Page 36 - Steel Metallurgy eMagazine Volume June 2024

C O M P A N Y NEWS

LONG-PRODUCT TECHNOLOGIES

HIGHLIGHTED AT DIM 2024

MIDA QLP-DUE minimills and to a conventional process are achieved. crop wirerod heads and tails at record
speeds –up to 135.4 m/s for dia. 5.5
sixth-generation billet welders for Endless rolling is possible also by the mm, automatically. The in-line ther-
endless rolling, bar spooling up to 8 installation of billet welders upstream momechanical rolling ensures superior
tonnes, benchmark wirerod and SBQ rolling mills. metallurgical and mechanical properties,
mills, RH2 and QST quenching sys- improving steel strength, toughness and
tems.
The combination of sixth-generation ductility, and high repeatability, meaning
Danieli billet welders with bar spooling -20% product complaints.
for coils up to 8 tonnes raises the level of
he long-products session of Day torsion-free, quality bar production. Winning on odd-roll configurations for
2 at the Fifth Danieli Innovaction accuracy and flexibility, the “Drawer”
TMeeting could not open with any Endless welding rolling process –welding –Danieli four-roll technology sets new
topic other than Danieli MIDA QLP- heads and tails of the billets feeding the standards for SBQ bars production.
DUE minimills, which ensure the most mill – increases plant productivity up to
competitive and green production of 12% and improves material yield. Latest, By operating the innovative Drawer, SBQ
long products – rebar in bundles and sixth-generation Danieli Horizontal producers forge the core of the bar and
spooled coils, wirerod, and now also Billet Welders -HBW drastically decrease draw its surface, applying the specific
merchant bars – in any condition. cleaning and maintenance downtime rolling sequence – oval, rounded-square,
due to a new design that consequently pre-round, and round. Combining high-
Covered by numerous Danieli patents, increases production time. reduction and sizing on the bar and with
MIDA QLP-DUE minimills incorporate the 4-roll modules in sequence, means
Digimelter and Octo-caster, empowering Danieli spooling process is well proven that the spread of the rolled product is
stable and consistent endless casting- for twist-free bar winding high-quality “zero”. During the meeting at the Danieli
rolling – and more proprietary production of ultra-compact customized Research Center, industrial machine
technologies for thermomechanical coils. When paired with HBW it allows “Drawer Evo”, the new, superior-quality
rolling, direct bundling and spooling. savings in downstream operations up to bar sizing block for operating in free-
24 USD/tonne. sizing mode for a wide range of bar
Octo-caster mould technology allows diameters, was exhibited.
billet casting operation at speeds up to Danieli mills are characterized by the
10 m/min, producing from 200,000 tpy “any size, any grade, at any time” concept Consistent, high-quality in-line head-
to 1 Mtpy with a single strand. A steady, for maximum flexibility in steel grades, hardened rails up to 420 HB at the
smooth and reliable endless production rolling strategies, and quick size changes, lowest transformation costs are achieved
guarantees plant uptime exceeding including small orders. by using the Danieli RH2 in-line Rail
90%, along with an excellent yield from Head-Hardening proprietary quenching
liquid steel to finished product reaching Product diameters range from 4.5 to 28 system.
99% when selling bars by weight, and mm, and thanks to high-speed rolling
exceeding 103% when selling bars by +15% productivity for small sizes is Danieli RH2 is energy-saving since no
number. achieved, compared to traditional air blowers are used for quenching (45%
equipment. Everything that is required lower production cost) and no additional
MIDA QLP-DUE is a true technology to change a section is fully automatic heating devices are required for head/
revolution in competitive, green and automated. Only four to 15 minutes tail temperature equalization (35%
steelmaking for long products. 26 million are required to change the entire mill, lower power consumption compared to
tonnes of bar and wirerod have been performing according to the “zero- running through systems).
produced worldwide by MIDA QLP- man on the floor” principle. Patented
DUE technology, saving 5 billion kg of TMB guarantees ±0.10 mm with ≤60% The most recent RH2 rail-hardening
CO2 emissions per year because there is ovality over the entire product mix. system is in operation at ArcelorMittal
no gas-reheating. Optimal tension control rolling, as well Poland in Dabrowa Górnicza. With
as reduced inventory and consumption rail lengths up to 128 m, linear weights
Up to 48 USD/tonne savings as compared of rolling rings are ensured. HSS shears between 45 and 68 kg/m, and hardness

32 STEEL & METALLURGY JUNE 2024