Q:How to choose the appropriate galvanized angle steel according to the corrosion level?
A:1. Indoor dry environment (such as warehouses, offices): Low corrosion risk, optional electro-galvanized angle steel (zinc layer thickness ≥ 12μm), low cost.
2. Outdoor humid/rainy environment (such as bridges, street light poles): Hot-dip galvanized angle steel (zinc layer thickness ≥ 85μm) is required, and atmospheric corrosion resistance is increased by 5-10 times.
3. High humidity + salt spray environment (coastal areas, ports): Hot-dip galvanizing is required, and the recommended zinc layer thickness is ≥ 100μm, or zinc-aluminum alloy coating is selected (stronger corrosion resistance).
4. Acid-base/chemical environment (chemical plants, sewage treatment plants): Ordinary galvanized angle steel is easily corroded and needs to be matched with epoxy zinc-rich primer + topcoat, or stainless steel angle steel is directly selected.
Q:How to choose angle steel type according to temperature and climate conditions?
A:High temperature environment (such as around industrial furnaces): The high temperature resistance of the base material needs to be confirmed (the temperature resistance of ordinary Q235B is ≤300℃, and Q345D or heat-resistant steel is used in high temperature scenes).
Cold areas: Consider the low temperature impact toughness of the material (such as Q355B is more resistant to low temperatures than Q235B).
Q:How to choose the type of galvanized angle steel according to the installation space and connection method?
A:1. Size limitation: If the installation location is narrow (such as the internal bracket of the equipment), you need to choose a small angle steel (such as ∠30×30×3), or customize the cutting.
When you need to reserve the bolt hole position, pay attention to the angle steel side width must be ≥ bolt diameter ×2 (such as M12 bolts, side width ≥25mm).
2. Connection method affects specifications: Welding connection: The zinc layer at the weld needs to be polished to avoid welding pores. Thick-walled angle steel (≥6mm) has higher welding strength.
Bolt connection: The side width must meet the bolt spacing requirements (such as double bolt connection, side width ≥70mm). Thin-walled angle steel (≤4mm) is easy to slip and needs to be selected with caution.
Q:How to choose the angle steel with the best cost-effective material and specifications?
A:Low-load scenarios (such as decorative parts): choose Q235B + electrogalvanizing to reduce costs.
Load-bearing structures (such as steel structure workshops): Q355B + hot-dip galvanizing is preferred. Although the unit price is high, the overall life cost is lower.
Avoid "over-design": For example, ∠50×50×4 is sufficient for ordinary guardrails, and there is no need to choose ∠63×63×6, which wastes materials.
Q:How to choose galvanized angle steel for building steel structure frame (outdoor, load-bearing)?
A:Environment: humid and rainy, need to resist wind load and snow load.
Selection: equilateral angle steel ∠100×100×8, Q355B material, hot-dip galvanized (zinc layer ≥85μm).
Reason: The side length of 100mm provides sufficient bending rigidity, the thickness of 8mm meets the load-bearing requirements, Q355B has high strength, and hot-dip galvanizing is suitable for outdoor corrosion.
