H and I Beam Profiles
H-beams and I-beams are hot-rolled structural sections that carry bending loads efficiently. H-beams have wide parallel flanges suited to columns and beams, while I-beams have narrower tapered flanges suited mainly to beams spanning between supports. Both profiles are available in Q235 carbon steel for building work.
The Q235 Grade
Q235 is the general structural carbon steel to GB/T 700 with a minimum yield strength of 235 MPa. It combines adequate strength for light and medium frames with good weldability and formability, and it is the most widely specified grade for building structures in many markets.
Sizes and Sections
Light sections such as 150x75 mm are commonly used for secondary beams, purlin supports and equipment framing. The full size range extends from small sections below 150 mm to large columns above 400 mm, and the theoretical weight per meter of each size is published in the standard tables.
Applications in Building Frames
Secondary beams and floor supports in steel buildings.
Light columns and frames for workshops and sheds.
Platforms, walkways and equipment supports.
Members for fabricated frames and small structures.
Quality Assurance
Sections are checked for dimensions, straightness and surface condition, and the steel is tested for yield strength, tensile strength and elongation. Mill test certificates accompany every delivery to support fabrication and inspection.
Frequently Asked Questions
Q: What does a size like 150x75 mean?
The first number is the section height and the second is the flange width, both in millimeters.
Q: When should an I-beam be used instead of an H-beam?
An I-beam is often chosen for pure bending service, while an H-beam with wider flanges is preferred for columns and biaxial loading.
Q: Is Q235 suitable for welding?
Yes, Q235 is readily weldable with standard procedures and consumables.
Q: What lengths are available?
Standard lengths are 6 m and 12 m, and custom lengths can be cut to the project requirements.
Q: Are material certificates provided?
Yes, mill test certificates are supplied with each delivery.