Page 32 - Steel Tech India eMagazine Volume April 2022

VOL. 16 • NO. 3 • April 2022

TSCR TECHNOLOGIES FOR HRC PRODUCTION continuous and uninterrupted casting and rolling
process.
cSP®or the compact Strip Plant technology was
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developed, patented and implemented in twenty Now let us look into these technologies – CSP , QSP
eight plants worldwide by SMS Siemag, Germany. and Arvedi eSP.
QSP or Quality Strip Production technology was cSP is a compact plant concept comprising a two or
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developed and implemented by Danieli & c. Italy for single strand castingmachine, a roller-hearth furnace
about sixteen plants. JP Steel Plantech co. (SPcO), or tunnel furnace (160 to 220 meters long) and a 6 or
Japan implemented one QSP plant in thailandand this 7 stand rolling mill train. thinslabs, 55-90mm thick,
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planthas a coil Box before the Finishing Mill Stands. are cast and fed directly to thecSP rolling mill after
temperature equalization in theroller-hearth furnace
the Arvedi eSP (endless Strip Production) was (tunnel Furnace) and then rolled to the finished
developed and implemented by Siemens VAI Austria stripgauge (see Figure 1).this roller-hearth furnace is
(now Primetals) with Acciaieria Arvedi SpA, Italy. this also used as a buffer for storing the slabs during roll
Arvedi eSP produces hot rolled strip in a combined, changes in the mill stands.

Fig.1: Schematic Diagram for a Compact Strip Plant or CSP ®

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the compact cSP process makes it possible to are 3 more plants are under operation– these are at
produce hot strip with a homogeneous microstructure Bhushan Steel & Power (now JSW Steel), essar Steel
and constant mechanical and physical properties (now ArcelorMittal Nippon Steel India) and Tata Steel
over the entire lengthand width of the strip. Additional (Jamshedpur).Out of these plants, the cSP at essar
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features are the close tolerances with regard to gauge, Steel is for production of 3.5mtpy hRc with three
width, profile, contour and flatness. these can be casting strands.
achieved by the homogeneous temperature distribution to enhance the flexibility of operation and enlarge
in the thin slab and to the low temperature losses product portfolio for cSP technology SMS Siemag
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between the roller hearth furnace and the rolling mill. Germany have also developed a new variant of cSP
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these conditions result in an extremely stable rolling and namedit cSP Nexus which is quite similar to
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process at constant rolling speeds and temperatures.
Danieli QSP. One such CSP Nexus plant has been
the first cSP in India was installed in Ispat Dolvi (now installed in Steel Dynamics Inc. Buffalo plant in texus,
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JSW Ispat Dolvi Works) in 1998 and presently there USA.

Fig. 2: Schematic Diagram for a CSP Nexus
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30 Steel tech