Title

“EWR®” BILLET WELDING AND “SPO” SYSTEMS: COMBINED APPLICATION FOR ENDLESS ROLLING OF SPOOLED BAR IN COILS

“EWR®” BILLET WELDING AND “SPO” SYSTEMS: COMBINED APPLICATION FOR ENDLESS ROLLING OF SPOOLED BAR IN COILS

Authorship

Nigris, G.; Salvador, G.

Nigris, G.

I am this author

Salvador, G.

I am this author

DOI

10.5151/2594-5297-0085

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Abstract

Today, effective solutions are available for increasing productivity and efficiency in rolling mills for long products and for substantial reduction of production costs thereof. Some of the most significant latest Danieli innovations are the EWR® Endless Welding Rolling process and the “Spooler Line” for bar-in-coil production. The EWR® system, through automatic continuous head-to-tail flash welding of billets at reheating furnace exit side, enables uninterrupted production of the mill for endless rolling of straight bars, wire rod and bar in coils. The process is particularly beneficial to wire rod and bar-in-coil mills as it enables production of “customized-size coils” (any coil weight according to specific Customer request) and with extra-high final coil weight, even starting from low-weight billets. The Spooler process is based on twist- free winding of hot-rolled rebars into highly-compact/ultra-heavy coils featuring a unique cobble-free un-coiling capability. This enables high-speed feeding of the downstream cold-processing lines with hot-rolled spooled coils coming directly from the rolling mill without the need of any traditional off-line operation (such as de- coiling, stretching & re-winding). The system results highly beneficial both to bar-in- coil producers and to the downstream lines operators. The latest step forward is the combined application of these two systems that has made it possible for endless rolling of spooled bar in coils, enabling to cumulate the benefits of the two processes, particularly as far as transformation costs are concerned.

Today, effective solutions are available for increasing productivity and efficiency in rolling mills for long products and for substantial reduction of production costs thereof. Some of the most significant latest Danieli innovations are the EWR® Endless Welding Rolling process and the “Spooler Line” for bar-in-coil production. The EWR® system, through automatic continuous head-to-tail flash welding of billets at reheating furnace exit side, enables uninterrupted production of the mill for endless rolling of straight bars, wire rod and bar in coils. The process is particularly beneficial to wire rod and bar-in-coil mills as it enables production of “customized-size coils” (any coil weight according to specific Customer request) and with extra-high final coil weight, even starting from low-weight billets. The Spooler process is based on twist- free winding of hot-rolled rebars into highly-compact/ultra-heavy coils featuring a unique cobble-free un-coiling capability. This enables high-speed feeding of the downstream cold-processing lines with hot-rolled spooled coils coming directly from the rolling mill without the need of any traditional off-line operation (such as de- coiling, stretching & re-winding). The system results highly beneficial both to bar-in- coil producers and to the downstream lines operators. The latest step forward is the combined application of these two systems that has made it possible for endless rolling of spooled bar in coils, enabling to cumulate the benefits of the two processes, particularly as far as transformation costs are concerned.

Keywords

bar-in-coil

bar-in-coil