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Help CenterAngle Steel & Angle Bar，EN 10056-1、ASTM A36/A572 Gr50、JIS G3192、ISO 630
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1. Product Overview
Angle steel, commonly called angle iron, is long section steel with L-shaped cross-section and two perpendicular legs. It is divided into four categories: hot rolled equal angle steel, hot rolled unequal angle steel, hot-dip galvanized angle steel and cold-formed angle steel. Manufactured by high-temperature rolling of low-carbon steel and HSLA steel billets, it features stable cross-section and strong bending resistance. It can be assembled into various load-bearing frames and connecting joints by welding or bolts. Widely applied in indoor steel structures, outdoor anti-corrosion projects, power, photovoltaic, machinery and shipbuilding industries. Compliant with domestic hot rolled section steel standards and mainstream European, American & Japanese export industrial standards, custom processing including fixed-length cutting, punching, bending and full hot-dip galvanizing is available.
Applicable Standards
Domestic StandardsGB/T 706-2016 Hot Rolled Section Steel, GB/T 6723 Cold Formed Section Steel, GB/T 13912 Metallic Coatings – Hot-Dip Galvanized Coatings, GB/T 700 Carbon Structural Steel, GB/T 1591 High Strength Low Alloy Structural Steel
International Export StandardsEN 10056-1, ASTM A36/A572 Gr50, JIS G3192, ISO 630
2. Main Steel Grades & Application Conditions
Q235B / S235JR / A36 / SS400 (General Carbon Steel)Excellent plasticity and weldability with cost advantage, for factory frames, storage racks, indoor supports, general steel structure connectors and small equipment bases
Q355B/C/D/E / S355JR / A572 Gr50 (HSLA Steel)High yield strength and outstanding low-temperature impact toughness, for photovoltaic brackets, power transmission towers, bridge fittings, outdoor heavy-duty structures and projects in severe cold areas
Q235 for Galvanizing SubstrateFully hot-dip galvanized with uniform zinc layer, for power earthing, lightning protection brackets, coastal factories and open-air anti-corrosion structures
3. Product Classification by Manufacturing Process
Hot Rolled Equal Angle Steel (Main Stock Product)Two legs with identical width, size range 2#~20# (leg width 20~200mm), black hot rolled surface, balanced stress, preferred material for roof trusses and beam-column supports
Hot Rolled Unequal Angle SteelCombination of long & short legs (30×20~200×150mm), reasonable cross-section to save steel, for towers, bridges and asymmetric equipment supports
Hot-Dip Galvanized Angle SteelFully degreased & pickled then hot-dip galvanized with firmly bonded zinc layer, superior salt spray resistance, dedicated for outdoor, buried and power engineering
Cold Formed Thin-Wall Angle SteelCold rolled strip continuously bent at room temperature, high dimensional precision & light weight, for light racks, decorative frames and weak current indoor supports
4. Complete Production Process
Hot Rolled Angle Steel Process
Incoming inspection & flaw detection of square billets → Heating in furnace at 1000~1200℃ → Multi-pass groove rolling to form L-shape → Sizing, straightening & cooling → Cutting to fixed length → Full inspection of appearance & dimension → Marking & coding → Bundling with steel strips & warehousing
Galvanized Angle Steel Process
Degreasing & oil removal of finished angle steel → Hydrochloric acid pickling for oxide scale removal → Water washing & neutralization → Flux dipping & wetting → Hot-dip galvanizing at 460~520℃ → High-pressure air blowing to remove excess zinc → Passivation anti-rust treatment → Inspection & packing
Cold Formed Angle Steel Process
Uncoiling of cold rolled strip → Continuous cold bending forming → Straightening & fixed-length cutting → Shearing & packing
5. Core Specification & Technical Parameters
Dimension Range
Equal Angle Steel: Leg width 20mm~250mm, leg thickness 3mm~24mm; marking example ∠50×50×5
Unequal Angle Steel: Long leg 30~200mm, short leg 20~150mm, thickness 3~18mm; marking example ∠63×40×6
Standard Fixed Length: 6m, 9m, 12m, customized cutting length 0.5–15m available
Dimensional ToleranceHot rolled angle steel: Leg width ±1.0mm, thickness ±0.3~0.8mm, straightness ≤2mm/m; cold formed angle steel tolerance controlled within ±0.15mm
Zinc Coating Index (Galvanized Angle Steel)Average zinc coating thickness ≥85μm, coating weight ≥600g/㎡, pass neutral salt spray test ≥800h without peeling or missing plating
Mechanical Performance
Q235B: Yield strength ≥235MPa, tensile strength 375~500MPa, no cracking after 180° cold bending
Q355B: Yield strength ≥355MPa, qualified low-temperature impact property for long-term alternating high & low temperature outdoor service
Surface OptionsHot rolled black finish, sandblasted rust removal, bright cold formed surface, silver-gray hot-dip galvanized surface
6. Core Product Advantages
Balanced & stable bearing capacity with L-shaped cross-sectionEqual angle steel delivers consistent bidirectional bearing capacity; unequal angle steel adapts to asymmetric loads. Easy splicing, welding and bolting with firm joints resistant to deformation.
Excellent machinability for welding, punching & bendingModerate carbon equivalent prevents cracking during gas cutting & arc welding; on-site punching, cutting and bending available for fast assembly of steel structures.
Complete anti-corrosion system for long outdoor service lifeHot-dip galvanizing provides cathodic protection via zinc layer to isolate moisture, acid & alkali soil corrosion, much longer service life than black hot rolled angle steel for open-air, coastal and chemical plant environments.
Full range of specifications & lightweight material savingFull sizes from light small supports to heavy load-bearing components. Unequal angle steel optimizes cross-section to reduce steel consumption under equal load, cutting overall engineering cost.
Stable mechanical performance with high safety factorHigh-temperature rolling eliminates internal defects such as lamination and pores, uniform strength along full length, widely adopted for high safety-grade projects including power transmission and bridges.
Sufficient Stock & Stable Delivery CycleFull series of materials and specifications in stock, shipped directly from Tianjin Port, production & delivery cycle 5–7 days. One-stop custom processing including punching, bending, galvanizing and fixed-length cutting available for bulk orders.
7. Main Application Fields
Steel Structure Factory Engineering: Roof trusses, beam & column supports, wall posts, stair treads, embedded parts and reinforcement braces
Power & New Energy Industry: Transmission towers, photovoltaic brackets, cable trench supports, galvanized earthing & lightning protection angle steel, busbar supports
Municipal Transportation: Bridge reinforcement parts, road guardrails, lamp post bases, traffic sign brackets and tunnel supports
Machinery Manufacturing: Equipment frames, agricultural machinery frames, forklift fittings and small load-bearing supports for lifting equipment
Warehousing & Logistics: Warehouse storage racks, platform frames, steel guardrails and cargo support structures
Shipbuilding & Chemical Industry: Ship deck supports, industrial furnace frames, reactor supports and container frames
Construction & Decoration: Ceiling keels, metal door frames, handrails and small decorative steel structures
8. Factory Inspection & Complete Qualification Documents
Full-item inspection for every piece per batch with complete export supporting documents attached:
Full dimensional inspection of leg width, thickness, length, straightness and appearance
Mechanical performance test including tensile and cold bending, room-temperature impact test
Additional zinc coating weight, adhesion and neutral salt spray anti-corrosion test for galvanized angle steel
Spectral chemical composition analysis to verify material grade
Original Mill Test Certificate EN 10204 3.1, factory certificate, SGS third-party inspection report, CE certification documents
9. Packaging, Marking & Logistics Delivery
Packaging: Same specifications bundled uniformly with steel strips, metal corner protectors installed at both ends to avoid collision damage; export goods wrapped with waterproof plastic film and fixed on wooden pallets for sea transportation moisture & rust resistance
Marking: Permanent printing on side of each bundle including material grade, specification model, length, heat number, execution standard and manufacturer information; product qualification label attached to each bundle
Delivery: Direct shipment from warehouse to Tianjin Port, suitable for 20GP/40HQ full containers and bulk carriers; delivery cycle 5–7 days, FOB/CIF/CFR trade terms acceptable, full container & LCL export supported
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