###### Steel Pipe for Mechanical Engineering and Machine Components steel pipe

October 21, 2023###### What is Square Hollow Section (SHS) Pipes ?

October 26, 2023## Production Process Classification of Rectangular Tube

### WHAT ARE THE TYPES OF HOLLOW STRUCTURAL SECTIONS?

### 1. Seamless Rectangular Tube Production

**Hot Finished Seamless (HFS)**: Material is heated and pierced to create a hollow tube, then further heated and stretched to the desired size and wall thickness. The tube is then cooled and cut to length. This process results in a tube with no welds or seams.**Cold Drawn Seamless (CDS)**: Similar to HFS, but the tube is further processed in a cold state, providing closer dimensional tolerances and a better surface finish.

### 2. Welded Rectangular Tube Production

**Electric Resistance Welded (ERW)**: The strip is rolled into a tube, and then the seam is welded using electric resistance.**Submerged Arc Welded (SAW)**: Similar to ERW, but the welding process is submerged under a flux.

## Material Classification of Rectangular Pipe

### 1. Carbon Steel

**Low Carbon Steel**: Typically used in structural applications due to its high strength and ductility.**Medium Carbon Steel**: Offers a balance between strength and ductility, used in general-purpose applications.

### 2. Alloy Steel

**Low Alloy Steel**: Contains additional elements for improved strength and resistance to wear and temperature.**High Alloy Steel**: Contains a high percentage of alloying elements, providing superior strength and corrosion resistance.

## Standard Classification of Rectangular Pipe Production

**ASTM A500**: Standard for cold-formed welded and seamless carbon steel structural tubing.**ASTM A513**: Standard for electric resistance welded carbon and alloy steel mechanical tubing.**EN 10219**: European standard for cold formed welded structural hollow sections.

## The Shape Classification of the Rectangular Pipe Section

**Square Section**: Equal width and height, used in structural applications.**Rectangular Section**: Unequal width and height, used in a variety of applications where aesthetics or specific dimensions are important.

## Surface Treatment Classification of Rectangular Pipe

**Black (Self-Colored)**: No surface treatment.**Hot-Dipped Galvanized**: The pipe is dipped in a bath of molten zinc for corrosion resistance.**Electro-Galvanized**: Similar to hot-dipped, but the zinc coating is applied using an electrical current.**Powder Coated**: A dry powder is applied to the surface for color and corrosion resistance.

## Use Classification of Rectangular Pipe

**Structural**: Used in construction and engineering where strength is paramount.**Mechanical**: Used in machinery and automotive applications where precision and strength are required.**Decorative**: Used in architectural and aesthetic applications where appearance is important.

### SQUARE HOLLOW SECTION DIMENSIONS/SIZES TABLE

Size mm |
kg/m |
Size mm |
kg/m |

20 x 20 x 2.0 | 1.12 | 20 x 20 x 2.5 | 1.35 |

25 x 25 x 1.5 | 1.06 | 25 x 25 x 2.0 | 1.43 |

25 X 25 X 2.5 | 1.74 | 25 X 25 X 3.0 | 2.04 |

30 X 30 X 2.0 | 1.68 | 30 X 30 X 2.5 | 2.14 |

30 X 30 X 3.0 | 2.51 | 40 x 40 x 1.5 | 1.81 |

40 x 40 x 2.0 | 2.31 | 40 x 40 x 2.5 | 2.92 |

40 x 40 x 3.0 | 3.45 | 40 x 40 x 4.0 | 4.46 |

40 x 40 x 5.0 | 5.40 | 50 x 50 x 1.5 | 2.28 |

50 x 50 x 2.0 | 2.93 | 50 x 50 x 2.5 | 3.71 |

50 x 50 x 3.0 | 4.39 | 50 x 50 x 4.0 | 5.72 |

50 x 50 x 5.0 | 6.97 | 60 x 60 x 3.0 | 5.34 |

60 x 60 x 4.0 | 6.97 | 60 x 60 x 5.0 | 8.54 |

60 x 60 x 6.0 | 9.45 | 70 x 70 x 3.0 | 6.28 |

70 x 70 x 3.6 | 7.46 | 70 x 70 x 5.0 | 10.11 |

70 x 70 x 6.3 | 12.50 | 70 x 70 x 8 | 15.30 |

75 x 75 x 3.0 | 7.07 | 80 x 80 x 3.0 | 7.22 |

80 x 80 x 3.6 | 8.59 | 80 x 80 x 5.0 | 11.70 |

80 x 80 x 6.0 | 13.90 | 90 x 90 x 3.0 | 8.01 |

90 x 90 x 3.6 | 9.72 | 90 x 90 x 5.0 | 13.30 |

90 x 90 x 6.0 | 15.76 | 90 x 90 x 8.0 | 20.40 |

100 x 100 x 3.0 | 8.96 | 100 x 100 x 4.0 | 12.00 |

100 x 100 x 5.0 | 14.80 | 100 x 100 x 5.0 | 14.80 |

100 x 100 x 6.0 | 16.19 | 100 x 100 x 8.0 | 22.90 |

100 x 100 x 10 | 27.90 | 120 x 120 x 5 | 18.00 |

120 x 120 x 6.0 | 21.30 | 120 X 120 X 6.3 | 22.30 |

120 x 120 x 8.0 | 27.90 | 120 x 120 x 10 | 34.20 |

120 X 120 X 12 | 35.8 | 120 X 120 X 12.5 | 41.60 |

140 X 140 X 5.0 | 21.10 | 140 X 140 X 6.3 | 26.30 |

140 X 140 X 8 | 32.90 | 140 X 140 X 10 | 40.40 |

140 X 140 X 12.5 | 49.50 | 150 X 150 X 5.0 | 22.70 |

150 X 150 X 6.3 | 28.30 | 150 X 150 X 8.0 | 35.40 |

150 X 150 X 10 | 43.60 | 150 X 150 X 12.5 | 53.40 |

150 X 150 X 16 | 66.40 | 150 X 150 X 16 | 66.40 |

180 X 180 X 5 | 27.40 | 180 X 180 X 6.3 | 34.20 |

180 X 180 X 8 | 43.00 | 180 X 180 X 10 | 53.00 |

180 X 180 X 12.5 | 65.20 | 180 X 180 X 16 | 81.40 |

200 X 200 X 5 | 30.50 | 200 X 200 X 6 | 35.8 |

200 x 200 x 6.3 | 38.2 | 200 x 200 x 8 | 48.00 |

200 x 200 x 10 | 59.30 | 200 x 200 x 12.5 | 73.00 |

200 x 200 x 16 | 91.50 | 250 x 250 x 6.3 | 48.10 |

250 x 250 x 8 | 60.50 | 250 x 250 x 10 | 75.00 |

250 x 250 x 12.5 | 92.60 | 250 x 250 x 16 | 117.00 |

300 x 300 x 6.3 | 57.90 | 300 x 300 x 8 | 73.10 |

300 x 300 x 10 | 57.90 | 300 x 300 x 8 | 90.70 |

300 x 300 x 12.5 | 112.00 | 300 x 300 x 16 | 142.00 |

350 x 350 x 8 | 85.70 | 350 x 350 x 10 | 106.00 |

350 x 350 x 12.5 | 132.00 | 350 x 350 x 16 | 167.00 |

400 x 400 x 10 | 122.00 | 400 x 400 x 12 | 141.00 |

400 x 400 x 12.5mm | 152.00 | 400 x 400 x 16 | 192 |