SARAMET

The rolls made of the powdermetallurgically produced high speed steel SARAMET provide an alternative for rolling speeds from 0,2-20 m/sec in intermediate stands as well as for critical applications like slit, angle and special profile rolling.

The homogeneous structure of the 1-5 mm sized spheroidical and hard carbides results in excellent performances. The microstructure is essential to guarantee a high wear resistance and a high toughness at the same time.

SARAMANT VG 50


Manufacturing
The gas-atomised powders of the alloys below are compacted to parts without any porosity and with an ideal carbide distribution, using the HIP process at a temperature of 1100- 1200 °Celsius and a pressure between 1000 to 1200 bars.

The steel can is then machined off, the SARAMET rolls are hardened and tempered to 50 - 62 HRC and finish machined or ground.

Rings for SARAMET angle rolling
Rings for SARAMET angle rolling

Applications
The high carbide content of SARAMET roll rings combined with the hardness of 50-62 HRC results in a high wear resistance.

The spheroidical shape and the homogeneous distribution of the 1-5 mm sized carbides confer a relatively high toughness to this material. These are the reasons for the success in hot rolling with speed ranges from 0,2 to 20 m/sec in intermediate stands and for special profile rolls.



Cooling
The hardness of 50-62 HRC and the thermal stress of the rolls require efficient cooling immediately after the contact with the hot roll stock. The layout of the cooling pipes as well as the cooling parameters should meet the requirements which are applied when using tungsten carbide.

Machining
The machining of the PM-HSS rolls SARAMET can be done by copy turning with ceramic or CBN turning tools or by grinding with CBN wheels. Depending on the roll stock, the rolling conditions and the rolled tonnages edressing of the diameter by 0,5 - 2,0 mm may becomes necessary.



High speed steel grades SARAMET
  C % W % Cr % V % Mo % Co %
SARAMET 4 1,3 5,5 4,5 4 4,5 -
SARAMET 9 1,8 - 5,2 9 1,5 -
SARAMET 10 2,4 - 5,2 10 1,5 -
SARAMET 15 1,6 12,5 4,0 5 0,5 5
SARAMET Cr 2,2 - 18,0 6 - -