Skin pass mill

Cold rolling

Skin-pass mills for a perfect finish

Today, there is cold-rolled strip almost everywhere you look. It comes with various surface effects: high-gloss, matt or anywhere in between for beautiful, elegant finishes. Yet steel strip surfaces are not only good-looking, they also have important technical functions. Take for example the correct roughness, which ensures perfect painted surfaces. Other material properties are essential for industrial processing, e.g. deep drawing.

Most important of all steps here is skin-passing following cold strip manufacture. Skin-pass mills (SPM) from SMS group achieve the precise mechanical and geometrical properties you need for your applications. It’s a process that serves to attain the correct yield points and the desired surface characteristics such as roughness and flatness.

Concepts

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Designs for hot and cold rolled strip

Skin-pass mills are installed at the end of the flat steel production process chain. They are essential for smooth processing of steel strip. There are five basic types of skin-pass mills available from SMS group. The options for skin-passing carbon steel are: an independent rolling facility, a so-called offline SPM, or a continuous solution integrated in a strip processing line (inline skin-pass mill – ISPM).

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Continuous operation and high productivity

It’s technically possible to install SPMs directly inline in the exit section of continuous annealing (CAL) or hot-dip galvanizing lines (CGL). Here’s how you benefit from continuous strip processing: lower cost and effort for coil handling, better productivity, and higher profitability.

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Skin-passing hot strip

Skin-passed hot strip offers you these advantages: Most importantly, this process helps you attain perfect strip flatness. It also harmonizes the yield points and prevents the flow and break lines that can occur during uncoiling. Furthermore, the downstream pickling process is easier because skin-passing breaks up the scale layer.

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Applying a gloss finish to stainless steel strip

The next stage after cold-rolling and recrystallization is skin-passing the stainless steel strip. This produces high-gloss surfaces and achieves the desired mechanical strip properties such as deep-drawing strength. 

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Second rolling stage for tinplate: double cold reduction mills (DCR)

A special feature of tinplate production is the second rolling step for thickness reduction after annealing. Running parallel to this is a temper rolling process that prepares the strip for further surface finishing and coating. Our twin-stand double cold reduction mills (DCR) combine reduction rolling and skin-passing in a single mill. 

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Special applications and extended elongation

Yet SPMs are even more versatile. They are also ideal for use in pickling and cut-to-length lines or systems for extended strip elongation. Whatever your requirements, you can rely on optimal SPM design from SMS.

Technology

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Superior actuators for roll gap setting

Outstanding CVC® plus 4-high and CVC® plus 6-high designs for better yield and quality, proven by more than 800 installed systems:

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Extended bending system (EBS)

Unique to our extended bending system (EBS) is the maximum flexibility it creates in skin passing. It works by adapting rolling forces to the material and surface requirements. That guarantees precise control of low rolling forces.

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Dry strip system (DS system)

Now available to you is our new-generation DS system. It offers you an ideal, contact-free way to remove rolling emulsion residues from strip. What makes this system so highly efficient is that it needs less compressed air.

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ECOLub skin-pass system

As an operator of skin-pass mills, you save both resources and money by identifying and unlocking cost-cutting potentials. Moreover, you can expand your product range and increase product quality. 

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X-Shape flatness measuring and control

Stand-alone measuring system for flatness control perfectly tailored to your process requirements.

References

Electrical and automation systems

X-Pact® Advanced Thickness Control

Highest quality even during acceleration and deceleration

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X-Pact® Coiler Control

Technological control system to ensure best product quality and high process stability during strip winding on up- and down coilers.

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X-Pact® Mill Stand Control (TCS)

Technological Control System to ensure highest product quality (HGC, WRB, IRB, CVC®)

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X-Pact® Pass Schedule Calculation (PSC®)

The system calculates the set-points per pass according to current process parameters and limitations

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X-Shape Flatness Measurement and Control

Stand-alone measuring system for flatness control perfectly tailored to your process requirements.

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Product quality analyzer (PQA)

Solution for smooth process flow and constant high quality

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Upgrade Package Basic Automation

New state of the art hardware, latest development software

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Virtualization

Safeguarding plant lifetime

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X-Pact® Drive

Low voltage frequency converter as integral part of X-Pact®

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X-Pact® Energy Advisor

Energy management for metallurgical plants and rolling mills

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X-Pact® MES 4.0

Production planning and scheduling for all production units in the plant

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Service

eDoc

Digital documentation: First step to a smart plant.

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Emergency support - Remote Service

For easy identification of defects and malfunctions and quick initiation of measures for fault elimination.

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Genius CM

The Genius Condition Monitoring includes a modularly designed, permanent online monitoring system.

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Long-term maintenance services

SMS group offers you the full range of services along the value chain, while you can focus entirely on your core competences.

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Maintenance tools - IMMS

The Integrated Maintenance Management System (IMMS) guarantees effective and economical maintenance.

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Safety Locator

Protect your most valuable asset - your employees - with the SMS group Safety Locator!

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Service for X-Roll® Oil Bearing

X-Roll® Oil Bearing - An elementary part of modern rolling mill technology

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Smart Maintenance

Digitalize your maintenance with SMS group!

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Videos

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Gazi Metal Mamülleri, Turkey - Offline SPM

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Shougang Jingtang United Iron & Steel, China - Inline and offline DCR mills

Downloads

ECOLub Skin-Pass System: W6-310
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X-Roll® Oil Bearing

Contact

SMSgroup Schanderl, Jürgen

Jürgen Schanderl

SMS group GmbH
Technical Sales Reversing Cold Rolling Mills
Wiesenstraße 30
57271 Hilchenbach
Germany

Phone : +49 2733 29 2739
Fax : +49 2733 29 772739

SMSgroup Böttner, Detlef

Detlef Böttner

SMS group GmbH
Head of Sales Electrics/Automation Cold Rolling Mills
Wiesenstrasse 30
57271 Hilchenbach
Germany

Phone : +49 2733 29 1257
Fax : +49 2733 29 771257