Feature pages

28/08/2024

FEATURE|The Analysis of the Impact of China's New Rebar Standard-GB 1499.2-2024

On June 25, 2024, China announced the new national standard for rebar -GB 1499.2-2024 (after this referred to as the new national standard) and announced that the policy would be officially implemented on September 25, with a buffer period of 3 months.

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29/07/2024

FEATURE| The Knowledge Summary of Seamless, Welded Steel Pipes, Stainless Steel Pipes, and Special-shaped Steel Pipes

A steel pipe is a steel material with a hollow section whose length is much greater than its diameter or circumference. Steel pipes have the advantages of high strength and durability, and those pipes are easy to cut, weld, and form.

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28/06/2024

FEATURE| Analysis of the Difference Between Galvanized Steel Sheet and Galvalume Steel Sheet & Plate

Galvanized steel sheet & plate and galvalume steel sheet & plate are two common anti-corrosion steel plates widely used in construction, automobiles, home appliances, and other fields. The two products have similarities and differences.

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04/06/2024

FEATURE|A New Fashion in the Field of House Construction, Colored Stone Metal Tile

Stone-coated metal roofing tile not only has the natural, deep, and excellent decorative properties of traditional clay tile but also has the light, strong, and durable performance of modern metal tile. It is the main trend in the development of international advanced roofing materials.

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30/04/2024

FEATURE|Comparison of Common Mold Steel Grades in China and Other Countries

Mold steel is a type of steel used to make molds, such as cold stamping dies, hot forging dies, and die-casting dies. Molds are the main processing tools for manufacturing parts in industrial sectors such as machinery manufacturing, radio instruments, motors, and electrical appliances. Since the production standards of various countries are different, this has caused certain difficulties for customers in international trade. CSMC will organize and display the Chinese grades and other countries' grades to help customers conduct trade more smoothly.

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29/03/2024

FEATURE|The Brief Summary of Common Container Knowledge

Container refers to a large loading container with a certain strength, stiffness, and specifications specially designed for turnover use. The characteristics of containers are that they have a uniform format and can be stacked layer by layer. Therefore, they can be placed in large numbers on ocean-going ships. It can provide manufacturers around the world with high-volume shipping services that are cheaper than air freight.

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01/03/2024

FEATURE|The Shipping Company Indispensable in International Trade

In short, shipping companies help facilitate the smooth flow of international trade by providing comprehensive cargo transportation services. They play a key role in global supply chains, facilitating the flow of cross-border goods and supporting the globalized economy.

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Page 3 of 4

Short News

16/10 17:44

< On October 16, the price of channel steel in Tangshan did not fluctuate significantly. Q235B (ASTM A36) Dianli 18# (180*68*7.0) 478.40, down 1.50. (USD/ton)
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16/10 17:43

< On October 16, the price of hot rolled steel coil in Tianjin did not fluctuate significantly. Q235B (ASTM A36) HBIS 2.75*1500*C 487.37, down 2.99. (USD/ton)

16/10 17:39

< On October 16, the price of galvanized welded pipe in Tianjin remained stable. Q215 (ASTM A283 Gr.C) Juncheng DN20 (3/4"*2.75mm) 656.30. (USD/ton)

16/10 17:38

< On October 16, the price of cold-rolled steel sheet and coil in Shanghai did not fluctuate significantly. SPCC (ASTM A1008 CS) Baosteel 1.2*1250*C 571.09, down 2.99. (USD/ton)
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16/10 17:33

< On October 16, the price of boiler steel plate in Nanjing remained stable. Q245R (ASTM A285 Grade C) from Nangang16mm, 620.42 (USD/ton).

16/10 17:25

< On October 16, the price of low alloy high strength plate in Rizhao fell slightly. Q460C (S460NL) Rizhao Steel 18 (hot rolled) 633.88, down 4.48. (USD/ton)
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Answers

Causes of Common Production Problems in Q235 Spiral Pipes
Common Defects and Causes of Spiral Steel Pipes: Loosening, bubbles, shrinkage cavities, residues, non-metallic inclusions, segregation, white spots, cracks, and various abnormal fracture defects in spiral steel pipes.
Causes of Segregation in Q235 Spiral Pipes: During casting and solidification, selective crystallization and diffusion can cause the aggregation of certain elements, leading to uneven chemical composition. Depending on the distribution location, this can be classified as ingot segregation, center segregation, and point segregation.
Causes of porosity in Q235 spiral tubes: During hot working, gaps are created by the solidification shrinkage of low-melting-point materials and the release of gas, preventing the steel from being welded. Based on their basic distribution, porosity can be divided into two types: centrally located type and generally loose type.
Can galvanized pipes be painted?
You can paint them, but not directly.
Since galvanized pipes have a smooth surface and a highly reactive zinc coating, they must first be cleaned and sanded, then coated with a specialized primer (such as epoxy zinc yellow primer or zinc phosphate primer), followed by a compatible topcoat (such as epoxy paint, polyurethane paint, or water-based acrylic paint). At the same time, avoid using ordinary latex paint, paints containing copper pigments, and alkyd paints, as these can cause peeling, flaking, or accelerated corrosion.
What are the common coating processes for anti-corrosive spiral steel pipes?
The coating scheme for anti-corrosive spiral steel pipes is determined by the operating environment.
The three-layer polyethylene (3PE) coating system combines epoxy powder, an adhesive layer, and a polyethylene layer to form a structurally stable protective barrier.
Epoxy coal tar coating involves the alternating application of epoxy coal tar paint and glass fiber cloth, creating a water- and corrosion-resistant coating system. Internal cement mortar lining forms a smooth inner surface on the pipe wall, helping to reduce flow resistance.
Epoxy powder coating utilizes high-density polyethylene as a base material, balancing mechanical strength with corrosion resistance. Each process has its own specific advantages; the appropriate method should be selected based on the conveyed medium and installation conditions.


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