Bohler-Uddeholm M238 VMR® P20 Plastic Lens Mold Steel

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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.
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Physical Properties	Original Value	Comments

Density	7.85 g/cc

Mechanical Properties	Original Value	Comments
Hardness, Rockwell C	54	without tempering
Tensile Strength, Ultimate	2000 MPa	at HRC 54
Modulus of Elasticity	210 GPa

Electrical Properties	Original Value	Comments
Electrical Resistivity	0.0000190 ohm-cm

Thermal Properties	Original Value	Comments
CTE, linear	12.8 µm/m-°C @Temperature 20.0 - 100 °C
	13.0 µm/m-°C @Temperature 20.0 - 200 °C
	13.8 µm/m-°C @Temperature 20.0 - 300 °C
	14.0 µm/m-°C @Temperature 20.0 - 400 °C
	14.2 µm/m-°C @Temperature 20.0 - 500 °C
	14.2 µm/m-°C @Temperature 20.0 - 600 °C
	14.5 µm/m-°C @Temperature 20.0 - 700 °C
Specific Heat Capacity	0.460 J/g-°C
Thermal Conductivity	34.0 W/m-K @Temperature 20.0 °C
	34.5 W/m-K @Temperature 100 °C
	34.5 W/m-K @Temperature 200 °C
	35.0 W/m-K @Temperature 300 °C
	35.0 W/m-K @Temperature 400 °C

Component Elements Properties	Original Value	Comments
Carbon, C	0.38 %
Chromium, Cr	2.0 %
Iron, Fe	94.52 %	As Balance
Manganese, Mn	1.5 %
Molybdenum, Mo	0.20 %
Nickel, Ni	1.1 %
Silicon, Si	0.30 %

**
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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NBUCOR41 / 98120

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