Cold Rolled Coils In India: Cold Rolled Coils Exporters Manufacturer India

Cold Rolled steel (CR) Strips / Coils

with the growing demand of cold rolled strips and sheets, Gaurang has started manufacturing CR coils and strips in year 2003 with annual capacity of 1 lac MT annum in various sizes and thickness. On line stringent quality checks ensure the tolerances and dimension for sophisticated applications CR production plant consists of 4 HI and cold rolling mils along with bell furnaces, Skin pass, slitting, cut to length and testing facilities.

Products Range
  • CRCA strips with low carbon
  • Medium carbon steel
  • High strength low alloy steel
  • Semi Processed unalloyed electrical
  • Hot rolled oiled & picketed steel
CR Strips :

Mild Steel in drawing. Deep drawing, Extra deep drawing grades medium and high carbon, SAE 1020, if steel, High Tensile steel (SPC-370-440)

Specifications : IS 513, BS 1449, JIS G3141, IS 7226 and equivalent, SPCC, SPCD, SPCE
Strip Width : 12mm to 1120mm
Strip Thickness : 0.3mm to 3.2mm
Coil Weight : 2-17 kg/mm width
Coils Diameter: Internal 400mm & 500mm External 1700mm (max)
Cut to Length Sheet : Length 350mm width 40mm to 1250mm thickness 0.40mm to 3.2mm
Surface Finish : Bright suitable for most purpose & recommended for electro plating with light mat-surface is suitable for deep drawing and for painting. bright finish, dull finish, matt finish
CR
Surface Finish : Most of the applications are covered with this surface roughness to have trouble free
Bright/Polished: Deep drawing and lacquering operations. matt finish
  • Semi processed unalloyed electrical
  • Hot rolled oiled & & picketed steel

Manufacturing Process
The manufacturing processes utilizes the latest technology for producing high quality cold rolled steel coils and sheets. H.R. coils are procured from interpreted steel plants eg. sail. TATA and ISPAT etc to ensure the desired raw materials standard to meet stringent quality.
HR Slitter :
The pull through HR slitting line slits the rough edges of the HR coils
Pickling :
in semi continuous line surface ferrous scale of HR coils is removed with the usage of warm Hydrochloric Acid. Coil is subsequently rinsed with cold and hot water. The access water on the strips is dried at hot air blower.
Cold Rolling :
4 Hi Rolling Mill The Pickled HR coils are cold rolled to required thickness in several passes. Mills are equipped with all facilities to ensure-Closure dimensional Tolerances, shape and size
Annealing :
To attain required properties for formability, cold rolled coils are annealed in protective (non-oxidizing) nitrogen atmosphere furnaces are equipped with all required auto controls.
Skin Pass :
Skin passing of cold rolled steel coils is carried out to • Remove stretcher strain • Obtain desired finish such as mat or bright achieve flatness
CR Slitters :
By the precision slitting machines coils are slit to the required width / to cater to the diversified need of customers.
Cut to Length :
Coils are cut into sheets as per customer requirements.
Oiling :
The coils / sheets are first covered by polyethene sheet. These are covered by hessian and sheet metal packaging as per customers requirement. These are tied with steel straps to avoid any damage in handling, transportation and storage.
Packing :
The coils / sheets are first covered by polyethene sheet. These are covered by Hessian and sheet metal packaging as per customers requirement. These are tied with steel straps to avoid any damage in handling, transportation and storage.

Applications & Specification

Customized cold rolled steel sheets and strips are used for the follows applications:

  • AC & Refrigerator Industry
  • Washing Machines
  • Electrical Parts
  • Electronic Parts
  • Automobile Industry
  • Steel Furniture industry
  • Fabrication & Engineering

COLD ROLLED CLOSED ANNELED

International Standards

Grade
-
Drawing Quality
Deep Drawing Quality
Extra Deep Drawing Quality
Extra Deep Drawing Quality
Super Extra Deep Drawing Quality
(if Grade)
Specifications
15513
D
DD
EDD
-
-
-
JIS G3141
SPCD
SPCE
SPCEN
-
-
-
BS1449
CR3
CR2
CR1
-
-
-
DIN 1623
St 12.13
St. 14
-
-
-
-
ASTM*
CQ
DQ
EDDQ
-
-
-
EN 10130
FEP03
FEP03
FEP04
FEP05
FEP06

High tensile grades available as per customers specification on mutual agreement ASTM = A366/A366M /A619WA620 / A620M

 

Designation Elongation%
Min thickness range (mm)
Tensile Strength
      Test Price
-
SPCC
SPCD
SPCE
-
(34)
(36)
18
0.40 to 0.60 excl
(36)
(38)
40
0.60 to 1.0 excl
(37)
(39)
41
1.0 to 1.6 excl
(38)
40
42
-
No. 5in
Rolling
Direction

Note
1. For the intermediate nominal thickness of 0.4mm or more and 1.6mm or less which are not listed in this table, the value shall be obtained by the method of interposition and rounded off at one place of decimal.

SHALL APPLY TO THE AVERAGE OF THE VALUES OF 3 PIECES

Thickness
Tolerance
Width under
600
630 to 1,000
excl.
1,000 to 1,250
excl.
1,250 to 1,600
excl.
1,600 to and
over
Thickness          
0.30 to 0.40 excl
0.40 to 0.60 excl
0.60 to 0.80 excl
0.80 to 1.00 excl
1.00 to 1.25 excl
1.25 to 1.60 excl
1.60 to 2.00 excl
±0.04
±0.05
±0.06
±0.07
±0.08
±0.09
±0.10
±0.04
±0.05
±0.06
±0.07
±0.08
±0.10
±0.11
±0.04
±0.05
±0.06
±0.08
±0.09
±0.11
±0.12
-
±0.06
±0.07
±0.09
±0.10
±0.12
±0.14
-
-
±0.08
±0.10
±0.12
±0.14
±0.16

BS 1449 PART 1 CARBON STEEL PLATES, SHEET & STRIP

Chemical Composition Grade Chemical Composition, % Max Classification
-
CR 4
CR 3
CR 2
CR 1
C
0.12
0.10
0.08
0.08
Mn
0.60
0.50
0.45
0.45
P
0.050
0.040
0.030
0.025
S
0.050
0.040
0.035
0.030
-
Drawing Quality
Deep Drawing Quality
Extra Deep Drawing Quality
-

MECHANICAL PROPERTIES

Grade

Yield Strength

Tensile Strength

Original

Gauge Length

Lo

Bend Mandrel Diameter

-

CR4

CR3

CR2

CR1

N/mm2min

(140)

(140)

140

140

N/mm2min

(280)

(280)

280

280

50 mm

-

(34)

36

38

80 mm

-

(32)

(34)

(36)

200 mm

-

(25)

27

29

180 bend

Contact

Contact

Contact

Contact

Note
1. Tensile properties given in brackets are for guidance only and are not mandatory unless specially agreed at the time of ordering Tensile test result is not normally requested for grade CR3and
2 For material less then 1.00mm thick, the percentage elongation is reduced by 1 for each 0.25mm reduction in thickness.
3 in case of this specification the agreement between the manufacturer and the customer is prior to ordering
4 *t thickness of material

DIN 1623 PART 1 COLD ROLLED SHEET AND STRIPS FOR COLD FORMING

 

Chemical Composition, % Max

Mechanical Properties

Hardness

Max

Steel

Grade

% C

% P

% S

Tensile Strength

n/mm2

Yield Strength

N/mm2 max

Elongation%

min

HRB

HR30T

St12

St13

St14

0.10

0.10

0.08

-

-

-

-

-

-

270-410

270-370

270-350

280

240

210

28

34

38

65

55

50

60

53

50