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1.1274 / C100S

1.1274 / C100S
1.1274 / C100S
1.1274 / C100S
1.1274 / C100S
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Unalloyed tool steel with 1.0% carbon. For the finest cutting edges and for making blades with hamon. Read more..


The 1.1274 is an unalloyed tool steel with 1.0% carbon. Unalloyed tool steels are often also referred to as carbon steels. 

With correspondingly abrupt quenching, the steel achieves a high initial hardness, the recommended working hardness is 60 to 62 hrc. 

Due to the complete absence of special carbide formers, 1.1274 only has a relatively low wear resistance. But this steel can be brought to a breathtaking sharpness with little effort. In addition, with correct heat treatment in the range between 60 and 62 hrc, 1.1274 offers very good toughness and cutting edge stability, which makes it particularly suitable for extremely finely ground cutting edges. 

Due to the low content of alloying elements, which have a positive effect on through hardening, the steel has a high conversion rate. This means it has to be quenched very harshly to harden it. Thanks to this fact, the steel is suitable for the production of differentially hardened blades (Hamon). 

In Damascus steel, the steel is dark gray and is suitable for producing very highly hardenable Damascus steels, which are characterized by good cutting edge stability, suitability for pressure cutting and sharpenability. Due to the complete absence of chromium, this steel can easily be conventionally fire welded.

For the 1.1274 I recommend the hardening oil Durixol V 35.

I myself do not offer a hardening service for the steels I sell. However, I can unreservedly recommend the hardening service of my colleague Jürgen Schanz. He works with a very experienced hardening shop that also carries out demanding heat treatments exactly according to customer requirements. If necessary, contact Jürgen Schanz directly via his contact form.

Available dimensions:






3,6x40x510mm = 600g

3,6x60x400mm = 680g

3,6x40x1020mm = 1180g

3,6x60x720mm = 1225g


Carbon:                      0,991%                    

Silicon:                       0,215%

Manganese:                0,505%

Phosphorus:               0,002%

Sulfur:                       0,0011%

Manufacturing method:

Smelting metallurgy

Corrosion resistance:

Not stainless.


Rolled, sandblasted, annealed


The strips are cut with a pair of guillotines and can therefore have minimal warpage, which can, however, be easily straightened.

Recommended heat treatment:

Forging: Form forging (heavy deformation) between 1100 °C and 850 °C. Fine forging (minor deformation) between 850 °C and 750 °C.

Normalize: Heat up 2x to 820 °C and allow to cool in air to below 721 °C after heating through completely.

Fine grain annealing: Heat 2x to 780 °C and after heating through, quench in oil until the glow color has disappeared. Residual cooling in the air.

Soft annealing: hold at 710 °C for approx. 30 minutes, then cool down in the furnace.

Hardening: 780 °C (3 min holding time) or 810 °C (without holding time)

Quenching: Oil, AAA-DA or Durixol V35 (recommended at 780 °C hardening temperature)

Tempering: 175°C to max. 200°C.

Achievable hardness: 59-62 hrc.

Note: A deep freeze treatment (-70 °C) between hardening and tempering can reduce the retained austenite content and thus increase the working hardness with the same toughness.

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