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:

• Hot-finished structural hollow sections: produced by hot forming/hot finishing to deliver stable geometry, strong load capacity, and reliable toughness for structures.

• 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):

• Outside Diameter (OD): small OD to large OD (project-based)

• Wall Thickness (WT): light wall to thick wall (strength-driven)

• Length: fixed length or random length, cut-to-length available

• Shape: round / square / rectangular (structural hollow sections), round (precision tubes)

• Manufacturing route: hot finished (structural) / cold drawn (precision)

• Delivery condition: as-hot-finished, normalized (+N), stress relieved (+SR), annealed (+A), etc. (per selected standard/grade)

Key Features

• Seamless integrity: no weld seam, reducing weld-related risk points under load and during forming/machining.

• Structural reliability: hot-finished hollow sections provide predictable strength and toughness for fabricated structures. (Source: botopsteelpipes.com)

• 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)

• Good processability: suitable for cutting, drilling, bending, welding (grade-dependent), and machining.

Our Advantages

1. 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)

2. 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)

3. 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

Mechanical Properties 

Applicable Standards 

Selection depends on your project region and inspection requirements:

• EN: EN 10210-1 (hot finished structural hollow sections); EN 10305-1 (seamless cold drawn precision tubes)

• ASTM: ASTM A519 (seamless mechanical tubing) (Source: seamless-pipes.com)

• JIS: JIS G3445 (carbon steel tubes for machine structure) (Source: h2abc.com)

• GOST: GOST 8732 / GOST 8731 (seamless hot-worked pipes commonly specified in CIS markets) (Source: tubingchina.com)

• 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):

• Structural engineering: columns, trusses, frames, bracing members, handrails, platforms, lifting frames

• Machinery manufacturing: shafts/sleeves, bushings, precision spacers, machined housings

• Automotive & equipment: structural members, precision parts requiring tight tolerances

• General fabrication: welded assemblies, supports, jigs/fixtures, machine bases