Cold Rolled Carbon Tool Steel Strip

Cold Rolled Carbon Tool Steel Strip

Aplicaciones

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

Chemical Composition (%)

JIS	SAE	C	Si	Mn	P	S
SK2M		1.10-1.30	0.35	0.50	0.030	0.030
SK3M		1.00-1.10	0.35	0.50	0.030	0.030
	SAE1095	0.90-1.03	0.15-0.30	0.30-0.50	0.030	0.050
SK4M		0.90-1.00	0.35	0.50	0.030	0.030
	SAE1086	0.80-0.93	0.15-0.30	0.30-0.50	0.030	0.030
SK5M		0.80-0.90	0.35	0.50	0.030	0.030
SK6M		0.70-0.80	0.35	0.50	0.030	0.030
SK7M		0.60-0.70	0.35	0.50	0.030	0.030

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.

Grade	A	S	SS	SSS
Anchura	Less than 450	Less than 450	Less than 400	Less than 200
Grosor
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
Anchura	Less than 200	Less than 450	Less than 200	Less than 450
Grosor
<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
Anchura
10-20	20	15	12
20-40	15	10	8
40-80	8	6	4
80-450	4	3	-

Flatness Tolerance (mm)

Tolerance			Grosor
			≤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
		Lengthwise	2.0	3.0	3.0	5.0
	Hard-drawn	Widthwise	1.0	1.5	1.5	2.5
		Lengthwise	3.0	4.0	4.0	6.0
200-450	Annealed	Widthwise	1.5	2.0	2.5	3.0
		Lengthwise	4.0	5.0	5.0	7.0
	Hard-drawn	Widthwise	1.5	2.0	3.0	4.0
		Lengthwise	6.0	7.0	7.0	9.0

Hardness (HV)

Standard	Type of Steel	Annealing Hardness		Deep-Drawing Hardness
		Standard	Special
JIS	SK2M	220	200	---
	SK3M	210	190	210-300
	SK4M	200	180	200-280
	SK5M	180	170	200-280
	SK6M	180	170	180-260
	SK7M	180	160	180-260
SAE	SAE1078	180	170	200-280
	SAE1086	180	170	200-280
	SAE1095	220	190	220-280

Heat Treatment

Type of Steel	Water Hardening		Oil Hardening
	Temperature (°C)	Hardness (HRC)	Temperature (°C)	Hardness (HRC)
SK2M	760-820	62	790-850	60
SK3M	760-820	62	790-850	60
SK4M	760-820	62	790-850	60
SK5M	760-820	62	790-850	60
SK6M	760-820	62	790-850	60
SK7M	760-820	59	790-850	57

Terminar

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 steel strips are available in the following finishes.

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