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.工藝分類

1. Process classification

方管按生產工藝分：熱軋無縫方管、冷拔無縫方管、擠壓無縫方管、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.

其中焊接方管又分為：

The welded square pipe is divided into:

(a)按工藝分——電弧焊方管、電阻焊方管(高頻、低頻)、氣焊方管、爐焊方管。

(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)按焊縫分——直縫焊方管、螺旋焊方管。

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

2.材質分類

2. Material classification

方管按材質分：普碳鋼方管、低合金方管。普碳鋼分為：Q195、Q215、Q235、SS400、20#鋼、45#鋼等；低合金鋼分為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.生產標準分類

3. Production standard classification

方管按生產標準分：國標方管，日標方管，英制方管，美標方管，歐標方管，非標方管。

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.斷面形狀分類

4. Section shape classification

方管按斷面形狀分類：

Square pipes are classified according to section shape:

(1)簡單斷面方管——方形方管、矩形方管。

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

(2)復雜斷面方管——花形方管、開口形方管、波紋形方管、異型方管。

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

5.表面處理分類

5. Classification of surface treatment

方管按表面處理分：熱鍍鋅方管、電鍍鋅方管、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.用途分類

6. Use classification

方管按用途分類——裝飾用方管、機床設備用方管、機械工業用方管、化工用方管、鋼結構用方管、造船用方管、汽車用方管、鋼梁柱用方管、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.壁厚分類

7. Wall thickness classification

方管按壁厚分類——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.