Q:What are the main parameters and specifications of galvanized angle steel?
A:Side length (L)
Equal angle steel: the lengths of both sides are equal, expressed as "∠ side width × side width × thickness".
Unequal angle steel: the lengths of both sides are unequal, expressed as "∠ long side width × short side width × thickness"
Thickness (d)
Angles of the same side length may have different thicknesses. The thicker the angle, the greater the load-bearing capacity, but also the higher the weight and cost.
Length (L)
The standard length is 6m, 9m, 12m, etc., and can be customized according to needs.
Galvanizing layer thickness
The thickness of the hot-dip galvanized layer is usually ≥85μm (micrometers), and the thickness of the electroplated galvanized layer is ≥12μm. The thicker the zinc layer, the better the anti-corrosion performance.
Material
The base material is usually made of carbon structural steel such as Q235B and Q355B, and the strength grade affects the load-bearing capacity.
Stainless steel base materials (such as 304 and 316) are used in some scenarios, but the cost is relatively high.
Q:What are the performance characteristics of galvanized angle steel?
A:Strength and rigidity: Same as base material (ordinary angle steel), thickness determines load-bearing capacity.
Corrosion resistance: The zinc layer forms an oxide film to prevent the substrate from rusting, and is suitable for humid, coastal and chemical environments.
Appearance and maintenance: The surface is silvery white and bright, and does not require frequent maintenance; even if the zinc layer is damaged after long-term use, it can still protect the substrate through electrochemical protection.
Welding performance: The galvanized layer may produce zinc vapor during welding (needs to be polished). It is recommended to use a suitable welding process (such as gas shielded welding).
Q:What are the advantages of galvanized angle steel compared with ordinary angle steel?
A:1. Ordinary angle steel is easy to rust and requires additional anti-corrosion treatment (such as painting).
2. The strength is the same under the same specifications, but the galvanized layer adds a small amount of weight.
3. Ordinary angle steel needs to be regularly painted to prevent rust, and the maintenance cost is high.
4. Ordinary angle steel is more convenient to weld and does not require special treatment.
Q:What are the applicable scenarios for galvanized angle steel?
A:1. Construction Engineering
Steel structure frames, roof supports, curtain wall keels, scaffolding, etc. are especially suitable for humid areas or open-air buildings.
2. Power and Communications
Transmission towers, cable bridges, and communication base station brackets need to withstand long-term corrosion in outdoor environments.
3. Municipal and Transportation
Bridge crash barriers, road guardrails, street light pole brackets, and subway tunnel supports require high durability. 4. Machinery and Equipment
Industrial equipment frames, agricultural machinery frames, and storage racks (such as warehouse angle steel racks) require corrosion resistance and load-bearing.
5. Marine Engineering and Chemical Industry
Coastal buildings, port facilities, and chemical plant brackets should choose hot-dip galvanized or high zinc layer thickness products.
Q:What are the selection and precautions for galvanized angle steel?
A:1. Select the zinc layer thickness according to the environment
Indoor dry environment: electroplating zinc can be selected (low cost).
Outdoor, humid or acid-base environment: hot-dip galvanizing is required, and the zinc layer thickness is ≥85μm.
2. Check the size and tolerance
The side length and thickness tolerance must comply with national standards (such as GB/T 9787-1988) to avoid affecting the installation due to dimensional deviation.
3. Pay attention to the strength of the substrate
Q355B material is preferred for load-bearing structures, and Q235B can be used in ordinary scenes.
4. Welding and installation
Before welding, the zinc layer near the weld needs to be removed, and zinc-rich paint should be applied to the damaged area after welding to avoid corrosion.