Hot-Dip Galvanized Steel Angle is made from hot-rolled carbon structural angle steel and coated with zinc after section forming and required fabrication. It is available in equal and unequal angles, with Q235B and Q355B steel grades.
Equal angle has two legs of the same width. Unequal angle has different leg widths for applications where the connection or load arrangement requires different bearing dimensions.
| Product | Hot-Dip Galvanized Steel Angle |
| Base Material | Q235B, Q355B |
| Profile | Equal angle / Unequal angle |
| Common Size | 20 × 20 mm–200 × 200 mm |
| Thickness | 2.0–20 mm |
| Standard Length | 6 m / 9 m / 12 m |
| Custom Length | Fixed-length cutting available |
| Zinc Coating | Commonly 60–120 μm |
| Higher Coating | 150–200 μm |
| Surface | Hot-dip galvanized, silver-gray |
| Processing | Cutting, punching, drilling, bending, beveling, grinding and other agreed fabrication |
| Structural Steel Reference | GB/T 706 |
| Galvanizing Reference | GB/T 13912-2020 |
| Tensile Strength | Approximately 375–500 MPa, subject to grade and specification |
ASTM, EN or other destination-market standards can be specified when required by the project.
Q235B is commonly used for support frames, guardrails, equipment supports, warehouse structures and general steel fabrication.
Q355B provides higher material strength for applications with higher loads, larger spans or more demanding structural requirements.
The steel grade should be selected together with the angle size, thickness, span, load and connection design.
The angle steel is processed and surface-prepared before immersion in molten zinc at approximately 450–460°C.
Production sequence:
Hot-rolled angle steel → incoming inspection → straightening → cutting / fabrication → degreasing → pickling → rinsing → fluxing → drying → hot-dip galvanizing → cooling → passivation → final straightening and sizing → zinc coating inspection → final inspection → packing.
Pickling removes rust and mill scale so that the zinc coating can form properly on the steel surface.
| Environment | Coating Direction |
| Normal outdoor exposure | 60–120 μm |
| Humid outdoor environment | Increased coating may be specified |
| Coastal salt exposure | 150–200 μm may be specified |
| Chemical or severe corrosion | Project-specific coating requirement |
The coating requirement should be stated in the purchase order instead of specifying only “hot-dip galvanized.” For example: Q355B / 100 × 100 × 8 mm / 12 m / hot-dip galvanized / 150–200 μm.
| Application | Typical Use |
| Photovoltaic systems | Support components, braces, fixing frames and auxiliary structures |
| Municipal infrastructure | Guardrails, fence supports and outdoor steel structures |
| Curtain walls | Brackets, support members and connection components |
| Warehouses | Rack frames, equipment bases and structural reinforcement |
| Industrial plants | Pipe supports, equipment brackets and outdoor support structures |
| Agriculture | Greenhouse frames, fence supports and equipment structures |
Fixed-length cutting, punching, drilling, bending, beveling and grinding can be arranged according to drawings.
For fabricated components, major cutting and hole processing can be completed before galvanizing so the finished part receives zinc protection after processing.
If cutting, drilling or welding is performed after galvanizing, the exposed steel or heat-affected area should be cleaned and repaired with a suitable zinc-rich coating.
Inspection covers both the base steel and the galvanized coating.
Material certificates and galvanizing inspection records can be supplied for project orders. Third-party inspection can also be arranged when required.
Black angle steel has no zinc coating and normally requires painting or another corrosion-protection system for outdoor use.
Hot-dip galvanized angle steel is coated at the factory before shipment, which removes the need for a separate full-surface painting process at the installation site.
For dry indoor applications, black angle steel may be sufficient where permitted by the project specification. For outdoor or moisture-exposed structures, the corrosion-protection requirement should be specified with the steel grade and section.
Angle steel provides two perpendicular legs and is commonly used for braces, brackets, frames and connection members.
Flat bar provides a single flat surface and is used for straps, plates, reinforcement and other flat connection components.
Channel steel has a deeper open section and is generally used where greater section depth is required for structural support.
The choice depends on the load, connection method, available space and required section properties.
40 × 40 mm and 50 × 50 mm galvanized angle steel was supplied for residential and commercial rooftop PV support applications. The material was specified with increased zinc protection for outdoor exposure.
Standard 6 m galvanized angle steel was supplied for guardrail and enclosure support work. The material was delivered to the required length and checked for section dimensions before installation.
200 μm zinc-coated galvanized angle steel was supplied for outdoor equipment support structures in a coastal industrial environment with salt-laden air and light chemical exposure.
Hot-Dip Galvanized Steel Angle can be supplied in 6 m, 9 m and 12 m standard lengths or cut to project dimensions. Equal and unequal angles, specified zinc coatings and fabricated components can be arranged according to drawings.
For export shipments, steel angles are bundled and reinforced for ocean transportation. Moisture-resistant packing can be used to reduce handling damage and white-rust risk during transportation and storage.
A purchase specification should include:
Steel grade + angle type + leg dimensions + thickness + length + zinc coating + fabrication requirements.
Example:
Q235B / Equal Angle / 50 × 50 × 5 mm / 6 m / Hot-Dip Galvanized / specified zinc coating / pre-punched according to drawing.
For project orders, drawings can be provided for fixed-length cutting, hole positions and other fabrication requirements.
Rongheng supplies steel products from Tianjin Daqiuzhuang, with access to hot-rolled steel, galvanizing and downstream steel-processing resources.
Standard angle steel and project orders can be coordinated with cutting, fabrication, galvanizing, inspection and export packing according to the required specification.
Yes. Both equal and unequal angle sections can be supplied according to size and project requirements.
Common sizes range from approximately 20 × 20 mm to 200 × 200 mm, with thicknesses of 2–20 mm. Other sizes can be discussed according to the required specification.
Standard lengths are 6 m, 9 m and 12 m. Fixed-length cutting is available.
The common zinc coating range is 60–120 μm. Higher coating requirements of 150–200 μm can be specified for demanding outdoor environments.
Yes. Coastal projects should specify the zinc coating according to the salt exposure. A higher coating such as 150–200 μm can be considered for stronger exposure.
Yes. Fixed-length cutting, punching, drilling and other fabrication can be completed before galvanizing according to drawings.
Welding removes the zinc coating around the heated area. After welding, the affected area should be cleaned and repaired with a suitable zinc-rich coating.
Yes. It can be used for selected PV supports, braces, fixing frames and auxiliary structures. The section and zinc coating should match the project design and exposure conditions.
Q235B is commonly used for conventional structural and support applications. Q355B is used where higher material strength is required. The final selection should follow the structural design.
Material certificates and galvanizing inspection records can be supplied according to the order. Third-party inspection can also be arranged when required.
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Secondary Arterial Road No. 2-1, Expansion Area of Daqiuzhuang Industrial Zone, Jinghai District, Tianjin, China
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