工字鐵係一種建造業廣泛應用嘅鋼，因為橫切面似漢字「工」字而得名。呢種結構抗彎曲同埋抗剪切剛度好強，但係抗力矩嘅剛度就差尐。

國際標準

歐洲聯盟 
 EN 10024:1995 - Hot rolled taper flange I sections – Tolerances on shape and dimensions
 EN 10034:1993 - Structural steel I and H sections –Tolerances on shape and dimensions

英國 
 BS4-1:2005 - Structural steel sections - Part 1: Specification for hot-rolled sections

日本 
 JIS A5526:2005 - Steel H Piles
 JIS G3192:2008 - Dimensions, mass and permissible variations of hot rolled steel sections

中華人民共和國 
 GB/T 706-1988 – 熱軋工字鋼尺寸、外形、重量及允許偏差
 GB/T 11263-1998 – 熱軋Ｈ型鋼和剖分Ｔ型鋼
 YB 3301-1992 - 焊接Ｈ型鋼

美國 
 ASTM A6 / A6M - 11 – Standard Specification for General Requirements for Rolled Structural Steel Bars, Plates, Shapes, and Sheet Piling
 ASTM A36 / A36M - 08 - Standard Specification for Carbon Structural Steel
 ASTM A992 / A992M - 11 - Standard Specification for Structural Steel Shapes

澳洲、紐西蘭 
 AS/NZS 3679.1:2010 – Structural Steel - Hot-rolled bars and sections
 AS/NZS 3679.2:2010 – Structural Steel - Welded I sections

鋼
建築材料