クマガイ特殊鋼 Product Lineup

The underground protective steel plate "KN-BLOCK" is a protective board designed to safeguard buried utilities from pavement cutter blades in various infrastructure projects, including electrical duct construction, telephone lines, and water pipes. It uses ultra-soft steel as its material, achieving a unique structure that absorbs blade impacts with excellent toughness. Despite a thickness of 12mm, it provides protective performance equivalent to that of a typical 16mm thick SS400 protective board. The reduction in thickness results in a lightweight design, improving transportation and construction efficiency, while also contributing to reduced work burden and environmental impact. This product is registered with NETIS and is recognized as a new technology eligible for evaluation in public works. Kumagai Special Steel has established a consistent production system at its own factory as the manufacturer of KN-BLOCK. It ensures thorough quality control and stable supply. As of July 2025, it has a delivery record to 123 projects across 28 prefectures nationwide and supports nationwide shipping. It safely and reliably supports the electrification of utility poles and the development of road infrastructure.

• Special Steel

1. What is Titanium (Ti) - A high-performance metal material that combines lightweight, high strength, and high corrosion resistance. - A highly reliable material as specified in JIS H 4600. - Excellent resistance to seawater and chemicals, suitable for harsh environments. - Extensive track record in chemical, marine, medical, and industrial fields. 2. Excellent Material Properties - Exhibits high specific strength, being lighter than iron with a specific gravity of about 4.5. - High corrosion resistance even in seawater, chlorine, and acidic environments. - Excellent biocompatibility and high safety. 3. Wide Range of Applications and Steel Types - Chemical equipment, corrosion-resistant piping, heat exchangers. - Marine and coastal facilities, architectural and decorative materials. - Pure titanium and titanium alloys can be selected based on application. 4. Kumagai Special Steel's Capability - Stable supply of standard and cut titanium materials. - Wide range of support including plates and round bars. - Comprehensive support from cutting and processing to welding. - Flexible response for small lot sizes. 5. Value Proposal to Customers - Proposing optimal materials according to the usage environment. - One-stop support for materials and processing. - A trusted partner supporting the procurement of high-performance materials. For quotes, click here: https://www.kumagai-steel.co.jp/contact/offer/

• Non-ferrous metals

1. What is SUS304 - The most widely used austenitic stainless steel - A highly reliable material specified in JIS G 4304/JIS G 4305 - Excellent balance of corrosion resistance and workability - Rich track record as a core material in equipment and machinery fields 2. Excellent material properties - High corrosion resistance due to chromium and nickel additions - Stable performance in atmospheric and water environments - Excellent weldability and formability, suitable for a wide range of processing 3. Wide range of applications and steel types - Food and kitchen equipment, chemical equipment, piping and tanks - Construction materials, industrial machinery, various equipment parts - Can be selected according to specific applications as general-purpose stainless steel 4. Kumagai Special Steel's responsiveness - Stable supply of standard and cut materials of SUS304 - Supply of various types including plates, steel pipes, shaped steel, and round bars - Comprehensive support from cutting, bending, to welding processing - Flexible response to small lot and short delivery time projects 5. Value proposition to customers - Proposing optimal materials according to the usage environment - One-stop support for materials and processing - A trusted partner supporting equipment procurement For quotes, click here↓↓↓ https://www.kumagai-steel.co.jp/contact/offer/

• stainless

1. What is alloy steel for mechanical structures? - Steel materials for mechanical parts requiring high strength and high toughness - Strict management of composition and mechanical properties based on JIS standards - High performance achievable through design based on heat treatment - Extensive track record in industrial machinery, automobiles, and construction machinery fields 2. Excellent material properties - High strength and toughness due to chromium and molybdenum additions - Fatigue resistance and wear resistance ensured through quenching and tempering - Exhibits stable mechanical properties compared to carbon steel 3. Wide range of applications and steel types - High-strength shafts, gears, drive shafts, pins, etc. - Industrial machinery, automotive parts, construction machinery - Selectable by application, such as SCM435/SCM440 4. Kumagai Special Steel's responsiveness - Handling standard and cut materials of alloy steel for mechanical structures - Consistent support from cutting to processing and heat treatment arrangements - Flexible response to small lot and short delivery time projects 5. Value proposition to customers - Proposing optimal steel types according to usage conditions - One-stop support for materials and processing - A trusted partner supporting manufacturing For quotes, click here↓↓↓ https://www.kumagai-steel.co.jp/contact/offer/

• Special Steel

We would like to introduce the "mild steel" handled by Kumagai Special Steel Co., Ltd. Unlike special steels such as high-strength steel, it is low carbon steel, which means it has low hardness, is easy to process and weld, and is inexpensive and easy to supply in large quantities. Its wear resistance and corrosion resistance are inferior compared to special steels, so combining it with special steels expands its possibilities. 【Product Overview】 ■ Product Name: SS400, SPHC, SPHC-P ■ Standard Sizes - Plate Thickness: 1.6 to 150 - Dimensions: 1219×2438, 1524×3048, 1524×6096, 2000×6096 *For more details, please refer to the PDF document or feel free to contact us.

• Steel

We would like to introduce the "Hot Pressed Steel Materials" that we handle. These components can be freely designed, combining both aesthetics and structure. While demonstrating originality, they significantly reduce cutting and welding processes, leading to improved yield and reduced processing time. We can accommodate various materials such as ordinary steel, carbon steel, high-strength steel, and stainless steel. Please feel free to consult us when you need assistance. 【Features】 ■ Free design is possible ■ Significant reduction in cutting and welding processes ■ Improved yield and reduced processing time are expected *For more details, please refer to the PDF document or feel free to contact us.

• Special Steel

"SC・SCM" is a carbon steel plate for mechanical structures that improves durability and machining accuracy through enhanced hardness characteristics due to heat treatment, and also contributes to thin plate applications. It can be used for general industrial machinery, industrial vehicle parts, and screen materials. This steel is suitable for machine parts such as shafts and pins that require durability and precision. Please feel free to consult us when you need assistance. 【Features】 ■ A wide variety of types and sizes ■ Clear component specifications according to JIS standards ■ Ideal for applications requiring machining accuracy, strength, and thin plates *For more details, please refer to the PDF materials or feel free to contact us.

• Special Steel

"SB" is a pressure vessel and boiler steel plate that prevents graphitization at high temperatures and maintains strength. It is a carbon steel suitable for components used at temperatures above room temperature. It is used in applications such as thick plates for boilers and pressure vessels. Our company offers one-stop services for machining, bending, and welding. We provide cutting and processing proposals tailored to your intended use and material. 【Lineup】 ■SB410 ■SB450 ■SB480 ■SB450M ■SB480M *For more details, please refer to the PDF document or feel free to contact us.

• Special Steel

"CORSPACE" is a steel that extends the painting cycle and is effective for bridges, cranes, and building materials in coastal areas with high salt damage. It contains a small amount of tin (Sn), which significantly suppresses the corrosion of the steel compared to ordinary steel. By extending the painting cycle, it reduces maintenance costs and environmental impact. It addresses issues such as rust from paint pinholes and deterioration, as well as rust from sharp edges of components, which are common problems with ordinary steel. 【Features】 ■ Effective in coastal areas with severe salt damage ■ Solves issues associated with ordinary steel ■ Complies with all JIS standards required for bridges ■ Listed as "tin-added steel" in the "Materials Used" section of the "Bridge Structure Design and Construction Guidelines" published by Metropolitan Expressway Company Limited in June 2015 *For more details, please refer to the PDF document or feel free to contact us.

• Special Steel

"NM-13MN" is a non-magnetic, impact-resistant wear-resistant steel plate known as Hyman steel or high manganese steel, which hardens upon impact. It is more wear-resistant than stainless steel and can be procured at a lower cost. It is used for shot machine linings, safes, and crushers, among other applications, and due to its non-magnetic properties, it is also used in components for linear motor cars and electronic equipment. 【Features】 ■ Steel material with work hardening and non-magnetic properties ■ Capable of handling difficult processing ■ Usable for a wide range of applications *For more details, please refer to the PDF document or feel free to contact us.

• Special Steel

"COR-TEN" is a weather-resistant steel plate that protects the base material with its surface rust and suppresses the progression of rust. With excellent weather resistance, paintability, and weldability, it features a subdued color tone of rust that enhances its aesthetic effect. This steel material has the characteristic of preventing rust with rust itself. We offer a wide variety of shape steel, including channel steel, H-beams, flat steel, and angle steel. Please feel free to consult us when you need assistance. 【Features】 ■ Reduces the weight of steel material due to high strength at room and high temperatures ■ Can be used unpainted due to excellent weather resistance ■ Reduces repainting costs, lowering lifecycle costs and environmental impact ■ Enhances aesthetic effect with the subdued color tone of protective rust ■ Easily weldable by any method, including manual welding *For more details, please refer to the PDF document or feel free to contact us.

• Special Steel

"S-TEN" is a steel plate that exhibits excellent performance in sulfuric acid and hydrochloric acid dew point corrosion in flue gas equipment such as coal-fired boilers and waste incineration facilities. We offer two specifications suitable for different environments: "S-TEN1" for use in ambient conditions (below 300°C) and "S-TEN2" for use in high-temperature environments (approximately 300°C to 500°C). It is also effective against sulfuric acid and hydrochloric acid corrosion in hydrochloric acid pickling tanks and industrial sulfuric acid tanks, with strength, workability, and weldability comparable to ordinary steel and more economical than stainless steel. 【Features of S-TEN1 and S-TEN2】 ■ More economical compared to stainless steel ■ A wide range of products including hot-rolled steel plates, cold-rolled steel plates, steel pipes, and welding materials ■ Strength, workability, and weldability are equivalent to ordinary steel *For more details, please refer to the PDF document or feel free to contact us.

• Special Steel

"ABREX" is a wear-resistant steel plate effective for components subjected to severe abrasion, such as construction machinery and factory equipment. It has 2 to 5 times the wear resistance compared to mild steel, ensuring a long lifespan. It is a special steel that allows for weight reduction and has excellent weldability. With excellent machinability and a wide variety of specifications and sizes, it can be utilized for various applications. Please feel free to consult us when you need assistance. 【Features】 ■ Excellent wear resistance ■ High weldability ■ Abundant specifications and sizes ■ Good machinability *For more details, please refer to the PDF document or feel free to contact us.

• Special Steel

"WEL-TEN" is a high-tensile steel plate that excels in corrosion resistance and is less prone to rust even in environments exposed to rain and wind, extending the product's lifecycle in an economical and eco-friendly manner. It can be used in a wide range of applications including pressure vessels, heavy oil and crude oil tanks, penstocks, bridges, steel frames, construction machinery, and industrial machinery. It can be cut under conditions similar to those of ordinary steel, and welding can also be performed using the customer's existing equipment. [Features] ■ Lightweight ■ Long lifespan ■ Cost reduction *For more details, please refer to the PDF materials or feel free to contact us.

• Special Steel
• Steel

"WEL-TEN(R)" is a steel material that is stronger in tension and has high strength compared to ordinary steel SS400. It also excels in corrosion resistance, making it less prone to rust even in environments exposed to rain and wind, thereby extending the product's lifecycle and being economical. It is used in a wide range of applications including pressure vessels, heavy oil and crude oil tanks, penstocks, bridges, steel frames, construction machinery, and industrial machinery. [Features] ■ Can be cut, welded, and bent just like ordinary steel ■ Strong in tension and hard ■ Achieves over 20% weight reduction *For more details, please download the PDF or feel free to contact us.

• Steel