Steel & Rebar Manufacturers in Indonesia: Krakatau, GRP, Master Steel
Looking for a rebar manufacturer or steel mill in Indonesia? As of 23 October 2026 this list includes only addresses and products stated on official websites or public directories (source in each table row). Krakatau Steel has its head office at Wisma Krakatau Steel, Jl. Asia Raya Kav. O.3, Cilegon, with the plant at Cilegon (Cigading), Banten; its website lists Hot Rolled Coil/Plate, Cold Rolled Coil/Sheet and Wire Rod. Its subsidiary Krakatau Wajatama makes deformed/plain rebar and sections (L, H, I, WF, UNP) at Jl. Industri No.5A, Cilegon. Gunung Raja Paksi (Cikarang Barat, Bekasi), founded in 1970 in Medan with 1.2 million tonnes a year, makes plate and coil (flat), not rebar. Master Steel (Jakarta) offers Ø6–50 mm deformed and plain bar, wire mesh and PC strand since 1972. Ispat Indo (Sidoarjo) produces billet, round bar, deformed bar and wire rod, above 700,000 tonnes a year.
Steel and rebar manufacturer list
| Company | Location / address | Products (per source) | Notes | Source |
|---|---|---|---|---|
| Krakatau Steel | Kantor pusat: Wisma Krakatau Steel, Jl. Asia Raya Kav. O.3, Cilegon 42435; pabrik Cilegon (Cigading), Banten | Hot Rolled Coil/Plate, Cold Rolled Coil/Sheet, Wire Rod | Flat steel and wire rod | Krakatau Steel |
| Krakatau Wajatama | Jl. Industri No.5A, Ds. Rama Nuju, Cilegon | Deformed/plain rebar; L, H, I, WF, UNP sections | Krakatau Steel subsidiary; KS-branded rebar | Daftar.co |
| Krakatau Wajatama (merek KS) | Cilegon, Banten | KS rebar (seller listing) | Source: seller listing, not the mill site | Indonetwork |
| Gunung Raja Paksi | Jl. Perjuangan No.15, Sukadanau, Cikarang Barat, Bekasi 17530 | HRC, steel plate, coil plate; slab 1.2 million t/yr | Founded 1970 in Medan; flat products, not rebar | Gunung Raja Paksi |
| Master Steel | Kantor pusat: M@COKRO49 #107, Jl. HOS Cokroaminoto 49, Menteng, Jakarta Pusat 10350; tel. +62-21 3983 7700 | Deformed and plain bar Ø6–50 mm, coil bar Ø6–16 mm, wire mesh, PC strand, wire rod Ø4.5–16 mm, PC wire | ISO 9001/14001/45001; since 1972; factory addresses not verified | Master Steel |
| Ispat Indo | Jl. Gajah Mada, PO Box 1083, Taman, Sidoarjo; tel. +62 31 7887000 | Billet, round bar, deformed bar, wire rod | >700,000 t/yr; SNI 07-2052-2002 stated; subsidiary Ispat Wire Products | Steel Indonesia |
| Asian Profile Indosteel; Bhirawa Steel; Gunawan Dianjaya Steel | Surabaya (Kalianak/Tandes): Jl. Margomulyo Permai 32 Kav 9; Jl. Margomulyo No.06; Jl. Margomulyo No.29A | Not verified | IISIA members; address only from directory | IISIA |
| Growth Sumatra Industri; Gunung Gahapi Sakti | Medan (Mabar): Jl. K.L. Yos Sudarso Km.10; Jl. Medan Belawan KM.10 | Not verified | IISIA members; address only from directory | IISIA |
| Bintang Timur Steel; Citra Baru Steel; Galunggung Indosteel Perkasa | Banten: Kawasan Milenium Industri Blok E-1, Tigaraksa; Kawasan Industri Modern Cikande; Jl. Raya Serang Km 14,8 No.60, Cikupa | Not verified | IISIA members; address only from directory | IISIA |
Data as of 23 October 2026 from company websites and public directories; capacity, products and addresses may change. "Not verified" means products were not checked on a mill page. Master Steel factory addresses could not be verified on a live page, so only the head office is shown.
Mill vs distributor: what it means for buyers
Mills generally sell large volumes through authorised distributors; small and medium projects buy from building-material stores or distributors. For retail rebar prices per bar see the rebar price article, and check SNI marking and weight per metre for authenticity.
Choose the mill by product
For reinforced concrete look for deformed-bar producers (e.g. Krakatau Wajatama, Master Steel, Ispat Indo); for steel frames, roofing and plate look for flat or section producers. Gunung Raja Paksi is listed for flat products, so it is not a source of deformed rebar.
Buyer tips
- Ask for the mill certificate and SNI certificate.
- Check weight per metre, not just diameter.
- Confirm brand and delivery location in a written quote.
- Contact mills directly only for large volumes.
Request a steel rebar manufacturers in Indonesia quote for your project
homeX can compare several brands at once and prepare a written quote for projects, renovations or shop stock. Send your needs (brand, size, quantity, location) via WhatsApp +62 821 1818 998, or visit the homeX showroom: Priskilla Tower, 6th floor, Jl. Atang Sanjaya No.21, Benda, Kota Tangerang, Banten 15125.
Disclaimer: prices change without notice and differ by store, city, pack size, grade and promotion. Data as of 23 October 2026; always confirm with the seller before buying.
FAQ
Biggest rebar mill in Indonesia? We could not verify a single public ranking; Krakatau Wajatama, Master Steel and Ispat Indo are among the rebar makers listed in the sources.
Where is the Krakatau Steel plant? Cilegon (Cigading), Banten; head office at Jl. Asia Raya Kav. O.3, Cilegon.
Does Gunung Raja Paksi make rebar? Its website lists HRC, plate and coil plate, not rebar.
Steel rebar manufacturers in Indonesia: related articles and products
Related articles:
Related products at homeX:
Price sources (checked 23 October 2026): Krakatau Steel — Official website; Daftar.co — Cilegon steel mill directory; Indonetwork — KS rebar listing; Gunung Raja Paksi — Company profile; Master Steel — Products page; Steel Indonesia — Ispat Indo profile; IISIA — Member directory.