Babban abin ƙyama da sannu da kyau sosai gunagara galibi ana yin su ne da ƙarfe Ingot, wanda za'a iya kasu kashi mai yawa bisa ga ƙayyadaddun ƙarfe na ƙarfe. Gabaɗaya da taro ya fi 2T ~ 2.5t, diamita ya fi girma 500mt ~ 550mm Ingot da ake kira Babban Karin Magot, wasu kaɗan ne kadan.

Latsa Matar don Ingantawa Karshe da aka yi amfani da shi kafin zafin jiki na dafa wutar tashe-tashena) da zazzabi mai zafi (gabaɗaya ta fi ƙarfin zafi a ƙasa, kuma an kafa ta Aneot a cikin tsari na lu'ulu'u da tsarin damuwa da zazzabi zai haifar da maida hankali, idan ƙudurin dumama, mai sauƙi don crack. Saboda haka, a cikin ƙarancin zafin jiki na Ingant mai narkewa, zazzabi mai ɗorewa kuma ya kamata ya iyakance.
Marka da dumama mai girma mai yawa tare da ƙayyadadden bugun jini, saboda tsakiyar tashin hankali yana da girma sosai, to, matsanancin zafin jiki na zazzabi yana da sauƙin fashewa lokacin da dumama, saboda haka, Za'a iya yin zafin wutar lantarki na wutar lantarki ba zai iya zama da yawa ba, saurin dumama ya kamata a za'ayi a hankali. Misali, don carbon tsarin karfe da Alliy clect/hercid, da zazzabi na wutar lantarki gabaɗaya ne 350 ℃, girman girman karot yana da girma, kuma rufin karfi. Ga siloy karfe, kamar babban saurin ƙarfe, babban ƙarfe Chromium yana da sauƙi don crack lokacin da ya kamata a sarrafa zazzabi a 400 ℃. Lokacin da zazzabi ya fi 850 ℃, za a iya mai zafi a cikin sauri sauri, amma ba da sauri, don guje wa abin da ya faru na cirewa da waje da bambancin zafin jiki ya yi yawa. Misali, ka mara da tsarin ƙarfe mai ɗorewa da Alloy tsarin ƙarfe ba da izinin bambancin zafin jiki tsakanin 50 ℃ da 100 ℃.
A lokacin da dumama kananan karfe, saboda karamin girman saiti, tashin hankali damuwa da damuwa na zazzabi na iya zama babba, da kuma saurin carbon na carbon na carbon, wani sashi na m Ana amfani da ƙayyadadden dumama a cikin mantawa. Don kananan ƙananan girman karfe, saboda ƙarancin yanayin zafin jiki mara kyau ne, kuma babban dulasen Ingot na da a 700 ℃ 1000 ℃ zazzabi tfita.
Domin rage lokacin dumama kuma adana mai, babban kara daga wurin bita na karfe bayan tsintsiya, da kai tsaye aika zuwa ga mashin meerce dumama, wannan nau'in erote erote dumama, wannan nau'in erote erote dumama. A lokacin da zafi mai tsananin zafi caji, saman zazzabi na 550 ℃, saboda yawan zafin jiki na iya zama, don haka zafin tande girman da kayan ya bambanta, iya Kasance cikin yau da kullun 800 ℃ ~ 1000 ℃ ℃ terna, Karancin Ingant tnerce na iya zama mara iyaka, bayan caji na iya zama ɗaya daga cikin tsananin dumama mai girma.