused by heat treatment. Press straightening is performed for carburized and tempered products, while heated straightening is done for hardened products. Depending on the shape, material, hardness, and other conditions, there is a risk of cracking. 【Features】 ■ A process that corrects the bending of steel materials caused by heat treatment 　・ Press straightening for carburized and tempered products 　・ Heated straightening for hardened products ■ JIS processing symbol: ZS *For more details, please refer to the PDF document or feel free to contact us.

• Processing Contract

"Anti-carbon treatment" is a process performed on areas where carburizing hardening is to be avoided. By applying an anti-carbon agent to the threaded sections and machined parts after heat treatment, it prevents the infiltration of carbon during carburizing. The coated areas are hardened with the original carbon content of the base material, so they do not increase in hardness compared to the carburized sections. It is also effective in preventing cracking during hardening. 【Features】 ■ A treatment performed on areas where carburizing hardening is to be avoided ■ Prevents the infiltration of carbon during carburizing ■ Also effective in preventing cracking during hardening *For more details, please refer to the PDF document or feel free to contact us.

• Other surface treatment equipment

"Shot blasting" is a process that removes contaminants and dirt such as scale, rust, and paint from the surface of steel. Using the power of a motor, a rotor called a blade is rotated at high speed, and steel shot is fed into it. The centrifugal force generated by the high-speed rotating blade sprays the shot onto the surface for cleaning. It is suitable for improving appearance, rust prevention, and surface preparation. 【Features】 ■ Process for removing contaminants and dirt ■ Cleans by spraying onto the surface using the centrifugal force of the high-speed rotating blade ■ Suitable for improving appearance, rust prevention, and surface preparation ■ JIS processing symbol: SBSH *For more details, please refer to the PDF document or feel free to contact us.

• Other surface treatment equipment

"Black dyeing" is a treatment that finishes the surface of steel with a black glossy appearance, using a chemical method that involves immersion in an aqueous solution primarily composed of caustic soda. The composition of the film is Fe3O4 (magnetite). Since it originates from a chemical reaction on the surface, the thickness is usually 1 to 2 micrometers (which may vary slightly depending on the treatment time), and it has little impact on the product dimensions, making it suitable for coloring and rust prevention of precision parts. We accommodate a wide variety of products and achieve high quality through years of experience and unique formulation techniques. [Features] - The metal surface turns black as is, resulting in extremely small dimensional changes. - Applicable to most materials such as general iron, steel, and cast iron (excluding aluminum and stainless steel). - Some materials, cast iron, and hardened products may turn slightly reddish-black. - Enhances the added value of products with a beautiful black glossy finish. - Can be accommodated at low cost and with short delivery times (possible same-day delivery at the shortest). *For more details, please refer to the PDF materials or feel free to contact us.

• Other surface treatment equipment

Our company specializes in metal heat treatment and metal surface treatment for a wide variety of products, including transportation equipment, industrial machinery, and automotive parts. We take pride in our ability to correct warping (bending) of long products caused by quenching through a process called "stress relief," as well as our unique formulation technology that gives metal surfaces a glossy black finish through "blackening." Our blackening tanks can accommodate a wide range of products, from large items over 2000mm to very small sizes. Please feel free to contact us with your inquiries. 【Our Strengths】 ■ Support for a wide variety of products ■ Short delivery times (single items and small lots) ■ Unique skilled techniques ■ Business continuity enhancement plan *For more details, please download the PDF or feel free to contact us.

• Processing Contract