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The Vanadis 4 Extra from Uddeholm is characterized by an extremely good combination of wear resistance and toughness. It reaches a working hardness of max. 62hrc. Compared to 1.3253 and Vanadis 23 SuperClean, it has lower wear resistance but at the same time offers significantly better toughness. This makes it suitable for both powerful working knives and finely ground laser kitchen knives.
The "carefree steel" among the PM steels.
In the areas of hardness, toughness and wear resistance, the Vanadis 4 Extra is only slightly behind the high-performance PM steel "CPM-MagnaCut". However, the Vanadis 4 Extra is not resistant to corrosion. If the lack of corrosion resistance is not an exclusion criterion, the Vanadis 4 Extra can be a cost-effective alternative to the CMP-MagnaCut.
The steel can be forged between 1100 and 900 degrees with full heating. Under no circumstances should the steel be cooled in oil. Even cooling the blank on the cold anvil can lead to distortion or cracking. However, the steel must be soft annealed at high temperatures and with a long holding time. The blanks must therefore be protected against oxidation and decarburization, e.g. with hardening foil or the use of an inert gas furnace. In addition, the forged blanks should always be manufactured with sufficient oversize to be able to grind off decarburized areas after soft annealing.
Hardening is complex and requires high hardening and tempering temperatures, controlled quenching conditions, protection against oxidation and decarburization, and precise observance of heating and holding times. Unless you have the necessary infrastructure and experience to harden PM steels, I recommend using the services of a hardening shop.
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.
3,9x40x654mm = 780g
3,9x60x654mm = 1190g
3,9x100x654mm = 1980g
5,4x40x653mm = 1080g
5,4x100x653mm = 2670g
The flat material is cut from the sheet metal with the laser cutter. Superficial oxidation and hardening can therefore occur at the cut edge. This structural change is only a few hundredths of a millimeter thick and can easily be ground off. The actual dimensions of the material can deviate by a maximum of 1% from the specified dimensions. This is related to the manufacturing tolerances of various suppliers.
|Recommended heat treatment:||
Forging: between 900 °C and 1150 °C
Soft anneal: heating up at 900°C, then controlled cooling to 650°C at a maximum of 10°C per hour. Remainder furnace cooling. Caution, be sure to protect against oxidation and decarburization.
Austenitizing: 1020 °C or 1100 °C
Holding time: 30 Min (1020 °C) / 30 Min (1100 °C)
Quenching: Hot bath at 200-550 °C (recommended) or in a gas stream with at least 2 bar overpressure
Tempering: 3 times for 1 hours each at 525 °C with intermediate cooling to room temperature.
Achievable hardness: 62 hrc. (1020 °C) / 64 hrc. (1100 °C)