Laminar Cooling System for Hot Strip Mills

Product Specifications

Technical details and manufacturing context for Laminar Cooling System

Definition

The Laminar Cooling System is a critical component within the Integrated Hot Strip Rolling and Finishing System, responsible for the controlled cooling of hot-rolled steel strips after they exit the finishing mill. It uses precisely arranged headers to apply water in laminar (smooth, layered) flow patterns across the strip's surface, enabling accurate temperature reduction to achieve desired mechanical properties, metallurgical microstructure, and flatness in the final product. The system operates by passing the hot strip through a series of cooling banks equipped with headers and nozzles. Water is discharged in controlled, laminar jets onto both the top and bottom surfaces of the strip. Cooling intensity is regulated by adjusting water flow rates, header activation patterns, and strip speed to follow a predetermined temperature-time profile (cooling curve), transforming the austenitic microstructure into the target phase (e.g., ferrite, pearlite, bainite). Key parameters include cooling water flow rate (500–2000 m³/h), water temperature (20–35 °C), operating pressure (0.3–0.8 MPa), cooling zone length (10–60 m), strip thickness range (1.0–25.4 mm), strip speed (60–300 m/min), cooling rate control accuracy (±5%), temperature uniformity (±10 °C), water filtration level (50–200 µm), nozzle type (laminar), material of construction (SS304, ASTM A240), electrical power consumption (50–200 kW), control system voltage (380–480 V AC, IEC 60038), and protection rating (IP54–IP65, IEC 60529). Materials on file include stainless steel for headers/nozzles, carbon steel for piping/framework, and wear-resistant alloys. This directory entry provides reference ranges; actual values must be confirmed with the legal manufacturer or supplier for specific applications. The system is essential for achieving consistent product quality in hot strip mills.

Working Principle

Hot steel strip passes through a series of cooling banks equipped with headers and nozzles. Water is discharged in controlled, laminar jets onto the strip's top and bottom surfaces. The system regulates cooling intensity by adjusting water flow rates, header activation patterns, and strip speed to follow a predetermined temperature-time profile (cooling curve), transforming the austenitic microstructure into the target phase (e.g., ferrite, pearlite, bainite).

Common Materials

Stainless Steel (headers/nozzles), Carbon Steel (piping/framework), Wear-resistant Alloys

Technical Parameters

Parameter	Typical range	Notes & selection driver
Cooling Water Flow Rate	500–2000 m³/h	Depends on strip thickness and speed
Cooling Water Temperature	20–35 °C	Higher temperature reduces cooling efficiency
Operating Pressure	0.3–0.8 MPa	Below 0.3 MPa insufficient cooling
Cooling Zone Length	10–60 m	Longer zones allow slower cooling rates
Strip Thickness Range	1.0–25.4 mm	Thicker strips require higher flow rates
Strip Speed	60–300 m/min	Affects cooling time and uniformity
Cooling Rate Control Accuracy	±5 %	Critical for microstructure properties
Temperature Uniformity	±10 °C	Across strip width and length
Water Filtration Level	50–200 µm	Prevents nozzle clogging
Nozzle Type	Laminar	Ensures uniform flow pattern
Material of Construction	SS304	Corrosion resistant for water contactASTM A240
Electrical Power Consumption	50–200 kW	Includes pumps and control system
Control System Voltage	380–480 V AC	Three-phase, 50/60 HzIEC 60038
Protection Rating	IP54–IP65	For electrical enclosuresIEC 60529

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Cooling Header Part
Distributes cooling water through nozzles in a laminar flow pattern onto the strip surface

Material: Stainless Steel
Water Flow Control Valve
Regulates water flow rate to individual headers or banks for precise cooling control

Material: Stainless Steel/Bronze
Nozzle Array
Forms laminar water jets; design affects water distribution and impact uniformity

Material: Wear-resistant Ceramic/Alloy
Piping Network
Transports cooling water from supply to headers under pressure

Material: Carbon Steel/Stainless Steel

Manufacturers of Laminar Cooling System

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Frequently Asked Questions

What is the typical cooling water flow rate range?

The reference range is 500–2000 m³/h, depending on strip thickness and speed. Confirm the exact value for your specific application with the manufacturer.

What operating pressure is required?

The reference range is 0.3–0.8 MPa, with as a verification standard. Below 0.3 MPa, cooling may be insufficient. Verify with the supplier.

How is temperature uniformity achieved?

Temperature uniformity is maintained within ±10 °C across strip width and length, achieved through controlled laminar flow and header activation. Confirm with the manufacturer.

What materials are used in construction?

Stainless steel (SS304, ASTM A240) for headers/nozzles, carbon steel for piping/framework, and wear-resistant alloys. Verify material grades with the supplier.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Max: 10 bar (145 psi)
flow rate:	Per nozzle: 50-200 L/min
temperature:	Entry: 600-900°C, Exit: 200-400°C
slurry concentration:	Max: 5% solids by weight

Laminar Cooling System

Product Specifications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards