Menene Electropolished (EP) Bakin Karfe Sumul Tube

1. Zaɓin Kayan Kaya 

Billet ɗin bakin karfe masu inganci (sandunan bakin karfe masu ƙarfi) an zaɓi su bisa tsarin sinadaran su. Maki na gama gari don bakin karfe mara nauyitubes sun hada da 304, 316, da sauransugami da kyakkyawan juriya na lalata.

Billet ɗin dole ne su cika ƙayyadaddun ƙa'idodi don tabbatar da cewa sun mallaki kayan aikin injiniya da ake buƙata da juriya ga lalata don aikace-aikace a masana'antukamar magunguna, abincisarrafawa, da lantarki. 

2. Huda ko Fitarwa

Billet ɗin bakin karfe ana fara zafi da zafi sosai, yana mai da su matsi. Daga nan ana huda billet ɗin a tsakiya ta amfani da injin niƙa don ƙirƙirar bututu mai zurfi.

Ana tura maɗaukaki (tsawon sanda) ta tsakiyar billet, ƙirƙirar rami na farko, wanda ya zama farkon bututu maras kyau.
 
Extrusion: Ramin billet ana turawa ta cikin mutuwa a ƙarƙashin babban matsi, yana haifar da bututu maras kyau tare da girman da ake so.

3. Hajji

Bayan huda, bututun yana ƙara elongated da siffa ta ko dai extrusion ko pilgering:

Pilgering: Ana amfani da jeri na mutu da rollers don rage diamita na bututun a hankali da kaurin bango, tare da tsawaita shi. Wannan tsari yana ƙara daidaiton bututu a cikin sharuddandiamita, kaurin bango, da ƙarewar farfajiya.

4. Zane Mai sanyi

Daga nan sai a bi da bututun ta hanyar zane mai sanyi, wanda ya hada da jan bututun ta wani mutu don rage diamita da kaurin bango yayin da yake kara tsayi.

Wannan matakin yana inganta daidaiton girman bututun da ƙarewar saman, yana mai da shi santsi kuma ya fi daidai girman girman.

5. Annealing

Bayan tsarin zane mai sanyi, bututu yana mai zafi a cikin tanderun yanayi mai sarrafawa don annealing, wanda ke sauƙaƙe damuwa na ciki, yana sassauta kayan, kuma yana inganta ductility.

Sau da yawa ana toshe bututun a cikin yanayin da ba shi da iskar oxygen (gas mara amfani ko hydrogen) don guje wa oxidation. Wannan yana da mahimmanci saboda oxidation na iya lalata bayyanar bututu da lalatarsajuriya.

6. Electropolishing (EP)

Ana aiwatar da ma'anar mataki na electropolishing a wannan matakin, yawanci bayan tsinkewa da annealing, don ƙara haɓaka saman bututu.

Electropolishing wani tsari ne na electrochemical wanda aka nutsar da bututun a cikin wankan lantarki (yawanci cakuda phosphoric acid da sulfuric acid). Ana ratsa wutar lantarki ta hanyarbayani, haifar da abu don narkewa daga saman bututu a cikin hanyar sarrafawa.