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To die steels include tool steels with special properties designed for the manufacture of tooling, moulds, molds for metal casting of parts of stamps.
| Group | Features |
|---|---|
| die steels for cold deformation of metal | Steel designed for the manufacture of dies for stamping cold metal. After final heat treatment has a high hardness on the cutting edges and working surfaces, high wear resistance, necessary to maintain the size and shape of the working edges in the stamped, high strength working edges that act directly on the processed material and parts of the stamp, which perceive the highest torsional and bending loads |
| die steels for hot deformation of metals | Steel must maintain the required properties at very high temperatures. Their heat treatment involves getting at a lower hardness greater viscosity in comparison with the other groups of steels |
| Die steels, corrosion-resistant | Steel for forms of casting metals under pressure and matrix molds. Data of steel with properties of other steels resistant to aggressive media aggressive alloys of cast metal, reactive plastics. |
Demands on die steels
In cold and hot workability needs to succumb to the pressure treatment and machining;
The hardness, combined with high viscosity;
Good hardenability: should have a uniform high hardness, homogeneous crystalline structure in depth;
Slight by heat treatment deformation;
Low sensitivity to overheating: needs to toughen up in a rather large temperature range;
A good polishing and sanding behaviour — defines the standard surface quality of the product during stamping;
Minor sensitivity to decarburization in the process of filament winding the hardness of the surface of the working layer.
| Chemical composition in % of material | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mark | Mn | C | Ni | S | Si | P | V | Mo | Cr | W | Nb | Cu | ||
| 5KH3V3MFS | 0.2−0.5 | 0.45−0.52 | — 0.35 | to 0.03 | 0.5−0.8 | to 0.03 | 1.5−1.8 | 0.8−1.1 | 2.5−3.2 | 3−3,36 | 0.05−0.15 | to 0.3 | ||
| KH12MF | 0.15−0.45 | 1.45−1.65 | — 0.35 | to 0.03 | 0.1−0.4 | to 0.03 | 0.15−0.3 | 0.4−0.6 | 11−12,5 | - | - | to 0.3 | ||
| 4KH5V2FS | 0.15−0.45 | 0.35−0.45 | — 0.35 | to 0.03 | 0.8−1.2 | to 0.03 | 0.6−0.9 | - | 4.5−5.5 | 1.6 — 2.2 | - | to 0.3 | ||
| Hardness after annealing KH12MF, MPa | HB 10 -1 = 255 | |||||||||||||
| Hardness after annealing 5KH3V3MFS, MPa | HB 10 -1 = 229 — 241 | |||||||||||||
| Hardness after annealing 4KH5V2FS, MPa | HB 10 -1 = 241 | |||||||||||||
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