Knowledge

16Oct, 2025

4. What is the value of hot-dip galvanized steel pipe?
Hot-dip galvanized steel pipes outperform their non-galvanized counterparts by 10-15 times in service life, effectively doubling the production capacity of steel pipes (commonly ca
16Oct, 2025

3. Why should the surface of steel products be hot galvanized?
Steel is highly susceptible to corrosion in air, water, or soil, which can lead to complete deterioration. Annually, corrosion-related steel losses account for approximately one-te
16Oct, 2025

2. What is the principle of hot-dip galvanizing?
When steel components are immersed in molten zinc, a solid solution between zinc and iron forms at the interface through dissolution and diffusion processes. As zinc continues to p
11Oct, 2025

1. What is hot-dip galvanizing?
Hot galvanizing, also known as hot galvanized zinc, is to immerse the steel components that have been rust removed and other pretreatment into the molten zinc liquid, and form a la
11Oct, 2025

30. Why does spiral welded pipe need demagnetization? What is demagnetization?
Demagnetization, as the name suggests, refers to eliminating or weakening magnetic properties in materials. The fundamental principle involves altering the internal arrangement of
08Oct, 2025

29.3.Why ultrasonic inspection?
The principle of ultrasonic testing is as follows: When ultrasonic waves propagate through inspected materials, changes in acoustic properties and internal structures of the materi
08Oct, 2025

29.2.3.X What are the inspection standards for light?
ISO 10893-6 Non-destructive Testing of Steel Pipes-Part 6: Radiographic Inspection of Welded Joints for Defect Detection ISO 10893-7 Non-destructive Testing of Steel Pipes-Part 7:
29Sep, 2025

29.2.2. What are the advantages of TV observation?
The advantage of X-ray television observation is that it can directly observe the inside of an object in static and dynamic conditions, and can be observed for many times. It does
26Sep, 2025

29.2.1.X What are the inspection methods for light inspection?
The X-ray inspection methods are photographic method, fluorescent screen observation method and TV observation method. We use TV observation method.
26Sep, 2025

29.2. Why do X-ray inspection?
X-ray flaw detection is a non-destructive testing method that utilizes X-rays (or γ-rays and other high-energy radiation) to penetrate metal materials. By detecting variation
24Sep, 2025

29.1. Why conduct a static water pressure test?
As a pressure-bearing pipeline, the hydrostatic testing of spiral welded pipes is an essential procedure. Each steel pipe must undergo hydrostatic testing, and the test pressure an
24Sep, 2025

29. How to ensure the quality of spiral welded pipes? What tests are required?
The production quality control of spiral welded pipes is a comprehensive and systematic process that covers all aspects from raw material selection, production process control to f

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