Cold Rolled Carbon Tool Steel Strip

As one of the few suppliers in China for cold rolled special 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

Razor Blades
Saw Blades
Cutters
Needles
Springs
Measures
Bearing Parts
Agricultural Machinery Parts

• Chemical Composition (%)

JISSAECSiMnPS
SK2M1.10-1.300.350.500.0300.030
SK3M1.00-1.100.350.500.0300.030
SAE10950.90-1.030.15-0.300.30-0.500.0300.050
SK4M0.90-1.000.350.500.0300.030
SAE10860.80-0.930.15-0.300.30-0.500.0300.030
SK5M0.80-0.900.350.500.0300.030
SK6M0.70-0.800.350.500.0300.030
SK7M0.60-0.700.350.500.0300.030

• 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

• Hardness (HV)

StandardType of SteelAnnealing HardnessDeep-Drawing Hardness
StandardSpecial
JISSK2M220200---
SK3M210190210-300
SK4M200180200-280
SK5M180170200-280
SK6M180170180-260
SK7M180160180-260
SAESAE1078180170200-280
SAE1086180170200-280
SAE1095220190220-280

• Heat Treatment

Type of SteelWater HardeningOil Hardening
Temperature (°C)Hardness (HRC)Temperature (°C)Hardness (HRC)
SK2M760-82062790-85060
SK3M760-82062790-85060
SK4M760-82062790-85060
SK5M760-82062790-85060
SK6M760-82062790-85060
SK7M760-82059790-85057

• Finish

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

Cold-rolled special steel strip is available in the following finishes.

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