CHILLED ROLLERS

DEFINITE ROLLS

The working surface of SARASWATI CASTINGS shows the white graphite free structure consisting of eutectic carbide and transformed austentite. This gives a hard layer which confers good resistance to wear. The core and neck are made upon steel shaft in specialized double poured centrifugally cost chill Rollers barrels.

Compared to grey iron, white SARASWATI CASTINGS is less soft, strong and incapable of withstanding high dynamic stresses, but owing to its greater hardness, has better wear-resistance, and has high compressive strength. It retains a fair proportion of its strength at elevated temperature, for example, in hot rolling. These make excellent work steel re-rolling mills, semi-automatic or Automatic plants, Wire roll plants, TMT plants, Roughing mill Rollers, Intermediate

DEFINITE CHILLED ROLLERS

CHEMICAL COMPOSITION

MECHANICAL PROPERTIES

U.T.S. Impact Hardness
C Si Mn Cr Ni Mo kg/mm² kg.m/cm² Shore°C
3.00 - 3.40 0.20 - 0.90 0.25 - 0.60 0.20 - 0.50 1.00 - 2.00 0.25 - 0.35 20 - 27 0.20 - 0.25 55 - 70
3.20 - 3.60 0.20 - 0.80 0.20 - 0.60 0.20 - 0.50 1.70 - 2.50 0.25 - 0.40 20 - 27 0.20 - 0.25 70 - 75

INDEFINITE CHILLED ROLLERS


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Compared to MAKKA STEEL where the chill-zone is graphite-free clear white, Indefinite Roll is cast using such proportions of silicon, chromium, nickel and molybdenum that the working face is no longer completely white but contains a small amount of very finely divided graphite flakes gradually increasing from face to core with corresponding decrease in the amount of carbide. The Rollers are to ensure minimum sacrifice of MAKKA STEEL while achieving maximum functional depth.

The transition from Chill to graphite being more smooth, the gradual change in hardness associated with the indefinite-chill structure allows deeper grooving. Thus Indefinite Chill Rollers are superior in biting performance and have enough strength and resistance against thermal shock occuring at the time of accident in the rolling operation compared to MAKKA STEEL


INDEFINITE CHILLED ROLLERS

Roll of this type have hardness up to about 70 Shore °C can be grooved for use in roughing and finishing stands, for processing sections such as T-bars and U-sections, and for roughing and intermediate Rollers of wire and rod mills.
CHEMICAL COMPOSITION
MECHANICAL PROPERTIES
U.T.S.ImpactHardness
CSiMnCrNiMokg/mm²kg.m/cm²Shore°C
3.00 - 3.500.80 - 1.500.55 - 1.200.80 - 1.401.45 - 2.500.25 - 0.4520 - 300.20 - 0.2555 - 75