Flying shear blades are essential components in Thermo-Mechanical Treatment (TMT) lines for steel rebar production, where they enable high-speed, continuous cutting of hot-rolled bars without halting the production line.

Positioned after the finishing mill and before the cooling bed, these blades cut rebars to precise lengths (e.g., 6-12 m for cooling beds or up to 72 m in some setups) while handling temperatures up to 900-1000°C, speeds of 15-20 m/s, and bar diameters of 8-40 mm.

The roll neck is the reduced-diameter section extending from the main barrel, designed to fit into chocks (housings) and accommodate bearings (typically multi-row cylindrical roller bearings).

Necks handle combined radial-axial loads, high-speed rotations, and thermal expansion while maintaining precise alignment to prevent camber or edge defects.

Scalping cutters are specialized milling tools used in metal processing to remove surface defects, such as oxidation scale, cracks, or irregularities, from cast products like slabs, billets, strips, or rods produced in continuous casting lines. In continuous casting (CC) processes—primarily for steel, copper, aluminum, and their alloys—scalping occurs post-casting but pre- or during hot rolling to ensure high-quality surfaces for downstream applications

Scalping cutters are specialized milling tools used in metal processing to remove surface defects, such as oxidation scale, cracks, or irregularities, from cast products like slabs, billets, strips, or rods produced in continuous casting lines. In continuous casting (CC) processes—primarily for steel, copper, aluminum, and their alloys—scalping occurs post-casting but pre- or during hot rolling to ensure high-quality surfaces for downstream applications

The primary bearings used in 20-Hi mills are cluster mill bearings (also called backing bearings). These are multi-row cylindrical roller bearings, typically with 3–6 rows of rollers, designed for the backing assemblies. They provide high load capacity, low friction, and the ability to accommodate axial movements in the roll necks. Unlike single-row bearings, they distribute forces evenly across the mill's width to ensure uniform strip thickness and shape control.

Bearing cages, also known as retainers or separators, are critical components in rolling element bearings (e.g., ball or roller bearings).
They serve as structural spacers that maintain uniform separation between the rolling elements (balls or rollers) and the inner/outer raceways, ensuring smooth, efficient operation.

Without cages, rolling elements could skew, collide, or unevenly distribute loads, leading to premature failure, increased friction, and reduced lifespan. Cages are typically lightweight and designed to minimize inertia, heat generation, and wear while accommodating lubrication and environmental factors

Guide reels (also known as payoff reels or winding reels) manage the uncoiling and tension control of steel billets or strips entering the mill, ensuring smooth feeding without slippage or twisting. Rollers, including alignment rollers, run-out rollers, and conveying rollers, support and direct the hot-rolled bars (temperatures ~800-1000°C initially) through the mill stands, cooling beds, and discharge systems. They maintain precision alignment, reduce vibrations, and handle high speeds (up to 20 m/s) and loads (e.g., 8-40 mm diameter rebars). Materials like high-chromium cast iron, forged SS steel, or HCHCR (high-carbon high-chromium) are common for wear resistance, with specifications often including tapered roller bearings for durability.

Guide boxes are critical components in rolling mills, ensuring precise alignment, guidance, and support of hot steel billets or bars as they pass through rollers during the rolling process. They maintain dimensional accuracy, prevent lateral movement, and reduce wear on mill components.Align steel billets/bars (hot, ~800-1000°C initially) for accurate rolling.
Prevent twisting, misalignment, or cobbling (jamming of bars).
Support high-speed rolling (up to 20 m/s in modern TMT mills)

Nylon pads, made from cast nylon (polyamide), serve as critical wear-resistant component. They function as slipper pads, guide pads, ,wear strips to reduce friction, support moving steel bars, prevent slippage, and protect machinery during the hot-rolling and conveying processes. Nylon is preferred due to its high mechanical strength, low friction, heat resistance (up to 120-150°C depending on the grade), and durability under abrasive conditions.