Sizzling heat is not shown in the chart at left. The metal stiffens as it cools down and cannot be worked as easily when it cools to lower temperatures. A good rule of thumb for most shaping of mild steel and wrought iron is to work it when heated yellow, and put it back in the fire when it cools to red.
UIO redirects here. For other uses, see UIO (disambiguation). Mariscal Sucre International Airport (Spanish: Aeropuerto Internacional Mariscal Sucre) (IATA: UIO, ICAO: SEQM) is the busiest airport in Ecuador and one of the busiest airports in South America.
Incheon International Airport (IIA) (IATA: ICN, ICAO: RKSI) is the largest airport in South Korea, the primary airport serving the Seoul National Capital Area, and one of the largest and busiest airports in the world.or seven years in a row (2005âpresent), it was rated the best airport worldwide by Airports Council International. Located 48 km (30 mi) west of Seoul, the capital and largest city of South Korea, Incheon International Airport is the main hub for Korean Air, Asiana Airlines, Jeju Air, and Polar Air Cargo.