Iran Alloy Steel Company

Iran Alloy Steel Company is the largest producer of alloy steels in Iran and the Middle East and one of the most modern alloy steel production plants in the world, which was put into operation in 1999.

Steel mills, heavy-duty rolling mills, light-duty rolling mills, heat treatment and finishing work, equipped with the most advanced equipment and having the highest level of modern technical knowledge in the world, which can produce alloy and special steels with the best quality and in accordance with international standards. Made possible. The company's products are widely used in automotive, machine building, oil and gas and petrochemical industries, instrument making, power plants, railways, medical and surgical equipment manufacturing and other special industries.

Steel plant

1) Melting workshop

The production line of the smelter is based on the use of three electric arc furnaces, three ladle furnaces (LF), one VD unit and one VOD unit.

Arc furnaces have a capacity of 40 tons and EBT type with 36 and 43 MW UHP power and are equipped with W. CP, PDC and Ferro Alloy Feeding System, carbon injection system, lime, oxygen gas blowing system and neutral gas blowing system from the furnace floor. These furnaces are designed to charge 100% scrap or 80% sponge iron and 20% scrap.

After the melting steps in the electric arc furnace, the melt is discharged into the pan and transferred to the LF for secondary metallurgical operations.

These operations include:

Rehabilitation and refining with the help of artificial slags

Blow in the neutral gas (argon) from the bottom of the pan

alloy making

The LF furnace (LF), which is equipped with an induction stirrer and argon gas blower system, performs refining and reduction of the melt, alloying, desulfurization and homogenization of the chemical composition and temperature of the molten steel. LF is also equipped with an automatic ferroalloy charging system and an automatic slag system. The pot containing the melt is sent into the VD (Vacuum Degassing) vacuum tank if needed, which has the ability to reduce the pressure to 0.4Torr and reduce the hydrogen of the melt to less than 2 ppm.

The following operations are performed in this unit:

* Degassing of the melt (dehydrogenation, nitrogenation and deoxygenation)

* Remove floating offals

Also, in order to produce high-alloy steels with very low carbon (stainless steels), a VOD unit equipped with steam jet pump and water ring pump systems has been considered. In this unit, while creating a vacuum on the melt by injecting oxygen, decarbonization of the melt is performed.

2) Casting workshop

A: Continuous casting

Continuous casting method has metallurgical, technological and economic advantages over single-casting method, including: Disadvantages of single-casting method such as the presence of impurities, offals, macs, cracks, Separation of elements and inhomogeneity of the structure in terms of granulation and chemical analysis in the continuous casting method is minimized and on the other hand this method is simpler and faster and production costs are less than the single casting method. Continuous casting machine is an arc type with a radius of 10 meters and has two branches.

The product of continuous casting is Bloom with dimensions of 250 × 230 mm.

B: Casting ingots

Due to the dimensional and qualitative variety of steels that can not be produced by continuous casting, a single load casting unit (ingot) is also considered in the steelmaking unit. The product of single load casting is ingots with the following dimensions:

1,150 × 270 × 390 mm and weighs 1,000 kg

1,620 × 450 × 360 mm and weighs 2,000 kg

2000 × 410 × 570 mm and weight 3400 kg

Note: Ingot casting can be increased up to six tons

3) Ingot and Bloom preparation unit

Bloom preparation; Cooling the product in air or in the furnace slowly, controlling surface imperfections and performing partial or complete grinding operations and annealing in bogey furnaces for special steels.

In this part, part of the ingots is cooled in air, another part is heated in a hot charge and the other part is transferred to annealing furnaces to be stored after grinding.