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Steel Pipe Cross-Sectional Properties Type/Model Outer Diameter Wall Thickness Cross-Sectional Area Weight Weight I W r mm mm mm cm^2 kg/m m^2/m cm^4 cm^3 cm 30x2 30 2 1.759 1.381 0.094 1.730 1.15 0.99 30x2.5 30 2.5 2.160 1.695 0.094 2.060 1.37 0.98 34x2 34 2 2.011 1.578 0.107 2.580 1.52 1.13 34x2.5 34 2.5 2.474 [...]

Common Steel Pipe Specifications Table Pipe diameters should be measured in millimeters (mm), and the expression of pipe diameters should conform to the following regulations: Water and Gas Transmission Steel Pipes (galvanized or non-galvanized), Cast Iron Pipes, etc.: The pipe diameter should be indicated by the nominal diameter DN. Seamless Steel Pipes, Welded Steel Pipes (straight seam [...]

**Steel Pipe Welding Techniques for Connecting Steel Pipes and Flanges**   ### (1) Steel Pipe Butt Welding and Splicing 1. **Steel Pipe Butt Welds** - **Between any two adjacent nodes, there must not be two splicing points in the steel pipe butt welds, and the minimum length of the connecting pipe should be greater than 800 [...]

### Seamless Steel Pipe Production Process The general production process of seamless steel pipes can be categorized into **cold drawing** and **hot rolling**. The production process of cold-rolled seamless steel pipes is generally more complex than that of hot-rolled pipes. The pipe billet first undergoes three-roll continuous rolling. After extrusion, a sizing test is performed. If [...]

### Differences Between Hot-Rolled and Cold-Rolled Seamless Steel Pipes 1. **Manufacturing Process**: - **Hot-rolled seamless steel pipes** are made by heating a round billet, piercing it, and then rolling it using a three-roll skew rolling process, continuous rolling, or extrusion. After rolling, the pipe goes through sizing, cooling, straightening, hydrostatic testing (or inspection), marking, and then [...]

### Introduction to Common Types of Seamless Steel Pipes 1. **Structural Pipes**: These normally refer to seamless steel pipes used for general structural and mechanical structures. The standard for fluid seamless steel pipes applies to seamless pipes used for conveying fluids. The main difference between fluid seamless pipes and structural seamless pipes is that the former [...]

### Working Principle and Applications of Multi-Roll Cold Rolling Pipe Mill A **cold rolling pipe mill** is a piece of equipment used for cold rolling of hollow tubes using a ring-shaped die. This machine is particularly effective for initial rolling and for producing seamless tubes with common accuracy, including non-ferrous metals. The most notable feature of [...]

The medium-frequency hot expansion process is applied to large-diameter seamless steel pipe production. It was unprecedented in the industry at the time and not initially accepted by the domestic market. As the first to adopt this technology, the company faced significant resistance during the initial product launch and promotion. The company's chairman took an innovative approach [...]

  Introduction to Seamless Steel Pipe Standards 1. Structural seamless pipes (GB/T8162-2008) are used for general structural and mechanical purposes. 2. Fluid transport seamless steel pipes (GB/T8163-2008) are for transporting water, oil, gas, and other fluids. 3. Low and medium pressure boiler seamless steel pipes (GB3087-2008) are used for manufacturing various low and medium pressure boiler [...]

01 What is finishing? Finishing refers to a series of operations performed after product rolling to meet the final requirements of users regarding surface quality, dimensions, shape, and certain performance aspects of the product. It mainly includes flame cleaning, cooling after hot processing, cutting, straightening, physical detection of defects, grinding, marking, packaging, and other processes. 02 [...]