Mirrax 40 Steel

Mirrax 40 Steel

Steel name: Mirrax 40
Diagram No.: 2760
AISI/SAE designation: 420 modified
Chemical composition in weight %: 0.21% C, 0.90% Si, 0.45% Mn, 13.50% Cr, 0.20% Mo, 0.60% Ni, 0.25% V, +N
Steel group: Plastic mould steels
Properties: Uddeholm Mirrax 40 is a remelted stainless tool steel supplied prehardened to 40 HRC. Uddeholm Mirrax 40 is produced using the electroslag remelting (ESR) process – an additional step in the steelmaking process that ensures very clean steel with low sulphur content (0.003% max.) and non-metallic inclusions. Consequently, Uddeholm Mirrax 40 is capable of being polished to a very high surface finish.
Applications: Injection moulds for corrosive and noncorrosive plastics. Plastic moulding of high surface finish products (e.g., Bezels and casings for TV and computers). Blow moulding of corrosive plastics or high surface finish transparent products (e.g. PET bottles). Extrusion dies. Constructional parts.
Reference: Not shown in this demo version.

Heat Treatment
Hardening: Note: It is recommended to do soft annealing before hardening. Preheating temperature: 500–600°C (930–1110°F). Austenitizing temperature: 1000–1025°C (1830– 1880°F) but usually 1020°C (1870°F). The steel should be heated through to the austenitizing temperature and held at temperature for 30 minutes.
Quenching media: Vacuum with sufficient positive pressure. High speed gas/circulating atmosphere In order to obtain the optimum properties, the cooling rate should be as fast as possible within acceptable distortion limits. Temper the tool as soon as its temperature reaches 50–70°C (120–160°F).
Tempering: Choose the tempering temperature according to the hardness required by reference to the tempering graph. Temper minimum twice with intermediate cooling to room temperature. Lowest tempering temperature 250°C (480°F). Holding time at temperature minimum 2 hours.
Diagram note: The tempering curve is approximate. 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

Price: 20.00 US $
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Other Steel Data links
Carbides in Steel
CCT and TTT Diagrams of Steels
CCT and TTT Diagram Calculating Service
Hardenability Diagrams of Steels
Hardenability Calculating Service
Macro Defects in Steel
Metal Etchants
Non-Metallic Inclusions in Steel
Semiconductor Etchants

Disclaimer: The material data is a central depository of information based on global actual tests and calculated software data that is available to the public for a fee. The information and data presented herein are typical or average values and are not a guarantee of maximum or minimum values. Applications specifically suggested for material described herein are made solely for the purpose of illustration to enable the reader to make his own evaluation and are not intended as warranties, either express or implied, of fitness for these or other puposes. There is no representation that the recipient of this literature will receive updated editions as the become available.