Galvanized I-beam
Product Introduction
Galvanized Channel Steel Parameter Table
| Element | Function | Content Range (wt%) | Notes |
|---|---|---|---|
| Iron (Fe) | Primary component of the substrate; determines basic strength | ≥98.5 | Balance (main component after other elements are accounted for) |
| Carbon (C) | Improves strength but reduces ductility | ≤0.22 (Q235/S235JR); ≤0.20 (Q355/S355JR) | Excess C increases brittleness and impairs zinc coating adhesion |
| Manganese (Mn) | Refines grain structure; enhances strength and toughness | 0.30–1.40 (Q235/S235JR); 0.50–1.60 (Q355/S355JR) | Partially replaces C to reduce brittleness risk |
| Silicon (Si) | Deoxidizer in steelmaking; slightly improves strength | ≤0.35 (Q235/S235JR); ≤0.55 (Q355/S355JR) | Excess Si reduces weldability and degrades coating quality |
| Sulfur (S) | Harmful element; causes “hot brittleness” (cracking during heating/processing) | ≤0.045 (Q235/S235JR); ≤0.040 (Q355/S355JR) | Strictly limited to prevent cracking during forming or loading |
| Phosphorus (P) | Harmful element; causes “cold brittleness” (cracking at low temperatures) | ≤0.045 (Q235/S235JR); ≤0.040 (Q355/S355JR) | Controlled to avoid brittle fracture in low-temperature environments |
| Copper (Cu) | (Optional) Enhances atmospheric corrosion resistance | ≤0.30 (for weather-resistant substrates only) | Non-essential; added only for specific outdoor corrosion requirements |
| Property Category | Key Parameter | Definition | Significance for Galvanized Profiles |
|---|---|---|---|
| Tensile Properties | Yield Strength (Rₑₕ) | The stress at which the material begins to deform permanently (plastic deformation) | Ensures the profile does not deform under design loads (e.g., structural supports, framing). |
| Tensile Strength (Rₘ) | The maximum stress the material can withstand before breaking | Determines the profile’s load-bearing limit to prevent structural failure. | |
| Elongation After Fracture (A) | The percentage of length increase before the material breaks | Indicates ductility—critical for forming (e.g., bending, rolling) and absorbing impact energy. | |
| Bending Properties | Bending Strength/Formability | Ability to withstand bending without cracking or permanent damage | Essential for profiles used in construction (e.g., C-channels, U-sections) that require on-site bending. |
| Impact Properties | Charpy Impact Energy (Kv) | Energy absorbed by the material during sudden impact (at specific temperatures) | Ensures performance in low-temperature environments (e.g., cold regions) to avoid brittle fracture. |
| Hardness | Brinell Hardness (HB) / Vickers Hardness (HV) | Resistance to surface indentation | Relevant for profiles exposed to wear (e.g., industrial rails) but less critical for general construction. |
Packaging and transportation
8unit in 1*20GP container , 12units in 1*40HQ container, Fumigated wood tray and 10mm wire fixed.
