Material Datasheet                                                                                Issue: October 2015

Download datasheet here:

https://sbc-trading.fr/images/Image/File/Precision-gauge-strip-AISI-1095.pdf

Hardened Spring Steel W.-Nr. 1.1274

1. Applications:

With a carbon content of over 1%, this material is very well suited for feeler gauge strips and precision foils as well as highly stressed springs that are not subject to any corrosion requirements. In particularly high-quality designs,

as the only carbon steel, 1.1274 is suitable for shock absorbers and flapper valves.

Further applications: wear bars, doctor blades

The alloy 1.1274 is suitable for springs according to DIN 17 222 (new: DIN EN 10 132-4).

In thicknesses of more than 1.0 mm we can supply the hardened tool steel W.-Nr. 1.2003.

2.  Material codes:

German Norm:             1.1274 C100S+QT (former known as Ck101) AISI:                      1095

ASTM:                           G 10950

Engl. Norm:                  95 (B.S. 5770 Part 1)

Franz. Norm:                XC100

Japan. Norm:               SK 4-CSP (Norm G 4802)

3.  Chemical composition: *

* the exact composition of each batch can be documented by a material certificate

2.2 or 3.1 according to DIN EN 10 204.

4.  Delivery condition:

Condition:                     hardened and tempered (martensitic structure) Surface:white polished, please ask for Ra-values

Flatness:                       mostly P2 (max. 0,30% of the strip width)

Tensile strength:         see table (from 1400-1600 to 2000-2200 N/mm² depending on thethickness)

Further mechanical data: see chapter 7 and 8.

5.  Sizes:

Thicknesses:                0.02-2.00 mm (between 1.10 and 2.00mm only width 12.7mm)

Raw material width:    from 12.7 up to 305 mm (see table)

Standard widths:         6 – 12.7 – 25 – 50 and 305 mm (not in all thicknesses)

Edges:                           in widths 6 and 12.7 mm round edges in thicchnesses from

0.25 to 2.0mm, all other sizes with cut edges

The following sizes are available from stock (without obligation), status: October 2015:

In the thicknesses from 1.0 to 5.03 mm we have the hardened tool steel 1.2003 (75Cr1) on stock.

6.  Tolerances:

Thickness tolerance: T3 Widthtolerance:       B2

Straightness:                normal

Flatness:                       P3 = 0,2% of the strip width

7.  Further mechanical data:

Yield str. Rp0,2 :         approx. 90 % of the tensile strength ElongationA 80:       no data available

Fatigue strength:         high fatigue strength, suitable for shock absorber valves and flappervalves

If good tumbling is done, the following values can be achieved: Reversed bending stress (Mean stress = 0):

620-680 MPa at a failure rate of 5 %.

Fluctuating bending stress (Minimum stress = 0):

520-580 MPa at a failure rate of 5 %

As the fatigue strength depends on different factors like the corrosive conditions and the edge treatment, no definitive endurance limit values can be guaranteed.

Please ask if the requested batch meets the high demands for shock absorber valves or compressor valves.

The operation temperature should not exceed 200°C.

Please remember that the modus of elasticity decreases at higher temperatures.

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 (for the alloy 1.1248 = C75S)

Density:                                 7,9 g/cm³

Thermal conductivity:          49 W/(m °C) at 20 °C

Spec. heat capacity:           460 J/(kg °C) mean value at 50 – 100 °C Thermalexpansion:       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:              approx. 0,20 Ohm x mm²/m (for 1.1231= C67S hardened)

Modus of elasticity:             210 000 MPa at 20 °C

Relative permeability µr:    maximum 400 (for 1.1231= C67S hardened)

9.  Blanking

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.

After blanking a stress relieving at a maximum temperature of 250°C for 30-60 minutes is suggested.

The pieces should then be tumbled to receive a good edge roundness. We suggest to produce the pieces by photo etching.

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.