Bohler-Uddeholm POLMAX® 420 Modified

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Bohler-Uddeholm POLMAX® 420 Modified - Stainless Mold Steel
Categories:	Metal; Ferrous Metal; Stainless Steel
Material Notes:	Polmax is an excellent choice for extreme surface finish requirements. This high performance grade achieves surface finishes that go well beyond conventional tool steels. Polmax is specifically engineered for cavities, cores and inserts, and a broad range of product applications that demand superior surface finish. Examples include optical, ultra clean medical applications and CD/DVD applications. POLMAX® is characterized by: Excellent polishability Good corrosion resistance Good wear resistance Good machinability Good stability in hardening
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Physical Properties	Metric	English	Comments

Density	7.81 g/cc	0.282 lb/in³	hardened to 52 HRC
	7.67 g/cc @Temperature 399 °C	0.277 lb/in³ @Temperature 750 °F	hardened to 52 HRC
	7.75 g/cc @Temperature 199 °C	0.280 lb/in³ @Temperature 390 °F	hardened to 52 HRC

Mechanical Properties	Metric	English	Comments
Hardness, Brinell	200	200	Soft annealed (Delivery condition)
Hardness, Rockwell C	30 - 58	30 - 58	tempering temp 200 - 1200°F
Tensile Strength, Ultimate	2070 MPa	300000 psi	hardened to 52 HRC
Tensile Strength, Yield	1610 MPa @Strain 0.2 %	234000 psi @Strain 0.2 %	hardened to 52 HRC
Modulus of Elasticity	200 GPa	29000 ksi	(hardened to 52 HRC)
	180 GPa @Temperature 399 °C	26100 ksi @Temperature 750 °F	hardened to 52 HRC
	190 GPa @Temperature 199 °C	27600 ksi @Temperature 390 °F	hardened to 52 HRC

Thermal Properties	Metric	English	Comments
CTE, linear	11.0 µm/m-°C @Temperature 199 °C	6.10 µin/in-°F @Temperature 390 °F	hardened to 52 HRC
	11.5 µm/m-°C @Temperature 399 °C	6.40 µin/in-°F @Temperature 750 °F	hardened to 52 HRC
Specific Heat Capacity	0.460 J/g-°C @Temperature 20.0 °C	0.110 BTU/lb-°F @Temperature 68.0 °F	hardened to 52 HRC
Thermal Conductivity	16.0 W/m-K @Temperature 20.0 °C	111 BTU-in/hr-ft²-°F @Temperature 68.0 °F	hardened to 52 HRC
	20.0 W/m-K @Temperature 199 °C	139 BTU-in/hr-ft²-°F @Temperature 390 °F	hardened to 52 HRC
	24.0 W/m-K @Temperature 399 °C	167 BTU-in/hr-ft²-°F @Temperature 750 °F	hardened to 52 HRC

Component Elements Properties	Metric	English	Comments
Carbon, C	0.38 %	0.38 %
Chromium, Cr	13.6 %	13.6 %
Iron, Fe	84.3 %	84.3 %	as balance
Manganese, Mn	0.50 %	0.50 %
Silicon, Si	0.90 %	0.90 %
Vanadium, V	0.30 %	0.30 %

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

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NBUCOR25 / 15494

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