Ferro Gilan Complex

Cold Rolling Mill

Cold Rolling Mill
In metalworking, rolling is a metal forming process in which metal stock is passed through one or more pairs of rolls to reduce the thickness and to make the thickness uniform. The concept is similar to the rolling of dough. Rolling is classified according to the temperature of the metal rolled. If the temperature of the metal is above its recrystallization temperature, then the process is known as hot rolling. If the temperature of the metal is below its recrystallization temperature, the process is known as cold rolling. In terms of usage, hot rolling processes more tonnage than any other manufacturing process, and cold rolling processes the most tonnage out of all cold working processes. Roll stands holding pairs of rolls are grouped together into rolling mills that can quickly process metal, typically steel, into products such as structural steel (I-beams, angle stock, channel stock, and so on), bar stock, and rails. Most steel mills have rolling mill divisions that convert the semi-finished casting products into finished products.

Cold Rolling Mill

This plant has an annual production capacity of 500.000 tons, and produces its products as per the following international standards for the following uses.

A)Standards;

Cold rolled products are produced as per the standards listed below,
ASTM, DIN,JIS,AFNOR,UNI,BS & En ( Euro Norm ), Full details are available in the tables below.

B)Uses

  • General and structural
  • Automotive industry
  • Home appliances
  • Pipes
  • Metal forming and deep drawing, etc…

Dimensional and Weight specifications

*Cold rolled products include full hard products.

The Variety Of Qualities
Being Produced at Ferro Gilan Complex

Pickled Products

Table Of Comparison Of Flat Products
Standards With Reference To End Use

Pickled Products
Dimensional Specification

Cold Rolled Products

Full hard Coil Will Be Delivered Based On Order By
Customer And Chemical Composition Will Be Guaranteed

Coil Weight Range:

Coils Can Be Produced With The Following Weights:

Electrolytic cleaning Line (E.C.L)

Cold rolled coils processed in cold rolling mills have a thin film of residual rolling oil on the surface rolling. The alkaline cleaning of cold rolled coils totally clean the surface of the strip before annealing. This electro-chemical cleaning process is called Electrolytic Cleaning.

The Technology

An ECL line cleans the strip surface of oil and dirt by chemical action, using an alkaline solution. The strip passes between electrodes which are immersed in tanks containing the electrolyte. This technique is more effective in cleaning cold rolled steel than conventional cleaning processes used on high speed electro tinning and alkaline cleaning lines.

Fact Sheet
Following Figures Have Been Achieved:

Tension Leveling Lines (T.L.L)

Tension Leveling

In many cases, the sheet metal flatness required of today’s strip metal processors can only be achieved by the use of tension levelers. Precision flatness is obtained when the metal’s fiber lengths are made uniform across the entire width of the strip by elongating the metal beyond its yield point. When the strip is passed through the leveler under tension internal stresses within the metal are eliminated, and flatness or shape correction to tolerances approaching zero “I” units can be achieved.

Tension Leveler

Consists of an un-driven leveler arrangement with entry and exit tension bridles. The degree of elongation required to level the strip is primarily determined by the differential in speed or tension generated between the two bridles. This is controlled automatically by a microprocessor based system. Bridles vary in configuration and complexity, depending on the type and dimensions of the strip metal to be processed. They can be equipped with several different drive systems. These include closed-loop mechanical differential, all-electric drives and combination electro-mechanical drives.

Incoming Coil Data

Outgoing Coil Data

HICON/H2 ® bell annealers for steel strip

Both the mechanical properties and the surface finish are important quality factors for cold-rolled strip. Both factors are influenced considerably by heat treatment. HICON/H2 annealing technology achieves excellent results at low cost per ton annealed.

Wide range of applications

Low carbon steel

  • soft steels
  • CQ, DQ,DDQ,EDDQ,SEDDQ
  • IF grades
  • ULCN steels
  • high tensile strength steels
  • micro alloyed steels
  • phosphor alloyed steels
  • bake hardening grades
  • high strength IF steels
  • isotropic IF steels

Tin plate

  • T1 to T4

Silicon steels

  • non-oriented steels
  • oriented steels

Medium to high carbon steels

  • non-alloyed steels
  • low-alloyed steels
  • high-alloyed steels (HSS etc.)

Rust – resistant and acid – resistant steels

  • martensitic Cr steels
  • FERRITIC Cr steels

Technical specification of products

Pickled Standards

Width tolerance

  • ASTM A568 M/93a
  • EU 51/82
  • EU 112/82
  • DIN 1543
  • AFNOR NF A46.51/84
  • DIN 1016
  • BS 1449/83
  • JIS G 3193/90
  • JIS G 3131/90
  • DIN 1543
  • JIS G3193/90
  • DIN 1016/72
  • EN 10051-91

Height tolerance

  • ASTM A568 M/93a

Cold Rolled Standards

  • EU 131/77 NORMAL
  • UNI 7958/79
  • UNI 6623/77 NORMAL
  • AFNOR NF 46402/81 NORMAL
  • BS 1449 18/89
  • JIS G 3141/90 (TOLLAA) NORMAL
  • DIN 1541/75 NORMAL
  • EN 10131 – 1991
  • ISIRI 5723
  • ISIRI 5722

Surface Appearance

Surface Finish And Roughness Values

  • A: Furniture
  • B: House Appliances, Drums, Radiators, Structural And General Use
  • C: Automobile
  • D: Enamelling

Full Hard Products Are Presented With Following Roughness:

  • A: Less Than 0.27 Micron
  • B: 0.35 to 0.55 Micron
  • c: 0.75 to 1.1 Micron

Surface Protection

Depending on the type of product and also product quality required, the
cold rolled are divided into two groups shown in the following table:

A) Oiled Surface
In the case of using steel straps and angles in order to protect the edge in
packing, our products are guaranteed against staining 2 month after delivery

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