There are many kinds of reinforcing bars, which are generally classified according to chemical composition, production process, rolling shape, supply mode, diameter and use in structure.

1．按化學(xué)成分分

1. According to chemical constituents

碳素鋼鋼筋和一般低合金鋼筋。碳素鋼鋼筋按碳量多少，又分為低碳鋼鋼筋（含碳量低于0.25％，如I級鋼筋），中碳鋼鋼筋（含碳量0.25％～0.7％，如IV級鋼筋），高碳鋼鋼筋（含碳量0.70％～1.4％，如碳素鋼絲），碳素鋼中除含有鐵和碳元素外，還有少數(shù)在鍛煉過程中帶有的硅、錳、磷、硫等雜質(zhì)。一般低合金鋼鋼筋是在低碳鋼和中碳鋼中參加少數(shù)合金元素，獲得強(qiáng)度高和歸納功能好的鋼種，在鋼筋中常用的合金元素有硅、錳、釩、鈦等，一般低合金鋼鋼筋首要品種有：20MnSi、40Si2MnV、45SiMnTi等。

Carbon steel bar and general low alloy steel bar. According to the amount of carbon, carbon steel bars are divided into low carbon steel bars (carbon content is less than 0.25%, such as grade I bars), medium carbon steel bars (carbon content is 0.25%-0.7%, such as grade IV bars), high carbon steel bars (carbon content is 0.70%-1.4%, such as carbon steel wires). In addition to iron and carbon elements, carbon steel contains a few impurities such as silicon, manganese, phosphorus and sulfur in the process of exercise. This is the case. Generally, low-alloy steel bars take part in a few alloying elements in low-carbon steel and medium-carbon steel to obtain steel grades with high strength and good inductive function. The commonly used alloying elements in steel bars are silicon, manganese, vanadium, titanium and so on. Generally, the main types of low-alloy steel bars are 20MnSi, 40Si2MnV, 45SiMnTi, etc.

2．按軋制外形分

2. According to rolling shape

（1）光面鋼筋：I級鋼筋（Q235鋼鋼筋）均軋制為光面圓形截面，供給方式有盤圓，直徑不大于10mm，長度為6m~12m。

(1) Smooth reinforcing bars: Grade I reinforcing bars (Q235 reinforcing bars) are all rolled into smooth circular cross-section. The supply mode is circular, with a diameter not more than 10 mm and a length of 6 m~12 M.

（2）帶肋鋼筋：有螺旋形、人字形和月牙形三種，一般Ⅱ、Ⅲ級鋼筋軋制成人字形，Ⅳ級鋼筋軋制成螺旋形及月牙形。

(2) Ribbed bars: spiral, herringbone and crescent. Generally, grade II and III bars are rolled into herringbone and grade IV bars are rolled into helical and crescent shapes.

（3）鋼線（分低碳鋼絲和碳素鋼絲兩種）及鋼絞線。

(3) Steel wire (low carbon steel wire and carbon steel wire) and strand.

（4）冷軋扭鋼筋：經(jīng)冷軋并冷扭成型。

(4) Cold-rolled and twisted bars: cold-rolled and cold-twisted.

3．按直徑巨細(xì)分

3. Subdivision by diameter

鋼絲（直徑3~5mm）、細(xì)鋼筋（直徑6~10mm）、粗鋼筋（直徑大于22mm）。

Steel wire (diameter 3-5mm), fine steel bar (diameter 6-10mm), thick steel bar (diameter greater than 22mm).

4．按力學(xué)功能分

4. According to mechanical function

Ⅰ級鋼筋（235/370級）；Ⅱ級鋼筋（335/510級）；Ⅲ級鋼筋（370/570）和Ⅳ級鋼筋（540/835）

Grade I (235/370), Grade II (335/510), Grade III (370/570) and Grade IV (540/835)

5．按生產(chǎn)工藝分

5. According to the production process.

熱軋、冷軋、冷拉的鋼筋，還有以Ⅳ級鋼筋經(jīng)熱處理而成的熱處理鋼筋，強(qiáng)度比前者更高。

The strength of hot-rolled, cold-rolled and cold-drawn steel bars and heat-treated steel bars made of grade IV steel bars is higher than that of the former.

6．按在結(jié)構(gòu)中的效果分：受壓鋼筋、受拉鋼筋、架立鋼筋、散布鋼筋、箍筋等裝備在鋼筋混凝土結(jié)構(gòu)中的鋼筋，按其效果可分為下列幾種:

6. According to the effect in the structure, the steel bars equipped with compression, tension, erection, dispersal and stirrup in the reinforced concrete structure can be divided into the following categories according to their effect:

（1）受力筋——接受拉、壓應(yīng)力的鋼筋。

(1) Stress bar - steel bar that accepts tension and compression stress.

（2）箍筋——接受一部分斜拉應(yīng)力，并固定受力筋的方位，多用于梁和柱內(nèi)。

(2) Stirrups, which accept part of the cable-tension stress and fix the direction of the stressed reinforcement, are mostly used in beams and columns.

（3）架立筋——用以固定梁內(nèi)鋼箍的方位，構(gòu)成梁內(nèi)的鋼筋骨架。

(3) erecting bars, which are used to fix the orientation of steel hoops in beams and form the steel frame in beams.

（4）散布筋——用于屋面板、樓板內(nèi)，與板的受力筋筆直布置，將接受的分量均勻地傳給受力筋，并固定受力筋的方位，以及反抗熱脹冷縮所引起的溫度變形。

(4) Dispersive reinforcement - used in roof slabs and floor slabs. It is arranged in a straight line with the stressed reinforcement of the slabs. The accepted weight is evenly transmitted to the stressed reinforcement, and the orientation of the stressed reinforcement is fixed, as well as the temperature deformation caused by thermal expansion and cold contraction is resisted.

（5）其它——因構(gòu)件結(jié)構(gòu)要求或施工裝置需求而裝備的結(jié)構(gòu)筋。如腰筋、預(yù)埋錨固筋、環(huán)等。

(5) Other structural bars equipped for structural requirements of components or construction devices. Such as waist tendons, embedded anchorage tendons, rings, etc.

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