The GrafTech™ Refractory System is characterized by a thin and conductive furnace hearth wall lining. The unique low permeability materials used for the wall are HotPressed™ Carbon and Semigraphite small bricks. This system allows for the high thermal conductivity bricks to be cemented to the shell without the use of a rammed joint as well as to allow for expansion and movements in the lining without cracks forming. The HotPressed™ bricks and the total wall configuration allows for a “scull” to freeze, that has proven to protect the refractory wall from deterioration and premature failure, e.g. mushroom shaped wear at the junction hearth wall/bottom pad, carbon block deterioration and cracking. This system and the materials used are the foundation for the long and trouble free campaigns recorded by GrafTech customers worldwide. In the bottom pad, large high quality carbon blocks and graphite is used. The GrafTech materials used in the Hearth Calculator are any or all of the following:
- NMA™ HotPressed™ Carbon Brick
- NMD™ HotPressed™ Semigraphite Brick
- CJR™ Graphite
- CS™ Graphite
- CSX™ Graphite
- CBY™ Graphite
- GradeD™ Carbon Block
- UCB™ Block
- UMP™ MicroPore Block
- RP3™ Ram
- RP4™ Ram
- EZRam™ RP10 Ramming Paste
- SmartRam® RP20 Ramming Paste
- C34™ Cement
When planning a reline or a new furnace project, The Hearth Calculator will enable you to get a cost indication immediately. Speeding up the planning process and potentially reducing project cost, this web based tool allows the project engineer, the furnace operator or the purchaser to enter the actual data for the blast furnace hearth in question. This results in an instant budgetary cost indication for a GrafTech supplied hearth lining. In addition, the Hearth Calculator user can easily demonstrate how changing different parameters might impact your investment.
But, as we all know, there is much more to the “lining cost” than the initial price paid; for estimating the long term value in use of your lining investment, please consult the following Hearth Investment Financial Model Paper.
**The calculations and methodology used in this Hearth Financial Investment Model worksheet are only for illustrative purposes. All assumptions and variables should be reviewed and adjusted based on prevailing facts and circumstances. GrafTech makes no warranties, express or implied, as to the accuracy of indicated or implied results and assumes no liability arising out of the use of this Hearth Financial Investment Model. The information contained in or derived from this model should not be used to establish specification limits or used alone as the basis of design. Except as expressly agreed in writing. GrafTech’s liability to purchasers is subject to GrafTech's standard terms and conditions of sale.