มาตรฐาน ASTM เหล็กรูปตัว His an economical cross-section high-efficiency profile with more optimized cross-sectional area distribution and a more reasonable strength-to-weight ratio. ตั้งชื่อเพราะว่าหน้าตัดเหมือนกับตัวอักษรภาษาอังกฤษ “H” Since all parts of the H-Beam are arranged at right angles, the H-Beam has the advantages of strong bending resistance in all directions, simple construction, cost saving and light structural weight, and has been widely used.