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	Original Value	Comments

Density	0.282 lb/in³	hardened to 52 HRC
	0.277 lb/in³ @Temperature 399 °C	hardened to 52 HRC
	0.280 lb/in³ @Temperature 199 °C	hardened to 52 HRC

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

Thermal Properties	Original Value	Comments
CTE, linear	6.10 µin/in-°F @Temperature 199 °C	hardened to 52 HRC
	6.40 µin/in-°F @Temperature 399 °C	hardened to 52 HRC
Specific Heat Capacity	0.110 BTU/lb-°F @Temperature 20.0 °C	hardened to 52 HRC
Thermal Conductivity	16.0 W/m-K @Temperature 20.0 °C	hardened to 52 HRC
	20.0 W/m-K @Temperature 199 °C	hardened to 52 HRC
	24.0 W/m-K @Temperature 399 °C	hardened to 52 HRC

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

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NBUCOR25 / 15494

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