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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 ...

The materials of these rolls belong to the generic tool steel family and are generally alloyed with Cr, Mo, V & W. The presence of finely dispersed MC type primarily carbides along with M6C, M2C & M7C3 type carbides in a tempered martensitic matrix provides the working layer with a highly wear resistant surface. The presence of finely distributed MC type globular carbides reduce the crack propagation to a very large degree.

Chemical Composition Proximate Chemical Composition [ in %- wt ]

Alloy Forged Steel Roll	Element	%C	%Si	%Mn	%P	%S	%Cr	%Ni	%Mo	% V
	Min	0.70	0.25	0.30	0.025	0.008	1.7	1.0	1.0	0.01
	Max	1.00	0.80	0.80	max	max	5.5	max	max	0.15

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

Alloy Forged Steel Roll	Element	Tensile Strength of Journal (MPa)	Bending Strength of Journal (MPa)	% Elongation of Journal	Work Roll Barrel Hardness in ShD, JIS	Intermediate Roll Barrel Hardness in ShD, JIS
	min	900	1350	10.0	90	70
	max	1000	1700	18.0	100	80

Hardness in Depth [SH C]

Physical properties Physical properties

physical properties

To achieve the above properties, Forged Steel blanks undergo a series of stringent Heat- Treatment process consisting of Homogenizing, Spherodising, Normalizing or Volume Hardening (depending on the process requirements) & polymer Quenching & Stress relieving to minimize internal stresses
This is followed by low frequency Induction Hardening and post Induction Hardening Tempering (in a re-circulation furnace) to ensure barrel hardness in the range of 90 to 100 Sh D, JIS (which corresponds to 800-850 LE)
For further stabilizing the microstructure the induction hardened rolls are subjected to “Sub-Zero Treatment” by quenching in liquid nitrogen
Throughout the manufacturing process stringent process control measures are adopted to ensure specified quality requirements.

Quality	Usage Area	Barrel Dia(mm)	Barrel Length (mm)	Total Length (mm)	Weight
Forged Rolls	CRM-WR/IMR	240 -610	2000 (max)	5000 (max)	0.6-7.5 MT

Alloy Forged Rolls are generally used as Work Rolls for 4 High Tandem Cold Rolling Mills, Work Rolls & Intermediate Rolls for 6 High Reversing & Tandem Cold Rolling Mills .