Chemical Composition Base Element Fe (Iron) Mechanical Properties Brinell Hardness 229 to 255 Other Information Material Class Ferrous Alloy Alloy Family Tool Steel Alloy Group High-speed tool steel Alloy Sub-Group Molybdenum high-speed steel Country USA Standards Body SAE (USA) Description High speed tool steels, Mo-W 6-6-4; ann condition. Designation M4 Specification Type Standard Specification SAE J437 Specification Year 1970 Specification Status Active Specification Status Notes active 1970 Source Worldwide Guide to Equivalent Irons and Steels, 5th ed. ASM International 2006 Available forms Wrought Links Organizations SAE, International (SAE) (SAE J)
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Chemical Composition

Mechanical Properties

229 to 255

Other Information