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GPI - Product Catalogue
FORGE
GONTERMANN-PEIPERS (INDIA) LIMITED
RegdRegd.Office .Office & Works :
P.O. Pailan, Diamond Harbour Road, 24 Parganas(S),West Bengal,India, Pin : 743512
Phone : 91 33 2453-2455 / 56, 2497-8684-86 / 8294,
Fax: 91-33-2497-8547 / 8686, Website : www.gontermann-peipers.com/
Induction Hardened Alloy Forged Steel Rolls
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.
Forged rolls are also used as Work Rolls for single stand and Multi Stand cold rolling temper
mill.
• 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.
Product Information Sheet
GONTERMANN-PEIPERS (INDIA) LIMITED
RegdRegd.Office .Office & Works :
P.O. Pailan, Diamond Harbour Road, 24 Parganas(S),West Bengal,India, Pin : 743512
Phone : 91 33 2453-2455 / 56, 2497-8684-86 / 8294,
Fax: 91-33-2497-8547 / 8686, Website : www.gontermann-peipers.com/
GONTERMANN-PEIPERS (INDIA) LIMITED
Heat Treatment Capability Drop in Hardness Radial Depth
Hardening Method Work Roll Work Roll
Special Progressive type 8-10 ShD 30 mm
Induction Hardening
Intermediate Roll Intermediate Roll
‘’ 3-5 ShD 35 mm
Typical Carbide Analysis
Carbide Type Carbide Hardness Surface Area Average Diameter
HV %
M3C/M7C3 (850-1100)/(1200-1600) 5-6 0.4-1
Forged Steel Back up Roll
500 X
Nominal Chemical Composition [in %- wt] & Mechanical Properties
[1 MPa = 1 N/mm2 (=0.1 kgf / mm2 )]
Element
%C %Si %Mn %P %S %Cr %Ni %Mo
Tensile
Strength of
Journal (MPa)
Bending
Strength of
Journal (MPa)
Barrel Hardness
in ShC
Min 0.40 0.20 0.30 0.04 0.04 1.50 1.00 0.40 950 1400 55
Max 0.90 0.60 1.00 max max 5.00 max 1.40 1600 2400 70
Hardness in Depth [SH C]
7010 8020 30 40 50 6030
40
50
60
HARDNESS (in ShC)-->
DEPTH FROM SURFACE (mm)--->
70
0
GONTERMANN-PEIPERS (INDIA) LIMITED
Product Information Sheet
Forged Steel Back Up Roll
Alloy steel forged BUR are made from special quality steel manufactured from quality
raw material & ferroalloys through secondary refining& ingot pouring. The ingots are hot
forged and dehydrogenation treatment is carried out. Forged blanks are procured and
going through stringent quality inspection in macro & micro aspects and then processed
successive stages of heat treatment like homogenizing, normalizing to improve the
overall structural soundness, stress distribution uniformity & toughness. It undergoes
differential hardening process followed by mist quenching or compressed air quenching
depending on the hardness requirement upto a desired depth on barrel surface only.The
tempered roll exhibits a uniform bainitic microstructure at the shell & fine pearlitic
structure at the core /neck .
Due to the differential hardening the barrel / working area up to a critical depth only
reaches to critical temperature & hence hardened. The rest core & neck remains
unaffected resulting higher impact strength as well as strength against overload during
the rolling
The above rolls are of following applications-
•Hot & cold mills Back-Up rolls
•Continuous & Semi-Continuous hot strip mills Back-Up rolls
•Roughing 4-High stands Back-Up rolls
•Cold tandem mills Back-Up rolls
•Thick plate mill Back-Up rolls
These rolls are characterized by the following properties :
•Higher hardness penetration
•Improved Wear Resistant property - To provide higher campaign life
•Higher toughness property - To provide more resistance to spalling & fatigue
Recommendations for usage :
• After each rolling campaign the roll barrel surface should be thoroughly ground to
regain original supplied hardness. (max hardness increment of 2 ShC is allowed)
•Between these two varieties choice to be made on the basis of mill conditions as
performance superiority of forged quality roll may get deteriorated due to mill
abnormality.