Select the different stages to view the upstream process.

Metal waste handling

Metal waste handling

As the largest metal recycler in Singapore, NatSteel Recycling processes more than half a million tonnes of locally generated metal waste into radiation-free, quality steel annually.

Metal waste handling

Dedicated fleet of collection trucks and bins

Radiation detection system

Metal waste segregation and processing



Collection of metal waste

Collection of metal waste

Metal waste is collected from marine, demolition and construction industries with a dedicated fleet of collection bins and trucks.

These bins and trucks now come with improved safety and environmental features.

Collection of metal waste

Reinforced bin door locking latch

Reinforced bin to truck frame



Radiation detection and weighing

Radiation detection and weighing

Incoming metal waste is first screened for radiation and weighed before unloading.

A Radiation detection panels
B Weighing bridge

Drum shearing process

Drum shearing process

Metal waste is segregated and further processed by various cutting methods to sizes optimal for melting.

A Metal waste charging in
B Drum shearing and magnetic sorter
C Processed metal waste
D Ferrous & non-ferrous secondary sorter
E Non-ferrous material

Steel making

Steel making


Meltshop & Furnace

NatSteel has one of the most energy-efficient operations in the world. Typical steel mills operate electric are furnaces using about 400 to 450 kilowatt hours of energy to produce a tonne of steel. NatSteel does the same with about 30% less energy at 300 kilowatt hours.

Meltshop & Furnace

Melting process


Processed metal waste is melted in the electric arc furnace with fuel oil burners and high voltage current, enriched by oxygen jetting. During this melting process, slag and dust is generated.

Chemistry refinement and temperature control


Molten steel is transferred to the 80-tonne Ladle Furnace for chemistry refinement and temperature control.

Continuous casting


Refined moleten steel flows to this machine with a 4-strand high speed caster. Billets are cast from it and are directly hot charged to the rolling mill, resulting in fuel oil savings.



NatSteel also minimises waste by utilising by-products more efficiently

Steel slag is recycled into road aggregate which has better quality than natural granite and widely used in Singapore' public roads.

This is estimated to save about 860,000m³ of landfill site in Singapore, if the steel slag was to be disposed as waste.

minimises waste

Collection of slag from steelmaking plant

Cooled and crushed steel bag

Road surface with steel slag replacing granite



Slag and dust are generated in the steel recycling process and often dumped into landfill as a cheaper alternative to recycling

minimises waste
State-of-the-Art FE Bag House for Dust Collection

Steel mill dust contains mainly volatile zinc oxide fines.

In NatSteel, we work with an external technical partner to recycle our steel mill dust into zinc ingots in overseas zinc smelters.

Merchant Bar Mill

At the Merchant Bar Mill, billets are rolled into reinforcement bars and wire rods through an automated process.

Metal waste recycling process

Sequence of roll stand to gradually reduce billets to required sizes

Fully automated, water cooled roll stands




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