Lance tubes for different types of lances

Lime is a calcium-containing inorganic material used in many industries:

  • Iron and steel making
  • Construction and building
  • Chemical industry
  • Environmental application
  • Fertilizer Industry
  • Sugar industry
  • Pulp making

One of the most important and critical parts of the process is the calcination of the limestone.

Rotary.jpg

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There are two main types of lime kiln:

Shaft kilns

  • Counter-current
  • Regenerative
  • Annular

Rotary kilns

Our tubes are mainly used to manufacture the tip of the lances used in the regenerative kilns.

Regen double.jpg

Burners.jpgFuel is injected from the lances on the top where the temperature is lower, but moving through the tips of the lances the conditions become harsher and harsher. It is therefore necessary to select a material able to withstand hot corrosion and erosion at the same time.

Important factors when selecting materials are:

  • Type of limestone: composition, size, impurities (S, Cl)
  • Type of fuel injected through the lances: composition, impurities, solid particles
  • Temperature: min., max., cycles
  • Lance Design: dimensions, fabrication, design
  • Lance Material: carbon steel, low alloyed, stainless, special steel
  • Kiln operation
Lance tube materials (other grades can be offered on request)
Sandvik grade
(UNS)
Description
Sandvik 253 MA®*
(UNS S30815)

Austenitic stainless steel alloyed with nitrogen and REM (rare earth metals). A multi-purpose grade suitable for temperatures from 600 to 1000ºC (1112 to 1832ºF).

Sandvik 4C54**
(UNS S44600)

Ferritic stainless steel with a high chromium content (26.5%) suitable for sulphudizing conditions. Suitable for temperatures from 600 to 1000ºC (1112 to 1832ºF).

* 253 MA® is a trademark owned by Outokumpu OY.
** Sandvik 4C54 performs well also under sulphidizing conditions.

Please contact our Technical Marketing for support in choosing the right grade.

Technical services

If you are looking for ways to improve the service life of your equipment and establish a more efficient process, we can help you.
Read more about our technical services

Case story

Halved lance tube consumption and increased productivity with Sandvik 253 MA.
Read the case story

Stock program

Sandvik holds stock of several commonly used grades and sizes of high-temperature tubes.