Bohler-Uddeholm BÖHLER M268 VMR® Plastic Mold Steel

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Bohler-Uddeholm BÖHLER M268 VMR® Plastic Mold Steel
Categories:	Metal; Ferrous Metal; Tool Steel; Mold Steel
Material Notes:	Description: HBÖHLER M268 VMR is a hardened and tempered plastic mould steel with excellent cleanliness for best polishability. The hardness is constant over the entire cross-section of the steel block, even at large sizes, due to the addition of nickel. Applications: Moulds for plastics processing, components for general mechanical engineering and tool manufacture where highest polishability and fatigue strength are required.
Key Words:	EN 1.2738; AISI P20; 40CrMnNiMo8-6-4
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Physical Properties	Original Value	Comments

Density	7.85 g/cc

Mechanical Properties	Original Value	Comments
Hardness, Brinell	310 - 350
Modulus of Elasticity	210 GPa

Thermal Properties	Original Value	Comments
CTE, linear	12.8 µm/m-°C @Temperature 100 °C
	13.0 µm/m-°C @Temperature 200 °C
	13.8 µm/m-°C @Temperature 300 °C
	14.0 µm/m-°C @Temperature 400 °C
	14.2 µm/m-°C @Temperature 500 °C
	14.2 µm/m-°C @Temperature 600 °C
	14.5 µm/m-°C @Temperature 700 °C
Specific Heat Capacity	0.110 BTU/lb-°F
Thermal Conductivity	28.0 W/m-K @Temperature 700 °C
	31.1 W/m-K @Temperature 600 °C
	32.8 W/m-K @Temperature 500 °C
	33.9 W/m-K @Temperature 400 °C
	34.3 W/m-K @Temperature 20.0 °C
	34.8 W/m-K @Temperature 300 °C
	35.1 W/m-K @Temperature 100 °C
	35.3 W/m-K @Temperature 200 °C

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

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NBUCOR69 / 133742

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