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Help CenterSteel Angle & Heavy Thick Angle Steel，Q195、Q235B、SS400、A36、S235JR/Q355B、S355JR、A572 Gr50
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1. Product Overview
Angle Steel, commonly called angle iron, is L-shaped long section steel, divided into four categories: equal angle steel, unequal angle steel, hot rolled black angle steel and hot-dip galvanized angle steel. It is integrally formed by hot rolling with standard inner arc transition, featuring strong structural rigidity. Hot-dip galvanized angle steel is fully hot-dip coated for long-term rust prevention in outdoor, humid and salt spray environments. It can be cut, drilled, welded, bolted and bent, and assembled into various load-bearing supports, frames and connecting parts. It is a universal basic section steel widely used in steel structure workshops, power transmission towers, photovoltaic supports, bridges, storage racks and municipal engineering.
2. Core Product Advantages
Rigid L-shaped Cross Section with Stable Load BearingIntegrated double right-angle sides deliver excellent compression, bending and torsion resistance. Symmetrical equal angle steel bears uniform force, while unequal angle steel fits eccentric load structures to reduce auxiliary supports.
Superior Machinability & Fast On-site ConstructionLow carbon equivalent for carbon & HSLA grades enables crack-free welding; suitable for 180° cold bending, flame/plasma cutting, CNC punching, threading and bolt splicing to improve assembly efficiency.
Complete Anti-corrosion Solutions for All Working ConditionsEconomical black hot rolled finish, shot blasted anti-rust primer and heavy hot-dip galvanized coating options match indoor dry workshops, outdoor photovoltaic projects, coastal high salt spray and mild chemical corrosive sites.
Full Strength Grades for Light & Heavy LoadsCarbon steel for light supports and indoor structures; HSLA high strength grade for large towers, bridges and heavy equipment, cutting steel consumption and overall project cost.
Full Specification Range & Custom LengthComplete series of leg width and thickness; standard lengths 6m/9m/12m, customizable from 0.5m to 12m to minimize customer cutting waste.
Standard Inspection & Complete Export DocumentsEN10204 3.1 material certificate supplied per batch, including mechanical, chemical composition and galvanizing test reports, complying with acceptance standards of global engineering, power and infrastructure projects.
3. Main Executive Standards (Domestic & International Export Standards)
Domestic Standards
GB/T 706-2016 Hot rolled section steel (dimension tolerance for equal & unequal angle steel)
GB/T 700 Carbon structural steel
GB/T 1591 High strength low alloy structural steel
GB/T 13912 Technical specification for hot-dip galvanized coating
GB/T 2101 General rules for acceptance, packaging and marking of section steel
International Export Standards
EN 10056-1 Hot rolled angle steel dimensions & tolerances S235JR, S355JR
ASTM A36 / A572 Gr50 Carbon & HSLA high strength angle steel
JIS G3192 Hot rolled angle steel SS400
ISO 657-1 International standard for hot rolled angle steel
4. Product Classification & Application
Hot Rolled Black Equal Angle Steel (Main General Grade)Equal leg width with cost advantage; workshop frames, storage racks, small supports, equipment bases, pipe hangers.
Hot Rolled Black Unequal Angle Steel (Eccentric Load Special Grade)Different long & short leg sizes for asymmetric force; bridge stiffeners, equipment eccentric supports, curtain wall primary & secondary keels.
Hot-dip Galvanized Equal Angle Steel (Outdoor Anti-corrosion, Power Grounding)Heavy zinc coating 60–280g/㎡ with superior salt spray resistance; photovoltaic supports, transmission towers, grounding brackets, municipal guardrails, dock components.
Hot-dip Galvanized Unequal Angle Steel (Heavy-duty Outdoor Engineering)High strength eccentric load + long-term anti-corrosion; large wind power supports, offshore supporting steel structures, open-air storage load-bearing frames.
5. Common Material Grades
Carbon Angle Steel (Light Indoor, Ordinary Supports)
Q195, Q235B, SS400, A36, S235JR
HSLA High Strength Angle Steel (Heavy Load, Large Outdoor Infrastructure, Towers)
Q355B, S355JR, A572 Gr50
6. Specification Range
1. Equal Angle Steel
Leg Width: 20mm–200mm (Size 2#–20#)
Leg Thickness: 3mm–24mm
Mark Example: ∠50×50×5
Theoretical Weight Formula: kg/m = 0.00785 × Thickness × (2×Width − Thickness)
2. Unequal Angle Steel
Long Leg × Short Leg: 32×20mm–200×125mm
Leg Thickness: 3mm–18mm
Mark Example: ∠63×40×5
3. General Parameters
Standard Length: 6m, 9m, 12m; custom length 0.5–12m available
Surface Delivery Condition: Hot rolled black finish, shot blasted primed, hot-dip galvanized
Dimensional Tolerance: Leg width ±1~1.5mm, leg thickness ±0.3~0.5mm, straightness ≤0.4% of total length
7. Complete Production Process
Main Hot Rolled Angle Steel Flow
Slab reheating furnace heating → High-pressure water descaling → Universal mill L-section rolling → Hot straightening & cooling → Fixed-length shearing → Surface defect cleaning → Marking heat number & size → Multi-strap bundling & warehousing
Hot-dip Galvanizing Deep Processing Flow
Finished angle steel → Shot blasting rust removal → High-temperature hot-dip galvanizing → Water cooling & passivation → Zinc coating thickness inspection → Protective packaging
8. Quality Inspection Items (EN10204 3.1 Material Certificate Attached)
Dimensional Inspection: Leg width, leg thickness, length, inner arc radius, straightness, end cut inclination tolerance
Surface Inspection: Full inspection for cracks, laps, scabs, scratches, oxide scale, missing galvanizing and zinc nodules
Chemical Spectrum Analysis: Strictly controlled S≤0.045%, P≤0.045% to guarantee stable weldability
Mechanical Tests: Yield strength, tensile strength, percentage elongation, 180° cold bending test
Special Galvanizing Test (Galvanized Angle Steel): Zinc coating weight, adhesion, neutral salt spray test
Weight Deviation Sampling: Full bundle weighing, weight error meets national standard requirements
9. Main Application Fields
Steel Structure Workshop EngineeringFactory column supports, roof purlin brackets, door & window frames, equipment bases, maintenance platform frames
Power & Photovoltaic IndustryHigh-voltage transmission towers, photovoltaic tracking supports, lightning grounding brackets, cable trench supports, substation components
Warehousing & Logistics IndustryHeavy-duty storage racks, automated warehouse columns, pallet supports, warehouse partition frames
Transportation & Bridge InfrastructureBridge lateral stiffeners, highway guardrail posts, tunnel supports, internal ship structural parts
Municipal & Landscape EngineeringMunicipal guardrails, billboard frames, overpass handrail supports, river protection steel structures
General Machinery ManufacturingEquipment bases, machine frames, agricultural machinery parts, pipe hangers, small lifting supports
10. Packaging & Export Logistics
Same specification & length stacked in layers, bundled transversely & longitudinally with multiple steel strips, plastic end caps for edge protection; galvanized angle steel wrapped with multi-layer waterproof anti-rust paper inside, fixed on solid anti-slip wooden pallets and fully covered with rain tarpaulin for long-term sea moisture & collision prevention.
Stock ready within 5-7 days, container loading at Tianjin Port. FOB, CIF, CFR trade terms acceptable.
Attached complete documents: EN10204 3.1 material certificate, mechanical test report, galvanizing salt spray test report, dimensional & weight inspection sheet, packing list, commercial invoice.
11. Customization & Supporting Services
CNC cutting, beveling, punching, bending and drilling deep processing for non-standard leg width, thickness & length
Anti-corrosion customization: Shot blasting rust removal, epoxy anti-rust primer, heavy hot-dip galvanizing, high zinc coating anti-corrosion solution
Mass customization of high-strength Q355B equal & unequal angle steel
One-stop supply of complete galvanized angle steel packages for photovoltaic & tower projects, matched with bolts and connecting plates
Small batch sample orders & full container bulk export orders are both acceptable
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