Cold rolled special steel strip has high requirements for production technology. In steelmaking, hot rolling, cold rolling, heat treatment and finishing of the various processes are more difficult to produce, its full process of consistent manufacturing technology, especially hot rolling control and heat treatment are the core.

Volda adopts the mode of hot-rolled blanks from large steel companies such as BaoSteel, Shougang Steel, utilizing proprietary mills to process cold rolling and annealing to meet the requirements of dimensional accuracy and excellent surface quality.

Cold Rolled Alloy Steel Strip for Machine Use


• Chemical Composition (%) - Nickel Chromium Steel

JISCSiMnPSCuNiCr
SNC631M0.27-0.350.15-0.350.35-0.650.0300.0300.302.50-3.000.60-1.00
SNC836M0.32-0.400.15-0.350.35-0.650.0300.0300.303.00-3.500.60-1.00
SNC415M0.12-0.180.15-0.350.35-0.650.0300.0300.302.00-2.500.20-0.50
SNC815M0.12-0.180.15-0.350.35-0.650.0300.0300.303.00-3.500.60-1.00

• 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 Steel Annealing HardnessDeep-Drawing Hardness
StandardSpecial
JISSNCM220M170160---
SNCM240180160---
SCr415170150---
SCr420170150---
SCM435M180160200-260
SCM440M180160200-260
SCM415M160150---
SMn443180160200-280
SAE
SAE1541170150200-280
SAE1552180160200-280
SAE4130180160---
SAE8615170150---

• Heat Treatment

Type of SteelOil Hardening
Temperature (°C)Hardness (HRC)
SNCM240820-87053
SNCM21M850-90035
SAE8615850-90035
SCr415850-90033
SCr420850-90035
SCM435M830-88048
SCM440M830-88051
SCM415M850-90035
SAE4130830-88045
SAE1541830-88054
SAE1552810-88054

• 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

• Applications

Automobile Seat Reclining Parts
Link Chain
Seat Adjuster
Shock Absorber

We have processing and forming simulation and analysis technology for cold rolled special steel strips and can carry out heat treatment, welding, stamping, roller pressure, rotary pressure, thermoforming and hydroforming and other process simulation and simulation analysis.

We also can provide users with high strength steel forming technical support and mold improvement support as well as 50kg-500kg sample testing with advanced technologies from steelmaking - hot rolling - pickling - cold rolling - annealing and other processes.

analysis for cold rolled alloy tool steel strip