Title of Invention	A METHOD OF 'T' COAT COATING ON GALVANNEALED STEEL SHEET FOR MINIMIZING POWDERING DURING PRESS FORMABILITY
Abstract	The present invention relates to a method of 'T' coat coating layer on galvannealed steel sheet for minimizing powdering during press formability comprising a 'T' coating solution of poly-manganese phosphate of 0.25% to 1%; a spray gun (1) spraying 'T' coating solution on GA sheet (2) are leveled for uniform distribution by two leveler (3,4) and excess materials are stored in a bath (9) the coated GA sheets (2) are further squeezed for uniform lamination by two rubber roller squeezer (5,6) and the 'T' coated GA sheets are dried at a temperature 40°-60°C in a hot chamber (7), subsequently 'T' GA sheets are coiled (8) in a machine or bare GA sheets are passed sequentially through first set tension leveler (3,4), fed into a bath containing 'T' coating solution passed through a second set of tension leveler (3,4) for uniform leveling of coating materials, the 'T' coated GA sheets being further squeezed by two rubber roller squeezer (5,6) for uniform lamination of coated materials and dried of the coated material at a temperature of 40°-60°C in a hot chamber (7) and coiled in a machine (8) and T-coating thickness layer formed 0.7 to 6 micrometer having coating weight 0.5-4 gm/mm and the crystal size is 6 to 15 micrometer if formed although 'T' coat is amorphous in nature characterised in that 'T' coating layer reduces the co-efficient of friction which in turn minimize the powdering during press formability.

Title of Invention

A METHOD OF 'T' COAT COATING ON GALVANNEALED STEEL SHEET FOR MINIMIZING POWDERING DURING PRESS FORMABILITY

Abstract

The present invention relates to a method of 'T' coat coating layer on galvannealed steel sheet for minimizing powdering during press formability comprising a 'T' coating solution of poly-manganese phosphate of 0.25% to 1%; a spray gun (1) spraying 'T' coating solution on GA sheet (2) are leveled for uniform distribution by two leveler (3,4) and excess materials are stored in a bath (9) the coated GA sheets (2) are further squeezed for uniform lamination by two rubber roller squeezer (5,6) and the 'T' coated GA sheets are dried at a temperature 40°-60°C in a hot chamber (7), subsequently 'T' GA sheets are coiled (8) in a machine or bare GA sheets are passed sequentially through first set tension leveler (3,4), fed into a bath containing 'T' coating solution passed through a second set of tension leveler (3,4) for uniform leveling of coating materials, the 'T' coated GA sheets being further squeezed by two rubber roller squeezer (5,6) for uniform lamination of coated materials and dried of the coated material at a temperature of 40°-60°C in a hot chamber (7) and coiled in a machine (8) and T-coating thickness layer formed 0.7 to 6 micrometer having coating weight 0.5-4 gm/mm and the crystal size is 6 to 15 micrometer if formed although 'T' coat is amorphous in nature characterised in that 'T' coating layer reduces the co-efficient of friction which in turn minimize the powdering during press formability.

Full Text	FIELD OF THE INVENTION The present invention generally relates to a method of coating a layer on galvannealed steel sheets applicable in automobile industry. More particularly, the invention relates to a method of improve coating term as 'T' coating on galvannealed steel sheets for minimizing powdering during press formability . BACKGROUND OF THE INVENTION In automobile industry, galvanneal steel sheets are generally used for its excellent corrosion resistance, good paintabihty and weldibility. In typical steel plant, steel sheets produced from billets or stabs by rolling, are then fed into a pickling solution for cleaning. The cleaned steel sheets passes through hot dip galvanise bath containing liquid zinc at temperature of 460°C ± 5°C and followed by in a annealing chamber to anneal zinc coated steel sheet at a temperature of 550-580°C to produce galvannealed steel sheets. During this period, 100% surface zinc diffuses and form a Fe-Zn alloy of different metallic phases. A galvannealed (GA) coating having weight of 50 gramme/square-milimetre/side are suitable for lasting 10 years corrosion resistance property and for lasting 5 years cosmetic corrosion resistance. Beyond this weight of GA a press formability problem arises such as powdering , caused by an increasing frictional behaviour due to presence of soft eta phase. This is the only demerit of GA observe in practice. The demerits of GA can be eliminated by (1) introduction of a intermediate layer between die and sheet, (2) optimizing GA process to maximize delta phase but due to the bnttleness of GA coating in nature, powdering was unavailable. Thus, the introduction of a intermediate layer between GA sheet and die post treatment is well appreciated. Prior Art discloses many lubricating oil of low/high molecular weight of oil chains, inorganic lubricants like borax (Na2B2O4), nickel, iron flasting and Fe-P electroplacting, polyethylene sheets as intermediate layer to reduce co-efficient of friction to minimize powdering. Prior Art further discloses a composite electroplatings like ceramic or polymetric particles as second phase on the metal for improving wear and corrosion resistance. All these post treatment layer avoid; direct contact between the GA coating and dies, thus reduces the press formability problems. A process of increase in post treated coating thickness also impairs on press formability problem and thereby restricted to 0.5 to 1.5 micron limit for better re- phosphatibility and post weldability. In present scenario, steel companies follow a common object of minimum material cost by eliminating the adoption of extra upper layer cost and on the contrary, a strong demand arises to develop a dry lubricant coating applicability on GA which are readily available within the existing facilities in the plant. Further more, the improvement of press formability has been adviced for coating for complex forming panels of completed shape including autobody outer cover. In order to overcome the prior art difficulties, the present invention envisages an introduction of a low cost material with a economical process to obtain poiymanganese phosphate coating with oil and without oil on GA steel sheet and achieved a better performance of this upper coating with respect to co-efficient of friction as compared to uncoated GA formability. OBJECT OF THE INVENTION It is therefore, an object of the present invention to propose a method of improved "T" Coating on GA steel sheet for minimizing powdering during press formability which eliminates one disadvantages of prior art. A further object of the present invention is to propose a method of improved 'T' Coating on GA steel sheet for minimizing powdering during press formability which is easy to access in production process arid the coating materials lasts for a long period. A still further object of the present invention is to propose a method of improved 'T' Coating on GA steel sheet for minimizing powdeeing during press formability which imparts in increasing corrosion resistance, payability and weldability and impart in decreasing co-efficient of friction An yet further object of the present invention if to propose a method of improved 'T' Coating on GA steel sheet for minimizing powdering during press formability which provides cost economy. BRIEF SUMMARY OF THE INVENTION Galvanneal steel sheets are fed into a degreasing bath inorder to remove oil, dirts etc. from the surface. Then, the T' Coating solution is applied on the GA sheets surface by spraying or the GA steel she its are immersed in bath containing 'T' Coating solution. Gas steel sheet with 'T' Coating adherence are then rubber squeezed and send to chamber for drying at a temperature of 40°- 60°C. The 'T' Coated GA sheet thus obtained were characterized with respect to co-efficient of friction, powdering resistance, coating uniformity,coating weight and organic molecular net work in the coating. Powdering resistance properties of the 'T' coated sheets were evaluated in Double Olsen equipment as per Chrysler procedure i.P-461 H-120 (Roeil Amster, BUP-200, Germany instrument). It was observed that the powdering index of bare GA and conventional phosphated GA was 2, where as in case of 'T' coated, the powdering index was only 1.7. From quantitative measurement of powdering, it was found that the treated GA of substrate thickness 0.7 showed 6.2 mg Fe powder compared to untreated GA of same substrate thickness showed 18 mg Fe powder. The coating uniformity, organic molecular network in the coating were checked through scanning electron microscope (SEM), it was observed that coating was found uniform through out the surface and molecular net work was act as a lubricant for improving coefficient of friction It was found that coefficient of friction reduced from 2.5 to 0.11 of 0.7 mm substrate thickness of GA samples. BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS Figure. 1- shows a schematic diagram of a process of T 'Coating by spray technique. Figure.2- shows a schematic diagram of a process of T' coating by immersion technique. Figure.3- shows a sectional view of a small pince of GA sheet coated with 7 'Coating before forming. Figure.4- shows a sectional view of a small piece of GA sheet coated with 7' Coating after forming. DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION As shown in Figure.1 A 'T' Coating solution containing 0,25% to 1% poly manganese phosphate are sprayed from a spray gun(i) on a moving bare GA sheet (2). For uniform coating solution leveling the GA sheet are passed through two laveller (3,4) and excess solution fall on a bath (9) placed beneath the spray gun (1) the moving GA sheet coated with (t) coating solution are further squeezed by means of two rubber rollers (5.6). After passing from rubber squeezer, the laminated 7' Coated GA sheet are feci in a heat chamber (7) for drying at a temperature of 40º-60°C. After drying the sheets are coiled (8) . As shown in Figure. 2- Bare GA sheet (2) is passed through a first tension leveler (3,4) and then immerse in bath (9) containing 7' Coat solution. After coating adherence, the GA sheet is passed again through a second tension leveler for uniform lamination of coated material. The GA sheet further passes through two rubber squeezers (5,6) for better adherence of coating material. The 7' Coated GA sheets are then fed to a chamber for drying at a temperature of 40°-60°C. The dried sheet are coiled in a machine (8). As shown in Figure.3- A sectional view of a small T' coated GA sheet before forming operation. The first layer contains oil (10) and the second layer contains T coating material of polymanganese phosphate (11) and the third layer is GA substrate (12). T-coating thickness layer formed 0.7 to 6 micrometer having coating weight 0.5-4 gm/sq.m and the crystal size is 6 to 15 micrometer if formed although T' coat is amorphous in nature. As shown in Figure.4- A sectional view of a small T' coated GA sheet after forming operation during forming operation, P04-layer acting as lubricating powder (13) on the upper surface of the GA sheet and MnPO4-layer preventing sticking (14) at the bottom layer of GA sheet (12). WE CLAIM 1. A method of T-coal coating layer on galvannealed steel sheet for minimizing powdering during press formability comprising: - a 'T' coating solution of poly-manganese phosphate of 0.25% to 1%; - a spray gun (1) spraying T coating solution on GA sheet (2) are leveled for uniform distribution by two leveler (3,4) and excess materials are stored in a bath (9) the coated GA sheets (2) are further squeezed for uniform lamination by two rubber roller squeezer (5,6) and the 'T' coated GA sheets are dried at a temperature 40°-60°C in a hot chamber (7), subsequently T' GA sheets are coiled (8) in a machine or; - bare GA sheets are passed sequentially through first set tension leveler (3,4), fed into a bath containing T coating solution passed through a second set of tension leveler (3,4) for uniform leveling of coating materials, the T' coated GA sheets being further squeezed by two rubber roller squeezer (5,6) for uniform lamination of coated materials and dried of the coated material at a temperature of 40°-60°C in a hot chamber (7) and coiled in a machine (8); - T-coating thickness layer formed 0.7 to 6 micrometer having coating weight 0.5-4 gm/sq.m and the crystal size is 6 to 15 micrometer if formed although T coat is amorphous in nature. Characterised in that T' coating layer reduces the co-efficient of friction which in turn minimize the powdering during press formability. 2. A method of T' coating layer on GA steel sheets for minimizing powdering during press formability as substantially described and illustrated here in with reference to accompanying drawings. The present invention relates to a method of 'T' coat coating layer on galvannealed steel sheet for minimizing powdering during press formability comprising a 'T' coating solution of poly-manganese phosphate of 0.25% to 1%; a spray gun (1) spraying 'T' coating solution on GA sheet (2) are leveled for uniform distribution by two leveler (3,4) and excess materials are stored in a bath (9) the coated GA sheets (2) are further squeezed for uniform lamination by two rubber roller squeezer (5,6) and the 'T' coated GA sheets are dried at a temperature 40°-60°C in a hot chamber (7), subsequently 'T' GA sheets are coiled (8) in a machine or bare GA sheets are passed sequentially through first set tension leveler (3,4), fed into a bath containing 'T' coating solution passed through a second set of tension leveler (3,4) for uniform leveling of coating materials, the 'T' coated GA sheets being further squeezed by two rubber roller squeezer (5,6) for uniform lamination of coated materials and dried of the coated material at a temperature of 40°-60°C in a hot chamber (7) and coiled in a machine (8) and T-coating thickness layer formed 0.7 to 6 micrometer having coating weight 0.5-4 gm/mm and the crystal size is 6 to 15 micrometer if formed although 'T' coat is amorphous in nature characterised in that 'T' coating layer reduces the co-efficient of friction which in turn minimize the powdering during press formability.

Full Text

FIELD OF THE INVENTION
The present invention generally relates to a method of coating a layer on
galvannealed steel sheets applicable in automobile industry. More particularly,
the invention relates to a method of improve coating term as 'T' coating on
galvannealed steel sheets for minimizing powdering during press formability .
BACKGROUND OF THE INVENTION
In automobile industry, galvanneal steel sheets are generally used for its
excellent corrosion resistance, good paintabihty and weldibility. In typical steel
plant, steel sheets produced from billets or stabs by rolling, are then fed into a
pickling solution for cleaning. The cleaned steel sheets passes through hot dip
galvanise bath containing liquid zinc at temperature of 460°C ± 5°C and followed
by in a annealing chamber to anneal zinc coated steel sheet at a temperature of
550-580°C to produce galvannealed steel sheets. During this period, 100%
surface zinc diffuses and form a Fe-Zn alloy of different metallic phases. A
galvannealed (GA) coating having weight of 50 gramme/square-milimetre/side
are suitable for lasting 10 years corrosion resistance property and for lasting 5
years cosmetic corrosion resistance. Beyond this weight of GA a press formability
problem arises such as powdering , caused by an increasing frictional behaviour
due to presence of soft eta phase. This is the only demerit of GA observe in
practice.
The demerits of GA can be eliminated by (1) introduction of a intermediate layer
between die and sheet, (2) optimizing GA process to maximize delta phase but
due to the bnttleness of GA coating in nature, powdering was unavailable. Thus,
the introduction of a intermediate layer between GA sheet and die post
treatment is well appreciated.
Prior Art discloses many lubricating oil of low/high molecular weight of oil chains,
inorganic lubricants like borax (Na2B2O4), nickel, iron flasting and Fe-P
electroplacting, polyethylene sheets as intermediate layer to reduce co-efficient
of friction to minimize powdering.
Prior Art further discloses a composite electroplatings like ceramic or polymetric
particles as second phase on the metal for improving wear and corrosion
resistance. All these post treatment layer avoid; direct contact between the GA
coating and dies, thus reduces the press formability problems.
A process of increase in post treated coating thickness also impairs on press
formability problem and thereby restricted to 0.5 to 1.5 micron limit for better re-
phosphatibility and post weldability. In present scenario, steel companies follow
a common object of minimum material cost by eliminating the adoption of extra
upper layer cost and on the contrary, a strong demand arises to develop a dry
lubricant coating applicability on GA which are readily available within the
existing facilities in the plant.
Further more, the improvement of press formability has been adviced for coating
for complex forming panels of completed shape including autobody outer cover.
In order to overcome the prior art difficulties, the present invention envisages an
introduction of a low cost material with a economical process to obtain
poiymanganese phosphate coating with oil and without oil on GA steel sheet and
achieved a better performance of this upper coating with respect to co-efficient
of friction as compared to uncoated GA formability.
OBJECT OF THE INVENTION
It is therefore, an object of the present invention to propose a method of
improved "T" Coating on GA steel sheet for minimizing powdering during press
formability which eliminates one disadvantages of prior art.
A further object of the present invention is to propose a method of improved 'T'
Coating on GA steel sheet for minimizing powdering during press formability
which is easy to access in production process arid the coating materials lasts for
a long period.
A still further object of the present invention is to propose a method of improved
'T' Coating on GA steel sheet for minimizing powdeeing during press formability
which imparts in increasing corrosion resistance, payability and weldability and
impart in decreasing co-efficient of friction
An yet further object of the present invention if to propose a method of
improved 'T' Coating on GA steel sheet for minimizing powdering during press
formability which provides cost economy.
BRIEF SUMMARY OF THE INVENTION
Galvanneal steel sheets are fed into a degreasing bath inorder to remove oil,
dirts etc. from the surface. Then, the T' Coating solution is applied on the GA
sheets surface by spraying or the GA steel she its are immersed in bath
containing 'T' Coating solution. Gas steel sheet with 'T' Coating adherence are
then rubber squeezed and send to chamber for drying at a temperature of 40°-
60°C. The 'T' Coated GA sheet thus obtained were characterized with respect to
co-efficient of friction, powdering resistance, coating uniformity,coating weight
and organic molecular net work in the coating.
Powdering resistance properties of the 'T' coated sheets were evaluated in
Double Olsen equipment as per Chrysler procedure i.P-461 H-120 (Roeil Amster,
BUP-200, Germany instrument). It was observed that the powdering index of
bare GA and conventional phosphated GA was 2, where as in case of 'T' coated,
the powdering index was only 1.7. From quantitative measurement of
powdering, it was found that the treated GA of substrate thickness 0.7 showed
6.2 mg Fe powder compared to untreated GA of same substrate thickness
showed 18 mg Fe powder.
The coating uniformity, organic molecular network in the coating were checked
through scanning electron microscope (SEM), it was observed that coating was
found uniform through out the surface and molecular net work was act as a
lubricant for improving coefficient of friction It was found that coefficient of
friction reduced from 2.5 to 0.11 of 0.7 mm substrate thickness of GA samples.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Figure. 1- shows a schematic diagram of a process of T 'Coating by spray
technique.
Figure.2- shows a schematic diagram of a process of T' coating by immersion
technique.
Figure.3- shows a sectional view of a small pince of GA sheet coated with 7
'Coating before forming.
Figure.4- shows a sectional view of a small piece of GA sheet coated with 7'
Coating after forming.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE
INVENTION
As shown in Figure.1 A 'T' Coating solution containing 0,25% to 1% poly
manganese phosphate are sprayed from a spray gun(i) on a moving bare GA
sheet (2). For uniform coating solution leveling the GA sheet are passed through
two laveller (3,4) and excess solution fall on a bath (9) placed beneath the spray
gun (1) the moving GA sheet coated with (t) coating solution are further
squeezed by means of two rubber rollers (5.6). After passing from rubber
squeezer, the laminated 7' Coated GA sheet are feci in a heat chamber (7) for
drying at a temperature of 40º-60°C. After drying the sheets are coiled (8) .
As shown in Figure. 2- Bare GA sheet (2) is passed through a first tension leveler
(3,4) and then immerse in bath (9) containing 7' Coat solution. After coating
adherence, the GA sheet is passed again through a second tension leveler for
uniform lamination of coated material. The GA sheet further passes through two
rubber squeezers (5,6) for better adherence of coating material. The 7' Coated
GA sheets are then fed to a chamber for drying at a temperature of 40°-60°C.
The dried sheet are coiled in a machine (8).
As shown in Figure.3- A sectional view of a small T' coated GA sheet before
forming operation. The first layer contains oil (10) and the second layer contains
T coating material of polymanganese phosphate (11) and the third layer is GA
substrate (12). T-coating thickness layer formed 0.7 to 6 micrometer having
coating weight 0.5-4 gm/sq.m and the crystal size is 6 to 15 micrometer if
formed although T' coat is amorphous in nature.
As shown in Figure.4- A sectional view of a small T' coated GA sheet after
forming operation during forming operation, P04-layer acting as lubricating
powder (13) on the upper surface of the GA sheet and MnPO4-layer preventing
sticking (14) at the bottom layer of GA sheet (12).
WE CLAIM
1. A method of T-coal coating layer on galvannealed steel sheet for
minimizing powdering during press formability comprising:
- a 'T' coating solution of poly-manganese phosphate of 0.25% to 1%;
- a spray gun (1) spraying T coating solution on GA sheet (2) are leveled
for uniform distribution by two leveler (3,4) and excess materials are
stored in a bath (9) the coated GA sheets (2) are further squeezed for
uniform lamination by two rubber roller squeezer (5,6) and the 'T' coated
GA sheets are dried at a temperature 40°-60°C in a hot chamber (7),
subsequently T' GA sheets are coiled (8) in a machine or;
- bare GA sheets are passed sequentially through first set tension leveler
(3,4), fed into a bath containing T coating solution passed through a
second set of tension leveler (3,4) for uniform leveling of coating
materials, the T' coated GA sheets being further squeezed by two rubber
roller squeezer (5,6) for uniform lamination of coated materials and dried
of the coated material at a temperature of 40°-60°C in a hot chamber (7)
and coiled in a machine (8);
- T-coating thickness layer formed 0.7 to 6 micrometer having coating
weight 0.5-4 gm/sq.m and the crystal size is 6 to 15 micrometer if formed
although T coat is amorphous in nature.
Characterised in that T' coating layer reduces the co-efficient of friction
which in turn minimize the powdering during press formability.
2. A method of T' coating layer on GA steel sheets for minimizing powdering
during press formability as substantially described and illustrated here in
with reference to accompanying drawings.

The present invention relates to a method of 'T' coat coating layer on
galvannealed steel sheet for minimizing powdering during press formability
comprising a 'T' coating solution of poly-manganese phosphate of 0.25% to 1%;
a spray gun (1) spraying 'T' coating solution on GA sheet (2) are leveled for
uniform distribution by two leveler (3,4) and excess materials are stored in a
bath (9) the coated GA sheets (2) are further squeezed for uniform lamination by
two rubber roller squeezer (5,6) and the 'T' coated GA sheets are dried at a
temperature 40°-60°C in a hot chamber (7), subsequently 'T' GA sheets are
coiled (8) in a machine or bare GA sheets are passed sequentially through first
set tension leveler (3,4), fed into a bath containing 'T' coating solution passed
through a second set of tension leveler (3,4) for uniform leveling of coating
materials, the 'T' coated GA sheets being further squeezed by two rubber roller
squeezer (5,6) for uniform lamination of coated materials and dried of the coated
material at a temperature of 40°-60°C in a hot chamber (7) and coiled in a
machine (8) and T-coating thickness layer formed 0.7 to 6 micrometer having
coating weight 0.5-4 gm/mm and the crystal size is 6 to 15 micrometer if formed
although 'T' coat is amorphous in nature characterised in that 'T' coating layer
reduces the co-efficient of friction which in turn minimize the powdering during
press formability.

Documents:

00749-kol-2006 abstract.pdf

00749-kol-2006 assignment.pdf

00749-kol-2006 claims.pdf

00749-kol-2006 correspondence others.pdf

00749-kol-2006 description (complete).pdf

00749-kol-2006 drawings.pdf

00749-kol-2006 form-1.pdf

00749-kol-2006 form-2.pdf

00749-kol-2006 form-3.pdf

00749-kol-2006-correspondence-1.1.pdf

00749-kol-2006-form-9.pdf

749-KOL-2006-(05-12-2011)-FORM-27.pdf

749-KOL-2006-ABSTRACT-0.1.pdf

749-KOL-2006-ABSTRACT-1.1.pdf

749-KOL-2006-CANCELLED DOCUMENT.pdf

749-KOL-2006-CLAIMS-0.1.pdf

749-KOL-2006-CLAIMS-1.1.pdf

749-KOL-2006-DESCRIPTION COMPLETE-1.1.pdf

749-KOL-2006-DRAWINGS.pdf

749-KOL-2006-FORM 1-1..pdf

749-KOL-2006-FORM 2-1.1.pdf

749-KOL-2006-OTHERS.pdf

749-KOL-2006-PETITION UNDER RULE 137.pdf

749-KOL-2006-REPLY TO EXAMINATION REPORT.pdf

749-kol-2006granted-abstract.pdf

749-kol-2006granted-claims.pdf

749-kol-2006granted-correspondence.pdf

749-kol-2006granted-description (complete).pdf

749-kol-2006granted-drawings.pdf

749-kol-2006granted-examination report.pdf

749-kol-2006granted-form 1.pdf

749-kol-2006granted-form 18.pdf

749-kol-2006granted-form 2.pdf

749-kol-2006granted-form 3.pdf

749-kol-2006granted-gpa.pdf

749-kol-2006granted-reply to examination report.pdf

749-kol-2006granted-specification.pdf

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Patent Number

235151

Indian Patent Application Number

749/KOL/2006

PG Journal Number

19/2010

Publication Date

07-May-2010

Grant Date

07-May-2010

Date of Filing

26-Jul-2006

Name of Patentee

TATA STEEL LIMITED

Applicant Address

RESEARCH AND DEVELOPMENT AND SCIENTIFIC SERVICES DIVISION, JAMSHEDPUR

Inventors:

#	Inventor's Name	Inventor's Address
1	TAPAN KUMAR ROUT, R&D	RESEARCH & DEVELOPMENT FLAT PRODUCT TECH. GROUP COLD ROLLING MILL, TATA STEEL LIMITED JAMSHEDPUR 831001
2	H K PRADHAN	RESEARCH & DEVELOPMENT FLAT PRODUCT TECH. GROUP COLD ROLLING MILL, TATA STEEL LIMITED JAMSHEDPUR 831001
3	NIKHILESH BANDYOPADHYAY	RESEARCH & DEVELOPMENT FLAT PRODUCT TECH. GROUP COLD ROLLING MILL, TATA STEEL LIMITED JAMSHEDPUR 831001
4	AVTAR SINGH SAINI	RESEARCH & DEVELOPMENT FLAT PRODUCT TECH. GROUP COLD ROLLING MILL, TATA STEEL LIMITED JAMSHEDPUR 831001
5	N RAJESH	RESEARCH & DEVELOPMENT FLAT PRODUCT TECH. GROUP COLD ROLLING MILL, TATA STEEL LIMITED JAMSHEDPUR 831001
6	T. VENUGOPALAN	RESEARCH & DEVELOPMENT FLAT PRODUCT TECH. GROUP COLD ROLLING MILL, TATA STEEL LIMITED JAMSHEDPUR 831001

PCT International Classification Number

C23C 2/00

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA