Corten B Plates for Structural Fabrication
Corten B plate is associated with structural components for buildings, bridge-related fabrication and other exposed steel assemblies. Plate can be incorporated into welded, bolted or riveted construction, with the material and joint requirements set by the design.
For industrial fabricators, the product provides flat stock for designed structural parts and supports. Atmospheric-corrosion resistance is a material characteristic, not a pressure rating or an automatic approval for every chemical or marine environment.
Corten B Plate Dimensions
ASC quotes Corten B plate by thickness, width and length. The offered dimensions and delivery condition are matched to the fabrication schedule, quantity and material requirements.
Plate thickness influences strength requirements, welding procedures and handling. Cutting or other processing requirements can be discussed with the order, without assuming that the raw plate includes a finished fabricated part.
Corten B Plate Supplier, Exporter and Stockist
ASC exports internationally and welcomes Corten B plate enquiries from the USA, the UK and Europe. We supply project material and distributor requirements, with the plate specification and dimensions established in the quotation.
We specialize in fast delivery and give priority to urgent requirements. Availability, dimensions, quantity, inspection scope and destination determine the delivery schedule. Bundles or wooden boxes can be selected to suit the plate and order.
Request a Corten B Export QuoteCorten B Chemical Composition: Producer Reference
The values below are the published ladle-analysis limits for SSAB COR-TEN® B. Use them as a producer-specific comparison reference. The quotation and mill test certificate should identify the actual producer, material designation and applicable specification for the supplied plate, sheet or coil.
| Element | Published limit or range |
|---|---|
| Carbon, C | 0.19 max |
| Silicon, Si | 0.30–0.65 |
| Manganese, Mn | 0.80–1.25 |
| Phosphorus, P | 0.035 max |
| Sulfur, S | 0.030 max |
| Aluminium, Al | 0.020–0.06 |
| Vanadium, V | 0.02–0.10 |
| Copper, Cu | 0.25–0.40 |
| Chromium, Cr | 0.40–0.65 |
| Nickel, Ni | 0.40 max |
Source: SSAB COR-TEN® B product data, reviewed 10 November 2026. These limits are not measured results for an ASC shipment or a universal specification for all weathering steel.
The cited Corten B reference includes vanadium and a lower phosphorus limit than the cited Corten A reference. The letter B alone does not establish ASTM A588 Grade B compliance; the required specification and material records must match the order.
Corten B Mechanical Properties: Producer Reference
For the 2.00–40.00 mm thickness range described in the cited SSAB COR-TEN® B product data, the published tensile-property minima are:
| Property | Producer reference |
|---|---|
| Yield strength, ReL | 345 MPa minimum |
| Tensile strength, Rm | 485 MPa minimum |
| Elongation, A50 | 19% minimum |
SSAB states that these mechanical properties are tested transverse to the rolling direction. A50 refers to a 50 mm gauge length. Source: SSAB COR-TEN® B product data. The producer range is not an ASC stocked-size promise.
These tensile values do not establish a completed member’s allowable load or its impact toughness. Include any required impact test, delivery condition and inspection documents in the plate enquiry. Bending and welding requirements should be reviewed for the actual thickness and fabrication detail.
Welding and Structural Connections
The welding procedure should account for plate thickness, composition, restraint and service conditions. For unpainted exposed joints, compatible weld-metal weathering performance is also important.
Bolted or riveted details need suitable connection design and drainage. Crevices, debris traps and details that remain wet can affect local weathering even when the main plate surface dries freely.
Corten B Weathering Performance
Weathering steel forms a protective surface most effectively where it experiences wetting and drying. This can reduce reliance on a conventional paint system in suitable applications, but it does not make the material maintenance-free in every environment.
Persistent dampness and significant chloride exposure require assessment. Run-off can stain adjacent materials, so drainage and the position of exposed plates matter to the completed structure.
Corten B and ASTM A588 Grade B
Corten B and ASTM A588 Grade B are different names with different technical meanings. The B in a material description should not be treated as proof that the plate complies with ASTM A588 Grade B.
| Designation | Relationship |
|---|---|
| Corten B | Weathering-steel plate description; compliance follows the supplied specification and records. |
| ASTM A588 Grade A / Grade B | Defined ASTM grades with separate chemical limits and thickness-dependent properties. |
| S355J0W / S355J2W | EN 10025-5 weathering grades with distinct impact qualities. |
| Corten A | A different weathering material description, commonly associated with phosphorus-alloyed flat products. |
Equivalent-grade or dual-compliance claims require the complete specifications and supporting material documents.
Plate Documents and Inspection
Mill test certificates and additional inspection can be requested for Corten B plate orders. The agreed supply scope can include the required material designation, delivery condition and project-specific acceptance requirements.
Corten B Plate FAQs
What are Corten B plates used for?
They are used in specified structural and industrial fabrications where atmospheric-corrosion resistance is important, including exposed building components and bridge-related steelwork. The engineering design determines the appropriate plate and testing.
Is Corten B identical to ASTM A588 Grade B?
No automatic identity should be assumed. ASTM A588 Grade B is a defined ASTM grade. Corten B is a material description, and compliance must be established from the supplied specification and documents.
How is Corten B different from Corten A?
The material descriptions differ in composition and typical application emphasis. Corten B is associated with structural plate, while Corten A commonly appears in phosphorus-alloyed architectural and flat-product applications. Neither name establishes a universal substitute for the other.
What dimensions can ASC quote for Corten B plate?
ASC quotes the required thickness, width and length against the material specification and order quantity. Available dimensional combinations are confirmed with the offer.
Can Corten B structures be left unpainted?
They can be where the design and exposure support protective weathering. Drying, drainage, chloride exposure and staining of adjacent finishes should be assessed before selecting unpainted use.
Does Corten B need special consideration when welded?
The welding procedure and consumables must suit the composition, thickness, joint and service. Exposed unpainted welds also need appropriate weathering performance.
Can I request impact testing or additional inspection?
Yes. Project-specific impact testing and additional inspection can be requested and agreed with the order. Tensile properties alone do not establish impact toughness.
What affects Corten B export price and delivery?
Plate dimensions, quantity, material requirements, testing, availability and destination influence the quotation. ASC prioritizes urgent requirements and offers suitable bundle or wooden-box packing.