Descaling for Metalworking & Steel Mills

Descaling Spray Nozzles for Steel & Metal Mills

Reliable Scale Removal for Better Surface Quality

Mill scale and primary oxides can cause surface defects, raise rolling forces, and accelerate wear on work rolls. NozzlePro descaling systems combine high-impact spray nozzles, optimized header geometry, and properly sized pumping systems to remove oxides before critical rolling and finishing steps. The result: improved surface quality, reduced roll wear, and more stable downstream processes.

Key Benefits of NozzlePro Descaling Solutions

Defect Reduction – removes primary and secondary scale for smoother finishes
Lower Rolling Forces – reduces roll/workpiece wear and extends roll life
Uniform Coverage – consistent impact density across strip width
Optimized Efficiency – proper flow/pressure selection minimizes water and energy use
Rugged Hardware – durable components built for high-temperature, abrasive mill environments

Nozzle Types for Descaling

Choose nozzles based on impact, coverage, and resistance to clogging. Confirm compatibility with your plant’s water quality and operating temperatures.

Nozzle Type	Pattern	Typical Pressure	Best For	Notes
Solid Stream	Narrow jet	80–200 bar	Maximum impact on stubborn scale	High targeting precision; requires higher pump HP
Flat Fan (High-Impact)	Sheet jet	60–120 bar	Uniform strip coverage	Standard for hot strip descaling
Spiral / Full Cone	Dense cone	40–80 bar	Broad coverage, secondary rinse	Combines scale flushing with cooling

Impact Density Planning

Consistent impact density across the strip width ensures uniform descaling. Typical overlap is ~30% with angle adjustments for edge reinforcement.

Spray Angle (°)	Standoff L (mm)	Coverage W (mm)	Suggested Spacing S (mm)	Edge Strategy
40°	250	~183	~128	Increase overlap at edges
60°	250	~289	~202	Balanced coverage
80°	250	~420	~294	Watch for overspray

Scale Removal vs. Pressure

Higher pressure improves jet coherence and oxide removal. Select pressure according to scale thickness, temperature, and steel grade.

Pressure (bar)	Relative Impact	Effectiveness	Typical Use
40	Low	Light scale / rinse	Secondary descaling
80	Medium	Moderate scale	General hot strip
120	High	Heavy oxide	Primary descaling
180	Very High	Stubborn/baked scale	Solid stream targeting

Pump & Water Sizing (Example)

Power demand scales with pressure and flow: HP ≈ (GPM × PSI) / (1714 × η) (η ≈ 70% efficiency).

Flow (gpm)	Pressure (psi)	Est. HP	Header Width (mm)	Notes
50	1200	~50	1200	Light/medium descaling
80	1500	~100	1500	High-impact fan jets
100	2000	~167	1800	Solid stream targeting

Temperature & Oxide Considerations

Strip Temp (°C)	Oxide Condition	Recommended Strategy	Notes
650–800	Mixed oxides	80–120 bar flat fans	Balance impact & coverage
800–950	Primary scale	120–180 bar; tighter spacing	Increase overlap at edges
950–1050	Thicker / brittle	Solid stream assist zones	Short standoff, precise aim

Engineer a Reliable Descaling Header

NozzlePro helps mills design headers with the right nozzle type, angle, spacing, and pumping setup to achieve consistent impact density and reliable scale removal—without excess water or wasted energy.