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Bohler-Uddeholm M238 VMR® P20 Plastic Lens Mold Steel  (discontinued **)
Categories: Metal; Ferrous Metal; Tool Steel; Mold Steel

Material Notes: M238 VMR is a vacuum arc remelted, hardened and tempered plastic mold steel with excellent cleanliness for best polishability ideal for lens mold tooling. The hardness is consistent over the entire cross-section of the steel block, even in large sizes, due to the addition of nickel.
  • Minimum gas contents
  • Reduction of trace elements such as Pb, Bi, Te, As, Sn, Sb
  • Minimum microsegregations at the center of ingot
  • Low susceptibility to the formation of freckles (segregation)
  • Highly precise chemical analysis
Applications: Lens mold tooling, mold carrier frames for plastic molds, components for general mechanical engineering and tool manufacture where highest polishability and fatigue strength are required.

Vendors:
Available Properties
  • Density
  • Hardness, Rockwell C, without tempering
  • Tensile Strength, Ultimate, at HRC 54
  • Modulus of Elasticity
  • Electrical Resistivity
  • CTE, linear
  • CTE, linear
  • CTE, linear
  • CTE, linear
  • CTE, linear
  • CTE, linear
  • CTE, linear
  • Specific Heat Capacity
  • Thermal Conductivity
  • Thermal Conductivity
  • Thermal Conductivity
  • Thermal Conductivity
  • Thermal Conductivity
  • Carbon, C
  • Chromium, Cr
  • Iron, Fe, As Balance
  • Manganese, Mn
  • Molybdenum, Mo
  • Nickel, Ni
  • Silicon, Si
  
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Manufacturer Notes:
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Category Notes
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**
Materials flagged as discontinued () are no longer part of the manufacturer’s standard product line according to our latest information. These materials may be available by special order, in distribution inventory, or reinstated as an active product. Data sheets from materials that are no longer available remain in MatWeb to assist users in finding replacement materials.

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