What Dai-ichi High Frequency does

Dai-ichi High Frequency Co., Ltd. (DHF) is a privately held Japanese industrial manufacturer founded on July 18, 1950, by a group of seven engineers known as the "Seven Samurai" who pioneered high-frequency induction heating (IH) technology in post-war Japan. The company is organized into six business divisions: Pipe (high-frequency induction bending, polyethylene lining, prefabrication, water transport), Surface Treatment (roll manufacturing, IH hardening/quenching, laser heat treatment, maintenance), Machine (induction heating equipment and systems including the patented DHF Super-Hi superheated steam generator), Rebar (T-head construction method jointly developed with Shimizu Corporation), Bimetal (Bi-met BT&P boiler tube panels and DML bimetal pipes using proprietary IH fusing technology for self-fluxing alloy coatings), and Plant Engineering (piping detailed and production design using 3D/2D CAD systems). DHF holds numerous industry certifications including ClassNK approval (1977), MLIT construction designation (1978), JIS mark certification (1983), and ISO 9001 across multiple sites, and has received the Okochi Memorial Technological Award (1962) and Okochi Memorial Production Award (1971).

DHF serves major Japanese enterprise and government customers across five verticals: steel and metal manufacturers (Nippon Steel, Japan Steel Works), power generation and utilities (Tokyo Electric Power, JXTG Energy), environmental and waste management (Tokyo 23 Ward Cleaning Bureau for waste incineration Bi-met coatings), construction and civil engineering (Shimizu Corporation, Imabari Shipbuilding), and water infrastructure (Water Resources Development Agency Chiba, Shizuoka Prefecture Agriculture Office). The company operates 13 manufacturing plants and 14 sales offices across Japan, plus international subsidiaries and joint ventures in China (Nantong, 2011), USA (DHF America, 2017), Malaysia (SENAR DHF, 2019), Singapore (Keystone Industries, 2021), and Korea (MJ Engineering, 1990). In March 2025, DHF established a joint venture with Germany's Herkules Group (DHF Walldrich Siegen Japan) for machine tool distribution in Asia, and rebranded to DHF in April 2025 to support international positioning ahead of its 75th anniversary. The company employs 484 people as of April 2026 and is led by President and CEO Kotaro Hirayama.

DHF's revenue model combines one-time custom manufacturing orders (engineered pipes, rebar, Bi-met products manufactured to customer specifications), managed services (bending machine rental programs for international projects, technical advisor dispatch), and professional services (joint research, commissioned testing, plant engineering design). Pricing is project-specific and quote-based with no public pricing disclosure. The 2022 Mizue factory expansion increased rebar production capacity by 1.5x, and the company has executed over 10,000m² of Bi-met installations and 28+ bending machine rental projects internationally, demonstrating a project-based, anchor-customer revenue model with long-cycle maintenance replacement revenue from Bi-met boiler tube contracts (extending service life to 10+ years versus 6-month conventional replacement cycles).

Name

Dai-ichi High Frequency

Legal name

第一高周波工業株式会社 (DAI-ICHI HIGH FREQUENCY CO., LTD.)

Website

https://dhf.co.jp

Company type

Private

Founded year

1950

Operating status

Operating

Headcount range

501–1,000 employees

Short description

Dai-ichi High Frequency (DHF) is a Japanese industrial manufacturer specializing in high-frequency induction heating technology across pipe bending, Bi-met coatings, rebar processing, and roll manufacturing. The company serves steel mills, power utilities, construction firms, and water infrastructure clients across Japan and Asia via 13 plants and international subsidiaries.

Ownership category

akta.pro rank

Product category

Industrial Pipe and Metal Processing

NAICS

Power Boiler and Heat Exchanger Manufacturing (33241), Plate Work Manufacturing (332313), Industrial Process Furnace and Oven Manufacturing (333994)

SIC

Fabricated Plate Work (Boiler Shops) (3443), Special Industry Machinery (No Metalworking Machinery) (3550)

akta.pro primary industry

Nuclear Steam Supply System Components & Turbine Islands (IMAHAFAG)

Keywords

• High-frequency induction heating
• Pipe bending manufacturing
• Bimetallic boiler tubes
• Induction heat treatment
• Industrial pipe fabrication

Headquarters

HQ city

Tokyo

HQ country

Japan

HQ region

Asia

Offices14 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Operations, Technology or R&D, Infrastructure, Supply Chain, Marketing or Sales

Revenue model

1. Manufacturing and Sales of Industrial Products: DHF manufactures and sells engineered industrial products including high-frequency bent pipes, polyethylene-lined pipes, rolls, rebar, and Bi-met composite metal products. Products are custom-manufactured to customer specifications with varying order sizes and project-based pricing.
2. Equipment Rental and Technical Services: Rental of bending machines and related equipment for overseas site operations. Technical advisor dispatch services providing supervision, training, and quality assurance for on-site pipe processing operations.
3. Contract Research and Testing Services: Joint research, commissioned testing, demonstration heating tests, and technical consulting services. Equipment maintenance and upgrade services for induction heating equipment.
4. Plant Engineering and Design Services: Piping design services including detailed design, production design, stress analysis, and 3D/2D CAD drafting using systems like PDMS, Spoolgen, and AutoPIPE.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels5 records

Core offering

Dai-ichi High Frequency (DHF) is a Japanese industrial manufacturer that applies proprietary high-frequency induction heating (IH) technology to produce and process engineered steel pipes, rolls, bimetallic boiler components, and T-head rebar. The company operates across six divisions — Pipe, Surface Treatment, Machine, Rebar, Bimetal, and Plant Engineering — serving industrial customers with custom-manufactured products, heat treatment services, equipment, and piping design.

Product overview

DHF (第一高周波工業株式会社) operates as a comprehensive industrial manufacturing company organized into six core business divisions: Pipe, Surface Treatment, Machine, Rebar, Bimetal, and Plant Engineering. The company specializes in high-frequency induction heating technologies as its foundational competency, applied across all product lines. The Pipe Division offers bending, lining, prefabrication, and water transport solutions; the Surface Treatment Division provides roll manufacturing, heat treatment, and laser processing; the Machine Division manufactures induction heating equipment and provides maintenance services; the Rebar Division produces T-head reinforced steel bars; the Bimetal Division creates bimetallic boiler tubes and corrosion-resistant pipes; and the Plant Engineering Division offers comprehensive piping design services. These divisions operate interdependently, with induction heating technology serving as a core enabling technology across multiple product categories, and the company maintains 13 plants and 14 sales offices throughout Japan to serve diverse industrial sectors including power generation, steel manufacturing, construction, and municipal infrastructure.

Differentiator

Problem solved

Functional benefit

Products and services

• High-Frequency Induction Bending (高周波誘導加熱ベンディング) Precision bending of steel pipes, small-diameter pipes, thick-walled pipes, shaped steel, and special materials using high-frequency induction heating for superior dimensional accuracy and mechanical properties. For steel mills, power plants, construction, and industrial piping customers.
• Polyethylene Lining (ポリエチレンライニング) Corrosion protection for steel pipes via inner, outer, and inner-outer polyethylene powder coating, with over 45 years of proven use in buried piping and water transmission applications. For water utilities and infrastructure customers.
• Pipe Prefabrication (プレファブ)

Quantifiable outcome

• Boiler tube service life extended to 10+ years with minimal coating degradation compared to 6-month replacement cycles with conventional tubes
• +3 more outcomes

Named customers11 records

Segments5 records

Ideal customer profiles5 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

Five partnerships are on record, tiered core and minor.

• DHF World Richigee Japan Co., Ltd. (DWS)coreStrategic or Co-development Partner · 3 March 2025Joint venture with Herkules Group Holding GmbH (German machine tool manufacturer) established in March 2025. DWS handles sales, installation, and maintenance of Herkules grinding machines and lathes in Japan and Asia. Provides roll engineering services combining Herkules equipment with DHF's heat treatment and coating capabilities.
• Water Resources Development Agency Chiba Water Use OfficeminorOthersCustomer using DHF Y-joint products for water pipeline construction (φ250 steel pipe to steel pipe connection)
• Shizuoka Prefecture Western Agriculture OfficeminorOthersCustomer using DHF Y-joint products for agricultural water pipeline (φ1000 FRPM pipe to steel pipe)
• Shimizu CorporationcoreStrategic or Co-development PartnerJoint development partner for T-head construction method rebar technology. Collaboration has enabled industry-first expansion of applicable rebar grades to SD590B and epoxy-coated rebar applications.
• Mason Global Materials LLC (USA)minorChannel Partner/ Reseller/ DistributorUS distributor for DHF Bi-met products, contact number +1-724-554-9439

Scale indicators9 records

Recent moves10 records

Expansion highlights5 records

Broad incumbents

• Vallourec: Global leader in premium seamless steel pipe solutions for energy and industrial markets. Larger incumbent with broader portfolio; overlaps with DHF's industrial pipe business but does not specialize in IH processing.
• Tenaris: Major global manufacturer of steel pipes and related services for energy and industrial applications. Larger incumbent with overlapping pipe fabrication capabilities; not specialized in induction heating.

Direct peers

• Benteler International: Global steel and tube processor with major pipe bending and fabrication capabilities. Direct peer in precision pipe bending services for industrial and energy customers.
• TOCALO Co., Ltd. Japanese thermal spray coating and surface treatment specialist. Direct competitor in Bi-met alloy coating and surface treatment services for industrial boiler and pipe applications.
• Kawakin Core-Tech Co., Ltd. Japanese specialist in rebar processing, mechanical joints, and seismic reinforcement products. Direct competitor in T-head and mechanical rebar processing for construction applications.
• Inductotherm Group: World's largest manufacturer of induction melting and heating equipment. Direct competitor to DHF's induction heating equipment and system business across industrial applications.
• EFD Induction (ITW): Major global provider of induction heating solutions for industrial manufacturing. Direct competitor in induction heating equipment and services markets served by DHF.
• Butting GmbH: German custom pipe fabrication specialist serving power, chemical, and offshore markets. Comparable to DHF in engineered pipe products and prefabrication services.
• GH Induction: Spanish manufacturer of induction heating equipment serving global industrial markets. Comparable mid-sized induction heating specialist competing with DHF's equipment division.
• Ajax Tocco Magnethermic (Park Ohio): Provider of induction heating equipment and services. Competes with DHF in industrial induction hardening, heating, and surface treatment systems.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks5 records

Key highlights7 records

Customer concentration

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles9 records

Subsidiaries12 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Dai-ichi High Frequency