Fields of Activity  >>   Steel
Fields of Activity
Production
STEELWORK PROCESS
 
Electric-Arc Furnaces
Steelwork process is initiated by charging the scrap used as raw material into the electric-arc furnaces. The charged raw materials are turned into liquid steel by being melted down in the electric-arc furnaces. The steel in the liquid state is then transferred to the ladle furnaces and the necessary alloying procedures are completed in here to obtain the targeted quality.

icdasIn the final stage, the liquid steel is transferred to the continuous casting machines and turned into steel billets (semi-finished goods) in required sizes. Upon assessment of the quality control analyses, steel billets are approved and delivered to the rolling mills.

ROLLING MILL PROCESS

Steel billet is charged into the re-heating furnace to obtain the required rolling temperature prior to its delivery to the rolling stand. Heating process is a part of the procedure for acquiring the required mechanical properties. After the cooling bed, where the material is quenched down to the annealing temperature, the bars are cut into the required lengths for the completion of mechanical and chemical laboratory tests and then packed in bundles for dispatch.
Objectives of the QTR Process
• To create a layer of martensite at bar surface with a predetermined depth by partial water quenching.
• To tamper the crude martensite formed at the surface by residual heat flowing from core to the surface during final air cooling.

Three Stages of the Process

Steel bar leaving the last stand of the rolling mill is submitted to a special heat treatment involving three stages.
 
1 -Water Quenching Process
The first stage consist of drastic water cooling applied to the bar it leaves the last finishing stand. The efficiency of water cooling equipment used in this stage has to be so high in order to produce a very hard cooling on the rod surface, faster than the critical rate of martensite, thus obtaining a surface layer of crude martensite.
 
2-Tempering Stage
In the second stage, the bar leaves the quenching line and is exposed to the air. The heat flow from rod core heats up the quenched surface by conduction and the martensite formed in the first stage is therefore subjected to self-tempering which assures adequate ductility while maintaining high yield strength levels.
 
3- Final Cooling Stage
The third stage occurs on the roller conveyor and it consists of a semi-isothermal transformation of the non-transformed austenite at the bar core.
 
STRETCHING PROCESS
  • Due to stresses of the steel bar being reduced when subjected to mechanical streching relief, fragility is removed and flexibility is gained.
  • As a result of enlargement of surface area of the steel by keeping four ribbed design and bar weight stable, concrete contact area is increased and thereby contact of the steel with concrete enhenced allowing greater load carrying capacity for the structures.
  • By micro-alloying with elements like vanadium, niyobium and molibdenum together with high fatigue test values, aging of the steel is delayed and the prolongation of the lives of the structure are achieved.
During hot rolling process, scales occuring on the surface of the anti-seismic materials are removed with a supplemantary operation.
  • Shows high corosion resistance in concrete fittings against rust.
  • Shows very good results in sharpy impact test.
  • High-ductility material ( Seismic Standard ) yield and tensile properties and ratios ( According to European Seismic Standards and Turkish Government Anti-Seismic Regulation ).
  • Yield Point: 500-540 N/mm2
  • Ratio (Rm/Re): 1.30 - 1.35
  • Agt%: 10 (High Ductility)
  • C%: 0,22
  • CEq%: 50(High Weldability)
International Sales

As the holder of international certificates, our department realises international sales of the following products:

  Steel billets

  Plain and deformed reinforcement steel bars

  Plain and deformed coiled wire rods group

  Coiled wire rod products groups

 

1-Industrial Quality (DQ Quality)
Low and high carbon steel wire rods for electrodes, bolts, fine wire production.

2-Construction Quality (MQ Quality)
Low carbon steel coiled wire rods for steel mesh, wire and nail production

Exporting most of its production to foreign countries, İÇDAŞ assumed an important role in Turkey’s integration with the modern world with this advanced technology and its superior quality perception. Our company exported around 1.110.000 tons of exports to 70 countries in the year 2005.

 
 
Our aim is to achieve absolute customer satisfaction in all our services. You can get in touch with the export sales department for your requests, through the following personnel.
 
 
Products

 

• STEEL BILLET
• (SEMI-FINISHED GOODS)

icdas

   
• PLAIN AND DEFORMED CONCRETE 
REINFORCEMENT BARS

DIAMETER: between 8 mm-60 mm
LENGTH: Standard 12 m
(on demand, between 0.60~18m in desired lengths)
PACKAGING: Standard ~2000 Kg bundels
(depending on the customer demand, bundles may also be made between 500-5000 kg.)
   
• PLAIN AND DEFORMED WIRE ROD GROUP

DIAMETER: Between 5,5 mm to 20 mm in diameter (PLAIN)
DIAMETER: Between 6 mm. to 16 mm. in diameter (DEFORMED)
PACKAGE: Standard ~200-3000 Kg coils.



 Please click on to enlarge.

• INTERNATIONAL WIRE ROD QUALITIES

1-Industrial Quality (DQ Quality)
Low and high carbon wire rod for electrodes, bolts and thin wire.
2- Construction Quality (MQ Quality)
Low carbon wire rods used in steel mesh, wire and nail production.

İÇDAŞ A.Ş. produces wire rods having wide range of qualities conforming to the customers’ needs and purpose for use in welding electrode, steel mesh, wire, bolts, spring, etc. manufacturing. In our opinion, you, the esteemed customer of ours, choosing the right product or material form, constitutes the most critical point (the keypoint) in this matter.

We like to point out that our technical service is always at your service to assist you in your choosing of the proper material and also like to remind you that your selection and usage of the right products shall reduce your losses (in terms of labour, material, etc.) and increase your production quality and assertiveness.

• READY TO USE STEEL (Stirrup-pile)
Stirrup and pile production in conformity with the project
 Twisting shapes of the Stirrup and Steel rods

 

• PRESTRESSED CONCRETE STRAND AND WIRE (PC STRAND&WIRE)

Prestressed Concrete Strand and Wire; It is a low relaxation, high strength construction steel.


PC Strand consists of a group of six wires helically twisted around a central wire in a single layer and uniformly. It is used in areas such as bridge/viaduct beams, reinforced concrete prefabricated building elements, concrete silo manufacturing and ground anchorage applications.

Strand Diameters: 3/8” (9,53 mm) – 0,7” (17,8 mm)


PC Wire, is produced plain or indented and is packaged and delivered in bundles of bars cut to the same length or in coils. It is generally used in railway sleeper manufacturing (90%), ground stabilization piles and beams, and pipe systems.

Wire Diameters: 3 mm – 9,4 mm



• INDUSTRIAL GASES
-Liquid Oxygen
-Liquid Argon
-Liquid Nitrogen

 


• FILLING AND ROAD STABILISATION MATERIALS
- Filling Aggregates
- Grain dimension up to No. 0-1-2-3-4-5

“FOR EACH PRODUCT; if there is a need for the QUALITY/ TECHNICAL INFORMATION, or additional information such as TECHNICAL SUPPORT + USER GUIDE + QUALITY or PRODUCT CERTIFICATE, these must be obtained from the “QUALITY MANAGEMENT” DEPARTMENT."