Stappen blast oxygen furnace (BOF) staal productie
1. ijzererts tot pellets bakken cokes uit steenkool cokes en pellets in hoogoven:
ruwijzer (veel koolstof) en slakken
2. ruwijzer + veel zuurstof verhitten oud ijzer toevoegen voor koeling (staal in plakken,
slakken) gieten in plakken
Stappen electric arc furnace (EAF) staal productie
- schoot in oven lans laat smelten vluchtige stoffen ontsnappen eindproduct
aftappen
plaatstaal
nabehandeling verpakkingsstaal
Tin: hot dipping / elektrodepositie
Chroom: elektrodepositie
Coating: ETP = electrolytic tinplate / ECCS = electrolytically chromium coated steel
Eigenschappen coating
Tin:
- sterkte
- corrosie preventie
- visueel effect
- goed te solderen, lakken, bedrukken
Chroom:
- hittebestendiger
- corrosie preventie
- hechting voor lak of inkt
- bescherming tegen zwavel (in voedsel)
- visueel effect
- kan niet worden gesoldeerd
Erosie
- oplossing tin laag (zure producten)
- aantasting ijzer (corrosie)
Sterk corrosief = appel- en citrussappen
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