Rolling Process

In the rolling process, the Square Billets are reheated and processed to the desired standards and shapes that suit best for customers. Currently, Daehan Steel generates1.55 million tons of steel products including 1.10 million tons of deformedsp bars and 450,000 tons of bars in coil on an annual basis.

STEP 1Reheat Furnace
Reheating of room temperature Square Billets Reheating of room temperature Square Billets

In the reheat furnace, the Square Billets at room temperature of 20 to 30 °C transferred from the steelmaking process are reheated to up to 1,050 to 1,150 °C so that they become soft enough to be lengthened to the desired thickness and length. Daehan Steel established a hot charge line to reduce costs, and its Sinpyeong Factory adopted a walking beam furnace in which the Square Billets can be heated on four sides, leading to increasing efficiency.

STEP 2Rolling
Square Billets passing though stands Square Billets passing though stands

The Square Billets extracted from the reheat furnace is passed through about 22 stands comprising of roughing stands, intermediate stands and finishing stands to form shapes of steel bars. With a 6-meter Square Billet, an up to 1.4-kilometer long, 10-milimeter wide rebar is manufactured. Daehan Steel has made a continuous effort for technological development and facility investment to produce high-quality steel bars.

STEP 3-ACooling Bed
(Ordinary Rebar)
Walking beam type cooling bed system Walking beam type cooling bed system

On the cooling bed, the Square Billets passed through the rolling mill are cooled down. The walking beam cooling bed system allows them to cool down by air flow created on all sides and move to the sawing machine.

STEP 3-BCoiling
(Bar in Coil)
Coiling of bar in coil with VCC Coiling of bar in coil with VCC

In this process, the vertical compact coiler (VCC) produces compact coils of the rolled steel.

STEP 4Sawing
(Ordinary Rebar)
Shearing of ordinary rebars Shearing of ordinary rebars

After the stringent quality test, the products transported from the cooling bed are cut to the lengths desired by customers and packed by bundle through an automated machine. The packed products go through the identification process in which rebars are color coded according to their specific grade and are sent to end users.

STEP 5Inspection and Packaging
Coiled rebars Coiled rebars

The coiled rebars are bent after going through a rigorous quality test and a variety of inspections and are sent to customers with a product tag attached.