Cold Rolled Carbon Steel Strip

As one of the leading suppliers in China for high precision cold rolled carbon steel strips, we focus on high dimensional accuracy and excellent surface quality. We utilize the latest automated steelmaking systems and advanced technologies to process cold rolling and annealing to meet the requirements of the refined industry quality steel products.

• Applications

Automotive Automatic Transmission Parts
Automotive Clutch Parts
Automotive Seat Belt Parts
Springs and Washers
Sprocket Gears
Saw Chains

carbon steel strip, cold rolled steel strip


high precision carbon steel strip

• Chemical Composition (%)

JISSAECSiMnPS
S15C0.13-0.180.15-0.350.30-0.600.0300.035
S15CK0.13-0.180.15-0.350.30-0.600.0250.025
S25C0.22-0.280.15-0.350.30-0.600.0300.035
S30CM0.27-0.330.15-0.350.60-0.900.0300.035
S35CM0.32-0.380.15-0.350.60-0.900.0300.035
S45CM0.42-0.480.15-0.350.60-0.900.0300.035
S48C0.45-0.510.15-0.300.60-0.900.0300.035
S50CM0.47-0.530.15-0.300.60-0.900.0300.035
SAE10500.48-0.550.15-0.350.60-0.900.0300.050
S53C0.50-0.560.15-0.350.60-0.900.0300.035
S55CM0.52-0.580.15-0.350.60-0.900.0300.035
SAE10550.50-0.600.15-0.300.60-0.900.0300.050
S58C0.55-0.610.15-0.350.60-0.900.0300.035
S60CM0.55-0.650.15-0.300.60-0.900.0300.035
SAE10600.55-0.650.15-0.300.60-0.900.0300.050
SAE10650.60-0.700.15-0.300.60-0.900.0300.050
S65CM0.60-0.700.15-0.300.60-0.900.0300.035
SAE10700.65-0.750.15-0.300.60-0.900.0300.050
S70CM0.65-0.750.15-0.300.60-0.900.0300.035
SAE10750.70-0.800.15-0.300.40-0.700.0300.050
S75CM0.70-0.800.15-0.300.60-0.900.0300.035
SAE10800.75-0.880.15-0.300.60-0.900.0300.050
SAE10850.80-0.980.15-0.300.70-1.000.0300.050
SAE10900.85-0.980.15-0.300.60-0.900.0300.050

• Thickness Tolerance (mm)

Several different grades of thickness allowance― A(standard) and S, SS, and SSS(special)― are available. The thickness is
measured arbitrarily at more than 10 mm from the edge of the steel. When the width is 20 mm or less, the steel is measured in the center portion.

GradeASSSSSS
WidthLess than 450Less than 450Less than 400Less than 200
Thickness
0.10-0.15±0.010±0.008±0.007±0.006
0.15-0.25±0.015±0.010±0.008±0.007
0.25-0.40±0.020±0.015±0.010±0.008
0.40-0.60±0.025±0.020±0.015±0.010
0.60-0.90±0.030±0.025±0.020±0.015
0.90-1.20±0.040±0.030±0.025±0.020
1.20-1.60±0.050±0.040±0.030±0.025
1.60-2.10±0.055±0.050±0.040±0.030
2.10-2.60±0.060±0.055±0.050±0.040
2.60-3.25±0.065±0.060±0.050±0.045
3.25-4.00±0.080±0.070±0.060±0.050
4.00-5.00±0.090±0.080±0.070---

• Width Tolerance (mm)

GradeAS
WidthLess than 200Less than 450Less than 200Less than 450
Thickness
<0.60±0.15±0.25±0.10±0.20
0.60-1.20±0.20±0.30±0.15±0.25
1.20-3.25±0.25±0.40±0.20±0.35
3.25-4.00±0.25±0.40±0.20±0.35
4.00-5.00±0.40±0.55±0.35±0.50

• Lateral Bending Tolearance (mm)

GradeASSS
Width
10-20201512
20-4015108
40-80864
80-45043-

cold rolled special steel strips, cold rolled alloy steel strips, cold rolled high strength steel strips

• Flatness Tolerance (mm)

ToleranceThickness
≤0.600.60-1.201.20-3.203.20-5.00
≤200AnnealedWidthwise1.01.01.52.0
Lengthwise2.03.03.05.0
Hard-drawnWidthwise1.01.51.52.5
Lengthwise3.04.04.06.0
200-450AnnealedWidthwise1.52.02.53.0
Lengthwise4.05.05.07.0
Hard-drawnWidthwise1.52.03.04.0
Lengthwise6.07.07.09.0

cold rolled special steel strips, cold rolled alloy steel strips, cold rolled high strength steel strips

• Finish and Hardness

Aside from ordinary annealing and hard-drawn finishes, Volda also implements PPC, PT, and other
finishes aimed at speeding up hardening and conserving heat.

StageSymbolCondition
AnnealingAAnnealing is implemented after cold rolling
SkinpassSAnnealing and thermal refining are implemented after cold rolling
Deep drawingCCold rolling is implemented
PatentingPTPatenting treatment and fixed cold rolling are implemented
PPCPCSpheroidal carbide is refined