1. The 100x100 Equal Angle
An equal angle of 100 by 100 millimetres has two legs of the same length and a thickness that depends on the weight class. It is a hot-rolled carbon steel product with a rounded root and slightly rounded leg edges. The compact L-shape makes it efficient in bracing, purlins, lintels, tower members and fabricated support brackets.
2. Grades and Standards
S235JR and S275JR to EN 10025-2 cover general structural work with good weldability and impact properties at room temperature. SS400 to JIS G3101 and ASTM A36 are closely comparable general structural steels used across Asia and the United States. ASTM A572 Grade 50 and Grade 60 are higher-strength low-alloy steels with about 345 and 415 megapascals minimum yield, chosen where load or weight limits demand more capacity from the same section.
3. Sizes and Section Properties
The 100 millimetre angle is rolled in a series of thicknesses, each with its own mass per metre, area and principal-axis radii of gyration. Designers use the principal-axis values because the section is not symmetric about a single axis, and they check the angle for combined compression and bending where the load is not concentric.
4. Fabrication and Connections
Angles are bolted or welded through the legs, with gusset plates at the ends of bracing members. Removing mill scale and confirming leg squareness produce better welds. For higher-strength grades such as A572 Grade 60, the fabricator confirms a matching welding procedure, since the low-alloy chemistry is less forgiving than that of A36.
5. Ordering and Verification
Orders state the grade, leg size, thickness, length, quantity and surface treatment, and shipping documents should include a mill test certificate with chemistry and mechanical results. For export packing the sections are bundled and strapped, with lengths planned around container or break-bulk limits.
Frequently Asked Questions
Q: Which grade is the general-purpose choice?
S235JR, SS400 and A36 are all general-purpose, and the project specification decides which one applies.
Q: When is A572 Grade 50 or 60 used?
When the load or a weight limit requires higher strength from the same section size.
Q: How is a 100x100 angle specified?
By the standard, grade, leg size, leg thickness, length and quantity.
Q: Can it be drilled and punched?
Yes, drilling and punching are routine, and punched holes should meet the edge-distance rules of the design code.
Q: Does the angle need surface protection?
Exposed angles are usually galvanized or painted, while sheltered members may be left as rolled.