::Gontermann peipers:Hi-Cr Iron Roll:

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16th September 2010

Gontermann to increase capacity

15th September 2010

Gontermann-Peipers seeks FMC nod for multi-commodity exchange

We have found GPIL to be an excellent choice for steels where chipping and cracking have not been a problem. It has worked well in applications on thinner ...

High Chromium rolls are characterized by the presence of well distributed ternary carbides of M7C3 type in the shell area which remain well distributed in a tempered upper Bainitic and Martensitic matrix. These rolls are customized as per the specific rolling mill conditions of the user.

Chemical Composition Proximate Chemical Composition [ in %- wt ]

Hi Cr Iron	Element	%C	%Si	%Mn	%P	%S	%Cr	%Ni	%Mo	% V
	Min	2.3	0.4	0.70	0.06	0.04	13	0.80	0.9090	0.00
	Max	3.0	0.8	1.20	max	max	19	1.50	1.6	0.30

Mechanical properties Mechanical Properties [1 MPa = 1 N/mm² (=0.1 kgf / mm² ) ]

Hi Cr Iron	Element	Tensile Strength of Journal (MPa)	Bending Strength of Journal (MPa)	Barrel Hardness in ShC
	min	250	375	65
	max	450	700	85

Hardness in Depth [SH C]

Physical properties Physical properties

physical properties

High compressive strength – To increase the load bearing capacity
High thermal fatigue strength – To reduce crack initiation
Higher peeling resistance of the oxide layer-To reduce rolled in scale and other such rolling defects
High wear resistance - To get a higher campaign life

Quality	Barrel Dia (mm)	Barrel Length (mm)	Total Length (mm)	Weight
Hi -Cr Iron	570 - 1200	2700 (max)	6000 (max)	22.0 MT

Composite High Chromium Iron rolls are normally used in the initial stands (F1 to F3 and at times F4) of Hot Strip Mills where the stock undergoes the maximum reduction. These centrifugally cast rolls have a high chromium content shell with a nodular iron core. Though there are a few other areas of application for these rolls like skin pass rolls in Cold Rolling Mills and initial stands of tandem mill these applications are very limited in nature.