Heavy-Duty Structural Steel Fabrication · Melbourne
Melbourne's Heavy-Duty Structural Steel Fabrication Workshop.
For builders, developers and engineers specifying engineer-grade heavy duty steel — long-span beams, multi-storey columns, portal frames and welded structural assemblies fabricated to AS/NZS 1554 and AS/NZS 5131. Drawing to delivery, all under one Dandenong roof.
The Definition
What "Heavy-Duty" Means in Structural Steel Fabrication
Most Melbourne steel shops handle light-to-medium gauge — domestic verandahs, single-storey sheds, decorative metalwork. We're built for what comes after that: engineered, load-bearing structural steel where members carry serious load and the welding has to be certifiable.
Heavy-duty structural steel fabrication at 8 Star means long-span beams up to 13.5 m single-pass, welded I-sections up to 800 × 300 mm, multi-storey columns, portal frame systems and tube/CHS up to 900 mm Ø. Every piece supplied with mill certificates, batch traceability, and welding to AS/NZS 1554.1.
Builder-First Fabrication
What Builders Need from a Heavy-Duty Steel Partner
Architects care about aesthetics. Engineers care about specifications. Builders care about cost, program and trade coordination — and a heavy-duty steel partner who only optimises for one of those will let the project down somewhere else.
Capacity
Workshop that can absorb 5–50 tonne packages without subcontracting the heavy pieces to unfamiliar subcontractors.
Documentation
Shop drawings, mill certs, weld inspection records — what your engineer, certifier and building surveyor will ask for at sign-off.
Predictable Program
Realistic lead times quoted upfront, with weekly progress checkpoints once fabrication is underway. No surprises on site delivery date.
One Point of Contact
One project lead from quote to install. No handoffs between fabricator, finisher, deliverer and installer — all one workshop.
Capabilities
Three Heavy-Duty Steel Capabilities
Beyond standard structural rolled sections — when the project needs scale, custom geometry or load-rated welded assemblies.
Heavy I-Section & Beam Fabrication
UB, UC and welded I-sections up to 800 × 300 mm — for long-span warehouse roofs, transfer beams and multi-storey residential framing.
- UB / UC / PFC standard rolled sections
- Custom welded plate girders
- Drilling, coping, end-plate detailing
- AS/NZS 1554.1 SP welding
Heavy Tube & CHS / RHS / SHS Cutting
In-house laser tube cutting up to 900 mm Ø and 13.5 m single-pass — weld-ready members with ±45° bevel cuts straight off the machine.
- CHS, SHS, RHS profiles up to 900 mm Ø
- Laser bevel cutting in single pass
- Capacitive height sensing for plate thickness variation
- Up to 25 mm wall thickness
Portal Frames & Heavy Assemblies
Single and multi-span portal frames, mezzanine systems, multi-storey columns — full assemblies shop-fitted before delivery.
- Single-span portal frames up to 30 m
- Multi-storey columns with consistent finish
- Mezzanine floors and structural platforms
- Trial-fit and bolt-up before dispatch
Section Profiles
The Heavy Structural Steel Sections We Fabricate
If your engineer's drawing calls for it, our workshop likely cuts, welds and finishes it weekly. A working reference of the heavy duty steel profiles we keep moving through the shop — supplied with mill certificates on request.
150 UB 14 through 610 UB 125 — primary horizontal load-carriers for floors, roofs and transfer levels.
100 UC through 310 UC — vertical members for multi-storey work, posts, columns and portal-frame legs.
75 PFC up to 380 PFC — lintels, edge beams, stair stringers and architectural exposed steel.
50 × 25 through 400 × 300 RHS — bracing, columns, posts and tube-to-tube connections.
25 × 25 up to 400 × 400 SHS — posts, frame members, architectural exposed columns.
Up to 900 mm Ø via laser tube cutter — large-bore columns, telecom poles, architectural features.
Up to 25 mm thick plate — for cleats, base plates, gussets, custom welded I-sections.
Various widths up to 200 mm — stiffeners, connection plates, custom bracketry.
25 × 25 through 200 × 200 — bracing, framing, edge supports.
Industries
Heavy Duty Steel Across Three Industries
Each industry has its own load conditions, program rhythms and compliance documents. Click through for the dedicated industry page.
Residential
House extensions, transfer beams, basement steel, modern home framing — heavy structural steel for custom and prestige residential builds.
Residential Structural SteelCommercial
Multi-storey commercial framing, retail and office structural steel, mixed-use projects — heavy duty steel to engineer drawings and program.
Commercial Structural SteelWarehouse & Industrial
Portal frames, industrial sheds, mezzanine floors and heavy bracket assemblies — for warehousing, distribution and industrial buildings.
Warehouse Structural SteelWhy Specify Us
Why Builders Choose 8 Star for Heavy-Duty Fabrication
Five things Melbourne builders tell us they look for in a heavy duty steel partner — and where most small-to-medium fab shops fall short.
Workshop Built for Heavy
800 × 300 mm welded I-section capacity, 900 mm Ø tube laser, 13.5 m single-pass. No subcontracting the big pieces to someone else.
Finishes Managed From One Workshop
Two-pack paint and powder-coat in-house, hot-dip galvanising through our partner galvaniser — one point of contact, no quality gap between fabrication and finishing handover.
Craft Welding Background
30+ years of power-station boiler-making in the workshop — discipline that shows up in clean, certifiable structural welds.
Documentation Built for Sign-Off
Shop drawings, mill certificates, batch numbers, welder qualifications — what your engineer and certifier will ask for.
One Point of Contact
From quote to installed steel — one project lead, one quote, one invoice. No subcontracting handovers mid-project.
Workflow
Five-Stage Heavy-Duty Steel Fabrication Process
Same process for a 5-tonne residential package or a 50-tonne commercial frame. Project lead stays the same person from quote to install.
Drawing Review
Send engineer-stamped drawings or models. We assess scope, weldability and program fit.
Itemised Quote
Line-by-line quote — material, labour, finish, delivery — with lead time committed in writing.
Shop Drawings
Detailed shop drawings issued for sign-off by your engineer before any cutting starts.
Fabrication & Finish
Cut, weld, drill, finish — paint or powder-coat in-house, hot-dip galvanising via our partner galvaniser — full QC before dispatch.
Delivery & Install
Crane-truck delivery, site-coordinated install, mill certs and weld records handed over.
Standards & Compliance
Heavy-Duty Steel Fabrication — Standards We Work To
Engineer-stamped, certifier-ready, building-surveyor approved. The compliance set we deliver with every heavy duty steel package.
Australian Standards
- AS/NZS 1554.1 — Structural steel welding
- AS/NZS 5131 — Fabrication construction categories
- AS/NZS 4680 — Hot-dip galvanising
- AS 4100 — Steel structures (engineer-side)
- AS/NZS 1252 — High-strength structural bolts
Documentation Pack
- Stamped shop drawings for sign-off
- Material mill certificates & batch traceability
- Welder qualification records on request
- Weld inspection reports (visual + NDT if specified)
- Galvanising certificates & coating thickness reports
Recent Projects
Recent Heavy-Duty Structural Steel Projects
A snapshot of recent heavy duty structural steel packages across Melbourne — residential transfer beams, prestige residences and design-led builds.
Quote Heavy-Duty Structural Steel for Your Melbourne Project
Send engineer drawings, sketches or a site address — we'll review the steel scope and come back with buildability notes, fabrication options and an itemised quote.