M4 Steel

Steel name: M4
Diagram No.: 226
UNS designation: ~T11304
JIS designation: ~SKH54
AISI/SAE designation: M4
Chemical composition in weight %: 1.33% C, 0.35% Si, 0.30% Mn, 4.30% Cr, 4.00% Mo, 4.10% V, 5.90% W
Steel group: High speed PM steel
Applications: Shaper cutters, hobs, milling cutters, broaching tools of all types, etc.
Comment: Tempering chart: specimen size: square 20 mm.
Reference: Not shown in this demo version.

Heat Treatment
Hardening: 1150 to 1200oC/oil, salt bath, vacuum
Tempering: See the diagram
Note: Diagram: Holding time 2 x 2h, specimen size 25 x 20 x 15 mm, austenitizing in salt bath.

Tempering Diagram

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Non-Metallic Inclusions in Steel

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