one、Define hot rollingHSection steel is a type of steel produced through high-temperature rolling technology，Its cross-section is“H”form，Having an economic cross-section、The characteristic of reasonable strength to weight ratio。It is widely used in architecture、bridge、Fields such as mechanical manufacturing。
two、Classification Hot RollingHSteel sections can be divided into the following categories based on the width of the flange：Wide flangeHsection steel（HW）：Wide wing edge，Suitable for structures that can withstand large bending moments，Like factory beams and columns。
Middle wing edgeHsection steel（HM）：Moderate wing width，Suitable for frame columns and frame beams。
Narrow wing edgeHsection steel（HN）：The wing edge is relatively narrow，Commonly used in areas where lateral load-bearing requirements are not high。
thin-wallHsection steel（HT）：Suitable for lightweight structures。
three、Characteristics: Reasonable cross-sectional shape：HThe Science of Section Design for Steel Structures，Can effectively distribute stress，Strong carrying capacity。
Superior mechanical performance：Compared to ordinary I-beams，HThe section modulus of steel is larger，Higher bending resistance and torsional stiffness。
Save metal materials：Under the premise of meeting the same structural requirements，HSteel sections can save more than ordinary I-beams30%-40%The amount of metal used。
light weight，Easy to construct：High load-bearing capacity per unit volume，Lighter weight，Suitable for high-rise buildings and large-span bridges。
Easy to assemble and combine：Parallel inner and outer legs，The end is a right angle，Easy to weld、Riveting and bolted connections。
Environmental advantages：Adopting dry construction method，Low noise、Less dust，Minor damage to land resources。
four、Technical parameters are based on the latest national standardsGB/T 11263-2024，hot-rollingHThe technical parameters of the steel section have been updated as follows：Allowable size deviation：The classification of height and width is more refined，Add allowable deviation for web wave（Wave Height≤2mm/m）。
Allowable weight deviation：follow±6%Adjust to±5%，Higher accuracy。
Center deviation：The offset of the center of the belly plate is≤3mmAdjust to≤2mm（H≤400mmtime）。
New specifications added：Maximum specification expansion toH1700×550mm，F(xiàn)ill the domestic gap。
five、Application field: Architecture field：Used for high-rise buildings、Large span factory building、Steel structure residential buildings, etc，Can increase the usable area of the building。
bridge engineering：Suitable for large-span bridges、Cross sea bridge beams, etc，Oversized specificationsHSteel sections can replace welded composite beams。
Industrial structures：Beams used for manufacturing industrial plants、column、Bracket, etc。
infrastructure：Used for subway stations、Tunnel support、Foundation piles, etc。
marine engineering：Thin walls with high requirements for corrosion resistanceHSteel sections are suitable for offshore platforms。