Slitting

Cold Rolled Steel (CR)

CR steel rolling is done at or near room temperature. Tempering and approriated chemical composition provide strength to the material and achieve the require mechanical properties.The surface is either dull finish which is matt or bright finish which is smooth. It widely used in many application. To meet the multiple application, the specification of cold rolled steel coil became more and more diversified. For example, some specifications provide excellent drawability, formability for deep forming requirement, some improved high tensile strength, paintability. Below is application, characteristic, mechanical properties of common cold rolled steel to meet your requirement . For more specialised CR steel, please contact our sales

Characteristics

Cold Rolled Steel (CR) is easily formable for moderate draw applications. CR features a fine surface and excellent workability is ideal for end product where high yield, ductility, shape accuracy is requires.

Application

Cold Rolled Steel is a common material ideal use for variety of products ranging in many home appliances such as refrigerators and washing machines to industrial machinery, architectural components and automobiles. 

Symbol of quality

Symbol of quality Remarks
SPCC Commercial quality
SPCD Drawing quality
SPCE Deep Drawing quality

Temper grade

Temper grade Symbol of temper grade
As-annealed A
Standard temper grade S
1/8 hard 8
1/4 hard 4
1/2 hard 2
Full hard  1

Surface finish

Surface finish Symbol of surface finish Remarks
Dull finish D A matt finish produced with a roll roughened its surface mechanically or chemically .This surfice finish allows lubricant to adhere on to the surface more evenly, thus reducing friction and better adhere of paint.
Bright finish B A smooth finish produced with a roll finished its surface smoothly

Chemical Compositions 

Standard JIS G3141
Symbol of Class SPCC SPCCT SPCD SPCE SPCF d SSPCG
Chemical Composition C max. 0.15 0.15 0.10 0.08 0.06 0.02
Si max - - - - - -
Mn max. 0.60 0.60 0.50 0.45 0.45 0.25
P max. 0.10 0.10 0.040 0.030 0.030 0.020
S max. 0.035 0.035 0.035 0.030 0.030 0.020

Mechanical Properties

Symbol of Class SPCC SPCCT SPCD SPCE SPCF d SSPCG
Tensile Test / Thickness(t)mm r
Tensile Strength eN/mm2 (min) 0.30 ≦t - 270 270 270 270 270
Yield PointN/mm2(max) 0.30≦t - - ( 240) ( 240) ( 210) ( 190)
Elongation% (min) 0.30≦t<0.40 - 31 33 35 - -
0.40≦t<0.60 - 34 36 38 40 42
0.60≦t<1.00 - 36 38 40 42 44
1.00≦t<1.60 - 37 39 41 43 45
1.60≦t<2.50 - 38 40 42 44 46
The average ratio of plastic strain r 0.50 ≦t≦ 1.00 - - - - - 1.5 min
1.00<t≦1.60 - - - - - 1.4 min
Bend Test f Bend Test 180 degree
Radius of Inside Surface Flat on Itself

Hardness

Temper Grade Specifications HRB HV
Full hardness SPCC-1 (85 min.) (170 min)
1/2 hardness SPCC-2 74~89 135~185
1/4 hardness SPCC-3 65~80 115~150
1/8 hardness SPCC-4 50~71 95~130

Thickness Tolerances ( JIS G3141 Thickness Tolerances)

Thickeness (mm) Width(mm)
w<1000 1000≦ w<1250 1250≦ w<1630 w≧ 1630
t < 0.40 ±0.04 ±0.04 - -
0.4 ≦ t < 0.60 ±0.05 ±0.05 ±0.06 -
0.60 ≦ t < 0.80 ±0.06 ±0.06 ±0.06 ±0.07
0.80 ≦ t < 1.00 ±0.06 ±0.07 ±0.08 ±0.09
1.00 ≦ t < 1.25 ±0.07 ±0.08 ±0.09 ±0.11
1.25 ≦ t < 1.60 ±0.09 ±0.10 ±0.11 ±0.13
1.60 ≦ t < 2.00 ±0.11 ±0.12 ±0.13 ±0.15
2.00 ≦ t ±0.13 ±0.14 ±0.15 ±0.17