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The pickled and oiled coil is now moved to the cold rolling mill. Some of the steel is rolled on the six high reversing stand to its final thickness ready for the metal coating line. Other steel is annealed and rolled to achieve the required mechanical properties.

New Zealand Steel's metal coating line produces both ZINCALUME® and galvanised steel. Cold rolled strip is delivered from the cold rolling mills to the metal coating line. The strip is cleaned to remove grease, oil and iron oxide before traveling through the annealing furnace (with a hydrogen and nitrogen atmosphere) to anneal or stress relieve to the specified strength. The strip travels into the molten metal through the "snout", where it emerges below the surface of the metal. The strip travels vertically from the pot, passing through air knives which control the coating thickness. The coating is cooled and moved through the skin pass to flatten the metallic coating on the strip. To protect the surface from oxidation, a passivation solution is applied. The strip is then branded and wound, ready for packing.

New Zealand Steel's colour coating line produces COLORSTEEL® for roofing and cladding applications. Metal coated coils are delivered to the colour coating mill for further processing where they first undergo a pre-treatment before painting begins. Once the pre-treatment has been applied a prime coating is applied to both sides of the strip and baked on in the prime oven. This process is then repeated with the application of the finish coating. The strip is then branded and wound, ready for delivery to customers.

Up to 1.2 million tonnes of sand is mined each year at the Waikato North Head mine. The deposit contains more than 150 million tonnes of ironsand.

Ironmaking and steelmaking activities are excellent examples of chemical processes taken beyond the textbooks and laboratory and implemented in industry on a grand scale. The New Zealand Steel plant at Glenbrook is unusual in that the huge blast furnaces that dominate the processes at most steel works around the world are not present. This has eventuated because of the nature of the ore mined locally and used in the process. Early pioneering experiments failed to successfully smelt iron from New…

The Origin of ScaleDuring slab reheating and hot rolling, oxides form on the surface of the steel. During hot rolling there are three forms of rolled in scale that are not normally removed during pickling.

Primary or Furnace Scale: This scale forms on the slab in the reheat furnace by reaction between the surface of the steel with combustion gasses that include excess air, water vapour and carbon dioxide. Extended time in reheat furnaces due to delays contribute to abnormally thick scale layers…

The Acid Regeneration Plant ReactorReactor ContructionA reactor is a vessel where a controlled chemical reaction can take place. The acid regeneration plant reactor is a vertical cylindrical mild steel shell with a coned bottom and shallow dished roof. The reactor vessel is 14 metres high and 3 metres wide. The sides and bottom are refractory lined due to the high temperatures reached inside the reactor. Burners are mounted tangentially to create a vortex.

 

Chemical Reaction Inside the Reacto…

New Zealand Steel and it's employees are proud to be supporting the community.

These are some of the projects that we have supported through community sponsorships. While sponsorship is the largest area of financial assistance we provide for the community, we also make donations to a range of causes including schools, community special events and charitable organisations.

New Zealand Steel has guidelines and criteria in place for community donations and sponsorships to ensure quality and transparency in the way that we support community organisations.

Applications are considered by the Company's Donations & Sponsorships Committee for approval.

> Contact us if you would like to apply.