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Technical information sheets
- 1.0338 - DC04
- 1.1248 - C75S soft
- 1.1274 - C100S
- 1.2003 - 75Cr1
- 1.2379
- 1.3912 - Alloy I
- 1.3981 - Alloy K
- 1.4031Mo
- 1.4021 – 1.4034 – 1.4037
- 1.4310
- 1.4404
- 1.4529
- 1.4767 - heat resistant
- 1.4828 - heat resistant
- 2.0070 - Copper
- 2.0321 - Brass
- 2.1020 - Bronze
- 2.4068 - Nickel
- 2.4545 - Alloy Mu
- 2.4668 - Alloy 718
- 3.0205 - Alu
- Material information
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Unhardened, easily hardenable carbon steel W.-Nr. 1.1248 (C75S)
With a carbon content of over 0.75%, this material is very well suited for springs and wear parts that are not subject to corrosion requirements.
2. Material codes
German Norm: 1.1248 C75S+QT (former Ck75)
AISI: 1075
ASTM: G 10750
Engl. Norm: 75 (B.S. 5770 Part 1)
Franz. Norm: XC 75
Japanese Norm: C75 C CSP (Norm G 4802)
3. Alloy Composition *
C: 0,70-0,80 %
Si: 0,15-0,30 %
Mn: 0,30-0,45 %
P: max. 0,02 %
S: max. 0,02 %
Cr: ca. 0,01 %
4. Delivery condition
Condition: cold rolled, non-hardened (ferritic condition)
Surface: MA, please ask for roughness values
flatness: no data available
Ultimate tensile strength: 490-790 N/mm²
In the thicknesses 4,0+5,0mm, our material on stock is hot-rolled and sandblasted.
Further mechanical data: see chapter 7 and 8.
5. Sizes
thicknesses: 0,20-5,00 mm
raw material width: ca. 300-330 mm (see table)
edges: cut
6. Tolerances
thickness tolerace: DIN EN 10 140 and DIN EN 10 051
width tolerance: -
straightness: normal
7. Further mechanical data
Yield strength Rp0,2: ca. 360-460 N/mm²
Elongation A80: no values available
For higher operation temperatures we suggest the stainless hardened steels like the alloys 1.4031Mo (up to 0.80 mm thickness) and 1.4034 (from 1.0 to approx. 10.0 mm thickness)
8. Physical properties
Density: 7,9 g/cm³
Thermal conductivity: 35-45 W/(m °C) bei 20 °C
Heat capacity: 460 J/(kg °C) mean value at 50 – 100 °C
Thermal expansion:
10,5 x 10 -6 (between 30 - 100 °C)
11,5 x 10 -6 (between 30 - 200 °C)
12,5 x 10 -6 (between 30 - 300 °C)
Electric resistance: ca. 0,20 Ohm x mm²/m (for 1.1231= C67S hardened)
Modus of elasticity: 210 000 MPa at 20 °C
Relative permeability µr: ca. 400 (for 1.1231= C67S hardened)
9. Blanking
The alloy 1.1248 can be stamped and drawn easily in the non hardened condition.
We recommend a punch-to-die clearance of 4-10 % of the strip thickness.
The corner radius should be at least 0.25 mm and the punching die should be at least
twice the strip thickness.
The pieces should then be tumbled to receive a good edge roundness.
10. Laser cutting
As the material melts at the edge during laser cutting, a higher hardness and therefore a
lower toughness at the cutting zone is possible.
We suggest to produce critical pieces by water jet cutting.
11. Photo etching
This alloy is very easy to etch.
12. Bending
As this material need to be hardened after forming, the rolling direction is not important
regarding the bending.
Bending radius: minimum 10 times of the strip thickness.
Spring back angle: As the spring back angle depends on several factors, bending tests
are necessary. As guidance an angle of 10° at a strip thickness of
0.20 mm and an angle of 20° at a strip thickness of 0.60 mm can be
expected.
13. Flat grinding
The alloy 1.1248 is magnetisable and can be fixed by magnetic clamping devices of flat
grinding machines.
14. Welding
Due to a high content of carbon of ca. 0,75% the alloy 1.1248 should not be welded.
15. Corrosion resistance
The alloy 1.1248 is not corrosion resistant. We supply this alloy with a light oil film.
If used at normal conditions this alloy needs to be painted or galvanized.
Important Annotation
The specifications which are given in this technical information sheet about the condition
and application of the alloys are only for reference and are no confirmation about certain
performances and characteristics.
The information correspond to our own experiences and experiences of our suppliers.
We can not guarantee for the results during processing and utilisation.