Hot Finished Structural Hollow Seamless Steel Tube Seamless Cold Drawn Steel Tube
Hot Finished Structural Hollow Seamless Steel Tube & Seamless Cold Drawn Steel Tube
Material
This product range covers seamless steel tubing made for structural load-bearing and precision mechanical applications:
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Hot-finished structural hollow sections: produced by hot forming/hot finishing to deliver stable geometry, strong load capacity, and reliable toughness for structures.
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Seamless cold-drawn tubes: produced by cold drawing (often with subsequent heat treatment) to achieve tight dimensional tolerances, controlled surface quality, and consistent mechanical performance for engineered parts. (Source: botopsteelpipes.com)
Specifications
Typical supply scope (customizable):
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Outside Diameter (OD): small OD to large OD (project-based)
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Wall Thickness (WT): light wall to thick wall (strength-driven)
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Length: fixed length or random length, cut-to-length available
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Shape: round / square / rectangular (structural hollow sections), round (precision tubes)
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Manufacturing route: hot finished (structural) / cold drawn (precision)
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Delivery condition: as-hot-finished, normalized (+N), stress relieved (+SR), annealed (+A), etc. (per selected standard/grade)
Key Features
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Seamless integrity: no weld seam, reducing weld-related risk points under load and during forming/machining.
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Structural reliability: hot-finished hollow sections provide predictable strength and toughness for fabricated structures. (Source: botopsteelpipes.com)
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Precision capability: cold-drawn tubes are designed for precisely defined tolerances and specified surface roughness, supporting tight-fit assemblies and consistent performance. (Source: botopsteelpipes.com)
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Good processability: suitable for cutting, drilling, bending, welding (grade-dependent), and machining.
Our Advantages
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Certificates, traceability, and compliance-ready documentation
We supply mill documentation aligned with common purchasing requirements (e.g., EN 10204 Type 3.1 / 3.2 when specified) to support inspections, third-party witnessing, and project acceptance. (Source: coremetsteel.com) -
Dimensional control for both “structure” and “precision” use-cases
For structural hollow sections, we focus on geometry stability for fabrication and erection; for cold-drawn tubes, we support projects where dimensional accuracy and surface quality are critical purchasing indicators. (Source: botopsteelpipes.com) -
Quality inspection options matched to risk and service condition
Typical buyer concerns include mechanical performance verification and inspection scope. For EN structural hollow sections, the standard framework references testing/inspection approaches (including NDT routes in applicable cases); we can align inspection plans (e.g., dimensional checks, mechanical tests, NDT where required) with your specification and acceptance level. (Source: testinglab.net)
Chemical Composition
| Grade (Example) | Standard Family | C (max / range) | Si (max / range) | Mn (max / range) | P (max) | S (max) |
|---|---|---|---|---|---|---|
| S355J2H | EN 10210-1 | 0.22 max | 0.55 max | 1.60 max | 0.03 max | 0.03 max (Source: caishuku.com) |
| S235JRH | EN 10210-1 | 0.20 max | — | 1.40 max | 0.04 max | 0.04 max (Source: caishuku.com) |
| E355 (1.0580) | EN 10305-1 | 0.22 max | 0.55 max | 1.60 max | 0.025 max | 0.025 max (Source: steelpipesfactory.com) |
| 1026 | ASTM A519 | 0.22–0.28 | — | 0.60–0.90 | 0.040 max | 0.050 max (Source: seamless-pipes.com) |
| STKM13A | JIS G3445 | 0.25 max | 0.35 max | 0.90 max | 0.04 max | 0.04 max (Source: h2abc.com) |
Mechanical Properties
| Grade (Example) | Typical Use | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) |
|---|---|---|---|---|
| S355J2H | Hot-finished structural hollow section | ≥355 (thin wall; thickness-dependent) | 470–630 (typical range) | — (Source: metaldata.info) |
| S235JRH | Hot-finished structural hollow section | ≥235 (≤16 mm reference) | — | — (Source: botopsteelpipes.com) |
| E355 (EN 10305-1) | Seamless cold-drawn precision tube | ≥355 (in +N example) | 490–630 (in +N example) | 22 (in +N example) (Source: steelpipesfactory.com) |
| 1026 (ASTM A519) | Seamless mechanical tubing | ≥448 (min) | ≥517 (min) | ≥10 (Source: seamless-pipes.com) |
| STKM13A (JIS G3445) | Machine-structure tube | ≥215 | ≥370 | ≥30 (L); ≥25 (T) (Source: h2abc.com) |
Applicable Standards
Selection depends on your project region and inspection requirements:
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EN: EN 10210-1 (hot finished structural hollow sections); EN 10305-1 (seamless cold drawn precision tubes)
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ASTM: ASTM A519 (seamless mechanical tubing) (Source: seamless-pipes.com)
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JIS: JIS G3445 (carbon steel tubes for machine structure) (Source: h2abc.com)
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GOST: GOST 8732 / GOST 8731 (seamless hot-worked pipes commonly specified in CIS markets) (Source: tubingchina.com)
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GB: GB/T 8162 (Seamless steel tubes for structural purposes) (Source: openstd.samr.gov.cn)
Application Areas
Broad fields: construction & steel structures, mechanical engineering, automotive & transport equipment, energy & industrial facilities.
Where the tubes are used (examples):
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Structural engineering: columns, trusses, frames, bracing members, handrails, platforms, lifting frames
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Machinery manufacturing: shafts/sleeves, bushings, precision spacers, machined housings
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Automotive & equipment: structural members, precision parts requiring tight tolerances
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General fabrication: welded assemblies, supports, jigs/fixtures, machine bases
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.
Get in Touch
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