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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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29/01/2024

FEATURE|Common Stainless Steel Types References

Common stainless steel classifications include martensitic steel, ferritic steel, austenitic steel, duplex stainless steel, etc. There are many different stainless steel models under each classification. This article lists the model names of various stainless steel materials.

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29/12/2023

FEATURE| Common Stainless Steel Surface Processing (Treatment) Technologies

The stainless steel surface treatment process plays an important role in the manufacturing of stainless steel products, and it has a significant impact on the appearance, corrosion resistance, mechanical properties, and service life of the product.

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30/11/2023

FEATURE| Common Metal Surface Processing Technologies

In this article, CSMC will focus on seven surface treatment technologies. At the same time, CSMC will use pictures and text to illustrate these seven surface treatment processes. We hope this will be helpful to our customers.

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27/10/2023

FEATURE|Coating Color Reference for Prepainted Steel Plates--RAL Color Card

In this article, CSMC marks the colors of pre-painted steel plates commonly used in the steel trade according to the different coating materials on the surface of the pre-coated steel plates, hoping to help to customers.

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28/09/2023

FEATURE|Chinese and English Comparison of Names of Large Steel Factory in China

In this article, CSMC will focus on several famous steel mills, such as Beijing Shougang, Shanghai Baosteel, and Hebei Jingye. At the same time, CSMC will organize the names of large steel mills in China and match their Chinese names and abbreviations with their English abbreviations for customers' reference.

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31/08/2023

FEATURE|Correspondence between Chinese and other National Steel Grades

The steel grade is a numbering system used to identify different types and properties of steel. Every country or region has its steel grade system, and these grades are usually composed of numbers, letters, and symbols, which could describe the composition, properties, uses, and other information of steel.

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Short News

09/05 17:21

< On May 9, the price of angle steel in Tangshan rose slightly. Q235B (ASTM A36) Zhengfeng 125*125*10mm 505.68, up 8.82. (USD/ton)
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09/05 17:18

< On May 9, the price of shipbuilding steel plates in Shanghai rose slightly. CCSB (ABS-B) Shougang 8mm 590.94, up 7.35. (USD/ton)
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09/05 17:14

< On May 9, the price of galvalume steel sheet & coil in Guangzhou remained stable. DX51D+AZ150 (ASTM A792/A792M CS) Panzhihua Steel 1.0*1250*C 708.54 (USD/ton)

09/05 17:10

< On May 9, the price of hot rolled steel plate in Tangshan rose slightly. Q235B (ASTM A36) HBIS 7.5*1500*6000mm, 504.21, up 5.88. (USD/ton)
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09/05 17:03

< On May 9, the price of cold rolled ribbed rebar in Nanjing rose slightly. CRB600H (ASTM A615 Grade 80) Qingyan Φ12mm 608.58, up 5.88. (USD/ton)
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09/05 17:02

< On May 9, the price of hard cold-rolled coils in Shanghai rose slightly. SPCC-1B (ASTM A1008 CS) common 0.25*1000*C 577.71, up 4.41. (USD/ton)

Answers

Corrosion Resistance Levels of Hot-Dip Galvanized Pipes？
When purchasing ductile iron pipes, what technical indicators and acceptance criteria should be given special attention?
What are the effects of changes in the hot-dip galvanized coating at high temperatures on its properties?
Under high temperature conditions, the hot-dip galvanized layer will undergo a series of changes, which will affect its performance as follows: Appearance changes: High temperature may cause the color of the hot-dip galvanized layer to change, turning yellow, gray, or even black. This is because high temperatures cause the zinc layer to oxidize, generating different zinc oxides, which in turn affect the appearance and color of the coating.
Changes in microstructure: The microstructure of the hot-dip galvanized layer changes at high temperatures. Zinc grains grow, and grain boundaries become blurred. This change in organizational structure alters the mechanical properties of the zinc layer, typically resulting in decreased hardness and increased toughness.
Changes in corrosion resistance: Generally speaking, within a certain temperature range, the corrosion rate of hot-dip galvanized layers will accelerate as the temperature increases. This is because high temperatures accelerate the chemical reaction between zinc and oxygen, moisture, and other corrosive media in the air, and may also damage the passivation film on the zinc layer surface, reducing its protective effect on the substrate. When the temperature exceeds a certain limit, the zinc layer may peel or flake off, further losing its protective properties.


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