Maruichi Steel Tube

What Maruichi Steel Tube does

Maruichi Steel Tube is a Japanese B2B manufacturer specializing in carbon steel and stainless steel pipes and tubes, holding Japan's No.1 domestic production share in electric resistance welded (ERW) carbon steel pipes and Japan's No.2 share in stainless seamless tubes (globally No.1 in semiconductor-grade precision tubes). Founded in 1948 and headquartered in Osaka, the group operates an integrated manufacturing model spanning raw material processing (pickling, cold rolling, continuous hot-dip galvanizing including the AL-Z55 alloy plating line) through finished steel pipe production, a vertical structure described in the company's own materials as unique among Japanese pipe specialists. Group operations extend across 13 domestic production bases, 27 sales offices, and 11 overseas subsidiaries in the United States, Mexico, Vietnam, India, and the Philippines, with consolidated revenue of ¥243.7 billion in FY March 2026.

The product portfolio is organized around six core categories: ordinary carbon steel ERW pipes for structural, piping, agricultural, and line-pipe applications; surface-treated pipes including the AL-Z55 55% aluminum-zinc alloy-coated line produced under exclusive license from BIEC International Inc. (a chromate-free AL-Z55N variant was added for severe-environment applications); seamless stainless steel tubes (precision thin tubes, special tubes, titanium welded tubes) from subsidiary Maruichi Stainless Steel Tube; galvanized and AL-Z55 steel strips and coils; Maruichi Poles (lighting columns, sign poles, signal poles, ETC gantries) produced at Sakai Special Products Plant and Kashima Special Products Plant; and automotive components from Alpha Metal. Production capacity exceeds 127,000 tons per month domestically, with the Sakai Plant operating stretch-reducer mills for hot-formed pipe and spin-formed tapered poles.

Revenue is generated through direct B2B sales via a route sales model connecting 27 domestic sales offices with regional customers and production plants, supplemented by wholly-owned sales subsidiary Maruichi Kanpan and trading-company intermediation for certain end-users. End-markets span construction and infrastructure (foundations, structural frames, scaffolding), automotive (structural components, exhaust systems), semiconductor manufacturing (high-purity gas piping for fabrication equipment), hydrogen and new energy infrastructure, power generation, agriculture, electrical construction, and government infrastructure projects including Expo 2025 Osaka-Kansai. Group consolidated revenue reached ¥243.7 billion for FY March 2026, targeting ¥300 billion under the 7th mid-term plan and ¥400 billion under the MARUICHI 2030 VISION.

Name

Maruichi Steel Tube

Legal name

丸一鋼管株式会社

Website

https://maruichikokan.co.jp

Company type

Public

Founded year

1948

Operating status

Operating

Headcount range

1,001–5,000 employees

Short description

Maruichi Steel Tube is a Japanese B2B steel pipe manufacturer holding Japan's No.1 share in ERW carbon steel pipes. It serves construction, automotive, semiconductor, energy, and infrastructure customers via 13 domestic plants and 11 overseas subsidiaries across 5 countries.

Ownership category

akta.pro rank

Product category

Steel Pipe Manufacturing

NAICS

Iron and Steel Pipe and Tube Manufacturing from Purchased Steel (33121), Iron and Steel Pipe and Tube Manufacturing from Purchased Steel (331210), Steel Product Manufacturing from Purchased Steel (3312)

SIC

Steel Pipe & Tubes (3317), Steel Works, Blast Furnaces & Rolling & Finishing Mills (3310)

akta.pro primary industry

Pipe & Tube Manufacturing (Seamless & Welded OCTG/Line Pipe/Structural Tube) (IMAKABAI)

akta.pro secondary industries

Pipes & Tubing (Metal, Plastic & Composite) (IMADALAC), Steel Plate, Sections & Welded Assemblies (IMADACAD)

Keywords

• Steel pipe manufacturing
• ERW welded steel tubes
• Stainless steel pipes
• Galvanized steel products
• Structural steel products

Headquarters

HQ city

Osaka

HQ country

Japan

HQ region

Asia

Offices19 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Ordinary Carbon Steel Welded Pipes: Core product line including structural steel pipes, piping steel pipes, agricultural steel pipes, and line pipes. Manufactured via ERW process at domestic plants. Primary revenue driver representing the bulk of domestic core business sales.
2. Stainless Steel Pipes and Tubes: Seamless stainless steel tubes, precision thin tubes, special tubes, and titanium welded tubes produced by Maruichi Stainless Steel Tube Co. Growing segment targeting semiconductor manufacturing equipment, hydrogen stations, and power generation applications.
3. Surface-treated Steel Sheets and Coils: Galvanized steel strips, AL-Z55 steel strips, and pre-plated steel materials for industrial applications. Manufactured at Takuma Plant with monthly capacity exceeding 30,000 tons.
4. Special Products (Maruichi Poles): Custom-designed lighting poles, sign poles, signal poles, ETC gantry structures, and multi-purpose poles for infrastructure. Produced at Sakai Special Products Plant and Kashima Special Products Plant.
5. Automotive Parts: Automotive components manufactured by subsidiary Alpha Metal (Kyushu), supplying steel parts to automotive manufacturers.

Pricing tiers

Go-to-market motion1 record

Distribution channels4 records

Marketing channels8 records

Core offering

Maruichi Steel Tube manufactures and sells steel pipe products for industrial and infrastructure applications: ordinary carbon steel welded (ERW) pipes, stainless steel seamless pipes, surface-treated pipes (AL-Z55 aluminum-zinc alloy plated, Prezinc continuously galvanized, hot-dip galvanized), structural steel pipes, surface-treated steel sheets/coils, electrical conduit pipes, and customized steel poles (lighting, sign, signal, ETC gantry). Operations span integrated in-house raw material processing (pickling, cold rolling, plating) at Tokuma Plant through to ERW pipe manufacturing at multiple domestic plants and overseas subsidiaries.

Product overview

丸一鋼管は普通鋼電縫鋼管・ステンレス鋼管を主力とする鋼管メーカー。製品ポートフォリオは（1）普通鋼鋼管（ERW方式）—構造用・配管用・農芸用・ラインパイプ等、（2）表面処理鋼管—AL-Z55合金めっき鋼管、プレジンク、どぶ染めめっき鋼管、（3）ステンレス鋼管—シームレス管・精密細管・特殊管・チタン接合管、（4）マルイチポール—照明柱・標識柱・設備柱・信号柱等の鋼管ポール製品、（5）表面処理鋼板（めっき鋼帯）、（6）電材製品—鋼製電線管・附属品、の6領域で構成される。詫間工場の材料加工処理一貫ラインと堺工場のSR設備など、自社の製造設備による一貫生産体制が競争力の核。

Differentiator

Problem solved

Functional benefit

Brands

• Maruichi Stainless Tube Co., Ltd. (丸一ステンレス鋼管株式会社): Seamless stainless steel pipes, precision thin pipes, special pipes, titanium welded pipes manufacturing and sales
• TOYO TOKUSYU KOGYO (東洋特殊鋼業)
• Maruichi AL-Z55
• Maruichi Prezinc (プレジンク)
• Maruichi Pole (マルイチポール)

Products and services

• Ordinary Carbon Steel Welded Pipes (普通鋼鋼管 / 普通鋼電縫鋼管) Carbon steel welded steel pipes (ERW manufacturing method) including structural steel pipes, piping steel pipes, agricultural steel pipes, and line pipes for construction, infrastructure, agriculture, and industrial applications.
• Maruichi AL-Z55 (55% Aluminum-Zinc Alloy Plated Steel Pipes) Steel pipes with 55% Al-Zn alloy plating that combines the barrier corrosion protection of aluminum with the sacrificial protection of zinc, providing 2-6x the corrosion resistance of standard hot-dip galvanizing. Chromate-free AL-Z55N variant also available.
• Maruichi Prezinc (Continuous Galvanized Steel Pipes / プレジンク) Internally and externally galvanized steel pipes with excellent corrosion resistance, processed workability, and appearance quality, manufactured through continuous plating lines under in-house integrated quality control.
• Hot-Dip Galvanized Steel Pipes (どぶ染め亜鉛めっき鋼管) Steel pipes surface-treated by dipping into a hot-dip galvanizing bath after pipe manufacturing, optimized for applications requiring high corrosion resistance.
• Stainless Steel Pipes and Tubes (ステンレス鋼管) Seamless stainless steel tubes, precision thin tubes, special tubes, titanium welded tubes, and titanium joint tubes manufactured by group company Maruichi Stainless Steel Tube Co., Ltd. Target applications include semiconductor manufacturing equipment, hydrogen stations, and power generation.
• Maruichi Poles (マルイチポール) - Lighting, Sign, Signal, ETC Gantry, and Equipment Poles Steel pipe pole products including road lighting columns, sign poles, signal poles, information board poles, ETC gantry structures, and equipment mounting poles for road infrastructure and public spaces.
• Square Shape Colored Steel Pipes (角形カラー鋼管) JIS G 3466 certified steel pipes coated with zinc and chromate-free anti-rust paint compliant with JIS K 5674 standards, for environmentally considerate construction applications.
• Surface-Treated Steel Sheets and Coils (Galvanized Steel Strips / めっき鋼帯) Galvanized steel strips, AL-Z55 alloy-coated steel strips, and pre-plated steel materials manufactured through integrated pickling, cold rolling, and continuous plating lines, supplied for industrial applications.
• Electrical Products (Steel Conduit Pipes and Accessories / 電材製品) Steel conduit pipes, synthetic resin-coated steel pipes for cable protection, and other electrical construction steel pipe products, including chromate-free variants, for cable protection in factories, warehouses, and commercial buildings.
• Automotive Parts (via Alpha Metal subsidiary) Automotive components manufactured and sold by subsidiary Alpha Metal Co., Ltd. (Kyushu), supplying steel parts to automotive manufacturers.

Quantifiable outcome

• AL-Z55 coating provides 2-6x corrosion resistance compared to standard hot-dip zinc plating
• +2 more outcomes

Named customers10 records

Segments7 records

Ideal customer profiles6 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Five partnerships are on record, tiered minor, major and core.

• Wu Chia-Yen (ウー・チャイェン, 吳佳晏)minorGTM or Marketing Partner · 1 January 2026プロゴルファーのウー・チャイェン選手とのスポンサー契約を2026年1月より締結。競技用ウェア右袖に「丸一鋼管」ロゴマークを揭出。台湾との鋼材調達や共同事業での歴史的結びつきを背景に、台湾との多面的な紐帯深化を目的としたマーケティングパートナーシップ。
• 太陽工業株式会社 (Taiyo Kogyo Co., Ltd.)majorStrategic or Co-development Partner · 1 January 2023大阪ヘルスケアパビリオン「鳥の巣」デザインの網目状透明屋根プロジェクトで太陽工業に構造用鋼管（合計3,107本・総重量90トン）を納入。屋根のトラス材に使用され、光を取り込み省エネにも貢献する空間の実現に寄与した。
• 2025年日本国際博覧協会 (Expo 2025 Osaka-Kansai Association)majorStrategic or Co-development Partner · 1 January 2022丸一鋼管はブロンズパートナーとして2025年大阪・関西万博に協賛。鋼管杭（総重量2,522トン、534本、約50m）を作業場に納入し会場基礎を支えた他、大阪ヘルスケアパビリオン屋根に構造用鋼管3,107本（90トン）、会場内照明柱289本・設備柱161本のマルイチポール（合計450本）を納入。万博テーマ「いのち輝く未来社会のデザイン」に沿った製品提供を行った。
• BIEC International Inc.coreTechnology or Integration · 1 January 2002BIECとのライセンス契約により、鋼管専業メーカーとして世界初となる55%Al-43.4%Zn-1.6%Si合金めっき「AL-Z55」の製造技術を導入。AL-Z55鋼帯を用いた鋼管製造により業界最高水準の耐食性を実現。2002年に生产を開始し、現在も継続的にAL-Z55製品を提供している。
• 有限責任あずさ監査法人 (KPMG AZSA LLC)coreOthers会計監査人として有限責任あずさ監査法人を採用。同法人の指定有限責任社員業務執行社員および複数の監査業務補助者により監査が実施されている。股东・投資家に対する責務を負う会計監査人として、経理部や内部監査室等の関係部署や監査役会と連携し適正な監査を確保している。

Scale indicators9 records

Recent moves9 records

Expansion highlights6 records

Broad incumbents

• Tata Steel: India-headquartered global integrated steelmaker with operations in Europe and Southeast Asia including steel pipe products. Comparable to Maruichi in Indian market presence (Maruichi operates KUMA in India) and broader automotive/construction steel supply.
• Kobe Steel (Kobelco): Japanese specialty steel and aluminum producer with welding and construction materials operations. Comparable to Maruichi in specialty steel products and serves overlapping industrial machinery and infrastructure customers.
• JFE Steel Corporation: Second-largest Japanese integrated steelmaker with broad product portfolio including steel pipe and tube products. Overlaps with Maruichi in automotive, construction, and infrastructure end-markets as a major Japanese competitor.
• Hyundai Steel: Korean integrated steelmaker producing flat and long products including steel pipe. Comparable to Maruichi as a regional Asian competitor serving automotive, construction, and industrial markets, and a peer in cross-border steel competition.
• Nippon Steel Corporation: Japan's largest integrated steelmaker producing plates, sheets, bars, and a broad pipe/tube portfolio. While far larger and more diversified than Maruichi, it competes in Japanese steel pipe markets and serves overlapping automotive, construction, and energy customers.

Direct peers

• Atkore Inc. US manufacturer of electrical raceway products including steel conduit, as well as mechanical and structural tubing. Comparable to Maruichi's electrical conduit (鋼製電線管) and structural pipe product lines serving construction and electrical infrastructure end-markets.
• Vallourec: French-headquartered global leader in premium seamless OCTG and line pipe solutions. Comparable to Maruichi in welded/seamless tube manufacturing, industrial pipe applications, and exposure to energy and infrastructure markets.
• Wheatland Tube (Zekelman Industries): Leading North American manufacturer of steel pipe and tube products including standard pipe, electrical conduit, and mechanical tubing. Directly comparable to Maruichi in welded carbon steel pipe and electrical conduit product lines, particularly for construction and electrical infrastructure customers.
• Tenaris: Global leader in seamless and welded steel pipe manufacturing for energy, industrial, and mechanical applications. Directly comparable to Maruichi in core welded pipe technology and end-market exposure to construction, energy, and industrial customers.
• Valmont Industries: US-based global manufacturer of infrastructure products including lighting and traffic poles, utility structures, and steel fabricated components. Closely comparable to Maruichi's Maruichi Pole business for road infrastructure, lighting, and sign poles.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks6 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/channel/UCiuDNoLCnNPhnPGnCf325qQ

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles14 records

Subsidiaries17 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 Maruichi Steel Tube