Structural Steel Products

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Structural plate is at the core of what we supply — across a wide range of grades suited to the most demanding offshore, marine and industrial applications. 

• EN10225 S355M / S355MO / S355MLO / S460M / S460MO / S460MLO
• EN10025 S355J0 / S355J2 / S355K2
• API 2W / API 2H Gr.50 / Gr.60
• ASTM A516 Gr.50 / Gr.60 / Gr.70

• Offshore jacket and topsides fabrication
• Subsea mudmats, manifold structures and protection frames
• Offshore wind monopile and jacket foundation fabrication
• Transition pieces and offshore substation structures
• Pressure vessel and storage tank fabrication
• Marine vessel hull and deck plating
• Shipbuilding and ship repair
• Processing plant structures and module fabrication
• Spreader bars and lifting structures
• Weld procedure qualification test plates

Our steel plate is available as a full plate or can be cut and processed to your specifications, including hole cutting and precise quantity supply. We also accept DXF files for your convenience, ensuring you receive the structural steel products you need, including tubulars for structural applications.

Structural sections for primary and secondary steelwork across a broad range of project types. 

• EN10225 S355M / S355MO / S355MLO / S460M / S460MO / S460MLO
• EN10025 S355J0 / S355J2 / S355K2
• ASTM A572 / A992
• AS3679 Gr.300

• Offshore module and topsides structural framing
• Subsea structure internal framing and stiffening
• Processing plant and mineral processing structures
• Conveyor gantries and materials handling structures
• Marine jetty and wharf deck framing
• Wind tower internal structural components
• Mine site buildings, workshops and infrastructure
• Secondary structural steelwork across all sectors

STS supplies structural steel products across the full range of grades and product forms required by energy, resources, marine, and infrastructure projects. From offshore grade heavy steel plate for subsea structures and wind foundations to standard structural sections for processing plants and site infrastructure, we source globally and deliver with full mill certification and documentation. Where Australian domestic supply cannot meet your specification, schedule, or cost requirements, our international mill network can also provide tubulars for structural applications.

• API 2B
• API 5L X52/X60/X65/X70
• EN10210 / EN10219 S355J2H / S460
• ASTM A671
• AS1163 C350L0 / C450L0

• Large diameter transmission pipeline — gas and liquid
• Offshore wind monopile fabrication
• Offshore jacket large diameter nodes and members
• Spreader bars and lifting tubulars
• Marine pile applications requiring large diameter product
• Caisson and conductor pipe
• Offshore jacket chord and brace members
• Subsea structure tubular nodes and connections
• Offshore wind jacket foundation members
• Conductor and caisson pipe for platform and subsea applications
• High-pressure structural applications requiring seamless manufacture

Hollow sections for structural framing, bracing and architectural applications. 

• EN10210 / EN10219 S355J2H
• AS1163 C350L0 / C450L0

• Structural bracing and secondary framing on offshore and onshore structures
• Solar farm support structures and tracker systems
• Marine and port facility structural framing
• Mine site infrastructure and modular buildings
• Civil and transport infrastructure secondary steelwork

Complete piling packages for marine, port, coastal and civil infrastructure applications. 

• Pipe piles
• Sheet piles
• Pile shoes
• Shear keys
• Interlocks
• Tie rods
• Headstocks
• Pontoons
• Gangways
• Corrosion protection systems

• Jetty and wharf foundations
• Quay walls and port retaining structures
• Combi-wall systems for port and coastal infrastructure
• Marine operating facilities
• River and coastal flood defence structures
• Offshore platform and jacket foundation piles

Explosion-bonded clad pipe for applications requiring both structural integrity and corrosion resistance — where solid alloy pipe is cost-prohibitive but carbon steel alone is insufficient. 

Specifications:

• Diameter: DN150 — DN2000
• Clad thickness: 2 — 5mm
• Substrate wall thickness: 6 — 60mm

Typical applications:

• Subsea and topsides pipeline systems in corrosive service
• CCS CO₂ transportation and injection pipelines
• Offshore and onshore process pipelines handling corrosive media
• Pressure vessel cladding for corrosive process service