Corten B Pipes and Tubes for Exposed Steelwork
Amardeep Steel Centre LLP supplies Corten B pipes and tubes for fabricators, engineering contractors and architectural projects. Circular, square and rectangular sections offer different connection and visual possibilities, from slim exposed supports to framed screens and equipment structures. We work from the section schedule and material requirements so the quotation describes the product the drawing actually needs.
A hollow section concentrates steel around its perimeter and presents a closed external profile. Round tubes give a continuous curved surface; square and rectangular tubes provide flat faces for brackets, plates and adjoining members. The weathering-steel finish can become part of an exposed design rather than being hidden behind a decorative paint colour. Select the shape and wall thickness for the engineering duty first, then coordinate the desired surface appearance.
Send your section sizes, lengths, quantities and destination through our Corten B tube enquiry form. Include the applicable product standard and drawing revision where the material is being purchased for an approved design.
Round, Square and Rectangular Corten B Tubes
Round Pipes and Circular Hollow Sections
Round sections are described by outside diameter, wall thickness and length. They are useful for exposed posts, circular framing details and assemblies where the curved profile is part of the appearance. A saddle connection, end plate or intersecting tube needs dimensions that match the actual outside diameter. If your schedule uses nominal pipe size and a wall schedule, include the dimensional standard as well: a nominal pipe number is not the same as a measured outside diameter.
Square Hollow Sections
Square Corten B tubes provide four flat faces and a compact outline for frames, architectural supports and repetitive modular assemblies. The outside side dimension and wall thickness identify the basic size, while corner radius, straightness and end squareness affect fabrication fit. Show where plates or brackets sit near a corner so the fabricator can allow for the rounded transition rather than treating the section as a sharp-cornered box.
Rectangular Hollow Sections
Rectangular tubes provide different depths in two directions. This can help align a member with a façade grid or position the deeper dimension in the design’s principal loading direction. State height and width in a consistent order and identify the orientation on drawings. A rotated rectangular section can fit the same opening yet behave differently under load, so orientation belongs in the schedule rather than being left to the workshop.
Dimensions and Supply Specification
| Order detail | Information that defines the tube |
|---|---|
| Round section | Outside diameter × wall thickness × length, or nominal size with the stated dimensional standard. |
| Square section | Outside side × outside side × wall thickness × length; corner requirements where relevant. |
| Rectangular section | Outside height × width × wall thickness × length, with orientation identified. |
| Material and product standard | Corten B material identity, finished-tube specification, delivery condition and required inspection document. |
| Production and joints | Specified production route, longitudinal seam requirements, end preparation and weld examination where required. |
| Tolerances and quantity | Dimensional and length tolerances, straightness, piece quantities or tonnage and item references. |
Available combinations of section, wall and length are checked against the enquiry. For repetitive fabrication, provide a cutting list as well as the total quantity: this allows stock-length choices, offcuts and identification to be considered together. A tube that must slide inside another part, accept an internal sleeve or fit a finished opening needs those functional dimensions called out explicitly.
Corten B Material and Finished-Tube Properties
Corten B is a weathering-material designation; a tube order also needs the requirements for the finished tubular product. The material certificate describes the heat chemistry and tested properties, while the tube specification addresses manufacture, dimensions and the examinations needed for acceptance. This distinction is particularly important when a design names an ASTM or EN product standard.
Corten B Base-Material Reference
The flat-material reference below explains the Corten B alloying system and base strength. The values describe SSAB COR-TEN B hot-rolled flat material in its published 2–40 mm product range. Use the ordered material specification and inspection certificate for acceptance.
| Element | Ladle analysis, mass % |
|---|---|
| Carbon C | 0.19 maximum |
| Silicon Si | 0.30–0.65 |
| Manganese Mn | 0.80–1.25 |
| Phosphorus P | 0.035 maximum |
| Sulfur S | 0.030 maximum |
| 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 maximum |
| Base-material property | Published minimum |
|---|---|
| Yield strength | 345 MPa |
| Tensile strength | 485 MPa |
| Elongation A50 | 19% |
Reference: SSAB COR-TEN B product data, checked 27 October 2026. Mechanical tests are transverse to rolling. These are base-material values; finished-product acceptance and design must also address forming, welding, section geometry and the applicable product tests.
Fabrication, Connections and Inspection
For welded tube orders, specify the production route and finished seam inspection required by the project. Subsequent cutting, drilling and welding should follow procedures suitable for the supplied material and the intended service. Mark visible faces and seam orientation where the finished assembly has an architectural role; this helps coordinate appearance with brackets, base plates and connecting members.
Inspection can include outside dimensions, wall thickness, length, straightness, end condition and the specified weld examinations. Heat or batch identification should remain connected to cut pieces when traceability is required. State material certificate, impact testing and third-party witness requirements before ordering so the inspection plan and delivery documents match the purchase order.
Industries and Typical Applications
| Buyer or application | Why this section is considered |
|---|---|
| Architectural fabrication | Exposed frames, posts and screen supports with a consistent weathering-steel appearance. |
| Building and infrastructure contractors | Designed hollow-section members, connections and external assemblies specified by the engineer. |
| Industrial equipment fabricators | Support frames and drawing-defined structures where the external exposure suits weathering steel. |
| Landscape and public-space projects | Frames associated with signs, screens and street furniture, with appropriate stability and drainage details. |
Pressure-containing duties need a separate material and design-code assessment. A structural tube should not be selected for a conveyed fluid solely because its exterior develops a patina. For connected direction-changing components, our fabricated Corten steel elbows are quoted against the specified geometry and service rather than a generic pressure class.
Exposure, Packing and Project Delivery
Tube ends, base connections and attachments should prevent water being trapped where the steel cannot dry. Assess the inside of a hollow section separately from its exposed outer faces, particularly where condensation or water entry is possible. Coastal spray, de-icing salts and continuously damp enclosures can make bare weathering steel unsuitable. Route initial weathering run-off away from light stone and other sensitive finishes.
For domestic or export orders, identify the destination, required delivery date and unloading restrictions. Bundles should preserve item identification and protect the ends from handling damage. Provide the cutting schedule early if the material must arrive ready for a sequenced fabrication programme. The related Corten B plate range can be included in the same enquiry for separately specified connecting plates and fabricated details.
Frequently Asked Questions
What is the difference between Corten B pipe and tube?
The terms are often used commercially for tubular products. A purchase order should identify the actual outside dimensions, wall thickness and product standard. For pressure service, nominal size and schedule alone are not enough; the material and governing piping requirements must also be established.
Can I enquire for round, square and rectangular sections?
Yes. Send a schedule separating each shape and size, including wall thickness, lengths and quantity. For rectangular sections, identify the installed orientation. Available combinations and the offered production route are confirmed in the quotation.
Is Corten B the same as ASTM A847?
No automatic equivalence should be assumed. A847 is a finished structural-tubing specification. A Corten B trade description or flat-material certificate does not establish compliance with its full manufacturing and testing requirements.
Which chemical and mechanical values apply to the tube?
Use the specified finished-product requirements and the material documents supplied for the order. The Corten B flat-material table on this page is a labelled reference, not a replacement for the tube’s required test results.
Can these tubes be used for fluid pressure service?
Only when the material, manufacture, design and inspection satisfy the applicable service and piping requirements. Improved atmospheric-corrosion resistance is not a pressure rating or evidence of resistance to a particular fluid.
How should I specify cut lengths?
List each finished length, quantity and permissible variation, together with the section size. Include end preparation, hole positions and item marks where they form part of the supply. This is more useful than total tonnage alone for fabrication planning.
Does the rust-coloured surface mean the tube is ready for any outdoor site?
No. Site exposure and detailing matter. The designer should assess salt contamination, water traps and internal moisture, and provide a practical way for exposed surfaces to dry.
What documents should accompany an enquiry?
Send the section schedule or drawing, required material and product standards, inspection requirements and destination. If a mill certificate, impact testing or independent inspection is needed, request it before the order is placed.
Request a Corten B Pipe and Tube Quotation
Contact Amardeep Steel Centre LLP with the section shape, dimensions, wall thickness, lengths and quantity. Add your material specification, inspection requirements and delivery destination so we can prepare a product-specific offer. Email deepak@amardeepsteelllp.com or call +91-8591210578.