Square tube is a kind of square tube with good corrosion resistance and good effect, which has been loved by many users. With the continuous progress of manufacturing technology and the increase of people's demand, there are many different categories of the product. So you know what? Let the small editor of Jinan square tube manufacturer take you to have a brief understanding.

1.工艺分类

1. Process classification

方管按生产工艺分：热轧无缝方管、冷拔无缝方管、挤压无缝方管、焊接方管。

Square tubes are divided into hot-rolled seamless square tubes, cold drawn seamless square tubes, extruded seamless square tubes and welded square tubes according to the production process.

其中焊接方管又分为：

The welded square pipe is divided into:

(a)按工艺分——电弧焊方管、电阻焊方管(高频、低频)、气焊方管、炉焊方管。

(a) According to the process, it is divided into arc welding square tube, resistance welding square tube (high frequency and low frequency), gas welding square tube and furnace welding square tube.

(b)按焊缝分——直缝焊方管、螺旋焊方管。

(b) According to the weld - straight welded square pipe and spiral welded square pipe.

2.材质分类

2. Material classification

方管按材质分：普碳钢方管、低合金方管。普碳钢分为：Q195、Q215、Q235、SS400、20#钢、45#钢等；低合金钢分为Q345、16Mn、Q390、ST52-3等。

Square tubes are divided into ordinary carbon steel square tubes and low alloy square tubes according to material. Ordinary carbon steel is divided into: Q195, Q215, Q235, SS400, 20# steel, 45# steel, etc; Low alloy steels are divided into Q345, 16Mn, Q390, St52-3, etc.

3.生产标准分类

3. Production standard classification

方管按生产标准分：国标方管，日标方管，英制方管，美标方管，欧标方管，非标方管。

Square tubes are divided into national standard square tubes, Japanese standard square tubes, British standard square tubes, American standard square tubes, European standard square tubes and non-standard square tubes according to production standards.

4.断面形状分类

4. Section shape classification

方管按断面形状分类：

Square pipes are classified according to section shape:

(1)简单断面方管——方形方管、矩形方管。

(1) Simple section square tube - square tube, rectangular tube.

(2)复杂断面方管——花形方管、开口形方管、波纹形方管、异型方管。

(2) Square pipe with complex section - flower shaped square pipe, open square pipe, corrugated square pipe and special-shaped square pipe.

5.表面处理分类

5. Classification of surface treatment

方管按表面处理分：热镀锌方管、电镀锌方管、涂油方管、酸洗方管。

Square pipes are divided into hot-dip galvanized square pipes, electro galvanized square pipes, oiled square pipes and pickled square pipes according to surface treatment.

6.用途分类

6. Use classification

方管按用途分类——装饰用方管、机床设备用方管、机械工业用方管、化工用方管、钢结构用方管、造船用方管、汽车用方管、钢梁柱用方管、特殊用途方管。

Square tubes are classified by purpose - square tubes for decoration, square tubes for machine tool equipment, square tubes for mechanical industry, square tubes for chemical industry, square tubes for steel structure, square tubes for shipbuilding, square tubes for automobile, square tubes for steel beams and columns, and square tubes for special purposes.

7.壁厚分类

7. Wall thickness classification

方管按壁厚分类——超厚壁方管、厚壁方管和薄壁方管。

Square tubes are classified according to wall thickness - super thick wall square tubes, thick wall square tubes and thin wall square tubes.