Structural Steel Sections

Structural steel is a category of steel used for making construction materials in a variety of shapes. It is primarily composed of iron and carbon, often alloyed with manganese and other elements to enhance strength and durability. The density is typically around 7.85 g/cm³ and the melting point is approximately 1510°C (depending on the alloy). Structural steel possesses high tensile strength, ductility, and toughness, making it indispensable in modern construction. It is widely used in the framework of buildings, bridges, transmission towers, and industrial machinery due to its excellent load-bearing capacity and weldability. It can be hot-rolled or cold-formed into various standardized cross-sectional shapes such as beams, channels, and angles.

Structural Steel Sections Products

Name	Definition	Features	Size Range	Common ASTM Grades	Main Applications
Angles Steel	L-shaped cross-section with two legs joined at a 90-degree angle; can be equal or unequal legs.	Versatile, easy to bolt and weld; provides two-way stiffness.	Side Width: 20-200mm Thickness: 3-24mm	A36, A572, A529	Brackets, framing, shelving, transmission towers, reinforcement trimming.
Channel Steel	C-shaped or U-shaped cross-section consisting of a web and two flanges.	Good structural support, ideal for frames where a flat back is needed for mounting.	Height: 50-400mm Leg Width: 25-100mm	A36, A572, A588	Building frames, vehicle chassis, machinery bases, wall studs.
I-Beam Steel	I-shaped cross-section (often called S-beams) with tapered flanges and a narrower web.	High bending resistance relative to weight; traditional structural shape.	Height: 80-600mm Flange Width: 46-170mm	A36, A572, A992	Hoist tracks, elevators, trailer beds, structural support for lighter loads.
H-Beam Steel	H-shaped cross-section (Wide Flange beams) with parallel flanges that are wider than I-beams.	Superior load distribution, high strength-to-weight ratio; handles shear and bending well.	Height: 100-900mm Flange Width: 100-300mm	A992, A572, A709	Columns, main beams in skyscrapers, bridges, piling.
T-Bar Steel	T-shaped cross-section, essentially a beam split longitudinally.	Lightweight, strong in tension, good surface area for attachment.	Width/Height: 20-150mm Thickness: 3-15mm	A36, A572	Trusses, ceiling suspension grids, window frames, machinery stiffeners.
Steel Rails	Specialized profile with an asymmetric I-shape designed for rolling loads (head, web, foot).	Extreme wear resistance, high hardness, high compressive strength.	Weight typically 8-60 kg/m (Light to Heavy rail)	A1 (Carbon Steel Rail), A759 (Crane Rail)	Railway tracks, subway lines, crane runways, mine cart tracks.

Structural Steel Standards Comparison

USA (ASTM)	China (GB)	Europe (EN)	International (ISO)	Main Composition	Characteristics
A36	Q235B	S235JR	E235B	C ≤ 0.26%, Mn, P, S	Low carbon ("mild") steel. Good weldability and machinability. The standard for general structural applications like angles and channels.
A572 Gr.50	Q355B (formerly Q345)	S355JR	E355	Low Carbon, V/Cb/Nb alloys	High-strength low-alloy (HSLA) steel. Higher yield strength (50 ksi/345 MPa) allowing for lighter structure weights. Common for beams.
A992	Q355	S355	-	C, Mn, Si, V, Cu	The standard grade for Wide Flange (H-beams) in the US. Excellent ductility and weldability with 50 ksi min yield strength.
A588	Q355GNH	S355J0W	-	Cu, Cr, Ni, P	"Weathering steel" (Corten equivalent). Forms a protective rust patina. Corrosion-resistant, used in bridges and exposed structures.
A709	Q345q	S355	-	-	Standard strictly for bridge steel. Available in various strength grades (36, 50, 50W). High impact toughness requirements.

FAQ

Q1: How do you guarantee the quality of your products?

A1: According to production standards, we can also accept third-party inspections, and all products undergo strict quality inspection before packaging.

Q2: What is your delivery time?

A2: It mainly depends on your location and demand, usually the delivery time is around 7-10 days after deposit arrived , if there is stock in our warehouse, we can send out within 3 days.

Q3: Can custom products be produced?

A3: We support custom products in different sizes, designs and finishes.

Q4: Can you provide samples?

A4: Yes, we can provide samples for free, but need buyer to provide shipping cost. Also can provide customized samples according to your drawing , sample charge can be refunded when bulk order released