BALDER Steel

BALDER Steel

Steel name: BALDER
Diagram No.: 2191
Chemical composition in weight %: 0.30% C, 0.20% Si, 1.20% Mn, 2.30% Cr, 0.80% Mo, 0.80% V, 4.00% Ni
Steel group: Tool steels
Properties: No data
Applications: Indexable insert drills and milling cutters. Milling chucks and tool tapers. Engineering components with severe demands on high temperature strength.
Reference: Not shown in this demo version.

Heat Treatment
Hardening: Austenitizing temperature: 900–1050°C (1650– 1920°F), normally 960–1020°C (1760–1870°F). Quenching media: High speed gas/circulating atmosphere. Vacuum (high speed gas with sufficient positive pressure). An interrupted quench at 320–450°C (610–840°F) is recommended where distortion control and quench cracking are a concern. Martempering bath or fluidized bed at 450–550°C (840–1020°F), then cool in air. Martempering bath or fluidized bed at approx. 180–200°C (360–390°F), then cool in air. Warm oil, approx. 80°C (180°F).
Note 1: Temper the tool as soon as its temperature reaches 50–70°C (120–160°F).
Note 2: In order to obtain the optimum properties of the tool, the cooling rate should be fast, but not at a level that gives excessive distortion or cracks.
Tempering: Choose the tempering temperature according to the required hardness by reference to the tempering graph. Temper twice with intermediate cooling to room temperature. The lowest tempering temperature is 200°C (390°F). Holding time at temperature is minimum 2 hours. To avoid “temper brittleness”, do not temper in the range 500–550°C (930–1020°F), see graph.
Diagram note: Bellow empering 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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Non-Metallic Inclusions in Steel
Semiconductor Etchants

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