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ASTM A36/A36M Angle steel Equal Angle Steel Unequal Angle Steel

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ASTM A36/A36M Angle steel Equal Angle Steel Unequal Angle Steel

Angle Steel (Angle Iron)

Angle steel (also known as angle iron) is a long, hot-rolled structural steel section with an 'L' shape in cross-section, consisting of two mutually perpendicular 'legs' (flanges). As one of the most widely used basic steel products in the industrial sector, its core advantages lie in its 'simple cross-section, easy assembly, and stable load-bearing capacity'. It can form various frames or support structures through welding and bolted connections, and is extensively applied in construction, machinery, transportation, chemical engineering, and other fields.

I. Core Characteristics of Angle Steel: Cross-Section, Classification, and Performance

1. Cross-Section Shape: Why 'L' Shape?

The cross-section of angle steel is composed of two mutually perpendicular flanges (commonly referred to as 'legs'), with uniform flange thickness, presenting a right-angled 'L' shape overall. The core value of this structure is:

Flexible load-bearing: It can withstand vertical pressure, horizontal shear force, and torque simultaneously, adapting to multiple functions such as 'support', 'connection', and 'reinforcement' (e.g., node connections in steel structure frames, edge reinforcement of equipment bases).
Easy assembly: The right-angle shape facilitates splicing with other steel sections such as flat steel, channel steel, and I-beams, enabling the formation of stable structures without complex processing (e.g., connections between shelf columns and crossbeams).
High material utilization: Compared with solid steel of the same weight, the 'L'-shaped cross-section can distribute stress more efficiently, balancing strength and cost.

2. Main Classifications: Categorized by Standards, Dimensions, and Materials

The classification logic of angle steel is clear, with different categories corresponding to different application scenarios. The key is to accurately match requirements through 'standards + specifications'.

Classification Dimension	Specific Categories	Description	Typical Applications
By Executive Standard	GB Angle Steel (China)	Complies with China's national standard (GB/T 706-2016 Hot-Rolled Steel Sections), with dimensions marked as 'leg width × leg width × leg thickness' (e.g., ∠50×50×5, leg width 50mm, leg thickness 5mm)	Domestic construction (steel structure workshops, curtain wall keels), household hardware
	ASTM Angle Steel (US)	Adheres to US ASTM standards (e.g., ASTM A36, A572), often called 'Angle Iron', with dimensions marked as 'inches + leg thickness' (e.g., L2×2×1/4, leg width 2 inches, leg thickness 1/4 inch)	Bridges in North America, container frames, mechanical supports
	EN Angle Steel (EU)	Follows EU EN standards (e.g., EN 10056), called 'Angle Section', with dimension marking similar to GB standards (unit: mm), and some require higher low-temperature toughness	Industrial equipment and civil buildings in Europe (e.g., balcony railings)
	JIS Angle Steel (Japan)	Conforms to Japan's JIS standards (JIS G 3101), called 'Yamagata Kō' (やまがたこう) in Japanese, with dimensions compatible with GB standards	Automobile chassis and electronic equipment racks in Japan
By Size Specification	Equal Angle Steel	The two flanges have the same width (e.g., ∠40×40×4, L3×3×3/8), and it is the most widely used (accounting for over 80% of total angle steel usage)	General support structures (e.g., shelves, billboard frames)
	Unequal Angle Steel	The two flanges have different widths (e.g., ∠63×40×5, L4×2×1/4), suitable for 'unbalanced load-bearing' scenarios	Eccentric supports (e.g., bridge bearings, heavy machinery bases)
	Light Angle Steel	Small leg width and thin leg thickness (e.g., ∠25×25×3, L1×1×1/8), light weight and low cost	Small equipment supports, furniture skeletons, decorative structures
	Heavy Angle Steel	Large leg width and thick leg thickness (e.g., ∠100×100×12, L6×6×3/4), strong load-bearing capacity	Load-bearing nodes in large workshops, port machinery frames
By Material	Carbon Structural Steel	Most commonly used (e.g., Q235B, ASTM A36), with low carbon content (≤0.25%), easy to weld and cut	General structural scenarios (over 90% of applications)
	Low-Alloy High-Strength Steel	Contains alloying elements such as manganese and silicon (e.g., Q355B, ASTM A572 Grade 50), with a yield strength of ≥345MPa	High-rise buildings, long-span bridges (scenarios requiring high strength)
	Stainless Steel	Contains chromium and nickel (e.g., 304, 316), corrosion-resistant and oxidation-resistant	Chemical equipment, food machinery, coastal buildings (humid/corrosive environments)
	Heat-Resistant Steel	Contains chromium and molybdenum (e.g., 12Cr1MoV), high-temperature resistant (can withstand temperatures above 600℃)	Boiler supports, metallurgical equipment (high-temperature working conditions)

II. Key Parameters of Angle Steel: How to Select the Right Type?

When selecting angle steel, three core parameters should be focused on, as they directly determine its load-bearing capacity and adaptability:

Leg Width (B/b): The width of the flanges (for equal angle steel, it is denoted by 'B', e.g., B=50mm; for unequal angle steel, it is denoted by 'B×b', e.g., B=63mm, b=40mm). The larger the leg width, the stronger the bending resistance.
Leg Thickness (d): The thickness of the flanges (e.g., d=5mm). The thicker the leg, the stronger the overall load-bearing capacity and deformation resistance (but the higher the weight and cost).
Theoretical Weight (kg/m): The weight of angle steel per meter (e.g., the theoretical weight of ∠50×50×5 is 3.77kg/m), used to calculate material consumption and cost.

In addition, reference should also be made to the yield strength (≥235MPa/345MPa, etc.) (to determine if it meets load requirements) and surface condition (hot-dip galvanized/black surface) (hot-dip galvanizing can improve corrosion resistance, suitable for outdoor scenarios).

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ASTM A36/A36M Angle steel Equal Angle Steel Unequal Angle Steel

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