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High-carbon steel:

Martensitic hardened (+QT)

Classification of symbols  Numerical
 classification
European Standard (EN) Chemical Composition
C Si Mn Max. P Max. S Cr V Ni
C60S 1.1211 EN 10132-4 0.57 - 0.65 0.15 - 0.35 0.60 - 0.90 0.025 0.025 max. 0.40 - max. 0.40
C67S 1.1231 EN 10132-4 0.65-0.73 0.15 - 0.35 0.60 - 0.90 0.025 0.025 max. 0.40 - max. 0.40
C75S 1.1248 EN 10132-4 0.70-0.80 0.15 - 0.35 0.60 - 0.90 0.025 0.025 max. 0.40 - max. 0.40
51CrV4 1.8159 EN 10132-4 0.47 - 0.55 max. 0.40 0.70 - 1.10 0.025 0.025 0.90 - 1.20 0.10 - 0.25 max. 0.40
Classification of symbols  Numerical
 classification
European Standard (EN) Approximate international equivalents
US (AISI) Japan (JIS) China (GB)
                 
C60S 1.1211 EN 10132-4:2000            
C67S 1.1231 EN 10132-4:2000 1065 A682/684 S65C-CSP G4802 70 GB/T 1222
C75S 1.1248 EN 10132-4:2000 1074 A682/684 - - - -
51CrV4 1.8159 EN 10132-4:2000 6150 A505/506 SUP 10 G4802 50CrVA GB/T 1222
Classification of symbols  Numerical
 classification
European Standard (EN) Mechanical properties and hardness requirements Rockwell hardness values of steel for springs
Tempered and quenched (+QT) d Tempered and quenched (+QT)
Rm N/mm² HV HRC
C60S 1.1211 EN 10132:2021 1150 - 1750 345 - 530 35 - 51.5
C67S 1.1231 EN 10132:2021 1200 - 1900 370 - 580 38.5 - 54
C75S 1.1248 EN 10132:2021 1200 - 1900 370 - 580 38.5 - 54
51CrV4 1.8159 EN 10132:2021 1200 - 1800 370 - 550 38.5 - 52.5

Note: it is possible to specify the hardness values or the tensile strength values, but not both. If neither of the two values is specified, the tensile strength value is calculated.
The specification for tensile strength/hardness must fall within a range of 150 N/mm² or 50 HV, unless expressly stated otherwise in the commercial agreement.

EN 10132-4:2000

Finish Description
Rust grey/blue Unpolished
Bright tempered Unpolished
Polished Obtained through fine grinding, abrasive brushing or other procedures.
Polished and coloured Blue or yellow in colour due to oxidation caused by heat treatment.

 

THICKNESS TOLERANCES

A) Specified thickness tolerances for cold rolled strip and strip obtained strapping wide precision rolling w.
According to the EN 10140:2006 Standard.
Nominal Thickness t Thickness tolerances according to EN 10140 for nominal widths w of
<125 ≥ 125 and <600
> A
normal
B
fine
C
precision
A
normal
B
fine
C
precision
- 0.10 ± 0.008 ± 0.006 ± 0.004 ± 0.010 ± 0.008 ± 0.005
0.10 0.15 ±0.010 ± 0.008 ± 0.005 ± 0.015 ± 0.012 ± 0.010
0.15 0.25 ±0.015 ± 0.012 ± 0.008 ± 0.020 ± 0.015 ± 0.010
0.25 0.40 ± 0.020 ± 0.015 ± 0.010 ± 0.025 ± 0.020 ± 0.012
0.40 0.60 ± 0.025 ± 0.020 ± 0.012 ± 0.030 ± 0.025 ± 0.015
0.60 1.00 ± 0.030 ± 0.025 ± 0.015 ± 0.035 ± 0.030 ± 0.020
1.00 1.50 ± 0.035 ± 0.030 ± 0.020 ± 0.040 ± 0.035 ± 0.025
1.50 2.50 ± 0.045 ± 0.035 ± 0.025 ± 0.050 ± 0.040 ± 0.030
2.50 4.00 ± 0.050 ± 0.040 ± 0.030 ± 0.060 ± 0.050 ± 0.035
4.00 6.00 ± 0.060 ± 0.050 ± 0.035 ± 0.070 ± 0.055 ± 0.040

Sizes in mm.

 

WIDTH TOLERANCES

Width tolerances for strips with sheared edges Standard slitting tolerances for Metalle Schmidt GmbH1) Width tolerances according to the EN 10140 Standard for nominal widths of:
Nominal Thickness t 3-15 15-50 50-150 >150 <125 ≥ 125 and <250 ≥250 and <600
>= < A B A B A B
0.1 0.4 ± 0.075 2) ± 0.075 2) ± 0.075 2) ± 0,10 2) ± 0.15 ± 0.10 ± 0.20 ± 0.13 ± 0.25 ± 0.18
0.4 0.7 ± 0,085 ± 0,09 ± 0,10 ± 0,12 ± 0.15 ± 0.10 ± 0.20 ± 0.13 ± 0.25 ± 0.18
0.7 1.0 ± 0.085 3) ± 0.09 3) ± 0.10 3) ± 0.12 3) ± 0.20 ± 0.13 ± 0.25 ± 0.18 ± 0.30 ± 0.20
1.0 1.5 ± 0.10 4) ± 0.10 4) ± 0.10 4) ± 0.15 4) ± 0.20 ± 0.13 ± 0.25 ± 0.18 ± 0.30 ± 0.20
1.5 2.5 on request ± 0.13 5) ± 0.15 5) ± 0.16 5) ± 0.25 ± 0.18 ± 0.30 ± 0.20 ± 0.35 ± 0.20
2.5 2.6 on request on request ± 0.16 ± 0.175 ± 0.25 ± 0.18 ± 0.30 ± 0.20 ± 0.35 ± 0.25
2.6 4.1 on request on request ± 0.16 ± 0.175 ± 0.30 ± 0.20 ± 0.35 ± 0.25 ± 0.40 ± 0.30
4.1 6.1 on request on request ± 0.16 ± 0.175 ± 0.35 ± 0.25 ± 0.40 ± 0.30 ± 0.45 ± 0.35

1) Other, closer dimensional tolerances are possible under a commercial agreement 

2) Including the value t= 0.4 

3) Including the value t= 1

4) Including the value t= 1.5

5) Including the value t= 2.5

 

LENGTH TOLERANCES

Length tolerances Closer tolerances are possible under a commercial agreement Positive tolerance in relation to the nominal length, according to the EN 10140 Standard for the
Nominal length L Class A Class B
L ≤ 1000 + 2 + 10 + 6
1000 < L ≤ 2500 +0,002L + 0.01 L + 6
L > 2500 +0,002L + 0.01 L + 0.003 L

Sizes in mm.

 

EDGE CAMBER TOLERANCES

Nominal width (w) Closer edge curve tolerances possible under a commercial agreement Edge curve tolerances according to the EN 10140 Standard
Maximum deviation 1000 mm
Thickness t Class A (Normal) (maximum deviation) Class B (FS) (Reduced) (maximum deviation)
t ≤ 1.20 mm t > 1.20 mm
3 ≤ W < 6 2.50 4.00 - -
6 < W ≤  10 2.00 3.00 - -
10 < W ≤  20 1.00 1.50 5.00 2.00
20 < W <  25 1.00 1.50 5.00 2.00
25 ≤ W < 40 1.00 1.50 3.50 1.50
40 ≤ W < 125 1.00 1.50 2.50 1.25
125 ≤ W ≤ 350 1.00 1.50 2.00 1.00
350 < W < 600 - - 2.00 1.00

Sizes in mm.

The absolute value of the tolerance can be divided within that range.

 

RIPPLE - LONGITUDINAL FLATNESS

The flatness tolerance of the strips in cut lengths in the direction of rolling must be a maximum of 10 mm over 1000 mm. Any other flatness requirement must be agreed when placing the order.
* The data contained in this catalogue are for information purposes only and are not under any circumstances, contractual supply conditions. Errors and omissions excepted.
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