Roll Grades Steel

With HSS-rolls an extraordinary rolling performance is obtained by extremely hard and wear-resistant special carbides of the alloying elements W, Mo, V and others which are imbedded in a high alloyed and treated matrix, having an excellent high-temperature strength and tenacity. The TERANIT-roll achieves the longest campaigns and highest rolling performances with a first-class roll surface. For the various applications we provide HSS-rolls with finely graded carbide contents of Semi-HSS (TERANIT A) up to genuine HSS (TERANIT B, C, D).

Chrome Steel CROMANIT CS
Chrome steel rolls with low up to medium chrome carbide contents are used especially in roughing stands of hot strip and Steckel mills due to their high thermal wear resistance. They excel due to their reliability and good rolling performances.

Chrome Iron CROMANIT
Chrome Iron rolls with higher carbide contents are used as finishing rolls for sheet and strip. Due to their high wear resistance and a fine-grained structure CROMANIT-rolls achieve best rolling performances with excellent rolling stock surfaces.
Typical applications are:

– Finishing stands of hot strip mills
– Work and skin pass rolls in cold strip mills
– Work rolls in plate mill stands
– Rolls with shaped surfaces for the production of corrugated sheet (rhombic design, tear design and others.)

Indefinite Chill ULTRANIT
Typically the Indefinite-roll is used in the last finishing stands of hot strip mills, in Steckel stands and plate mill stands. Further applications are work and back-up rolls in finishing and skin pass stands of cold strip mills as well as in the production of non-ferrous metals. In comparison to standard roll grades the advanced and especially alloyed Indefinite-rolls achieve higher performances. The material grade ULTRANIT S has additional high wear-resistant special carbides which are embedded in a fine-grain matrix together with finely dispersed graphite.

Nodular Cast Iron SPHÄRONIT
Sphäronit-rolls excel due to a predominantly pearlitic structure with embedded cementite and spheroidal graphite. The latter confers to the roll material a high resistance and a good thermal conductivity. Also, this material is mostly used for edgers in hot strip and plate mills.

Nodular Cast Iron ASTRANIT
KB-ASTRANIT-rolls obtain their excellent wear resistance due to high alloying contents. These rolls require, however, an optimal and intensive nozzle cooling.

Cast Steel SOLANIT
SOLANIT-rolls cover the range of eutectoid and hypereutectoid cast steel grades. The hardness and wear resistance of the various material grades are obtained by alloys and intensive heat treatment (SOLANIT C and D). Furthermore the rolls can be supplied graphitized (SOLANIT G) and high graphitized (SOLANIT SG). These rolls are typically used as edger rolls in hot strip and plate mills.

Special Alloys
The use of special micro-alloying elements in combination with an intensive heat treatment allows an improvement of the performance of all KB-roll grades and an individual customization. These roll grades are characterized by an additional “S” in their brand name.