Нихром или Фехраль

В этой статье мы не будем говорить о расчетах и химическом составе этих материалов, их можно посмотреть в разделе Справочник и перейдем сразу к делу.

Многие покупатели задают вопрос!

А можно ли, сэкономить и поставить фехраль х23ю5т вместо нихрома х20н80? Ведь фехраль  дешевле в разы!

Можно! Если правильно рассчитать нагреватель и учесть некоторые физические особенности проволоки фехраль х23ю5т.

Первый существенный недостаток фехрали — это большой коэффициент удлинения, в печи при нагреве это выражено провисанием и всяческой деформацией спирали, что приводит к замыканию витков, «выпучивание» спирали из полки печи, что в дальнейшем приводит к механическим повреждениям спирали и их перегрева в местах соприкосновения витков. У проволоки нихром х20н80 деформация незначительная, даже при случайном постороннем воздействии спираль на холодную, можно засунуть обратно в полку или согнуть и поставить на место, что для фехрали х23ю5т противопоказанно! Если после нагрева пытаться согнуть холодную спираль фехрали — она лопнет как стекло.

 Фехраль х23ю5т в печи можно деформировать только в нагретом до красна состоянии (мы используем сварочный аппарат  для нагрева небольшого куска нагревателя).

Этот недостаток можно избежать посадкой нагревателя, а именно спирали на огнеупорную керамическую трубку, возможно при таком изменении конструкции, печь придётся перестроить заново!

Навивка спирали Нихром х20н80 происходит на холодную! А вот Фехраль х23ю5т навивают при нагреве (температурный режим разный, его тоже можно посмотреть в Справочнике) для того что бы избежать при навивке микротрещин, которые непосредственно влияют на электрическое сопротивление и срок службы нагревателя.

А все по тому, что основой в составе сплава нихром х20н80 является никель, он придает металлу не только коррозийную стойкость, но и пластичность!

У сплава Фехраль х23ю5т никель отсутствует, небольшую прочность сплаву придает наличие титана.

Необходимо уделить особое внимание европейским производителям проволок, таких как: Kanthal и другие их конкуренты, их проволоку можно при навивке  не греть. Они существенно уменьшили коэффициент удлинения и в целом живучесть материала выше чем у Китайских и Российских аналогов.

Как получилось добиться таких результатов при практически идентичном химическом составе?

Все дело в технологии изготовления сплава и методах обработки материалов.

Теперь перейдем к плюсам сплав Фехраль х23ю5т:

Температура!

Никакой Нихром не может работать при 1400 градусов. Кстати, для разных диаметров проволоки, разные температурные режимы. 

Цена!

Сплав Фехраль х23ю5т — почти в четыре раза дешевле Нихрома!

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