Corten Steel Plate
Atmospheric corrosion resistant plate that builds its own protective rust instead of paint
Specifications
Alloy Steel Sheet
S550 Q550 High Strength Steel Plate for Welded Structures
550 MPa structural plate for boilers pressure equipment and heavy welded frames
S550 high strength structural steel plate carries a minimum yield strength of 550 MPa, with the S marking it as a structural grade and the 550 giving the yield figure. Boiler shops, pressure vessel fabricators and power station equipment builders reach for it when a welded component must hold pressure or load in a controlled wall thickness. It also sits between the more common structural grades and the top of the high strength range, which gives a designer a step up in strength without moving straight to the heaviest alloy and the welding restrictions that come with it. Plate runs 0-100mm in Q+T, hot rolled or normalized condition and is cut, punched and bent to the drawing before shipment.
- Product Name — S550 High Strength Steel Plate
- Minimum Yield Strength — 550 MPa
- Grade — S550 Q550 E550 1.8904
- Standards — BS EN GB AiSi ASTM DIN JIS
- Sheet Thickness — 0.1mm-10mm or customized as required
Why It Is Specified
Key Benefits of S550 High Strength Structural Steel
550 MPa Minimum Yield Under Controlled Wall Thickness
Pressure parts and load bearing members hold their duty at a smaller wall than a conventional structural grade needs. That matters most where the envelope is fixed by the equipment around it.
A Strength Step That Does Not Jump To the Top
S550 gives a real increase over ordinary structural plate while staying below the heaviest high strength grades, so welding and forming stay within what most shops already run.
Every Designation Filled From One Line
European Chinese and material number designations for this strength level are all covered, so a mixed drawing pack does not turn into several separate purchases.
Choice of Delivery Condition
Q+T, hot rolled and normalized plate are all available, which means the plate arrives in the state your qualified welding procedure assumes.
Parts Rather Than Rectangles
Cutting, punching, bending, decoiling and welding are offered before shipment, so a shell segment or a frame plate arrives close to finished size.
Traceable Grade for the Inspection File
Every shipment carries a mill test certificate against the ordered grade, which is what a pressure equipment inspector will ask to see.
Problems It Solves
What This Material Removes From Your Process
Wall Thickness Limited by the Surrounding Equipment
When a vessel or casing cannot grow outward, the only way to hold the load is a higher yield material. S550 provides 550 MPa minimum yield inside the existing envelope.
Jumping Straight To the Heaviest Grade
Moving from an ordinary structural plate to the very top of the high strength range brings tighter welding and forming controls. S550 is the intermediate step that avoids overshooting.
Multiple Designations for the Same Material
The European Chinese and material number names all describe the same strength level. Supplying them from one line keeps a single purchase order instead of four.
Plate Arriving as Raw Stock
Full plates have to be nested, burned and drilled before any real work starts. Cutting punching and bending before shipment moves that step off your shop floor.
Missing Documentation at Inspection
Pressure work is signed off on paperwork as much as on welds. The mill test certificate arrives with the material so the file is complete.
Application Scenarios
Where It Is Used
Medium and High Pressure Boilers
Boiler structural and shell components where wall thickness is constrained and the design load is high.
High Pressure Vessel Fabrication
Pressure vessel bodies and support structures in process plant built as large welded assemblies.
Power Station Equipment
Frames, casings and support steelwork inside power generation equipment operating under continuous load.
Lifting and Mining Machinery
Lifting machinery members and mining machinery frames that are welded heavy and worked hard every shift.
Large Ships and Bridge Structures
Large welded structural components in shipbuilding and bridge work where strength per unit of weight drives the design.
Earthmoving Machine Structures
Loader, bulldozer and excavator structures where a higher yield plate keeps the section compact around the working geometry.
Who It Is For
Buyers Who Specify This Product
- Boiler and pressure vessel fabricators buying structural plate at a defined 550 MPa yield
- Power station equipment builders sourcing frame and casing plate to a cutting list
- Machine design engineers stepping up from a conventional structural grade without redesigning welding procedures
- Heavy weldment subcontractors quoting large welded components for OEM customers
- Shipyard and bridge fabricators buying high strength plate for large welded sections
- Procurement teams consolidating S550 Q550 E550 and 1.8904 lines into a single order
Technical Data
Specifications and Technical Features
Values below come from the product data published by Shandong Tianyu Metal Products. Confirm the exact grade and size against your order.
| Product Name | S550 High Strength Steel Plate |
|---|---|
| Minimum Yield Strength | 550 MPa |
| Grade | S550 Q550 E550 1.8904 |
| Standards | BS EN GB AiSi ASTM DIN JIS |
| Sheet Thickness | 0.1mm-10mm or customized as required |
| Plate Thickness | 0-100mm |
| Width | 0-1000m or customized as required |
| Size | Customized Size |
| Technique | Q+T hot rolled normalized |
| Surface | Natural or painted |
| Application | Loader bulldozer excavator |
| Processing Service | Bending welding decoiling cutting punching |
| Certificate | Mill Test Certificate |
| Place of Origin | China |
Technical Features
- Minimum yield strength 550 MPa
- Grades S550 Q550 E550 and 1.8904
- Standards BS EN GB AiSi ASTM DIN and JIS
- Plate thickness 0-100mm and sheet 0.1mm-10mm
- Width 0-1000m or customized as required
- Delivery condition Q+T hot rolled or normalized
- Surface natural or painted
- Bending welding decoiling cutting and punching available before shipment
Materials
- High strength structural steel with a minimum yield strength of 550 MPa
- Grade equivalents S550 Q550 E550 and material number 1.8904
- Supplied in the quenched and tempered hot rolled or normalized condition
Certification
- Mill test certificate supplied with each shipment
Manufacturing
How It Is Made and Processed
Hot rolling to the ordered plate gauge
Quenching and tempering or normalizing to the 550 MPa yield level
Decoiling and leveling for lighter gauges
Cutting to plate size or cut profile
Punching and bending to the fabrication drawing
Surface finishing natural or painted
Marking packing and loading for export
Quality Control
Checks Before It Ships
- Mill test certificate raised against the ordered grade and yield level
- Purchase order grade and delivery condition confirmed before processing
- Thickness checked within the ordered range
- Cut profiles and punched hole positions compared with the drawing
- Surface finish inspected as natural or painted per the order
- Bundle marking and protection checked before loading
Customization
What We Can Change on Your Order
- Cut to size plate and profiles from your drawing or nesting file
- Grade supplied as S550 Q550 E550 or 1.8904
- Q+T hot rolled or normalized delivery condition on request
- Bending to the ordered radius before shipment
- Punching for bolted connections
- Natural or painted surface finish
Comparison
S550 High Strength Structural Steel Against the Alternatives
| Ordinary structural carbon steel plate | The 550 MPa minimum yield lets the same load be carried with less plate weight and less deposited weld metal. |
|---|---|
| Thicker sections in a conventional structural grade | Where the equipment around the part fixes the envelope, extra thickness is not available and the higher yield grade is the only route to the load. |
| The top of the high strength plate range | The heaviest grades bring tighter welding and forming controls, while this grade keeps a wider fabrication margin for shops already running standard procedures. |
| Stiffened mild steel built up sections | A single high strength plate member can replace a stiffened assembly, reducing part count and weld length in the weldment. |
Use Guide
Specifying Handling and Welding Notes
- Check whether your governing case is strength or stiffness before paying for the higher yield grade
- Qualify the welding procedure for high strength structural steel and apply preheat on heavier sections
- Keep heat input controlled so the heat affected zone retains its properties
- Use a generous bend radius and bend across the rolling direction where the geometry allows
- State the required delivery condition in the enquiry so the plate is not supplied in the wrong state
- Ask for the mill test certificate at order stage so it is available at inspection
Questions Buyers Ask
S550 High Strength Structural Steel FAQ
What does the 550 in S550 refer to?
It is the minimum yield strength in megapascals. S550 has a minimum yield strength of 550 MPa and the S denotes a structural steel.
Is Q550 the same thing as S550?
S550 Q550 E550 and 1.8904 are the designations covered by this material line. Quote the one used on your drawing and the order will be filled against it.
What sizes and thicknesses are available?
Plate is supplied in 0-100mm, sheet from 0.1mm-10mm, and width is 0-1000m or customized as required. Size is cut to your requirement.
Can we order it normalized rather than quenched and tempered?
Yes. Q+T, hot rolled and normalized conditions are all available. Specify the one your procedures were written around.
Do you supply finished parts or only plate?
Processing covers bending, welding, decoiling, cutting and punching, so you can receive cut and punched parts or plain plate.
What documentation comes with the shipment?
A mill test certificate against the ordered grade ships with the material. Ask for the mill test certificate when you confirm the order.
Are samples available before a full order?
Samples are available. Send the grade, thickness and piece size you want to check and we will confirm what can be released.
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