Hot Rolled Structural Steel Channel Sections

Hot Rolled Structural Steel Channel Sections comply with the national standard GB/T 706-2016 and are produced using an integrated hot-rolling process. They feature a C-shaped (single-sided opening) cross-section. Models are classified by section height, with further subdivisions (a, b, c) indicating increased thickness for the same height. The products are lightweight, easy to process, and cost-effective. While individual sections have limited lateral stiffness and torsional resistance—making them suitable primarily for secondary load-bearing components—combining two sections (back-to-back) with connecting plates significantly enhances overall mechanical performance.

HAISHENG offers a full range of mainstream hot-rolled channel section models, each accompanied by a comprehensive material test report. They are suitable for various auxiliary load-bearing applications, including industrial plants, municipal projects, MEP/HVAC systems, and temporary structures. We provide a complete range of anti-corrosion treatments—including rust removal, painting, and hot-dip galvanizing—to meet the bulk procurement needs of overseas projects.

I. Product Standards

Production, dimensional tolerances, and mechanical properties of the Hot Rolled Structural Steel Channel Sections comply with the national standard: GB/T 706-2016 "Hot-rolled structural steel sections."

Mechanical standards for base steel materials: GB/T 700 and GB/T 1591.

II. Key Product Features

2.1 Cross-section and Mechanical Properties

1. Features a single-sided open channel cross-section; individual members exhibit moderate lateral stiffness and relatively weak torsional resistance, making them unsuitable for use as standalone main columns in high-rise buildings or primary load-bearing beams for long spans.

2. Manufactured via an integrated hot-rolling process with no welded joints, resulting in low internal residual stress. The structure is stable and reliable, resisting cracking and deformation under long-term loading.

2.2 Procurement and Cost Advantages

1. Ample stock of standard market models and stable procurement channels ensure low unit prices and controllable overall project costs.

2. Lighter self-weight for the same load-bearing capacity effectively reduces the total weight of the steel structure as well as transportation and hoisting costs.

2.3 On-site Fabrication and Construction Advantages

1. Hot-rolled structural steel channel sections can be freely cut, drilled, welded, and bent; there are no process limitations for on-site secondary fabrication, allowing for flexible joint assembly.

2. Compact size and low self-weight allow handling and hoisting to be completed using manual labor and small-scale equipment, significantly shortening the on-site construction schedule.

3. Compatible with both bolted and welded connections; can be paired with various steel plates and sections to complete joint assembly.

2.4 Corrosion Protection and Environmental Adaptability

1. Supplied in a hot-rolled "black" state (with mill scale) and without a pre-applied anti-corrosion coating.

2. Anti-corrosion treatments—such as grinding/rust removal, anti-rust primer application, hot-dip galvanizing, or powder coating—can be applied as needed; suitable for use in dry indoor environments or outdoor environments with mild corrosivity.

2.5 Advantages of Combined Use and Limitations

1. Advantages of combined use: Joining two channel sections back-to-back with connecting plates significantly enhances lateral stiffness and torsional resistance, meeting moderate load-bearing requirements.

2. Limitations: Due to the open-section structure, they cannot be used for high-rise building main frames, ultra-long-span heavy-load main girders, or critical load-bearing joints subject to high wind pressure; they are suitable only for enclosure systems, bracing, and secondary load-bearing components.

III. Key Application Scenarios

3.1 Core Uses of Hot Rolled Structural Steel Channel Sections

1. Factory wall and roof purlins: Paired with H-beam main girders to secure profiled steel cladding panels and transfer vertical loads from the roof and walls.

2. Supports for various equipment and piping: Used for pipe racks and hangers (including HVAC systems in buildings), equipment bases, and cable tray supports in chemical plants and power stations. 3. Lightweight framing components: Partition wall studs, door and window frames, site hoarding frameworks, and secondary load-bearing members.

4. Industrial platform and walkway accessories: Maintenance walkway beams, platform step supports, and guardrail posts/handrail bases.

5. Reinforcement and embedded components: Embedded steel plates, beam and column stiffeners, and auxiliary steel for foundation support.

6. Temporary construction facilities: Prefabricated building frameworks, scaffolding bases, and temporary excavation safety supports.

3.2 Industry-wide Applications

1. Industrial buildings: Enclosure and support systems for light industrial plants, warehouses, workshops, and raw material storage facilities.

2. Municipal infrastructure: Roadside safety barriers, outdoor billboard frameworks, small pedestrian walkways, and municipal utility line supports.

3. M&E and HVAC engineering: Ductwork and specialized equipment supports/hangers for chemical plants, power stations, and office buildings.

4. Simple civil structures: Carports, canopies, prefabricated cabins, and simple rural storage sheds.

5. Logistics and warehousing: Lightweight storage racking and cargo sorting platform frameworks.

6. Other accessories: Bases for construction machinery, agricultural machinery chassis, and small auxiliary steel structures for marine vessels.

V. Core Advantages of HAISHENG Factory Supply

Direct supply from the source manufacturer: In-house warehousing for Hot Rolled Structural Steel Channel Sections eliminates middleman markups, offering significant cost advantages for large-scale overseas project procurement.

Stable stock across all specifications: Ample year-round inventory of mainstream channel steel sizes (No. 5 to 25a); supports batch shipments and rapid response to urgent project orders.

Comprehensive quality inspection and traceability: Every batch of hot-rolled structural steel channel sections comes with original mill certificates and mechanical property test reports; supports third-party re-inspection to meet overseas project acceptance standards.

One-stop processing services: Supports fixed-length cutting, punching, bending, welded prefabrication, and custom hot-dip galvanizing; also offers bundled export of H-beams, I-beams, embedded plates, and high-strength bolts. Standardized export packaging: moisture-proof and rust-resistant wooden pallets or film wrapping; includes certificates of conformity and material certifications in both Chinese and English to ensure smooth customs clearance and on-site acceptance.

IV. Key Product Performance Parameters

4.1 Base Material Mechanical Properties

Supplementary mechanical indicators:

V-notch impact energy at normal temperature: Q235B ≥27J; Q355B ≥34J

Modulus of elasticity E ≈ 2.06×10⁵ MPa

4.2 Marking Rule & Standard Sizes

Marking specification Symbol: [ Format: Height × Flange Width × Web Thickness, e.g. [10# = 100×48×5.3mm Models with identical height are divided into a/b/c grades, with wider flanges and thicker webs for higher bearing capacity.

4.3 Section Mechanical Characteristics (Typical Sizes)

[10# Moment of inertia Ix ≈ 198 cm⁴ Section modulus Wx ≈ 39.7 cm³ Radius of gyration ix ≈ 3.95 cm

[20a# Moment of inertia Ix ≈ 1780 cm⁴ Section modulus Wx ≈ 178 cm³ Radius of gyration ix ≈ 7.86 cm Characteristic: Good bending resistance along strong X-axis, weak lateral stiffness & torsion resistance on weak Y-axis, not suitable for individual beam-column under bending & compression load.

4.4 Dimension & Shape Tolerance

Standard fixed lengths: 6m, 9m, 12m, custom cutting available

Height h tolerance: ±1.5~3.0mm (varies by model size)

Flange width b tolerance: ±1.5~2.0mm

Straightness: ≤2mm per meter, total straightness ≤0.2% of total length

Torsion: ≤1.5mm per meter

4.5 Machining & Surface Performance

Delivery condition: Hot rolled black surface with oxide scale

Machinability: Easy cutting, drilling, welding and bending for on-site fabrication

Anti-corrosion options: Derusting + primer painting, hot-dip galvanizing, plastic spraying

4.6 Service Temperature & Load Limits

Applicable temperature range: -20℃ ~ 80℃

Load characteristic: Open cross-section with low lateral stiffness and poor torsion resistance; suitable for simply supported uniaxial bending members, forbidden for high-rise main frames, long-span main beams and key wind-load bearing components

Connection method: Bolted or welded; double channel back-to-back assembly greatly improves overall rigidity

V. FAQ:

Q:Can channel steel be used alone as a load-bearing vertical column for high-rise frames?

A: Not recommended. Hot Rolled Structural Steel Channel Sections have an open cross-section on one side, resulting in poor lateral stiffness and torsional resistance; using them alone makes them prone to instability and deformation. HW wide-flange H-beams are the preferred choice for primary columns in high-rise structures.

Q: What is the best anti-corrosion treatment for channel steel in outdoor coastal projects?

A: Hot-dip galvanizing of the entire unit is recommended for long-term outdoor exposure or coastal environments with salt spray; for short-term indoor use in humid conditions, rust removal followed by two coats of anti-rust primer is sufficient.

Q: How do I choose between 'a', 'b', and 'c' type channel steels of the same height?

A: Type 'a' has the thinnest web and flanges, offering the lowest load-bearing capacity, while type 'c' has the greatest thickness. For heavy-load or long-span applications, the thicker 'b' or 'c' subtypes are preferred.

Q: What solutions exist if the stiffness of a single channel steel beam is insufficient?

A: Two channel steel beams can be joined back-to-back with connecting plates inserted between them to form a composite box-shaped section; this significantly enhances lateral stiffness and torsional resistance.

Q: Can channel steel be cut to specific lengths as required?

A: Yes. Standard stock lengths (6m, 9m, or 12m) can be cut to any length based on your drawings, and the cut ends can be ground smooth if required.

Theoretical weight of channel steel

Unit:kg/m、mm