POSCO, South Korea

World’s first continuous tandem cold mill (CTCM) in 18-HS design

Ever since 2009, POSCO has been operating a 4-stand CTCM supplied by SMS group. It was the world's first tandem mill to have all stands equipped with 18-HS roll sets. POSCO uses the CTCM to produce AISI 300 and 400 series stainless steel strip. High reductions per rolling pass ensure extremely cost-effective production of 500,000 tons per year.

Right from the get-go, our customer was fully satisfied with the CTCM. It's a major advantage that the mill can process a second run with hard material. Work-roll changing takes less than two minutes per roll set. A further highlight is the continuous paper feed in the exit section. This is a carousel-type automatic paper dispenser that eliminates the need to interrupt the process for wrapping. Our customer is also delighted with the Rotary Inspect inline inspection system. Here are some more state-of-the-art technological features that ensure excellent strip quality:

  • Servohydraulic roll-gap control (AGC)
  • HS shifting for the work rolls
  • Intermediate roll shifting and bending
  • Mathematical model for presetting all rolling parameters
  • Thickness control
  • SUPAFINE filtration system for cooling and ultrafine filtering of the rolling oil

Main technical data

MaterialsAISI 300 and AISI 400 series
Strip width600 - 1,350 mm
Strip thickness5.5 - 0.4 mm
Rolling speedMax. 400 m/min.
Capacity500,000 tpy
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Entry area looper for continuous strip supply

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