RE: 296] Re: Difference between BOF and OHF Steel making

[Bathula Raghuram (Mumbai - PIPING)]

See the definitions (source: Corus)

 

Basic oxygen steel making

Basic oxygen steel making is the process by which molten iron from a blast furnace is refined by the near total removal of carbon, silicon, manganese,

phosphorus and sulphur to a point from which, by the addition of appropriate ferro-alloys and aluminium, the required grade of steel can be made. The process involves the injection of high volumes of oxygen at very high pressure into a vessel which originally will have contained a charge comprising approximately 20% selected ferrous scrap and 80% molten iron. The refractory lining of the vessel is basic, as opposed to acidic in nature, and basic fluxes are also added with the aim of creating a slag into which the impurities are driven. The capacity of vessels is very variable, but typically can range from around 200 tonnes to in excess of

350 tonnes. A cast of steel can be produced in less than 20 minutes. With modern refractories, a vessel is expected to be capable of producing in excess of 1000 heats before it needs to be relined.

 

Open hearth furnace

A melting furnace with a shallow hearth, on which the charge is placed beneath a low roof. Heating of the charge is both by direct flame and by radiation from the furnace roof and sidewalls. This type of furnace is no longer used in Western Europe as a steel making unit as the Basic Oxygen and the Electric Arc Furnace Steel making processes have now replaced it, for economic and quality reasons.

 

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From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of pjo...@technip.com
Sent: Wednesday, September 26, 2007 9:07 PM
To: material...@googlegroups.com
Subject: [MW:296] Re: Difference between BOF and OHF Steel making

 

BOF is BasicOxygen furnace method of steel making while OHF is Open hearth furnace.

 

Quality point of view, Basic steel is better in impurity control while OHF may be inferior. OHF may be acidic or basic process. But in general, there is no oxygen used in it.

For more details, read any book on Steel making.

Best regards,

Prasad Joshi 
e-mail: pjo...@technip.com
Phone: +81-(0)45-506-4886

 

-----material...@googlegroups.com wrote: -----

To: <material...@googlegroups.com>
From: "Gireesh Hegde" <girees...@petrofac.ae>
Sent by: material...@googlegroups.com
Date: 26/09/2007 06:04PM
Subject: [MW:294] Difference between BOF and OHF Steel making

Members,

 

Could anyone highlight the difference between the ?Quality of steel?, if the steel is produced by BOF, and if the steel is produced by OHF.

 I understand that, steel process by BOF is more energy efficient than the steel process by OHF. But my interest is in if there are any drastic difference in the quality of steel? Please share the views.