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

• Chemical Composition (%)

JIS	SAE	C	Si	Mn	P	S
S15C		0.13-0.18	0.15-0.35	0.30-0.60	0.030	0.035
S15CK		0.13-0.18	0.15-0.35	0.30-0.60	0.025	0.025
S25C		0.22-0.28	0.15-0.35	0.30-0.60	0.030	0.035
S30CM		0.27-0.33	0.15-0.35	0.60-0.90	0.030	0.035
S35CM		0.32-0.38	0.15-0.35	0.60-0.90	0.030	0.035
S45CM		0.42-0.48	0.15-0.35	0.60-0.90	0.030	0.035
S48C		0.45-0.51	0.15-0.30	0.60-0.90	0.030	0.035
S50CM		0.47-0.53	0.15-0.30	0.60-0.90	0.030	0.035
	SAE1050	0.48-0.55	0.15-0.35	0.60-0.90	0.030	0.050
S53C		0.50-0.56	0.15-0.35	0.60-0.90	0.030	0.035
S55CM		0.52-0.58	0.15-0.35	0.60-0.90	0.030	0.035
	SAE1055	0.50-0.60	0.15-0.30	0.60-0.90	0.030	0.050
S58C		0.55-0.61	0.15-0.35	0.60-0.90	0.030	0.035
S60CM		0.55-0.65	0.15-0.30	0.60-0.90	0.030	0.035
	SAE1060	0.55-0.65	0.15-0.30	0.60-0.90	0.030	0.050
	SAE1065	0.60-0.70	0.15-0.30	0.60-0.90	0.030	0.050
S65CM		0.60-0.70	0.15-0.30	0.60-0.90	0.030	0.035
	SAE1070	0.65-0.75	0.15-0.30	0.60-0.90	0.030	0.050
S70CM		0.65-0.75	0.15-0.30	0.60-0.90	0.030	0.035
	SAE1075	0.70-0.80	0.15-0.30	0.40-0.70	0.030	0.050
S75CM		0.70-0.80	0.15-0.30	0.60-0.90	0.030	0.035
	SAE1080	0.75-0.88	0.15-0.30	0.60-0.90	0.030	0.050
	SAE1085	0.80-0.98	0.15-0.30	0.70-1.00	0.030	0.050
	SAE1090	0.85-0.98	0.15-0.30	0.60-0.90	0.030	0.050

• 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.

Grade	A	S	SS	SSS
Width	Less than 450	Less than 450	Less than 400	Less than 200
Thickness	Less than 450	Less than 450	Less than 400	Less than 200
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)

Grade	A		S
Width	Less than 200	Less than 450	Less than 200	Less than 450
Thickness	Less than 200	Less than 450	Less than 200	Less than 450
<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)

Grade	A	S	SS
Width	A	S	SS
10-20	20	15	12
20-40	15	10	8
40-80	8	6	4
80-450	4	3	-

• Flatness Tolerance (mm)

Tolerance			Thickness
Tolerance			≤0.60	0.60-1.20	1.20-3.20	3.20-5.00
≤200	Annealed	Widthwise	1.0	1.0	1.5	2.0
	Annealed	Lengthwise	2.0	3.0	3.0	5.0
	Hard-drawn	Widthwise	1.0	1.5	1.5	2.5
	Hard-drawn	Lengthwise	3.0	4.0	4.0	6.0
200-450	Annealed	Widthwise	1.5	2.0	2.5	3.0
	Annealed	Lengthwise	4.0	5.0	5.0	7.0
	Hard-drawn	Widthwise	1.5	2.0	3.0	4.0
	Hard-drawn	Lengthwise	6.0	7.0	7.0	9.0

• 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.

Stage	Symbol	Condition
Annealing	A	Annealing is implemented after cold rolling
Skinpass	S	Annealing and thermal refining are implemented after cold rolling
Deep drawing	C	Cold rolling is implemented
Patenting	PT	Patenting treatment and fixed cold rolling are implemented
PPC	PC	Spheroidal carbide is refined

Cold Rolled Carbon Steel Strip

Cold Rolled Carbon Steel Strip

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