What Is an A36 H Beam
An A36 H beam is a hot-rolled structural steel section manufactured to ASTM A36, the most widely specified carbon structural steel in North America. The H-shaped cross section, with wide flanges and a parallel web, provides excellent bending resistance and load distribution. A36 steel contains less than 0.26 percent carbon, giving it good weldability, machinability, and formability for large-scale fabrication and fast-track construction.
Mechanical Properties
A36 steel has a minimum yield strength of 250 MPa, equivalent to 36 ksi, which gives the grade its name, and a tensile strength of 400 to 550 MPa. Brinell hardness is typically 119 to 162 HB. The material is not heat treatable for strengthening, so properties are obtained directly from the hot-rolled condition.
Size Range
A36 H beams are defined by web height, flange width, web thickness, and flange thickness. The standard production range covers web heights from 100 to 900 mm, flange widths from 100 to 300 mm, web thicknesses from 6 to 21 mm, and flange thicknesses from 8 to 35 mm, with lengths from 6 to 12 m. Customized dimensions can be rolled according to project drawings.
Theoretical Weights
Typical theoretical weights include 100 by 50 by 5 by 7 mm at 9.54 kg per meter, 150 by 150 by 7 by 10 at 31.9 kg per meter, 200 by 200 by 8 by 12 at 50.5 kg per meter, 250 by 250 by 9 by 14 at 72.4 kg per meter, 300 by 300 by 10 by 15 at 94.5 kg per meter, 400 by 400 by 13 by 21 at 172 kg per meter, 500 by 200 by 10 by 16 at 89.6 kg per meter, 600 by 200 by 11 by 17 at 106 kg per meter, 700 by 300 by 13 by 24 at 185 kg per meter, and 900 by 300 by 16 by 28 at 243 kg per meter. These values support structural calculations and transport planning.
Section Efficiency
Compared with traditional I-beams, the H-shaped section increases the moment of inertia and section modulus about the strong axis, allowing higher loads with optimized material usage. The wide flanges also provide good lateral stability and simplify bolted and welded connections.
Fabrication and Applications
Because of its low carbon content, A36 H beam can be cut, welded, drilled, and formed without complex preheating or post-treatment, reducing fabrication cost and lead time. It is used for beams and columns in factory buildings, high-rise structures, and warehouses; in bridges, underground support systems, and transportation facilities; and in machinery manufacturing, shipbuilding, and equipment support structures.
Frequently Asked Questions
Q: What does A36 stand for?
A: The A indicates ferrous metal and 36 the minimum yield strength of 36,000 psi.
Q: Is A36 equivalent to SS400?
A: A36 is commonly considered equivalent to JIS SS400 for general structural use.
Q: What is the hardness of A36 steel?
A: Typically 119 to 162 HB.
Q: What sizes are available?
A: Web heights from 100 to 900 mm with standard lengths of 6 to 12 m.
Q: Can A36 H beam be welded easily?
A: Yes, its low carbon content makes it highly weldable without preheat.
Q: What applications use A36 H beam?
A: Buildings, bridges, machinery, shipbuilding, and industrial frameworks.
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