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The steelmaking process is a crucial process that determines the quality of specialty steel products and consists of the melting, refining, and casting process.
Melting facilities include 100-ton/60-ton electric arc furnaces and VIM (Vacuum Induction Melting) for ultra-clean manufacturing.
For the refining process, secondary refining processes such as LF, VD, VOD and AOD are available and ultra-clean, high-functioning parts materials are manufactured by the ESR process which is a special refining technique.
The casting process is divided into continuous casting and ingot casting, allowing the production of semi-finished items such as billets, blooms, and ingots.
Billets are manufactured in curved continuous caster and the largest-section blooms in the world are manufactured for the production of high-quality, ultra-clean steel.
We are also able to manufacture ingots weighing from 4 tons up to 150 tons, depending on specific customer demand.

In the forging process, steel ingots are heated and forged into various shapes such as marine shafts, engine parts, plant shells and discs, bars, and plates.
forging, forgings are heat treated to meet the mechanical requirements. Visual inspection, UT (ultrasonic testing), and witness inspection by third parties are performed for quality assurance of the products.

SeAH Changwon Integrated Special Steel produces wire rods and round bars with outstanding quality through the continuous rolling process consisting of the roughing mill, intermediate mill, and finishing mill. The 3-roll based kocks mill ensures consistent surface and core rolling.
cutting-edge RSM (reducing and sizing mill) enables homogeneous micro structures and less-than-0.1mm accurate dimension control via high-speed precision rolling.
cutting-edge DST (direct solution treatment) technique ensures consistent control of grain size and strength.
The nitric acid-free acid pickling process, a state-of-the-art eco-friendly pickling technique, allows us to produce stainless steel wire rods with top surface quality.

Flat bars and round bars are manufactured via forging and blooming or large section rolling processes.
The newest SBM block mill is able to produce large section rolling bars and wide range flat bars.
HV-Mill allows the production of flat bars and round bars of precise dimension, based on our horizontal-vertical continuous rolling techniques.

The manufacturing of seamless tubes and pipes is started by cutting peeled round bars in the band sawing machine into designed lengths based on product size. After then, bars are moved to the boring machine to make a center hole for extrusion. After boring, the bars are heated in the induction heater, and extruded by a 2000 ton press into designed sizes of tubes and pipes.
tubes and pipes are heat treated, straightened and pickled to become hot finished products, while additional pilgering or heat treating and pickling is added to produce excellent cold finished products with high size precision.
piece of product is inspected by an in-line nondestructive testing machine to ensure the internal and surface quality, and provided to customers as products with perfect quality.

SeAH CSS