BOF

BOF

Tallman Technologies was the first BOF lance component manufacturer in North America and is now one of the largest in the world, with over 50 years experience in steel plants on six continents. Our product development team has the in-depth process knowledge and experience that allows us to work with our clients to develop a custom solution that is optimized specifically for their process.

Products

BOF Centrifugally Cast Lance Tips

Tallman Technologies produces BOF lance tips by using a proprietary and unique centrifugal casting grain refinement method. This results in a monolithic lance tip with the combination of unprecedented jet precision and outstanding wear characteristics, both of which have been proven to provide excellent refining performance and increased lance tip life.

Tallman Technologies BOF lance tips also contain our patented SWIRL COOL technology. Using computer based computational fluid dynamic models, the internal geometry of the lance tip is designed to maximize water cooling efficiency, which further prolongs lance tip life.

Tallman Technologies has adapted the latest supersonic jet technology from NASA and the aerospace industry specifically for the unique requirements of high temperature steelmaking process. Together with our centrifugal casting technology and our state of the art 6 axis CNC machine, our complex geometry lance tips offer unprecedented precision and efficiency, which leads to improved steelmaking performance and yield

BOF Centrifugally Cast Lance Tips


Secondary Oxygen Distributor Lances (SD Lance)

Tallman Technologies’ Secondary Oxygen Distributor Lances are custom designed to distribute oxygen to the freeboard of the BOF. Using secondary oxygen allows the steelmaker to reduce (or even eliminate) lance skulling, better control the converter profile and mouth build-up and in some cases, stretch hot metal usage and increase scrap consumption.

Secondary Oxygen Distributor Lances (SD Lance)


CleanLance

Tallman Technologies’ CleanLance is specifically designed to address lance skulling in the BOF. By installing a secondary oxygen distributor on the existing oxygen lance, exothermic reactions are used to prevent lance skulling.

Benefits:

  • Improved safety by dramatically reducing and even eliminating lance skull formation
  • Increased working time by reducing lance cleaning and maintenance
  • Reduces slopping and improves refractory consumption
  • Lowers the total Iron in slag
  • Faster heat times from the increased heat generated through decarburization of the high iron droplets in the slag and through post combustion of CO to CO2 in the off-gas
  • Combine with the patent pending Tallman TrueLance™ Internal Lance Support System (ILSS) for unsurpassed reliability
  • Can be used in all converters (LD, LBE, etc.)
    • No change to blowing practices (oxygen flow rate, lance height, etc.)
    • Total oxygen per heat does not change
    • Little or no change in CO recovery
    • Metallurgical results unchanged
CleanLance

KoneKleener

Tallman Technologies’ KoneKleener is specifically designed to address mouth and cone build-up in the BOF. By installing a secondary oxygen distributor on the existing oxygen lance, exothermic reactions are used to prevent build-up in the cone and mouth of the converter and to make build-up that does occur easier to remove.

Benefits:

  • Reduced down time by reducing maintenance in the cone and mouth areas of the converter
  • Improved performance and increased working volume
  • Reduces slopping and improves refractory consumption
  • Lowers the total iron in slag
  • Faster heat times from the increased heat generated through decarburization of the high iron droplets in the slag and through post combustion of CO to CO2 in the off-gas
  • Combine with the patent pending Tallman TrueLance™ Internal Lance Support System (ILSS) for unsurpassed reliability
  • Can be used in all converters (LD, LBE, etc.)
    • No change to blowing practices (oxygen flow rate, lance height, etc.)
    • Total oxygen per heat does not change
    • Little or no change in CO recovery
    • Metallurgical results unchanged
KoneKleenerTM

Sub-Lance Tips

Tallman Technologies' Sub-Lance Tips are designed for long life. We optimize the cooling design to reduce skull build up the tip and have the ability to apply hard weld overlay material to the inside probe mating surface which provides a stronger and more durable contact area.

Sub-Lance Tips

Post Combustion Lance Tips

The Tallman Technologies designed Post Combustion lance tip can provide proven performance improvements to the BOF process. Post combustion can increase the amount of scrap usage in the charge, while reducing the amount of lance skull and build-up in the cone section. Through production experience, Tallman Bronze can custom design a Post Combustion Lance Tip to the process requirements and constraints which will provide improved melting performance in the vessel. Tallman Bronze offers Post Combustion lance tips in either a fabricated or cast design. Each with its own respective advantages.

Post Combustion Lance Tips


Parabolic Lance Tips

Tallman Technologies has adapted the latest supersonic jet technology from NASA and the aerospace industry specifically for the unique requirements of high temperature steelmaking processes. Together with our centrifugal casting technology and our state of the art 6 axis CNC machine, our Parabolic lance tips offer unprecedented precision and efficiency, which means better steelmaking performance and yield.

Parabolic Lance Tips

Services

Tallman Technologies offers BOF lance repair and maintenance services, together with our partners in North America and around the world. We service and repair water-cooled oxygen, post combustion and deskulling lances for BOFs and EAFs from all manufacturers to original OEM specifications. We can also provide upgrades and improvements to reduce maintenance costs and improve product quality.

Our product development team can develop custom refining solutions optimized for your process and provide the technical support needed to enhance lance performance.

BOF Services
BOF Services
BOF Services

Technologies

ClearLance

CleanLance

Tallman Technologies’ CleanLance is specifically designed to address lance skulling in the BOF. By installing a secondary oxygen distributor on the existing oxygen lance, exothermic reactions are used to prevent lance skulling.


KoneKleener

Tallman Technologies’ KoneKleener is specifically designed to address mouth and cone build-up in the BOF. By installing a secondary oxygen distributor on the existing oxygen lance, exothermic reactions are used to prevent build-up in the cone and mouth of the converter and to make build-up that does occur easier to remove.


Tallman TrueLance

Tallman Technologies’ patented TrueLance Internal Lance Support System (ILSS) brings strength to your SD Lance by preventing bending at the softer copper distributor assembly while in service, during deskulling or during shipping, unloading and loading operations.

Benefits:

  • Stronger Lances
    • Longer lance life and less frequent distributor replacements
    • Improved resistance to mechanical damage during deskulling
    • Reduced damage during transport and lifting operations
    • Elimination of protective transport sleeves
    • Increased safety
  • Straighter Lances
    • Improved blowing characteristics and performance
    • Improved vessel wear characteristics
  • No modification to existing lance components required
  • Easily retrofitted into existing SD Lance fleets

Benefits


SWIRL COOL Technology:

To optimize lance tip life, Tallman Technologies has developed a patented SWIRL COOL™ cooling system for BOF lance tips and specific designs of EAF lance tips. The more evenly distributed cooling profile and improved heat transfer from the copper lance tip to the cooling water reduces the wear between the ports. Longer lance tip life and efficiency will also be achieved by retarding the erosion of the exit port.

Using computer based computational fluid dynamic models, the internal geometry of the lance tip is designed to maximize water cooling efficiency, prolonging the life of the tip.

Swirl Cool Technology
Swirl Cool Technology

Computational Fluid Dynamics

Tallman Technologies employs computational fluid dynamics (CFD) modeling in order visualize and predict how liquid flows through our products. This allows us to optimize the cooling efficiency of a particular design and predict the effectiveness of any modifications.


Calorizing Lance Tips

Calorizing creates a protective barrier on the copper casting that prevents liquid iron drips from penetrating the surface and casing "bullet holes".

Calorizing is a pack diffusion process where the copper casting is placed in a sealed retort containing aluminum powder. The casting is heated and aluminum is diffused into the surface, creating a copper aluminide inner layer and an aluminum oxide outer layer.

The Coating is diffused into the copper thereby creating a perfect bond with the copper substrate. The thickness of the coating is approximately 1 mm and consists of three layers:

  1. An outer layer of Aluminum Oxide
  2. A thick middle layer consisting of intermetallics in Cu-Al matrix
  3. A thin uniform Cu-Al diffusion layer at the interface
Calorizing Lance Tips