Maruichi Sun Steel Joint Stock Company

What Maruichi Sun Steel Joint Stock Company does

Maruichi Sun Steel Joint Stock Company (trading as SUNSCO) is a Vietnamese steel manufacturer established in 1996 as the country's first 100% foreign-capital (Japanese-owned) steel company, wholly owned by Maruichi Group, Japan. Headquartered in Di An Ward, Ho Chi Minh City, with employment in the 251-500 range, the company operates a single integrated business model built around two core product lines: coated steel coils (Hot-dip 55% Al-Zn SUNCOAT55, hot-dip galvanized CGL, and prepainted SUNCOLOR55) and welded steel pipes and tubes. Production relies on hot-dip coating technology for coils and welding technology for pipes, with the firm being the first and only manufacturer in Vietnam authorized to apply the JIS mark on its products (JISG3302 for coils, JISG3452 for pipes), an exclusivity that anchors its quality positioning.

Revenue is generated through direct enterprise sales and a regional distribution network serving Vietnam and broader Southeast Asia. SUNSCO sells to three primary segments: the construction industry (roofing, walling, structural and infrastructure projects), manufacturing (home appliances, automotive components such as Toyoda Gosei, Denyo, Hanacans, Marubeni), and infrastructure/utilities (HCMC Metro Line 1, Vinhomes, Saigon Centre, AEON Mall Phnom Penh, water-supply and oil-and-gas line-pipe applications). Pricing is project-quoted rather than publicly listed. The customer mix is heavily weighted toward enterprise procurement with documented delivery to LIXIL, Vinhomes, Toyoda Gosei, Marubeni-Itochu, Denyo, Mektec, Nitori, and AEON, indicating a horizontal B2B model split between project-tender and ongoing supply.

The company's recent strategic posture combines capacity reinforcement (Cold Rolling Mill No. 2, 2021) with an ESG-driven cost-and-sustainability program (biomass boiler operational February 2026, ISO 14001:2015 certification through 2027, EPD certifications) and an active certification agenda broadening accessible verticals (API-5L for oil and gas, Lloyd's Register for shipbuilding, SIRIM/SNI/TIS for Southeast Asian national markets). Capital is funded internally by the parent group, with no external equity or debt rounds disclosed.

Name

Maruichi Sun Steel Joint Stock Company

Legal name

Maruichi Sun Steel Joint Stock Company

Website

https://maruichisunsteel.com

Company type

Private

Founded year

1996

Operating status

Operating

Headcount range

251–500 employees

Short description

SUNSCO is a Vietnamese steel manufacturer (est. 1996) producing hot-dip galvanized, 55% Al-Zn coated, and prepainted steel coils plus welded steel pipes, serving construction, manufacturing, and infrastructure customers in Vietnam and Southeast Asia. It is the only Vietnamese producer authorized to apply the JIS quality mark.

Ownership category

akta.pro rank

Product category

Steel Manufacturing

NAICS

Rolling and Drawing of Purchased Steel (33122), Coating, Engraving, Heat Treating, and Allied Activities (3328), Paint and Coating Manufacturing (32551)

SIC

Steel Works, Blast Furnaces & Rolling Mills (Coke Ovens) (3312), Paints, Varnishes, Lacquers, Enamels & Allied Prods (2851), Sheet Metal Work (3444), Primary Smelting & Refining Of Nonferrous Metals (3330)

akta.pro primary industry

Coated & Plated Steel (Galvanized, Galvalume, Tinplate, Electrogalvanized, Color-Coated) (IMAKABAG)

akta.pro secondary industries

Specialty & Alloy Steel (Stainless, Tool Steel, Electrical Steel, High-Strength/HSLA) (IMAKABAJ), Hot Rolling & Primary Mills (Plate, Hot-Rolled Coil/Sheet, Strip) (IMAKABAE), Metal Packaging Coatings & Linings (BPA-NI, Epoxy, Internal Coatings) (IMALADAK), Industrial & Commercial Painting/Coatings/Surface Treatment (IMAIAAAK)

Keywords

• Steel coil manufacturing
• Galvanized steel products
• Steel pipe production
• Metal construction materials
• Coated steel products

Headquarters

HQ city

Hai Duong

HQ country

Vietnam

HQ region

Asia

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Steel Coil Products Sales: Manufactures and sells hot-dip galvanized steel coils, hot-dip 55% Al-Zn coated steel coils, and prepainted variants to construction, manufacturing, and infrastructure companies.
2. Steel Pipe and Tube Products Sales: Produces and sells steel pipes and tubes for construction, water supply, structural, and industrial applications.

Go-to-market motion1 record

Distribution channels2 records

Marketing channels1 record

Core offering

Maruichi Sun Steel Joint Stock Company (SUNSCO) manufactures and sells steel coil and pipe products, including hot-dip 55% Al-Zn coated steel coils (SUNCOAT55), hot-dip galvanized steel coils (CGL), prepainted hot-dip 55% Al-Zn coated steel coils (SUNCOLOR55), and welded steel pipes and tubes. Products are supplied to construction, civil works, structural, home appliance, bicycle/motorcycle, and industrial applications, with the company being the first and only manufacturer in Vietnam authorized to apply the JIS mark.

Product overview

Maruichi Sun Steel Joint Stock Company (SUNSCO) is a steel manufacturing company producing two main product lines: Coil Products and Pipe Products. The coil products include Hot-dip 55% Al-Zn Coated Steel Coil (SUNCOAT55), Hot-dip Galvanized Steel Coil (CGL), and Prepainted Hot-dip 55% Al-Zn Coated Steel Coil (SUNCOLOR55). The pipe products include welded steel pipes and tubes. All products serve construction, civil works, structures, home appliances, and industrial applications. SUNSCO is the first and only manufacturer in Vietnam authorized to apply the JIS mark on its products.

Differentiator

Problem solved

Functional benefit

Products and services

• Hot-dip 55% Al-Zn Coated Steel Coil (SUNCOAT55) Hot-dip 55% aluminum-zinc alloy coated steel coil providing superior corrosion resistance for construction, roofing, structural, and industrial applications. Sold as a core steel coil product line.
• Hot-dip Galvanized Steel Coil (CGL) Hot-dip galvanized steel coil offering corrosion protection for construction, structural, and industrial applications. Core product line of the company.
• Prepainted Hot-dip 55% Al-Zn Coated Steel Coil (SUNCOLOR55) Prepainted aluminum-zinc alloy coated steel coil with color coating for aesthetic and protective purposes in roofing and wall applications.
• Steel Pipes and Tubes Welded steel pipes and tubes for construction, water supply, structural, oil and gas, and industrial applications, meeting JIS, API, ASTM, and BS standards.

Quantifiable outcome

• CO2 emissions reduced by approximately 6,000 tons annually through biomass boiler adoption

Named customers14 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Scale indicators2 records

Recent moves8 records

Expansion highlights5 records

Broad incumbents

• POSCO Holdings: POSCO is a leading Korean steelmaker producing galvanized, galvalume, and prepainted coated steel products for global construction and appliance markets. Comparable as a foreign competitor with superior coated-steel technology and active presence in Vietnam and Southeast Asia.
• Hyundai Steel Company: Hyundai Steel is a major Korean integrated steel producer exporting galvanized coil and welded pipe to Southeast Asia. Comparable as a foreign-coated steel exporter competing with SUNSCO in regional Vietnamese and ASEAN markets.
• Nippon Steel Corporation: Nippon Steel is one of the world's largest steel producers and the originator of many JIS standards. Comparable as a parent-tier Japanese steelmaker that sets the JIS quality benchmark and competes globally in coated steel and line pipe.
• JFE Steel Corporation: JFE Steel is a major Japanese steel producer offering galvanized, coated, and electrical steel products. Comparable as a Japanese incumbent operating in coated steel markets, with strong ties to JIS standards and Japanese customer networks across Southeast Asia.

Direct peers

• Hoa Sen Group: Hoa Sen is Vietnam's largest galvanized steel and steel pipe manufacturer, producing roofing sheets, galvanized coils, and welded pipes for construction. Directly comparable as a domestic competitor in the same Vietnamese coated-steel and pipe markets where SUNSCO operates.
• Nam Kim Steel Joint Stock Company: Nam Kim Steel is a major Vietnamese producer of galvanized steel coils, color-coated coils, and steel pipes. Closely comparable product mix (galvanized coil, color-coated coil, steel pipe) serving Vietnamese construction and industrial customers.
• NS BlueScope Vietnam: BlueScope Vietnam produces ZINCALUME® (55% Al-Zn coated) and COLORBOND® prepainted steel building products for construction. Closely comparable coated steel technology (55% Al-Zn galvalume, color-coated) and overlaps with SUNSCO's SUNCOAT55 and SUNCOLOR55 product lines.
• Ton Dong A Corporation: Ton Dong A is a Vietnamese manufacturer of galvanized and color-coated steel coils for construction and home appliance applications. Comparable as a domestic Vietnamese competitor in coated steel coils with overlapping customer base in roofing and construction.
• Hoaphat Steel Group: Hoa Phat is the largest Vietnamese steel manufacturer, with integrated production of HRC, galvanized coil, and steel pipes. Directly comparable in the Vietnamese steel coil and pipe market with broader scale and a wider product mix than SUNSCO.

Others

• Marubeni Corporation: Marubeni is a Japanese trading conglomerate that both procures steel coil from SUNSCO (Ba Ria Vung Tau project) and trades competing steel products globally. Relevant as both a customer and an adjacent ecosystem participant with deep steel trading flows.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• Facebookfacebook.com/MaruichiSunSteel
• Xx.com/MaruichiSunsco
• LinkedInlinkedin.com/company/maruichi-sun-steel-joint-stock-company

Compliance7 records

Revenue estimate

Valuation estimate

Number of profiles

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 Sun Steel Joint Stock Company