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  • 30/04/2026

    FEATURE| Zinc Coating: The Most Cost-Effective Corrosion Protection for Steel Structures

    This article contains engineering technical information on the selection of galvanized coatings for corrosion protection, covering the mechanisms, process comparisons, international standards, thickness testing methods, and selection recommendations based on environmental corrosion levels for hot-dip galvanizing and electro-galvanizing, for reference only.

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  • 30/03/2026

    FEATURE|Green Steel Buyers’ Guide: CBAM 2026, Carbon Costs & Low-Carbon Certifications Explained

    This article primarily outlines the core framework and cost accounting logic of the CBAM 2026 policy, clarifies the essential differences between terms such as "green steel," "low-carbon emission steel," and "near-zero emission steel," and interprets the "hard currency" status of the EPD (Environmental Product Declaration) in international procurement. It aims to help international buyers see through the fog of "green labels" and make informed procurement decisions in the new era of green trade.

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  • 03/03/2026

    FEATURE| Complete Guide to Color Steel Tiles: Structure, Performance, and Comparison

    This article comprehensively covers the definition, classification (single-layer panels and sandwich composite panels), model specifications and characteristics of various panel types, performance advantages, and fire safety precautions for color steel tiles (profiled steel sheets). Through a multi-dimensional comparison with colored stone tiles, it elucidates the fundamental differences between the two materials in terms of composition, performance, and applications.

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  • 29/01/2026

    FEATURE| Complete List and Selection Reference of Industrial Pipe Fittings

    This article comprehensively explores the pivotal role of pipe fittings as the “joints” of piping systems. It provides a detailed explanation of their definition, common types and functions, performance characteristics of different materials, and selection criteria. Furthermore, it analyzes the current industry trends toward high-end, intelligent, and green development.

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  • 29/12/2025

    FEATURE| Steel Pipe Coating System Guide: Selection, Application to Delivery Practice

    This article comprehensively outlines the importance, technical classification, inspection and transportation essentials, engineering selection methodology, and future trends of steel pipe coatings, serving as a complete technical guide for engineering projects.

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  • 28/11/2025

    FEATURE| Corrugated Steel Culvert: The Solution for Cost Reduction and Efficiency Improvement in Infrastructure Engineering

    Using corrugated steel culverts instead of traditional concrete culverts for culvert construction offers unparalleled advantages in terms of construction time, cost, and environmental benefits. These trends collectively point to a safer, smarter, and more sustainable infrastructure future.

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  • 02/12/2024

    FEATURE| Main Shipping Routes for International Logistics Transportation

    The routes of maritime transport are distributed between the oceans, which is also the advantage of maritime transport over other modes of transport. When choosing a route, the conditions of the cargo, ships, and ports must be considered, and a comprehensive assessment of the system organization must be made before a reasonable choice can be made.

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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

  • 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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