工字鋼：工字鋼鋼質型材的一種，也稱鋼梁，是截面為工字形的長條鋼材--由此得名“工字鋼”。TherollingofHsteelisdifferentfromordinaryI-beamonlywithasetofhorizontalrolls。 工字鋼 規(guī)格及型號 其規(guī)格以腰高的毫數(shù)表示，如“工160×88×6”，即表示腰高為160毫米，腿寬為88毫米，腰厚為6毫米的工字鋼。 標稱規(guī)格 工字鋼的規(guī)格也可用型號表示，型號表示腰高的厘米數(shù)，如工16#。

I-steel: a steel bar of I-steel, also known as steel beam, is a long steel section of the cross section, which is called "i-i-steel". The specificati and types of I-steel are represented by the number of waist height, such as "160 x 88 x 6", that is, I-bar with waist height of 160 mm, leg width of 88 mm and waist thickness of 6 mm. The specificati of the nominal size of the I-steel can also be expressed by the model, and the size of the height of the waist is centimetre, such as the 16#.

工字鋼如名所示，是一種“工”字形截面型鋼，上下翼緣內(nèi)表面有傾斜度，一般為1：6，使得翼緣外薄而內(nèi)厚，因此造成工字鋼在兩個主平面的截面特性相差巨大，在應用中難以發(fā)揮剛才的強度特性。BecausetheshapeofthesectionisthesameasthatoftheEnglishletter"H"。雖然工字鋼市場上上也出現(xiàn)了加厚工字鋼，但工字鋼的結構已經(jīng)決定了其抗扭性能短板。

I like the name suggests, is a kind of I-shaped section steel flange on the inner surface of slope is generally 1:6, the flange and the thickness of thin, resulting in two main characteristics of I-beam section plane is huge, just to play strength characteristics in the application. Although the I-steel market has also appeared to be thickened I-steel, the structure of I-steel has already determined its torsional performance.

工字型鋼不論是普通型還是輕型的，由于截面尺寸均相對較高、較窄，故對截面兩個主袖的慣性矩相差較大，因此，一般僅能直接用于在其腹板平面內(nèi)受彎的構件或將其組成格構式受力構件。

I-steel whether ordinary or light, because the section size are relatively high and narrow, so the moment of inertia of the main secti of the two sleeve is large, therefore, generally only can be directly used in the web plane bending member or the of lattice stress components.

隨著科學技術和工業(yè)的發(fā)展，對材料提出了更高的要求，如更高的強度，抗高溫、高壓、低溫，耐腐蝕、磨損以及其它特殊物理、化學性能的要求，碳鋼已不能完全滿足要求。

With the development of science and technology and industry, the material has put forward higher requirements, such as higher strength, high temperature, high pressure, low temperature, corrosion resistance, wear and other special physical and chemical properties, carbon steel can not fully meet the requirements.