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I.Classification by Production Process (Two Main Categories)
I. Classification and Production Process
Channel steel is mainly divided into hot-rolled and cold-formed channel steel according to production processes, with obvious differences in performance and applications.
Hot-rolled Ordinary Channel Steel (over 90% market share)
Production: Carbon/low-alloy steel billets heated to 1100–1250°C, continuously rolled, cooled, straightened, cut and inspected.
Features: Stable dimensions, uniform web, high load capacity, good toughness, low cost.
Specifications: Web height 50mm (5#) – 400mm (40#), for heavy‑duty structures.
Cold-formed Light Channel Steel
Production: 2–8mm thin steel plates bent at room temperature, straightened, cut, surface-treated (galvanized/painted optional).
Features: High precision, smooth surface, thin wall, lightweight (15–30% lighter than same-spec hot-rolled), good appearance.
Applications: Light buildings, interior decoration, small equipment brackets and other light‑weight structures
2. Classification by Cold-formed Shape (Only for Cold-formed Light Channel Steel)
According to the slight differences in cross-sectional shape, cold-formed channel steel can be divided into four types, which are suitable for different installation and force-bearing scenarios. All are cold-formed at room temperature, maintaining the high precision and light weight characteristics of cold-formed steel:
Cold-formed Equal-sided Channel Steel: The widths of the legs on both sides are equal, the cross-section is symmetrical, the force is uniform, suitable for light-weight brackets and frame structures with symmetrical force;
Cold-formed Unequal-sided Channel Steel: The widths of the legs on both sides are unequal, which can adapt to loads in different directions according to force requirements, mostly used in asymmetric support scenarios;
Cold-formed Inner-curled Channel Steel: The ends of the legs on both sides of the channel steel are curled inward, which can enhance the torsion resistance and stiffness of the cross-section, suitable for light-weight structures with high stability requirements;
Cold-formed Outer-curled Channel Steel: The ends of the legs on both sides of the channel steel are curled outward, which can increase the bearing area of the cross-section and improve the surface aesthetics, mostly used in decorative structures and small bearing brackets.
II. Specifications and Models (Implementing National Standard GB/T 706-2016)
1. Specification Expression Method
The specification and model of channel steel are mainly expressed by its key cross-sectional dimensions. The national standard uniformly adopts the format of "web height (h) × leg width (b) × web thickness (d)" (unit: mm), and combines model codes and classification letters to distinguish detailed specifications:
Model Code: Named after the value of web height (h). For example, channel steel with a web height of 100mm has a model of 10#, that is, 10# channel steel = 100×48×5.3mm (web height 100mm, leg width 48mm, web thickness 5.3mm);
Classification Letters: For channel steel with the same web height, according to the differences in web thickness and leg thickness, it is divided into three models: a, b and c. Among them, model a has the thinnest web and leg thickness, model c has the thickest web and leg thickness, and model b is the intermediate specification. The bearing capacity increases in turn (model a < model b < model c), which can be selected according to actual load requirements.
2. Reference of Common Specifications (Including Theoretical Weight, Suitable for Most Engineering Scenarios)
Model |
Cross-sectional Dimension (h×b×d, mm) |
Theoretical Weight (kg/m) |
Application Scenarios |
10# |
100×48×5.3 |
10.0 |
Small brackets, light purlins, interior decoration skeletons |
16# |
160×88×6.0 |
17.2 |
Medium equipment bases, auxiliary factory brackets, cable trays |
20#a |
200×73×7.0 |
27.9 |
Factory frames, auxiliary beam-column components, vehicle carriage skeletons |
25#b |
250×78×7.0 |
31.1 |
Heavy-duty brackets, auxiliary bridge components, storage shelf columns |
32#c |
320×92×12.0 |
48.1 |
Heavy-duty factory beam-columns, large equipment frames, transmission towers |
40#a |
400×100×10.5 |
58.9 |
Large auxiliary bridge structures, heavy machinery bases, high-load brackets |
3. Length Specifications
The conventional length range of channel steel is 6-12m, which can be flexibly selected according to engineering construction needs. Among them, 6m, 9m and 12m are the most commonly used lengths, suitable for conventional transportation and installation scenarios; at the same time, customized length production is supported. The customized length can be adjusted according to customer needs (allowable deviation ±50mm) to meet the size requirements of special projects. The production cycle of customized length products needs to be confirmed with the manufacturer in advance. The delivery time of conventional specification products is 5-7 days, and the delivery time of customized length products needs to be negotiated separately according to the production cycle.
III. Material and Mechanical Properties
1. Common Materials (Two Main Types, Suitable for Most Engineering Scenarios)
The materials of channel steel are mainly carbon structural steel and low-alloy high-strength structural steel. The selection of materials directly determines the mechanical properties, processing performance and application environment of channel steel. Among them, Q235B is the most commonly used material, and Q355B is suitable for high-stress and high-demand scenarios.
Q235B (Carbon Structural Steel, Most Commonly Used)Material Characteristics: Carbon content ≤0.25%, belonging to low-carbon steel, with low impurity content and uniform material. It has excellent processing performance, welding performance and riveting performance, easy to cut, drill and bend, and can adapt to various engineering needs without special processing technology; low cost and high cost performance, it is the mainstream material in the current channel steel market, covering more than 80% of application scenarios. Mechanical Indicators: Yield strength ≥235MPa, tensile strength 370-500MPa, elongation ≥21%, good impact toughness (room temperature impact energy ≥34J), able to withstand a certain impact load and not easy to break. Application Scenarios: Conventional projects such as ordinary building structures, mechanical brackets, vehicle chassis, storage shelves, etc., not suitable for high-stress and high-corrosion requirement scenarios.
Q355B (Low-alloy High-strength Structural Steel, Formerly Q345B)Material Characteristics: On the basis of carbon structural steel, a small amount of alloying elements such as manganese and silicon are added, carbon content ≤0.24%, belonging to low-alloy steel. Its strength is significantly higher than Q235B, and it also has good welding performance and toughness. Its corrosion resistance is better than Q235B, and it can adapt to mild corrosive environments (such as ordinary outdoor scenarios). Mechanical Indicators: Yield strength ≥355MPa, tensile strength 470-630MPa, elongation ≥21%, excellent impact toughness (room temperature impact energy ≥34J), able to withstand higher loads and stresses, and strong deformation resistance. Application Scenarios: High-stress projects, large outdoor structures, bridge projects, heavy machinery frames, transmission towers and other scenarios with high requirements on strength and stability. It has higher cost performance than ordinary carbon steel and is the preferred material for high-end projects.
2. National Standard Mechanical Performance Requirements (Taking Mainstream Q235B and Q355B as Examples)
Material |
Yield Strength (≥MPa) |
Tensile Strength (MPa) |
Elongation (≥%) |
Room Temperature Impact Energy (≥J) |
Q235B |
235 |
370-500 |
21 |
34 |
Q355B |
355 |
470-630 |
21 |
34 |
Note: The above mechanical properties all meet the requirements of national standard GB/T 706-2016. In actual production, sampling inspection will be carried out according to production batches to ensure that product performance meets the standards.
IV. Dimensional Deviation (Implementing National Standard GB/T 706-2016 to Ensure Product Precision)
The dimensional deviation of channel steel directly affects its installation precision and force stability. The national standard has clear requirements for the key dimensional deviation of channel steel of different specifications, as follows (slightly different according to web height specifications, the following is the conventional range):
Web Height (h): Deviation range ±1.5mm - ±3.0mm. The smaller the web height, the smaller the deviation, ensuring regular cross-sectional dimensions;
Leg Width (b): Deviation range ±1.5mm - ±3.5mm. The deviation of the leg widths on both sides should be symmetrical to avoid uneven thickness on one side;
Web Thickness (d): Deviation range ±0.4mm - ±0.8mm. High requirements for uniformity of web thickness, which directly affects the bending resistance of channel steel;
Bending Deflection: ≤0.15d (d is web thickness), to avoid bending deformation of channel steel and ensure flat structure after installation;
Other Deviations: Cross-sectional perpendicularity ≤0.3mm/m, leg end perpendicularity ≤0.5mm, ensuring the installation adaptability of channel steel.
V. Main Applications (Covering Multiple Fields, Suitable for Different Scenarios)
With its excellent mechanical properties and convenient installation characteristics, channel steel is widely used in various fields such as construction, machinery, vehicles, bridges, warehousing, power, etc. Channel steel of different specifications and materials is suitable for different application scenarios, as follows:
Construction Structure Field (the most important application field) Used for frame structures, purlins, beam-columns, support brackets, platform pedals, stair handrails of factories, warehouses, office buildings and other buildings; small channel steel (5#-16#) is mostly used for purlins and brackets of light-weight buildings, and large channel steel (20# and above) is mostly used for beam-columns and high-load brackets of heavy-duty factories, which can effectively improve the stability and bearing capacity of building structures.
Mechanical Manufacturing FieldUsed for bases, frames, guide rails, brackets, guardrails of various mechanical equipment, such as machine tool bases, conveyor brackets, crane brackets, etc.; Q355B material channel steel is mostly used for heavy machinery, which can withstand vibration and load during equipment operation, and Q235B material channel steel is mostly used for light-weight mechanical equipment, balancing cost and performance.
Vehicle/Ship FieldUsed for carriage skeletons, chassis brackets, frame crossbeams of automobiles, trucks, engineering vehicles, as well as inner cabin structures, deck brackets of ships, etc.; channel steel is required to have good welding performance and impact resistance, which can adapt to vibration and impact during vehicle driving and ship navigation.
Bridge Engineering FieldUsed for auxiliary components, sidewalk brackets, guardrail brackets, pier supports of bridges, mostly selecting large Q355B material channel steel (25# and above), which is required to have high strength and toughness, able to withstand the self-weight and traffic load of bridges, and adapt to the erosion of outdoor environment.
Warehousing/Power FieldWarehousing Field: Used for columns, crossbeams, brackets of storage shelves. Small channel steel is used for light-weight shelves, and large channel steel is used for heavy-duty shelves, which can be selected according to the bearing requirements of shelves; Power Field: Used for cable trays, transmission towers, substation brackets, etc. Channel steel is required to have good stability and corrosion resistance (which can be improved by galvanizing treatment) to ensure the safe operation of power equipment.
VI. Surface and Quality Requirements (Meeting National Standards to Ensure Product Quality)
1. Surface Quality Requirements
The surface is clean, free of serious defects such as cracks, scars, folds, layers, bubbles, etc. Such defects will affect the mechanical properties of channel steel and lead to fracture risk during use;
Local slight scratches and indentations are allowed, with scratch depth ≤0.3mm, which does not affect cross-sectional dimensions and mechanical properties, and no additional treatment is needed;
The surface color is uniform, without obvious color difference. The surface of hot-rolled channel steel may have slight oxide scale (which is a normal production trace), and the surface of cold-formed channel steel has no oxide scale, smooth and flat;
No significant torsion, and the cross-sectional perpendicularity meets the national standard requirements, ensuring accurate docking during installation and avoiding installation deviation.
2. Internal Quality Requirements
Uniform material, free of internal defects such as inclusions and pores, and chemical composition meets the national standard requirements of the corresponding material (such as Q235B carbon content ≤0.25%);
Mechanical properties meet the standards. Each batch of products is sampled and tested for yield strength, tensile strength, elongation and other indicators to ensure compliance with national standard requirements;
Dimensional accuracy meets the deviation requirements, and the deviation of key cross-sectional dimensions (web height, leg width, web thickness) is controlled within the national standard range to ensure product consistency and adaptability.
VII. Implementation Standards (Mainly National Standards, Considering International Standards)
The production and inspection of channel steel strictly follow relevant standards to ensure that product quality meets market needs and engineering requirements. The main implementation standards are as follows:
Hot-rolled Channel Steel: GB/T 706-2016 "Hot-rolled Section Steel", which is the core national standard, specifying the dimensions, shape, weight, technical requirements, test methods, inspection rules, etc. of hot-rolled channel steel, and is the main basis for domestic production and inspection;
Cold-formed Channel Steel: GB/T 6725-2017 "Cold-formed Section Steel", which specifies the production process, dimensional deviation, surface quality, mechanical properties and other requirements of cold-formed channel steel, applicable to cold-formed light channel steel;
International Standards: ASTM A36 (American Standard), JIS G3192 (Japanese Standard), EN 10034 (European Standard), applicable to export products. Their dimensional and mechanical performance requirements are slightly different from national standards, and production can be adjusted according to export needs.
VIII. Summary of Product Characteristics
Reasonable Cross-section and Excellent Mechanical Properties: Grooved cross-section design, high bending resistance, good torsion resistance and strong stability, able to effectively bear longitudinal and transverse loads, suitable for various force-bearing scenarios;
Stable Material and Wide Adaptability: Mainstream Q235B and Q355B materials cover conventional and high-end engineering needs, with uniform material and good processing performance, which can meet the use requirements of different scenarios;
Easy to Process and Convenient to Install: Can be directly cut, welded, drilled, bent and other processing without special technology. During installation, it can be quickly docked by welding, riveting and other methods to improve construction efficiency;
High Cost Performance and Wide Application: Hot-rolled channel steel has low cost and stable performance, and cold-formed channel steel is lightweight and high-precision. It can be selected according to engineering needs, covering multiple fields of application, and is the preferred steel for engineering construction;
Controllable Quality and Compliance with National Standards: Production and inspection strictly follow national standard requirements, and dimensional accuracy, mechanical properties and surface quality are guaranteed, which can be safely used in various projects.
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