Hot-rolled steel sheet piles are formed by rolling at high temperatures (above approximately 1000°C). They feature a dense structure, high strength, and excellent durability, making them suitable for large-scale projects demanding high load-bearing capacity and extended service life.
Cold-formed steel sheet piles are shaped through cold processing at ambient temperatures. They offer advantages such as lightweight construction, lower cost, and ease of transportation and installation. These characteristics make them commonly used in small-to-medium-sized or temporary projects.

One of the first tasks in inspecting steel pipes is to analyze their chemical composition to determine whether the material meets the standards or customer requirements. Routine chemical composition testing items include analysis of main elements and impurity elements. During the steel pipe production process, it is necessary to control the content of the chemical composition of the steel within a certain range to ensure the quality of the product. Therefore, chemical composition analysis is an essential test.

Physical property testing is an important part of steel pipe inspection, mainly including hardness test, tensile test, impact test and bending test. These tests can objectively analyze the performance of steel pipes under stress, provide users with valuable reference data, and also help steel pipe manufacturers control and improve their products.

Non-destructive testing is also required during the inspection process of steel pipes. This test can achieve non-destructive testing without destroying or damaging the samples. These include: ultrasonic testing, magnetic particle testing, eddy current testing and other technologies. The purpose of non-destructive testing is to discover and eliminate defects in steel pipes and improve product reliability and safety.

Metallographic analysis is an important test item for steel pipe inspection. It is used to check whether the organizational structure of steel pipes during the production process meets the corresponding standards and to find defects therein. Typically, metallographic analysis involves a variety of microscopy techniques, such as optical microscopy, electron microscopy, etc.

These testing items can effectively control the quality of steel pipes and ensure the safety and reliability of products in actual use.

Steel pipe inspection services include:
Thickness testing, eddy current testing, corrosion testing, quality testing, roundness testing, corrosion testing, dimensional testing, flaw detection, nondestructive testing, and impact strength testing.

Physical and Chemical Property Inspections
1. Chemical Composition Inspection: This primarily checks whether the carbon, sulfur, and phosphorus content of the steel pipes meet standard requirements.
2. Mechanical properties test: including tensile strength, yield strength, impact toughness, etc. These indicators are directly related to the service life and safety performance of steel pipes.
3. Weld performance inspection: Welding is one of the important processes of steel pipes. It is very important to inspect the strength and reliability of the welds. Generally, weld tensile and bending tests are used.
4. Corrosion performance and wear resistance test: These indicators are mainly used to evaluate the corrosion resistance and wear resistance of steel pipes under specific environmental conditions.

Appearance and Geometric Dimension Inspection
1. Surface Inspection: This primarily checks the surface quality of the steel pipe for defects such as cracks, scars, and bubbles.
2. Dimension inspection: Check whether the outer diameter, wall thickness, length and other parameters of the steel pipe meet the requirements, and also check the straightness and curvature of the steel pipe.
3. Appearance inspection: Check whether the appearance quality and shape of the steel pipe meet the standard requirements.

Cold galvanizing (electrogalvanizing): zinc is gradually plated onto the metal surface through unidirectional current in the electroplating tank. The production speed is slow, the coating is uniform, and the thickness is thin, usually only 3-15 microns. The appearance is bright, smooth, and beautiful, but the corrosion resistance is poor and it will generally rust within a few months.

Hot-dip galvanizing, also known as hot-dip galvanizing, is a method of removing oil and rust from steel workpieces to present a clean, wet surface, and then immediately immersing them in a plating tank where zinc has been heated and melted in advance to form a layer of zinc coating on the surface of the workpiece. The hot-dip galvanized coating is thicker, generally 30-60 microns, and has a higher corrosion resistance.

Cold-dip galvanized wire: It is a metal composite material made of low-carbon steel as the core wire through wire drawing and electrogalvanizing process. It is mainly used in the manufacture of wire mesh, highway guardrails and construction projects.

Hot-dip galvanized wire: This product is made of high-quality carbon structural steel through drawing and hot-dip galvanizing. It is widely used in the manufacture of wire mesh, highway guardrails and construction projects. It has the characteristics of thick coating, strong corrosion resistance and firm coating.

1. Hot-Dip Galvanizing of Steel Wire
Hot-dip galvanizing of steel wire involves pickling steel and then immersing it in a molten zinc bath for galvanizing. At high temperatures, the steel surface reacts chemically with the zinc solution to form a zinc alloy coating, which provides corrosion protection. The process temperature of hot-dip galvanizing is usually around 450°C, so it can form a coating with a thicker thickness, higher density and better corrosion resistance.

2. Cold-Dip Galvanizing of Steel Wire
Cold-dip galvanizing of steel wire involves electrolytically depositing a zinc coating on the steel surface. The process temperature of cold galvanizing is below 100°C, thus preventing deformation and damage to the steel. However, the coating thickness of cold-dip galvanizing is thinner and its corrosion resistance is slightly inferior to that of hot-dip galvanizing.

1. Corrosion Resistance
Due to the thicker and denser coating of hot-dip galvanizing, it offers better corrosion resistance. Under the same environment, hot-dip galvanized coating has a longer service life.

2. Cost
Cold-dip galvanizing of steel wire is relatively inexpensive because the process is simpler than hot-dip galvanizing. However, since the coating of cold-dip galvanizing is thinner, hot-dip galvanizing is required in some special occasions to obtain better anti-corrosion effect.

3. Appearance
Hot-dip galvanizing produces a smoother and more uniform coating than cold-dip galvanizing, resulting in a more aesthetically pleasing finish. However, in some cases, cold-dip galvanizing may provide a better surface treatment.