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Solid angle steel, also known as equilateral angle steel or L-beam steel, is a kind of long steel with right-angle 'L' shaped cross-section, which consists of two equal or unequal width sides connected vertically. As one of the core materials in the field of metal structure, it is widely used in the fields of construction, machinery manufacturing, bridge engineering, electric power equipment and so on by virtue of its high-strength, easy processing and economic and practical characteristics. The solid cross-section design gives it excellent compressive and bending resistance, and can withstand heavy loads and dynamic stresses. The surface can be galvanized, sprayed or painted, which improves the corrosion resistance by more than 50% and adapts to the environment from -40℃ to 300℃. It can be quickly fixed by welding and bolting, and supports multi-angle combination, which improves the construction efficiency by 30%. Low cost of raw materials, recycling rate of over 90%, significant advantages in whole life cycle cost.

Product Parameter (Specification)

Products description:

Product information	parameter	Product intormation	Parameter
Product name	Stainless steel angle bar	Standard	ASTM, JIS, DIN, EN
Length	Customised to customer requirements	Certification	ISO, SGS
Grade-ASTM	304,316,430,Q235,A36,SS400,Q345,Q390& other	Price term	FOB
Technique	Cold-formed hot rolled	Payment terms	T/T L/C
Packaging and delivery
Note : bundle, plastic bags, thin film, wooden pallet, standard seaworthy export packing or as customer demands

Product Feature and Application

Construction and Infrastructure Field

● Main Structure Support

High-rise building frames: used as beam-column connectors of steel structure buildings for lateral force-resistant support system. For example, a 200m super high-rise building adopts 150×150×14mm angle steel made of Q345B, with a single node bearing pressure of over 25 tonnes.

Industrial plant truss: It is used for roof triangular truss diagonal bracing, and the span can be more than 50 metres.

Seismic Reinforcement: In the renovation of old buildings, the seismic grade is upgraded to Grade 8 by outsourcing concrete columns with angles.

● Auxiliary system construction

Curtain wall keel: Match with aluminium alloy profiles to build unit-type glass curtain wall support system, with spacing precision controlled within ±2mm.

Equipment base: lift shaft support frame, central air-conditioning unit platform, adjustable design to adapt to different equipment sizes.

the field of transport

● Bridge engineering

Steel box girder bulkhead: galvanised angle steel is used to make transverse stiffening ribs in cross-sea bridges, with a life span of 50 years of salt spray corrosion resistance.

Bridge pier cofferdam support: the temporary construction framework uses detachable angle steel structure, with a reuse rate of 80%.

● Railway traffic

Contact network pillar: high-speed railway along the use of Q420 high-strength angle steel, resistant to wind speed 40m/s lateral load.

Metro tube corridor support: fire-coated angle steel system passed BS6853 smoke toxicity test.

the field of energy and power

● Electric power facilities

Transmission Tower: Extra-high-voltage line tower adopts ∠200×18mm angle steel main material, and the amount of steel used for single base tower reaches 80 tonnes.

Substation frames: double-layer angle steel truss structure achieves 10m cantilever span to meet the needs of 500kV equipment installation.

● New energy equipment

Photovoltaic Racking System: 316L stainless steel angle steel is used for the coastal beach project, with a tilt angle of 22° to optimise light efficiency.

Wind power pedestal: Combined angle steel anchor cage adapts to 3m deep rock foundation, with pull-out resistance ≥600kN.

machinery manufacturing field

● Heavy machinery

Engineering machinery chassis: crane slewing support base using double-layer angle welding, fatigue life of more than 100,000 cycles.

Mining equipment support: Q550D high-strength steel angle beam structure, impact resistance increased by 40%.

● Automated production line

AGV navigation track: precision bending angle steel guide rail, flatness error ≤ 0.3mm/m.

Robot protection fence: removable angle steel frame passed ISO10218 safety certification.

Ship and Marine Engineering

● Hull structure

Bulkhead reinforcement: use marine grade A angle steel, -60℃ low temperature impact work ≥34J.

Deck support frame: salt spray corrosion-resistant coating thickness ≥85μm.

● Marine platform

Conduit rack node: large thickness (≥25mm) angle steel forgings are used for deep water conduit rack key connection.

Mooring system base: combined angle steel pile foundation can withstand 2000 tonnes of mooring force.

warehousing and logistics field

● Heavy duty racking system

Beam type racking column: adopts cold-formed angle steel, single layer static load-bearing can reach 5000kg.

Shuttle car track: precision levelling angle steel guide rail, straightness error ≤ 1mm/10m.

● Automated three-dimensional warehouse

Stacker rail beam: Q390C angle steel structure, span 12m deflection ≤ 1/800.

Conveyor bracket: modular quick-fit angle steel frame, installation speed increased by 60%.

Agriculture and Municipal Facilities

● Modern agriculture

Intelligent greenhouse skeleton: hot-dipped galvanised angle steel arch frame, spanning 8m with snow load resistance 0.5kN/㎡.

Breeding net box frame: floating angle steel structure can carry 10 tonnes of feed automatic feeding system.

● Municipal engineering

Street light pole base: combined angle steel ground cage meets the requirements of 12 grade typhoon anti-tipping.

Pedestrian bridge guardrail: Imitation wood grain spraying angle steel columns passed EN1090 certification.

special field applications

● Space launchers

Special high-temperature resistant angle steel is used in the support structure of the deflector channel, which is resistant to the instantaneous high temperature of 3000℃.

● Nuclear power plant shielding wall

Boron steel composite angle module, neutron absorption cross-section of 3800 barn.

● Polar research station

Ultra-low temperature toughness angle (-80℃ AKV≥27J) is used for Antarctic modular building connectors..

Production Details

The product specifications in the following table are regular specifications, if there are special circumstances, we can be customised according to customer requirements

Type	Side length (mm)	Thickness (mm)	Theoretical weight (kg/m)	Length (m)
Equilateral angle	20×20	3	0.89	6(customizable)
	30×30	3	1.37
	40×40	4	2.42
	50×50	5	3.77
	60×60	6	5.42
	80×80	8	9.66
Unequal angles	30×20	3	1.12	6(customizable)
	40×25	4	2.11
	50×30	5	3.05
	60×40	6	4.58

FAQ

Q: What is the difference between solid and hollow angles?

A: Structural differences: solid angle steel cross-section is solid L-shaped, hollow angle steel (such as square tube cutting) hollow inside.
Performance comparison:
Solid Angle: high compressive/bending strength, suitable for load-bearing structures (e.g. building frames, equipment bases).
Hollow angle: light weight, low cost, commonly used in decorative or light load scenarios (e.g. exhibition stands, partitions).
Price difference: under the same specification, the price of solid angle is usually 15-30% higher than that of hollow angle.

Q: What are the common materials of solid angle? How to choose?

A: Mainstream material:
Q235B carbon steel: general purpose, suitable for construction, shelves and other conventional scenes.
Q355B low alloy steel: 20% higher strength, suitable for bridges, heavy machinery.
304/316 stainless steel: strong corrosion resistance, used in chemical and coastal environments.
Selection principle:
Choose Q235B for normal indoor environment
High humidity/corrosive environment Choose 304 stainless steel, coastal choose 316
Low temperature/heavy load scenario Select Q355D, -20℃ impact toughness up to standard.

Q: What do I need to pay attention to when welding solid angles?

A: Pre-treatment: grinding to remove the surface oxide layer, oil stains need to be cleaned with acetone.
Welding process:
Carbon steel: use J422 welding rod, current control at 120-160A.
Stainless steel: use A102 welding rod, argon arc welding is preferred.

Q: How to ensure structural stability when installing angles?

A: Node reinforcement: additional triangular reinforcement plate at the stress node, thickness ≥ 1.2 times the thickness of the angle.
Span control: single angle suspended span is recommended ≤ 40 times the side width, such as side width 50mm, span ≤ 2m.
Anti-deformation measures: set up transverse tie rods for every 3 metres of long span structure, and the deflection is controlled within 1/500.

Q: How to deal with angle steel after rusting?

A: Step-by-step repair method:
Rust removal: light corrosion is polished with wire brush, heavy corrosion needs sandblasting (Sa2.5 grade).
Anti-corrosion: Apply epoxy zinc-rich primer (80μm) + polyurethane top coat (60μm).
Monitoring: check the coating breakage once every half a year and make up the coating in time.

Q: In what direction will angle steel develop in the future?

A: Lightweight: 10-15% weight reduction through alloy optimisation while maintaining strength.
Smart: Angles with built-in stress sensors to monitor structural health in real time.
Green: Zero-chromium passivation process reduces heavy metal contamination by 90%.
Customisation: 3D laser cutting enables the processing of complex shaped angles with ±0.1mm accuracy.