Sleipner Steel

Sleipner Steel

Steel name: Sleipner
Diagram No.: 2753
Chemical composition in weight %: 0.90% C, 0.90% Si, 0.50% Mn, 7.80% Cr, 2.50% Mo, 0.50% V
Steel group: Cold work tool steels
Properties: Uddeholm Sleipner is a chromium-molybdenum- vanadium alloyed tool steel.
Applications: Uddeholm Sleipner is a general purpose steel for cold work tooling. It has a mixed-abrasive wear profile and a good resistance to chipping. Furthermore a high hardness (>60 HRC) can be obtained after high temperature tempering. This means that surface treatments such as nitriding or PVD can be made on a high strength substrate. Also, it means that complicated shapes with hardness levels >60 HRC can be wire EDM’d from blocks with relatively thick cross-sections with a much reduced risk of cracking. Uddeholm Sleipner is recommended for medium run tooling applications where a resistance to mixed or abrasive wear and a good resistance to chipping are required.
Reference: Not shown in this demo version.

Heat Treatment
Hardening: Preheating temperature: 600–650°C (1110– 1200°F) and 850–900°C (1560–1650°F). Austenitizing temperature: 950–1080°C (1740– 1980°F) but usually 1030–1050°C (1890– 1920°F).
Quenching media: Vacuum (high speed gas with sufficient overpressure minimum 2 bar). Martempering bath or fluidized bed at approx. 200–550°C (390–1020°F). Forced air/gas.
Note: Temper the tool as soon as its temperature reaches 50–70°C (120–160°F).
Holding time: 30 minutes Note: Holding time = time at hardening temperature after the tool is fully heated through. A holding time of less than recommended time will result in loss of hardness.
Tempering: Choose the tempering temperature according to the hardness required by reference to the tempering graph. Temper at least twice with intermediate cooling to room temperature. For highest dimensional stability and ductility, a minimum temperature of 540°C (1000°F) and three tempers is strongly recommended. Tempering at a lower temperature than 540°C (1000°F) may increase the hardness and compressive strength to some extent but also impair cracking resistance and dimensional stability. However, if lowering the tempering temperature, do not temper below 520°C (970°F). When tempering twice the minimum holding time at temperature is 2 hours. When tempering three times the minimum holding time is 1 hour.
Diagram note: Bellow tempering curves are obtained after heat treatment of samples with a size of 15 x 15 x 40 mm, cooling in forced air. Lower hardness can be expected after heat treatment of tools and dies due to factors like actual tool size and heat treatment parameters.

Tempering Diagram

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