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Cold Rolled Steel Sheet Standard

JIS Specifications

JIS G 3141(1990) Cold Rolled Carbon Steel Sheets and Strip
Symbol of Classification
Symbol of Class
Remarks
SPCC
  For general use
SPCD
  For deep drawing use
SPCE
  For extra deep drawing use
Remarks







 1. In respect to SPCC sheet or strip of
standard grade or of as annealed,
where the value obtained by tensile
test and/or Erichsen test are guaran
teed by the order of purchaser,its
symbol for classification shall be
SPCCT with a T suffixed to its origi-
nal symbol.
   2.In respect to SPCE sheet or strip of
standard grade, where the non-aging
is guaranteed by the order of purchaser,
its symbol for classification shall be
SPCEN with an N suffixed to its origi-
nal symbol.
Distinction Surface Finish
Distinction of
surface finish
Symbol of
surface finish
Remarks
Dull finish
D
 Dull or matte in appearance;
a finish by rolling on rolls
roughenedby mechanical
or chemical means.
Bright finish
B
 Luster in apperance; a finish
by rolling on rolls polished
sufficiently smoothly

Distinction of Temper Grade
Distinction of temper grade
Symbol of temper grade
As annealed
Standard grade
1/8 hard
A
S
8
1/4 hard
Full hard
4
1


Mechanical Properties
Tensile Strength. Elongation, Non-aging and Erichsen Value
Tensile
test
Tensile
strength
N/mm2
Elongation min.%
Tensile
test
piece
Erichsen value min, mm.
Division
by
nominal
thicness
mm.
0.25
or
over
0.25 or over to and
excl.
0.40
0.40 or
over to
and
excl.
0.60

0.60 or
over to
and
excl.
1.0

1.0 or
over to
and
excl.
1.6
1.6 or
over to
and
excl.
2.5
2.5
or
over
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.2
1.4
1.6
Symbol
of class
SPCC
270min.
[32]
[34]
[36]
[37]
[38]
[39]
No.5
in the
derection
of
rolling
7.2
7.8
8.4
8.8
9.1
9.4
9.6
10.0
10.3
10.5
SPCD
270min.
34
36
38
39
40
41
7.6
8.2
8.8
9.2
9.5
9.8
10.0
10.4
10.7
10.9
SPCE
270min.
36
38
40
41
42
43
8.0
8.6
9.2
9.6
9.9
10.2
10.4
10.8
11.1
11.3

Remarks

 1. The tensile test value does not usually apply to SPCC. When required by the purchaser, however, the values in
    parentheses shall be adopted.
  2. For those less than 0.60 mm. in thickness, the tensile test shall generally be omitted.
  3.This Table applies to those of 30 mm. or more in width.
  4. When the non-aging is specified for the standard grade steel sheet and strip of SPCE, it shall be guaranteed for 6
   monthes after the shipment of the manufacturing factory. The term non-aging means the property not to produce
   stretcher strain on the sheet being worked.
  5. For intermediate thicknesses in the range from 0.4 mm. to 1.6 mm. of nominal thickness, which are not listed in this
   The Erichsen value shall be determined by means of interpolation to a tenth's place obtained by rounding of.
  6. The above Erichsen values apply to the average of the test values of 3 pieces.


Hardness Bendability
Distinction of
temper grade
Symbol of
temper grade
Hardness
HRB
HV
1/8 hard
8
50 to 71
95 to 130
1/4 hard
4
65 to 80
115 to 150
Full hard
1
85 min.
170 min.
Remark: Either Rockwell of Vicker hardness scale may be
              applies
 
Distinction of
temper grade
Symbol
of temper
grade
Bend test
Bend angle
Inside radius
Test piece
As annealed
A
180°
Close contact
no.3,in the
direction of
rolling
Standard grade
S
180°
Close contact
1/8 hard
8
180°
Close contact
1/4 hard
4
180°
0.5xthickness
Full hard
1
-
-
Remark: The test may be omitted for the steel sheets and strip of
               as annealed and of standard grade.

Dimensional Tolerances
Division by
nominal width
Under
630
630 or
over to
and excl.
1000
1000 or
over to
and excl.
1250
1250 or
over
Division by
nominal thickness
Under 0.25
+-0.03
+-0.03
+-0.03
-
0.25 or over to and excl.0.40
+-0.04
+-0.04
+-0.04
-
0.40 or over to and excl.0.60
+-0.05
+-0.05
+-0.05
+-0.06
0.60 or over to and excl.0.80
+-0.06
+-0.06
+-0.06
+-0.06
0.80 or over to and excl.1.00
+-0.06
+-0.06
+-0.06
+-0.08
1.00 or over to and excl.1.25
+-0.07
+-0.07
+-0.08
+-0.09
1.25 or over to and excl.1.60
+-0.08
+-0.09
+-0.10
+-0.11
1.60 or over to and excl.2.00
+-0.10
+-0.11
+-0.12
+-0.13
2.00 or over to and excl.2.50
+-0.12
+-0.13
+-0.14
+-0.15
2.50 or over
+-0.14
+-0.15
+-0.16
+-0.17
Width Tolerances A
Division nominal width
Under 1250
1250 or over
+7
+10
0
0
Remark: For the stretcher-lever finished steel
             sheet, the plus side tolerances do
             not apply.

Width Tolerances B
Division by nominal width
Under 1250
1250 or over
+3
+4
0
0

Flatness
Classification of
shape-irregularity
Tolerances A
Tolerances B
Division by
nominal width
Bow,wave
Edge wave
Center buckle
Bow,wave
Edge wave
Center buckle
 Under 1000
12
8
6
2
2
2
 1000 or over to and excl. 1250
15
9
8
3
2
2
 1250 or over
15
11
8
4
3
2

Camber
Classification of
steel sheet and strip
Steel sheet
Steel strip
Division by
nominal width
Under 2000
in length
2000 or over
in length
30 or over to and excl. 60
8
8 in any 2000 length
60 or over to and excl. 630
4
in any 2000 length
630 or over
2
in any 2000 length
   Remark: The table does not apply to the
                   irregular portion steel strip.




JIS G.3135(1986)
Cold Rolled High Strength Steel Sheet with Improved
Formability for Automobile Structural Uses

Symbols of Classes
Symbols of class
Applied thickness mm
Remarks
SPFC 340
0.6 and over to 2.3 incl.
Drawing use
SPFC 370
SPFC 390
0.6 and over to 2.3 incl.
Forming use
SPFC 440

 

Chemical Composition  The chemical composition shall be agreed upon between the parties concerned as requied

 

Mechanical Propertie

Symbol of
class
Tensile
strength
N/mm2
Yield point
or proof
stress N/mm2
Elongation %
Test
piece
Bendability
Thickness mm.
Bending
angle
Radius of
inside
surface
Test
piece
0.06 and over
to under 1.0
1.0 and over
to 2.3 incl.
SPFC 340
340 min.
175 min.
34 min.
35 min.
*1
180°
Tightlock
*2
SPFC 370
370 min.
205 min.
32 min.
33 min.
Tightlock
SPFC 390
390 min.
235 min
30 min.
31 min.
Tightlock
SPFC 440
440 min.
265 min.
26 min.
27 min.
Tightlock

*1 JIS No.5 test piece taken perpendicular to rolling direction
*2 JIS No.3 test piece taken perpendicular to rolling direction



Dimensional Tolerances
Tolerances on Thickness

Applicable division
according to tensile
strength
Width
Under 630
630 and over
to under 1000
1000 and over
to under 1250
1250 and over
Thickness
Steel sheets of under 780
N/mm2 in specification
lower limit of tensile
strength
0.60 and over to under 0.80
+-0.06
+-0.06
+-0.06
+-0.07
0.80 and over to under 1.00
+-0.07
+-0.07
+-0.08
+-0.09
1.00 and over to under 1.25
+-0.08
+-0.08
+-0.09
+-0.10
1.25 and over to under 1.60
+-0.09
+-0.10
+-0.11
+-0.12
1.60 and over to under 2.00
+-0.10
+-0.11
+-0.12
+-0.14
2.00 and over to under 2.30
+-0.12
+-0.13
+-0.14
+-0.16
Remarks 1.The measuring position of thickness shall be an arbirtary point 25 mm.min.inside from the edge for a mill edge and an
                   arbilitrary point 15 mm.min.inside from the edge for a cut edge.
                2.This table shall not be applied to the abnormal parts at both ends steel strip in coil.

Tolerances on Width
Width
Tolerances
Under 1250
+7
0
1250 and over
+10
0

Maximum Value of Flatness of Steel Sheets
Classification of
Strains
Warpage and waviness
Ear waviness
Middle waviness
width\Grade
1
2
3
1
2
3
1
2
3
 Under 1000
12
16
18
8
11
12
6
8
9
 1000 and over to under 1250
15
19
21
10
12
13
8
10
11
 1250 and over
15
19
21
12
14
15
9
11
12
Remarks:
1.Grade1, Grade2 and Grade3 shall be respectively applied to steel sheets of under 780 N/mm2, 780N/mm2 and 980N/mm2
2.The value of flatness shall, as a rule, be measured by placing the steel shet on a surface plate. It shall be obtained by sub-
   tracting nominal thickness of steel sheet from the maximum value of strain and be applied to theupperside surface of steel
   sheet.


Maximum Value of Lateral Bending
Applicable division according to
tensile strength
Classification of steel sheet
and steel strip in coil
Steel sheets
Steel strip
in Coil
Width
Length of under 2000
Length of 2000 and over
Steel Sheets of under 780N/mm2
in specification lower limit of tensile
strength
Under 630
4
4 per and arbitrary length of 2000
630 and over
2
2 per and arbitrary length of 2000



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Thai Cold Rolled Steel Sheet เหล็กแผ่นรีดเย็นไทย