Lifting Roller For Walking Beam Cold Bed

Working under severe operating conditions: heavy static load from steel bars, repeated mechanical impact, oxide‑scale abrasion, cyclic thermal shock from residual‑hot bars, plus continuous friction during bar transfer. Adopting advanced laser cladding surface strengthening technology, high‑performance alloy powder is metallurgically fused onto roller working surface to form dense, crack‑free protective overlay.

It solves typical failure modes of conventional lifting rollers: local wear, surface indentation, coating spalling and thermal‑fatigue cracking. Maintains stable roller profile to prevent scratches and surface defects on finished bars. Both brand‑new manufacturing and remanufacturing service for worn old rollers are available.

High‑energy laser beam acts as heat source; alloy powder is synchronously fed into the molten pool. Powder and roller substrate melt and solidify rapidly to achieve reliable metallurgical bonding. Dilution rate is precisely controlled within 3%‑8% (premium grade below 5%), fully retaining intrinsic performance of cladding alloy. WC tungsten‑carbide composite cladding is available for heavy‑duty high‑abrasion working scenarios.

✅ Reliable Metallurgical Bonding

Cladding layer forms genuine metallurgical bonding with roller base metal, reaching substrate‑level bonding strength. Resists peeling and cracking under repeated heavy bar impact and cyclic lifting‑lowering shock load. Far higher reliability compared with thermal‑spray coatings, cutting unplanned downtime of bar mill cold‑bed discharge station.

✅ Minimal Heat‑Affected Zone & Low Distortion

Concentrated laser energy creates small molten pool and rapid cooling speed. Roller overall deformation is strictly controlled; base‑material microstructure remains almost unchanged. Less post‑cladding grinding allowance required, well‑suited for lifting rollers with strict dimensional tolerance for cyclic mechanical movement.

✅ High Hardness & Outstanding Impact‑Wear Resistance

Surface hardness reaches HRC45‑55. With WC‑reinforced composite cladding, service life is 2‑5 times of conventional hard‑facing rollers and 5‑10 times of ordinary heat‑treated rollers. Excellent anti‑scouring performance against oxide scale and bar friction, retains stable roller profile under thousands of lifting cycles.

✅ Good Thermal‑Fatigue & High‑Temperature Resistance

Nickel‑base alloy grades such as Ni625 / Inconel625 support continuous service temperature 500‑800℃, resisting thermal‑fatigue damage caused by intermittent contact with residual‑temperature bars.

✅ Local Strengthening & Roller Remanufacturing

Cladding treatment only applies to wear‑prone working surface instead of full‑body cladding, saving expensive alloy raw materials and shortening lead‑time. Worn, indented or dimension‑deviated old lifting rollers can be restored to original drawing dimension and performance. ‑ Repair cost: 30%‑70% lower than brand‑new rollers ‑ Delivery cycle: shortened more than 50% ‑ Multiple repeated remanufacturing cycles are supported.

✅ Automated Manufacturing & Eco‑Friendly Production

Produced by multi‑axis robotic laser cladding equipment with automatic powder feeding and intelligent path planning. Coating quality maintains high consistency for batch orders. Compared with traditional manual hard‑facing welding, it generates less smoke, spatter and energy consumption, complying with green‑manufacturing standards.

Specially designed for walking‑beam cold‑bed discharge mechanism. Used for rebar, round steel and alloy bar rolling lines. Realizes cyclic lifting‑transfer of cooled bars from cold‑bed racks to output roller table.

Laser‑cladded lifting rollers for walking‑beam cold beds address key pain‑points: cyclic impact wear, thermal‑fatigue cracking and coating spalling at cold‑bed discharging position. Stable mechanical performance guarantees smooth bar transfer, reduces frequent roller replacement and maintenance shutdown, and lowers total operating cost for steel plants.

Custom cladding‑material selection, special dimension adaptation and remanufacturing quotation for used rollers are available. Please contact our technical team.