Rakelstahl Anwendung
Rakelstahl

Benefits at a glance:

  • maximum straightness deviation of 0.6 mm/3 m
  • outstanding purity grade
  • consistent, specially adapted microstructure
  • exact edge geometry
  • also small quantities can be supplied fast

Doctor Blade Steel

Our strip steel for doctor blades uses high grade steel and is manufactured with precision, making it a key component for ensuring reliable processes in the printing industry. Manufacturers of doctor blades used in gravure or flexographic printing for example, appreciate the consistent quality of our strip steel for doctor blades. It can be reliably processed and its precision guarantees that the products made from it are of excellent quality. To find out more please call us – we will be very happy to take your call!

Parameters Recommendation
Thickness tolerance T2
Tensile strength range M
Flatness class 3
Surface white polished
Edges rounded
Grade HiQ 50ER, HiQ 30ER, HiQ 18ER
Straightness HiQ 50ER, HiQ 30ER, HiQ 18ER class 5
Print 18S class 4
Print 18 class 3

 

Thickness t (in) Tolerances ± in
T1 T2 T3 T4 T5
.0008 ≤ t < .0016 .00016 .00012 .00008 .00006 –
.0016 ≤ t < .0025 .00020 .00016 .00012 .00008 –
.0025 ≤ t < .0039 .00024 .00020 .00016 .00012 .00008
.0039 ≤ t < .0049 .00028 .00020 .00016 .00012 .00008
.0049 ≤ t < .0063 .00035 .00024 .00020 .00016 .00012
.0063 ≤ t < .0079 .00039 .00028 .00020 .00016 .00012
.0079 ≤ t < .0098 .00043 .00031 .00024 .00016 .00012
.0098 ≤ t < .0124 .00051 .00035 .00028 .00020 .00016
.0124 ≤ t < .0157 .00059 .00043 .00031 .00024 .00016
.0157 ≤ t < .0197 .00067 .00047 .00035 .00024 .00016
.0197 ≤ t < .0248 .00079 .00055 .00039 .00028 .00020
.0248 ≤ t < .0315 .00091 .00067 .00047 .00031 .00024
.0315 ≤ t < .0394 .00106 .00075 .00051 .00035 .00028
.0394 ≤ t < .0492 .00134 .00094 .00067 .00047 .00031
.0492 ≤ t < .0630 .00154 .00110 .00079 – –
.0630 ≤ t < .0689 .00181 .00130 .00091 – –

 

Thickness t (mm) Tolerances ± mm
T1 T2 T3 T4 T5
0,020 ≦ t < 0,040 0,004 0,003 0,002 0,002 –
0,040 ≦ t < 0,063 0,005 0,004 0,003 0,002 –
0,063 ≦ t < 0,100 0,006 0,005 0,004 0,003 0,002
0,100 ≦ t < 0,125 0,007 0,005 0,004 0,003 0,002
0,125 ≦ t < 0,160 0,009 0,006 0,005 0,004 0,003
0,160 ≦ t < 0,200 0,010 0,007 0,005 0,004 0,003
0,200 ≦ t < 0,250 0,011 0,008 0,006 0,004 0,003
0,250 ≦ t < 0,315 0,013 0,009 0,007 0,005 0,004
0,315 ≦ t < 0,400 0,015 0,011 0,008 0,006 0,004
0,400 ≦ t < 0,500 0,017 0,012 0,009 0,006 0,004
0,500 ≦ t < 0,630 0,020 0,014 0,010 0,007 0,005
0,630 ≦ t < 0,800 0,023 0,017 0,012 0,008 0,006
0,800 ≦ t < 1,000 0,027 0,019 0,013 0,009 0,007
1,000 ≦ t < 1,250 0,034 0,024 0,017 0,012 0,008
1,250 ≦ t < 1,600 0,039 0,028 0,020 – –
1,600 ≦ t ≦ 1,750 0,046 0,033 0,023 – –

Thickness t (in) Width w (in) Tolerances ± in
B1 B2 B3
t < .0098 w < .79 .003 .002 .001
.79 ≤ w < 1.97 .004 .003 .002
1.97 ≤ w < 4.92 .006 .004 .003
w ≥ 4.92 .008 .006 .004
.0098 ≤ t < .0197 w < .79 .004 .003 .002
.79 ≤ w < 1.97 .006 .004 .003
1.97 ≤ w < 4.92 .008 .006 .004
w ≥ 4.92 .010 .008 .006
.0197 ≤ t < .0394 w < .79 .006 .004 .003
.79 ≤ w < 1.97 .008 .006 .004
1.97 ≤ w < 4.92 .010 .008 .006
w ≥ 4.92 .012 .010 .006
.0394 ≤ t < .0630 w < .79 .008 .006 .004
.79 ≤ w < 1.97 .010 .008 .006
1.97 ≤ w < 4.92 .012 .010 .006
w ≥ 4.92 .014 .010 .008
.0630 ≤ t ≦ .0689 w < .79 .010 .008 .006
.79 ≤ w < 1.97 .012 .008 .006
1.97 ≤ w < 4.92 .014 .012 .008
w ≥ 4.92 .016 .012 .008

 

 

Thickness t mm Width w mm Tolerances ± mm
B1 B2 B3
t < 0,25 w < 20,00 0,07 0,05 0,03
20,00 ≦ w < 50,00 0,10 0,07 0,05
50,00 ≦ w < 125,00 0,15 0,11 0,07
w ≧ 125,00 0,20 0,15 0,10
0,25 ≦ t < 0,5 w < 20,00 0,10 0,07 0,05
20,00 ≦ w < 50,00 0,15 0,11 0,07
50,00 ≦ w < 125,00 0,20 0,15 0,10
w ≧ 125,00 0,25 0,20 0,15
0,5 ≦ t < 1,0 w < 20,00 0,15 0,11 0,07
20,00 ≦ w < 50,00 0,20 0,15 0,10
50,00 ≦ w < 125,00 0,25 0,20 0,15
w ≧ 125,00 0,30 0,25 0,15
1,0 ≦ t < 1,6 w < 20,00 0,20 0,15 0,10
20,00 ≦ w < 50,00 0,25 0,20 0,15
50,00 ≦ w < 125,00 0,30 0,25 0,15
w ≧ 125,00 0,35 0,25 0,20
1,6 ≦ t ≦ 1,75 w < 20,00 0,25 0,20 0,15
20,00 ≦ w < 50,00 0,30 0,20 0,15
50,00 ≦ w < 125,00 0,35 0,30 0,20
w ≧ 125,00 0,40 0,30 0,20

Available in white, blue and yellow

Surface Roughness

Thickness t (in) Roughness (nach DIN EN ISO 4287 : 1998)
Class 1 Class 2 Class 3
t ≤ .0197 Ra ≦ 11.8 µin
Rt ≦ 118 µin		 Ra ≦ 9.8 µin
Rt ≦ 98 µin		 Ra ≦ 5.1 µin
Rt ≦ 59 µin
.0197 < t ≤ .0276 Ra ≦ 7.9 µin
Rt ≦ 79 µin
.0276 < t ≤ .0394 Ra ≦ 13.8 µin
Rt ≦ 138 µin
.0394 < t ≤ .0689 Ra ≦ 15.7 µin
Rt ≦ 157 µin		 Ra ≦ 13.8 µin
Rt ≦ 138 µin		 Ra ≦ 11.8 µin
Rt ≦ 118 µin

 

Available in white, blue and yellow

Surface Roughness

Thickness t mm Roughness (nach DIN EN ISO 4287 : 1998)
Class 1 Class 2 Class 3
t ≦ 0,500 Ra ≦ 0,30 µm
Rt ≦ 3,00 µm		 Ra ≦ 0,25 µm
Rt ≦ 2,50 µm		 Ra ≦ 0,13 µm
Rt ≦ 1,50 µm
0,500 < t ≦ 0,700 Ra ≦ 0,20 µm
Rt ≦ 2,00 µm
0,700 < t ≦ 1,000 Ra ≦ 0,35 µm
Rt ≦ 3,50 µm
1,000 < t ≦ 1,750 Ra ≦ 0,40 µm
Rt ≦ 4,00 µm		 Ra ≦ 0,30 µm
Rt ≦ 3,00 µm		 Ra ≦ 0,30 µm
Rt ≦ 3,00 µm

Thickness t (in) Tensile Strength MPa Eberle Tolerance +/-
Range L Range M Range H
.0008 ≤ t < .0039 – HV630 – HV25
.0039 ≤ t < .0049 1800 2100 2300 50
.0049 ≤ t < .0069 1800 2050 2250 50
.0069 ≤ t < .0089 1750 2000 2200 50
.0089 ≤ t < .0108 1750 1950 2200 50
.0108 ≤ t < .0148 1700 1900 2150 50
.0148 ≤ t < .0167 1650 1850 2100 50
.0167 ≤ t < .0187 1600 1800 2050 50
.0187 ≤ t < .0207 1550 1750 2000 50
.0207 ≤ t < .0246 1550 1750 2000 50
.0246 ≤ t < .0285 1500 1700 1950 50
.0285 ≤ t < .0325 1500 1700 1950 50
.0325 ≤ t < .0364 1450 1650 1900 50
.0364 ≤ t < .0404 1450 1650 1900 50
.0404 ≤ t < .0453 1450 1650 1900 50
.0453 ≤ t < .0492 1400 1600 1850 50
.0492 ≤ t < .0531 1400 1600 1850 50
.0531 ≤ t < .0620 1400 1600 1850 50
.0620 ≤ t ≤ .0689 1350 1550 1800 50

 

Thickness t (mm) Tensile Strenght MPa Eberle Tolerance +/-
Range L Range M Range H
0,020 ≤ t < 0,100 – HV630 – HV25
0,100 ≤ t < 0,125 1800 2100 2300 50
0,125 ≤ t < 0,175 1800 2050 2250 50
0,175 ≤ t < 0,225 1750 2000 2200 50
0,225 ≤ t < 0,275 1750 1950 2200 50
0,275 ≤ t < 0,375 1700 1900 2150 50
0,375 ≤ t < 0,425 1650 1850 2100 50
0,425 ≤ t < 0,475 1600 1800 2050 50
0,475 ≤ t < 0,525 1550 1750 2000 50
0,525 ≤ t < 0,625 1550 1750 2000 50
0,625 ≤ t < 0,725 1500 1700 1950 50
0,725 ≤ t < 0,825 1500 1700 1950 50
0,825 ≤ t < 0,925 1450 1650 1900 50
0,925 ≤ t < 1,025 1450 1650 1900 50
1,025 ≤ t < 1,150 1450 1650 1900 50
1,150 ≤ t < 1,250 1400 1600 1850 50
1,250 ≤ t < 1,350 1400 1600 1850 50
1,350 ≤ t < 1,575 1400 1600 1850 50
1,575 ≤ t ≤ 1,750 1350 1550 1800 50

Thickness t in Flatness deviation P
Class 1 Class 2 Class 3 Class 4
.0008 ≦ t < .0039 P60 P50 P40 P30
.0039 ≦ t < .0079 P50 P40 P30 P20
.0079 ≦ t < .0138 P45 P35 P25 P15
.0138 ≦ t < .0197 P40 P30 P20 P10
.0197 ≦ t ≦ .0689 P35 P25 P15 P10

P15 means maximum flatness deviation of .0015 in per 1 in strip width.

Thickness t mm Flatness Deviation P
Class 1 Class 2 Class 3 Class 4
0,020 ≦ t < 0,100 P60 P50 P40 P30
0,100 ≦ t < 0,200 P50 P40 P30 P20
0,200 ≦ t < 0,350 P45 P35 P25 P15
0,350 ≦ t < 0,500 P40 P30 P20 P10
0,500 ≦ t ≦1,750 P35 P25 P15 P10

P15 means maximum flatness deviation of 1,5 µm per 1 mm strip width.

Strip width w (in) Measured lenght (ft) Class 3 (in) Class 4 (in) Class 5 (in)
w < .591 1.6 .063 .031 .024
.591 ≤ w < 1.378 3.3 .071 .035 .024
10 .142 .071 .047
1.378 ≤  w < 4.921 3.3 .047 .024 .012
10 .094 .047 .024
4.921  ≤ w ≤  9.843 3.3 .047 – –

G0,6/3 means maximum straightness deviation of .024 in over a measuring length of 10 ft.

 

Strip width w (mm) Measured lenght (m) Class 3 (mm) Class 4 (mm) Class 5 (mm)
w < 15,00 0,5 1,6 0,8 0,6
15,00 ≤ w < 35,00 1 1,8 0,9 0,6
3 3,6 1,8 1,2
35,00 ≤ w < 125,00 1 1,2 0,6 0,3
3 2,4 1,2 0,6
125,00 ≤ w ≤ 250,00 1 1,2 – –

G0,6/3 means maximum straightness deviation of 0,6 mm over a measuring length of 3 m.

Grade Chemical Composition (percent nominal) Comparison of Norms
C Si Mn Cr DIN Material-No. US-Norm
HiQ 50ER on request on request on request on request on request on request on request
HiQ 30ER 1,05 0,25 0,30 1,50 102Cr6 1.2067 –
HiQ 18ER
Print 18S
Print 18		 1,00 0,25 0,40 – C100S 1.1274 AISI 1095

KG, KE Slit
.079 ≤ w ≤ 9.843 in
2,00 ≤ w ≤ 250,00 mm
Deburred
t < .026 in: .157 ≤ w ≤ 9.843 in
t ≥ .026 in: .157 ≤ w ≤ 5.906 in0,65 mm: 4,00 ≤ w ≤ 250,00 mm
t ≥ 0,65 mm: 4,00 ≤ w ≤ 150,00 mm
K2 Bevelled
t ≥ .012 in
.394 ≤ w ≤ 5.906 int ≥ 0,30 mm
10,00 ≤ w ≤ 150,00 mm
Tip: s
Bevel angle: x
K3 Rectangular rounded
t ≥ .006 in
.236 ≤ w ≤ 5.906 int ≥ 0,15 mm
6,00 ≤ w ≤ 150,00 mm
Standard radiuses r
.006 ≤ t < .010 in : .0016 in
.010≤ t < .031 in : .0031 in
.031 ≤ t < .050 in : .0059 in
.050 ≤ t ≤ .069 in : .0078 in

0,15 ≤ t < 0,25 mm : 0,04 mm
0,25 ≤ t < 0,80 mm : 0,08 mm
0,80 ≤ t < 1,27 mm : 0,15 mm
1,27 ≤ t ≤ 1,75 mm : 0,20 mm
K4 Rounded
t ≥ .0024 in
.157 ≤ w ≤ 5.906 int ≥ 0,06 mm
4,00 ≤ w ≤ 150,00 mm

We supply the appropriate steel grades and processing for each type of doctor blade that you manufacture.

The special characteristics of our High Quality grades are determined by:

  • max. straightness deviation of .024 in/10 ft
  • superior purity grade
  • constant and specially adapted microstructure
  • best flatness metrics
  • exact edge geometries

Our Print grades feature the following winning criteria:

  • defined straightness
  • constant microstructure
  • best flatness
  • exact edge geometries