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。挑選時，膠合板要木紋清晰，正面光潔平滑，不毛糙，要平整無滯手感。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(jié)構(gòu)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.

H型鋼是一種斷面力學性能較工字鋼優(yōu)良的經(jīng)濟型斷面鋼材，因其斷面的形狀與英文字母“H”相同而得名。熱軋H型鋼的翼緣比工字鋼寬、側(cè)向剛度大、抗彎能力強。同等規(guī)格下H型鋼理重較工字鋼輕。

H steel is a kind of economical section steel with better section mechanical properties than that of I-steel. Because the shape of the section is the same as that of the English letter "H". The flange of hot rolled H steel is wider than that of I-steel, large lateral stiffness and strong bending resistance. Under the same specification, the weight of H steel is lighter than that of I-steel.

隨著科學技術(shù)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.