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CGL - 連続溶融亜鉛めっきライン

CGL - 連続溶融亜鉛めっきライン
連続溶融亜鉛めっきライン（CGL）の目的は、耐食性を改善するために鋼帯の表面に亜鉛または亜鉛/アルミニウムのコーティングを施すことです。

ガルバニングは任意に、コーティングを鋼製基材に合金化するために行われます。これには、ガルバニールセクションの出口での正確な温度監視が必要です。

AMETEK ランドは、70年以上にわたり高品質で信頼性の高い温度測定ソリューションを鉄鋼産業に提供してきました。当社の専門機器にはガルバニールストリップ温度計（GST）が含まれており、ガルバニールプロセスにおける放射率を急速に変化させるために特別に設計されています。
 

  • Frequently Asked Questions +


    Question Answer 
    What is a CGL? A CGL (Continuous Galvanizing Line) is a high-speed production line that applies a protective zinc coating to steel strip by continuously running it through cleaning, heat treatment, a molten zinc bath and finishing operations. CGLs can process strip at speeds exceeding 180 meters per minute and produce millions of tonnes of galvanized steel annually for automotive body panels, appliances, construction materials and other corrosion-critical applications.
    What does CGL stand for? CGL stands for Continuous Galvanizing Line, distinguishing it from batch hot-dip galvanizing processes. The 'continuous' aspect is fundamental—strip is welded end-to-end and processed as an uninterrupted ribbon through all stages, maximizing throughput and coating consistency. This contrasts with batch processes where individual pieces are dipped separately. Major steel producers operate dozens of CGLs globally to meet automotive and construction demand for corrosion-protected steel.
    What are the main CGL steps? A CGL follows a precise sequence: Entry (uncoiler, welder), Cleaning (alkaline cleaning, brushing, rinsing to remove oils), Annealing (heating to ~700-850°C in controlled atmosphere to prepare metallurgy), Zinc Pot (immersion in molten zinc at ~460°C), Gas Wiping (air knives control coating thickness), Cooling, Skin Pass Mill (improves surface finish and mechanical properties), Inspection (surface quality verification) and Exit (coiler). Each stage requires tight process control for quality output.
    Why is temperature control critical? Temperature is the critical control variable throughout a CGL. In the annealing section, precise heating determines steel recrystallization and formability. At the zinc pot, strip temperature affects how zinc wets and bonds to the steel surface—too cold causes poor adhesion, too hot leads to excess intermetallic growth. Deviations of even ±10°C can cause coating defects, surface quality issues and customer rejections. This is why accurate non-contact temperature measurement is essential for CGL yield and quality.
    How do pyrometers help? LAND pyrometers provide accurate strip temperature measurement at critical CGL zones. The SPOT+ GS is optimized for galvanized strip measurement after coating, while the SPOT+ measures bare strip in annealing sections. The SPOT+ MM (Meltmaster) can monitor zinc pot temperature. These instruments deliver the real-time temperature data that process engineers need to maintain coating consistency, optimize line speed and reduce scrap—helping CGL operators achieve first-time quality rates that meet demanding automotive specifications.

  • 用途 +

  • 動画 +

    • SPOT GS - 亜鉛メッキおよび亜鉛メッキストリップの温度測定
      https://youtu.be/leNO8JclWsg

      SPOT GSにより、自動化された炉管理で反応と反応ゾーンの位置を厳密に管理し、製品品質をより厳密に管理できます。 反応ゾーンの制御を維持することによって、ＳＰＯＴ ＧＳは、基材またはコーティング重量の変化に伴うライン速度および炉出力の急速な変化に対応する。 これにより炉の最適化が可能になります。 加熱コストを削減し、スループットを最大化し、その後の成形作業中のコーティングの過度の過剰反応および粉末化または剥離を回避します。

  • ドキュメンテーション +