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ورق سیاه

  • July 21, 2020 12:35 AM PDT

    ورق سیاه
    فولاد کاویان اهواز
    نورد گرم یکی از روش های تولید ورق های فلزی با ضخامت کم می باشد که به ورق تولیدی توسط این روش در نهایت ورق نورد گرم یا اصطلاحا ورق سیاه گفته می شود. علت استفاده از اصطلاح ورق سیاه برای محصول تولیدی با این روش این است که به دلیل ذوب
    اجزای تشکیل دهنده ورق در دمای بالا رنگ محصول مات می گردد و به همین دلیل از اصطلاح ورق سیاه برای نامگذاری استفاده گردیده است.

    مراحل تولید ورق سیاه :
    در این روش ابتدا تختال تولید شده در کوره پیش گرم با دمای بالا قرار می گیرد پس از خروج تختال از کوره پیش گرم یک پوسته اکسیدی روی سطح تختال تشکیل می شود . به منظور برطرف ساختن این پوسته اکسیدی ، عملیات پوسته شویی انجام گرفته که تاثیر
    زیادی بر افت دمای سطح تختال دارد. نورد خشن مرحله بعد از پوسته شویی است .

    ورق کرکره ای سقف
    در این مرحله قطعه کار چندین مرتبه از بین غلتک ها عبور می کند تا به تدریج به ابعاد مورد نظر برسد. در طی این فرایند توزیع دمای بار تحت تاثیر چند عامل از جمله انتقال حرارت به محیط و گرمای ناشی از تغییر شکل پلاستیک قرار می گیرد و ضخامت تختال 15
    تا 30 % کاهش می یابد. نورد خشن دارای 2 تا 3 قفسه است . پس از آخرین قفسه نورد خشن ، ورق وارد مرحله نورد نهایی می گردد.


    تولید ورق سیاه
    تولید گندله (pellet) به وسیله فرآوری سنگ‌آهن و تبدیل آن به آهن اسفنجی: سنگ‌آهن به همراه ناخالصی‌های خود به گلوله‌‌هایی به نام گندله تبدیل و پخته می‌شود، گندله طی فرآیند احیای مستقیم در واکنش با کربن، آهن خالص را حاصل می‌کند و چون اکسیژن خود
    را از دست می‌دهد، حالت اسفنجی به خود گرفته و به آن آهن‌اسفنجی نیز می‌گویند که در مراحل بعد استفاده می‌شود.
    قیمت ورق رنگی در مشهد

    تولید فولاد مذاب: آهن‌اسفنجی در این مرحله درون کوره قوس الکتریکی قرار می‌گیرد تا به فولاد مذاب تبدیل شود. گرید ورق آهنی با توجه به ترکیب عناصر شیمیایی که در این مرحله بعد از سرباره‌گیری اضافه می‌شود، تعیین می‌گردد و برای داشتن ترکیب یکنواخت به
    آن گاز دمیده می‌شود.


    تولید تختال (slab): در این مرحله فولاد مذاب بعد از تصفیه به وسیله پاتیل درون ماشین ریخته‌گری سرازیر می‌شود و این ماشین قالبی دارد که به شکل نوار مستطیلی است و مذاب با قرار گرفتن درون این قالب به شکل آن درآمده و به وسیله جریان آب خنک
    می‌شود. در این مرحله نوارهای مستطیلی با ضخامت ۲۰ سانتی‌متر خارج می‌شود که همان تختال‌های مورد نظر است.
    ورق طرح سفال
    نورد گرم: در این مرحله تختال داخل کوره پیش‌گرم با دمای 1200 درجه سانتی‌گراد قرار گرفته و شکل‌پذیر می‌گردد؛ سپس نورد خشن و نورد بیشتر برای گرفتن ضخامت موردنظر با عبور از غلتک انجام شده و نتیجه آن ورق سیاه است که به دو صورت کلاف یا با
    استفاده از دستگاه‌های برش به صورت صفحات با ابعاد مشخص به عنوان ورق سیاه برش خورده خارج می‌شود.


    جمع‌بندی
    ورق گالوانیزه کاشان
    با توجه به صحبت‌هایی که انجام شد، کسانی که مایل به استفاده و کسب اطلاعات در مورد ورق سیاه هستند، باید ببینند که چه کاربردی مدنظر آن‌هاست و بعد عوامل مختلف را در نظر بگیرند. به‌طور مثال برای کاربرد‌های با ظرافت و کیفیت بالا ممکن است‌ حتی ورق
    روغنی مناسب‌تر باشد؛ چون تولید ورق گرم در دمای بالاتر و در نتیجه با دقت کمتری برای کیفیت و ضخامت (پارامتر مهم تعیین‌کننده قیمت آن) انجام می‌شود و جدای آن بحث درصد عناصر به کار رفته در فولاد برای تعیین خواصی مثل سختی نیز مطرح است.
    امیدواریم این مقاله برای کسب اطلاعات در این زمینه مفید بوده باشد.

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    July 26, 2020 9:19 PM PDT

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