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COLD ROLLEDSTEEL SHEET
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Cold rolled steel sheets offer a variety of outstanding properties,
including easy formability and a smooth, clean surface, and
are used in automobiles, appliances, furniture, and many other
everyday items.
JFE Steel Corporation who holds ISO9001, QS-9000 and
ISO14001 certi cations, produces a full range of cold rolled
products for these and other applications. Because strict quality
requirements are now applied to meet the needs of improved
product functions, JFE has adopted an integrated quality control
system. Customer requirements are re ected in products from
the quality design stage in order to supply customers with the
optimum material for each application in a timely manner.
Based on a wealth of experience and an advanced production
system, JFE is continuing to develop new technologies and
products which meet the needs of the times.
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Cold rolled steel sheet Contents
Characteristics
Superior workability
JFEs cold rolled products have excellent formabilityand minimal deviation in mechanical properties
thanks to the companys accumulated technicalexpertise, newly constructed and modernizedfacilities and innovative technologies, and integratedquality control system extending from raw materialsto the nal product.
Superior surface quality and dimensional accuracyM o d e r n f a c i l i t i e s , a d v a n c e d o p e r a t i o n a ltechnologies, strict inspection, and integrated qualitycontrol ensure excellent surface quality. Dimensional
accuracy is guaranteed by an automatic thicknesscontrol system using advanced numerical models.
Wide range of product standardsJFE produces cold rolled products to meet a widerange of product standards, including JIS and otherpublic standards, as well as internal JFE standards.Products range from general use, including extradeep drawing quality and bake hardening sheets, tohigh strength sheets and sheets for enameling andother special applications.
Wide range of sizesT h e a v a i l a b l e s i z e r a n g eincludes thickness from 0.14mm
to 3.2 mm and width up to1,850mm.
Superior shapeA p p l y i n g t e n s i o n l e v e l e rensures superior strip atness.
Outstanding technical serviceTo meet the requirementsof diverse clients, JFE has
established a complete technicalservicing system with advisesclients on questions rangingfrom material properties toprocessing technologies.
Manufacturing process 2
Correspondence with JFE standards to public standards 4
Product Standards, Characteristics and Application 5
JFE Standards 8
Dimensional and shape tolerances 18
Available product size range 20
Surface nish and strip edge 24
Packaging and labeling 25
Remarks on product use and handling precautions / Instructions for ordering 26
(Appendix) Extracts from Japanese Industrial Standard (JIS) ( 1 ) 27
(Appendix) Extracts from Japanese Industrial Standard (JIS) ( 2 ) 28
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Blast furnace
L i m e s t o n e
C o
k e
I r o n o r e
Converter
Vacuum degasser
Reheating furnace
Continuous caster Scale breaker Rougher Finishing train
Pickling line Continuous cold strip mill
Electrolytic cleaning line
Box annealing
Open coil annealing
Cold rolled coil (As-rolled)
Skinpass mill
Continuous annealing line
Shearing line
Recoiling line
Cold rolledslit coil
Cold rolled coil
Cold rolled coil
Cold rolled sheet
Fully continuous cold strip mill Continuous annealing line
Skinpass mill
3
M a n u
f a c t u r i n g p r o c e s s
Manufacturing process
Cold rollingThe thickness accuracy of cold rolledproducts is determined by the coldrolling process. Rolling force and striptension are computer-controlled tominimize thickness deviations duringrolling, based on measurements ofthe strip thickness at the entry anddelivery sides of the mill.
AnnealingThe formability of products is determined by annealing.Because cold rolling signi cantly increases materialhardness, making forming dif cult, annealing is performedto improve ductility by inducing a recrystallized structurein the steel. As the annealing process, coils are piled andcovered by the box and annealed and this is called thebatch annealing. The other is the continuous annealingprocess, in which coils are continuously treated. JFEuses two annealing technologies, depending on productrequirements.JFE is among the worlds leaders in process technologyfor the continuous annealing line (CAL), and has alsoused the CAL to develop a wide range of new products,from 1500N/mm 2 high strength steel to non-aging extradeep drawing grade. JFEs advanced CALs are highlycomputerized and feature automatic quality assuranceequipment, such as an automatic surface inspection devicewhich was developed by JFE.
Skinpass rollingAnnealed coils are lightly rolled by the skinpass mill toprevent a defect called stretcher strain, improve strip shape,and adjust mechanical properties. Skinpass rolling is alsoused to produce dull nish and bright nish products.
FinishingAfter skinpass rolling, coils are processed at the recoilingline, where they are cut to produce product coils of thespeci ed weight, or at the shearing line, where they are cutto sheets of the speci ed dimensions. Product thickness,width, shape, and surface quality are inspected, andmechanical properties are tested using specimens taken atthe nishing line.
CleaningRolling oil on the cold rolled strip isburned off during annealing, whichis the next process after cold rolling.Other types of rolling oil are removedby electrolytic cleaning prior toannealing. In particular, electrolyticcleaning is used with products whichrequire a clean surface to ensure goodpaintability .
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4
C or r e
s p on
d en
c ewi t h
J F E
s t an
d ar d
s t o p u b l i c
s t an
d ar d
s
Correspondence with JFE standards to public standards
Classi cationJFE
standardJIS ASTM Others
Steel sheets for general usesJFE-CCJFE-CDJFE-CE
G3141 SPCCSPCDSPCE
A109A1008
BS 1449 Part 1DIN1623 -2BS EN 10130DIN EN 10130BS EN 10139DIN EN 10139
High strength steel sheets JFE-CA G3135 SPFCA980
A1008
Atmospheric corrosionresistance steel sheets
JFE-CCUP G3125 SPA-C A 606BS EN 10155DIN EN 10155
Corrosion resistancesteel sheets
JFE-ASA
Steel sheets forporcelain enameling
JFE-CPE G3133 SPP A 424BS EN 10209DIN EN 10209
Steel sheets forelectric wire sheath
JFE-HWD
Steel sheets for galvanizing JFE-HKT
Steel sheets without annealing JFE-CNA
Steel sheets in h igh temperatureatmosphere
JFE-CHCR
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5
P r o
d u c
t S t a n
d a r d s ,
C h a r a c t e r i s t
i c s a n
d A p p
l i c a
t i o n
JFE Steel is producing wide range of products which have excellent characteristics based on thepublic standards like Japanese Industrial Standard(JIS) to original JFE standard, at the East JapanWorks (Chiba and Keihin plants) and the West Japan Works (Fukuyama and Kurashiki plants).
Product Standards, Characteristics and Application
Public Standard ProductsJFE Steel is producing products based on following public standards.
Japanese Industrial Standard (JIS)
The Japan Iron and Steel Federation Standard (JFS)
Classi cation Designation Characteristics and Application
G 3141Cold-reduced carbon steel sheets
and stripSPCC SPCC-T
SPCD SPCE SPCEN
Best suited for automobiles, electrical appliances, etc.due to wider workable ranges from commercial todeep drawing qualities.
G 3135Cold rolled high strength steel
sheets with improved formabilityfor automobile structure use
SPFCSPFC***YSPFC***H
Mainly used for automobiles due to high strength andimproved formability.
G 3125Superior atmospheric corrosion
resisting rolled steelsSPA-C
Best suited for rolling stock bodies or constructionsdue to superior atmospheric corrosion resistance.
Classi cation Designation Characteristics and Application
A 2001Cold rolled steel sheets for
automobile useJSC
Specifying cold rolled steel products for automobileuse (General use to high strength steel)
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7
P r o
d u c
t S t a n
d a r d s ,
C h a r a c
t e r i s
t i c s a n
d A p p
l i c a
t i o n
JFE Standard ProductsJFE Steel is producing cold rolled steel sheets for general use, high strength steel sheets and cold rolledsteel sheets for special use based on JFE standards.
Cold rolled steel sheets for general use
Cold rolled high strength steel sheets
Classi cation Designation Pages Characteristics and Application
Commercial quality JFE-CC
8 9
JFE produces six grades of cold rolled soft steelproducts, ranging from commercial quality JFE-CC(equivalent to JIS-SPCC) to extra deep drawingquality JFE-CG, which is superior to JIS-SPCEN, andultra deep drawing quality JFE-CGX, which features
an extremely high plastic strain ratio (mean r-value).
JFE also produces two grades of bake handenable(BH) cold rolled steel products which have aincreased yield point during baking after painting.
Drawing quality JFE-CD
Deep drawing quality 1 JFE-CE
Deep drawing quality 2 JFE-CF
Extra deep drawing quality JFE-CG
Ultra deep drawing quality JFE-CGX
Bake hardenability quality JFE-CEH
Deep drawing qual i ty wi th bakehardenability
JFE-CGH
Cold rolled steel sheets for special use
Classi cation Designation PagesTensile Strength ( N/mm 2 )
Characteristics Application forautomobile340 370 390 440 490 540 590 780 980 1180 1370 1470
Commercial quality JFE-CA
10 13
Suitable for general processing like drawing or bending. Applying the water-quenching by acontinuous annealing process, maximum 1 ,470 N/mm 2 tensile strength is available.
StructureReinforce
Deep drawing qual i tywith bake hardenability JFE-CA
H Superior in deep drawability and bake-hardening. Suitable for outer parts of automobileswhich require anti-dent properties.
Outer panel
Drawing quality JFE-CA F Superior ductility and suitable to drawing application.Outer panelInner part
D eep dra win g q ua lit y J FE -C A P Having excellent ductility and high r-value, suitable materials for deep drawing. Outer panel
Inner part
E x t ra d e e p d ra wi n gquality JFE-CA
G Adding excellent r-value and ductility with attaining super ne grain structure, suitablematerials for extra deep drawing because of having good secondary-embrittlementresistance.
Outer panelInner part
High stretch angeformability quality JFE-CA
SF Having excellent ductility and high stretch ange formability, suitable for drawing with angeexpansion forming.
StructureReinforce
Low yield ratio qualitytype 1 JFE-CA
Y1 Having excellent ductility and high work hardening coef cient, suitable material for deepdrawing processing.
StructureReinforceLow yield ratio quality
type 2 JFE-CAY2
High e longat ion quali ty JFE-CA A Applying TRIP (Transformation Induced Plasticity) effects, excellent ductility and workhardening coef cient are achieved at the high strain range.
StructureReinforce
Classi cation Designation Pages Characteristics and Application
Cold rolled steel sheetsfor porcelain enameling JFE-CPE
14 Chemical compositions are adjusted for porcelain enameling use.General use or deep drawing, 1 -coat or 2 -coat usages are available.
Cold rolled steel sheetsfor electric wire sheath JFE-CWD
15 Products especially developed for electric wire sheathing. Superiorfor welding and working.
Cold rolled steel sheetsfor galvanizing JFE-CKT
15 Annealed cold-rolled sheet as the mother material for galvanizing isavailable.
Cold rolled steel sheetswithout annealing JFE-CNA
16 Non-annealed cold-rolled sheet of thinner gages are available.Suitable for application needed strength without forming.
Cold rolled corrosion
resistance steel sheetsJFE-ASA 16
Having superior resistance against sulfuric acid corrosion andatmospheric corrosion. Suitable to the air pre-heater of boilers, heatexchangers, chemical plants and exhaust chambers.
Cold rolled atmosphericcorrosion resistance high
strength steel sheetsJFE-CCUP 17 Having the superior corrosion resistance without painting due to thestable oxide lm. Suitable to rolling stock bodies and structures.
Cold rolled steel sheetsin high temperature
atmosphereJFE-CHCR 17
Having superior anti-oxidation properties and keeping strength underhigh temperature( 450 -600 C). Suitable to application like chimneyducts, needed heat resistance and workability.
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9
J F E S t a n
d a r d s
Mechanical Properties
Dimensional toleranceSize tolerances conform JIS G 3141(Cold-reduced carbon steel sheets and s trip). Refer to page 18.
Cold rolled steel sheets for general use JFE-CJFE produces six grades of cold rolled soft steel products, according to formability, ranging fromcommercial quality JFE-CC (equivalent to JIS-SPCC) to extra deep drawing quality JFE-CG, which issuperior to JIS-SPCEN, and ultra deep drawing quality JFE-CGX, which features an extremely highplastic strain ratio (mean r-value). JFE also produces two grades of bake- hardening (BH) cold rolledsheets, which display yield point increase when baked after painting. Ultra deep drawing
Extra deep drawing
Deep drawing 2
Deep drawing 1
Drawing
Thickness : 0.8mm
2.5
2.0
1.5
40 50 60Elongation (%)
A v e r a g e p
l a s t i c s t r a
i n r a
t i o
( M e a n r - v a l u e
) Extra deep drawing Ultra deep drawing
Available product size rangeThe available size range is shown on page 20.
Automobile part (Front fender) Automobile part (Side panel outer)
Relation between elongation and average plastic strain ratio(mean r-value) of cold rolled steel
Comparison of height of cups cylinder between extradeep drawing and ultra deep drawing quality
JFE Standards
Classi cation Designation
Tensile Test Mean r-value
min.BH Value
min.(N/mm 2 )
Yield Point min. (N/mm 2 )Tensile
Strengthmin.
(N/mm 2 )
Elongation min. (%)
Thickness mm Thickness mm Thickness mm
0 .4< 0 .8
0 .8< 1 .0
1.03 .2
0 .4< 0 .6
0 .6< 0 .8
0 .8< 1 .0
1.0< 1 .2
1 .2< 1.6
1 .6< 2 .0
2 .0< 2 .5
2 .53 .2
0 .51.0
1 .0
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