S235JR Cold Formed Square Tube Industrial Use Square Hollow Section for Structural Frames
Product Details
S235JR Square Tube
,Cold Formed Square Hollow Section
,Industrial Use Square Tube
S235JR Square Tube Carbon Steel Square Tube for Industrial Use
Material
S235JR is a non-alloy structural (mild) carbon steel grade used for general-purpose load-bearing fabrication. In cold-formed square hollow sections (SHS), steel strip/plate is roll-formed at ambient temperature, welded (typically high-frequency), and then sized to achieve stable geometry and consistent dimensions.
Note on designation: for European hollow sections, the grade is often specified as S235JRH under EN 10219 (the “H” suffix indicates hollow section). Cold-formed SHS produced to EN 10219 is a common way to purchase “S235JR square tube” for structural/industrial frames.
Specifications
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Shape: Square Hollow Section (SHS) / Square Tube
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Manufacturing: Cold formed + welded + sizing
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Typical OD range (customizable): 20×20 mm up to 400×400 mm
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Typical wall thickness (customizable): 1.5–16.0 mm (heavier walls available by agreement)
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Length options: 6 m / 12 m / cut-to-length
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Ends: Plain, deburred, or beveled (upon request)
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Surface options: Black (mill finish), oiled, shot-blasted, zinc-coated / hot-dip galvanized (upon request)
Main Features
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Reliable strength-to-weight ratio for frames, racks, supports, and welded assemblies
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Excellent weldability and workshop fabrication performance (cutting, drilling, punching)
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Clean appearance and stable geometry after sizing—ideal for exposed structures and modular fabrication
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Closed-section stiffness improves torsional rigidity versus open sections
Our Advantages
Q1: “Which standard should I specify—EN 10219 or EN 10210?”
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We help you choose correctly: EN 10219 = cold-formed, EN 10210 = hot-finished. Cold-formed tubes are typically selected for cost efficiency and precise geometry; hot-finished is often chosen when hot-finish performance is required by design.
Q2: “Can you control dimensional tolerances and corner quality?”
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We control OD, wall thickness-on-flats, straightness, and corner consistency per the requested standard (e.g., EN 10219-2 tolerances). For projects referencing US-style tolerance practices, we also follow recognized measurement methods (e.g., avoid weld-seam area for thickness checks; corner radius limits for square/rectangular tubing).
Q3: “Do you provide full traceability and inspection documents?”
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Each bundle can be traceable by heat number, and we provide inspection documents (MTC) so buyers can verify grade/standard, heat/lot, and test results.
Q4: “Is weld seam quality reliable for fabrication?”
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We focus on stable forming + welding parameters and post-weld sizing to ensure consistent seam integrity and smooth fabrication performance (especially important for load-bearing frames and repetitive production).
Q5: “Can you support processing and delivery requirements?”
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Cut-to-length, end finishing, bundling/labeling, protective packing, and export documentation are available to reduce your receiving and fabrication time.
Chemical Composition
| Grade | Reference Standard (typ.) | C (max) | Si (max) | Mn (max) | P (max) | S (max) | N (max) | Cu (max) |
|---|---|---|---|---|---|---|---|---|
| S235JR | EN 10025-2 | 0.17 | — | 1.40 | 0.035 | 0.035 | 0.012* | 0.40 |
| S235J0 | EN 10025-2 | 0.17 | — | 1.40 | 0.030 | 0.030 | 0.012 | 0.40 |
| S235J2 | EN 10025-2 | 0.17 | — | 1.40 | 0.025 | 0.025 | — | 0.40 |
| S275JR | EN 10025-2 | 0.21 | — | 1.50 | 0.035 | 0.035 | 0.012 | 0.40 |
| S355JR | EN 10025-2 | 0.24 | 0.55 | 1.60 | 0.035 | 0.035 | 0.012 | 0.55 |
Mechanical Properties
| Grade | Yield Strength ReH (min, MPa) | Tensile Strength Rm (MPa) | Elongation A (min, %) | Impact Requirement (typ.) |
|---|---|---|---|---|
| S235JR | 235 | 360–510 | 26 | 27 J @ +20°C |
| S235J0 | 235 | 360–510 | 26 | 27 J @ 0°C |
| S235J2 | 235 | 360–510 | 26 | 27 J @ −20°C |
| S275JR | 275 | 410–560 | 23 | 27 J @ +20°C |
| S355JR | 355 | 470–630 | 22 | 27 J @ +20°C |
Execution Standards (ASTM / EN / GOST / JIS / GB)
EN (Europe)
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EN 10219-1: Cold formed welded structural hollow sections — technical delivery conditions
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EN 10219-2: Tolerances, dimensions and sectional properties
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EN 10025-2: Non-alloy structural steels (basis for S235/S275/S355 grade definitions)
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EN 10204: Inspection documents (MTC types such as 3.1/3.2) (commonly requested)
ASTM (USA)
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ASTM A500/A500M: Cold-formed welded and seamless carbon steel structural tubing in rounds and shapes (square/rectangular included)
JIS (Japan)
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JIS G 3466: Carbon steel square and rectangular tubes for general structure
GB (China)
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GB/T 6728: Cold forming sectional steel for general structure (square/rectangular hollow sections included)
GOST (Russia/EAEU)
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GOST 30245: Steel bent closed welded square and rectangular sections for building structures
Application Areas
Main industries: steel structures, industrial equipment, fabrication workshops, logistics & storage, infrastructure supports, energy and utility frames.
Typical uses inside these industries
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Structural framing: columns, beams, trusses, bracing members
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Industrial equipment: machine bases, guards, platforms, conveyors
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Racking & logistics: pallet racks, mezzanines, shelving frames
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Vehicles & transport: trailer frames, subframes, reinforcements
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Energy & utilities: support frames, skids, mounting structures
Q: Are you trading company or manufacturer ?
A: manufacturer,also can do trading.
Q: How long is your delivery time?
A: Generally speaking,it is 10-15 days if the goods are in stock,or it is 30-40 days if the goods are not in stock,
it is according to quantity.
Q: Do you provide samples? is it free or extra ?
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
Q: What is your terms of payment ?
A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.
If you have another question, pls feel free to contact with me.
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