螺纹钢直径符号和螺纹钢型号是消费者在购买螺纹钢时必须要考虑的因素，这个是不能不知的，在很多建筑图纸中，我们会发现Φ这个符号，有些朋友不知道这是什么意思。其实这是螺纹钢直径符号。螺纹钢直径符号是用来表示钢筋直径的大小，比如钢筋直径为20mm,那么就表示为Φ20。
Rebar diameter and thread steel types are symbol factors of consumers must purchase rebar to consider, this is not known, in many architectural drawings, we will find that with this symbol, some friends don't know what it means. In fact, this is the diameter symbol of thread steel. The diameter of the steel mark is used to indicate the diameter of the steel bar. For example, the diameter of the steel bar is 20mm, then it is expressed as "20".

螺纹钢也是分型号的。螺纹钢型号的划分可以从多个角度，济钢一级代理一般主要根据其化学成分、制作工艺、外部形态、直径大小以及用途来划分。如果我们按直径大小来划分的话，就分为粗钢筋、细钢筋和钢丝，它们的主要区别就是直径大小不同。
Thread steel is also of different sizes. The type of threaded steel can be divided from many angles, the first class agent of Jinan Iron and Steel Co., Ltd., mainly based on its chemical composition, manufacturing process, external shape, diameter and use. If we are divided by diameter, they are divided into coarse steel bars, thin steel bars and steel wires. The main difference is that they are different in diameter.
纹钢是表面带肋的钢筋，亦称带肋钢筋，通常带有2道纵肋和沿长度 方向均匀分布的横肋。横肋的外形为螺旋形、人字形、月牙形3种。济钢一级代理用公称直径的毫米数表示。带肋钢筋的公称直径相当于横截面相等的光圆钢筋的公称直径。带肋钢筋由于肋的作用，和混凝土有较大的粘结能力，因而能更好地 承受外力的作用。带肋钢筋广泛用于各种建筑结构、特别是大型、重型、轻型薄壁和高层建筑结构。
Ribbed steel is a surface ribbed steel bar, also called ribbed steel bar, usually with 2 longitudinal ribs and transverse ribs uniformly distributed along the length. The transverse rib shape is helical, herringbone, crescent 3. The first grade agent of Jinan Iron and steel company is represented by the nominal diameter of millimeters. Nominal diameter of round steel bars of equal diameter equal to the cross section of ribbed bars. Because of the function of rib and the greater bonding ability of concrete, ribbed steel bar can bear the effect of external force better. Ribbed steel bars are widely used in a variety of building structures, especially large, heavy, light, thin-walled and high-rise structures.
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