Channel steel is a kind of long structural steel with a concave cross-section, a classic hot-rolled section steel widely applied in engineering construction and mechanical manufacturing. It is mainly made of high-quality carbon structural steel and low-alloy high-strength structural steel, processed by hot rolling as the core process, with the characteristics of reasonable section stress distribution, excellent load-bearing capacity and good processability. It is divided into hot-rolled channel steel and cold-formed channel steel according to the manufacturing process, and can be customized with different specifications to meet the diverse needs of various industrial scenarios.
الخصائص الرئيسية
- Excellent Structural Load-bearing Capacity: The concave cross-section design enables uniform stress on the web and flange, with strong bending and pressure resistance, suitable for bearing structural components.
- Superior Processability: Easy to perform welding, cutting, drilling, bending and other processing operations, and the processed joints have high stability and firmness.
- Good Mechanical Properties: Maintains high tensile and yield strength at room temperature, with moderate toughness and ductility, and no obvious deformation under normal load.
- High Dimensional Accuracy: The hot-rolled/cold-formed precision process ensures the consistency of section size, small tolerance and good straightness of the finished product.
- Cost-effectiveness: Adopts common carbon steel/low-alloy steel as raw material, with low production cost and high performance, suitable for large-scale engineering application.
- Customizable Performance: Can be processed by galvanizing, painting, shot blasting and other surface treatments to improve corrosion resistance and adapt to different working environments.
الإنتاج وأنواعه
- Manufacturing Processes: Hot rolling (the main process for standard channel steel) for hot-rolled channel steel; roll forming + high-frequency welding for cold-formed channel steel.
- Product Forms: Hot-rolled channel steel (ordinary and light series), cold-formed channel steel; available with fixed length, random length and customized cutting according to customer requirements.
- Surface Treatments: Natural hot-rolled surface, hot-dip galvanizing, electro-galvanizing, epoxy painting, shot blasting and derusting (Ra ≤ 3μm for general structural use).
التركيب الكيميائي
| العنصر | المحتوى (جزء الكتلة) |
| الكربون (C) | ≤ 0.29% |
| السيليكون (Si) | 0.17% – 0.50% |
| المنجنيز (Mn) | 0.50% – 1.60% |
| الفوسفور (P) | ≤ 0.045% |
| الكبريت (S) | ≤ 0.045% |
| Copper (Cu) | ≤ 0.30% (Optional, for weathering type) |
| الحديد (Fe) | الرصيد |
مواصفات الأبعاد والتفاوتات المسموح بها
| المعلمة | Hot-rolled Channel Steel | Cold-formed Channel Steel | التسامح |
| Section Height (h) | 50-400mm (Customizable) | 20-300mm (Customizable) | ±1.0% of nominal height |
| Flange Width (b) | 37-140mm (Matching height) | 20-150mm (Matching height) | ±1.5% of nominal width |
| Web Thickness (d) | 4.5-16mm (Matching height) | 1.5-10mm (Matching height) | ±10% من السُمك الاسمي |
| الطول | 6m/9m/12m (fixed length) | 3m-12m (fixed length) | Customizable, total bending degree ≤0.30% of total length |
| الاستقامة | – | – | ≤3mm per meter length |
الخواص الميكانيكية
| الممتلكات | القيمة النموذجية |
| قوة الخضوع (ReL/Rp0.2) | ≥ 235MPa – 355MPa (Depends on material grade) |
| قوة الشد (Rm) | 375MPa – 550MPa (Depends on material grade) |
| Elongation After Fracture (A50mm) | ≥ 20% – 26% (Depends on material grade) |
| أداء الانحناء | 180° bend test, no cracks or deformation |
| Impact Toughness (Akv, 20℃) | ≥ 30J (Depends on material grade) |
| Weldability | Excellent, suitable for various welding processes |
المعايير المطبقة
- Hot-rolled Channel Steel: Chinese GB/T 706-2016, Japanese JIS G3192, American ASTM A36/ASTM A572, European EN 10034
- Cold-formed Channel Steel: Chinese GB/T 6725, Japanese JIS G3350, American ASTM A1003, European EN 10219
