Machining Materials Guide. Moderate strength and low-stress applications. Plain low carbon steel, poor machinability but good formability and weldability. Case harden only. Strength, impact resistance and higher tensile strength. Designed for excellent machinability. Case hard only. Designed for Steel Production in South Korea increased to 6100 Thousand Tonnes in July from 6000 Thousand Tonnes in June of 2021. Steel Production in South Korea averaged 3521.03 Thousand Tonnes from 1980 until 2021, reaching an all time high of 6405.68 Thousand Tonnes in March of 2014 and a record low of 650 Thousand Tonnes in February of 1980. This page has Steel Production values for South Korea.