W400 VMR is a low silicon, chromium-vanadium modified H11 type hot work tool steel which has been vacuum remelted to obtain the highest uniformity, the best cleanliness of tool steel. The material is characterized:

  • Extremely high toughness, with a minimum of 18 ft-lbs Room temperature Charpy V notch toughness levels as tested by the NADCA #207 specification and meets Grade E of that document.
  • Good general wear resistance, capable of achieving up to 52 HRC
  • Good hot wear resistance with higher hardness
  • Very good thermal conductivity
  • Excellent polishability
  • Extremely good uniformity of properties in all directions


  • Heavy duty hot work tools and dies, aluminum and zinc, where cracking is a major issue
  • Mandrels, dies, and containers for metal tube and rod extrusion
  • Hot extrusion dies
  • Hot shear blades
  • Plastic molds requiring high polishability
  • Molds requiring improved cycle times
  • Cold work tooling with severe cracking issues
Title Type/Filesize Download

W400 VMR Data Sheet (Rev. 7.2007)

PDF / 289 KB PDF Download

W400 VMR Heat Treatment (Rev. January 18, 2017)

PDF / 32 KB PDF Download

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