Bohler-Uddeholm UDDEHOLM STAVAX® SUPREME Modified 420

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Bohler-Uddeholm UDDEHOLM STAVAX® SUPREME Modified 420 (discontinued **)
Categories:	Metal; Ferrous Metal; Stainless Steel
Material Notes:	Cr-Ni-Mo-V alloyed Stavax® Supreme is an ESR re-melted tool steel, this provides a very pure material, with a minimum of inclusions. Purity is a requirement to be able to achieve the desired surface finish; it also contributes to better toughness. This grade is the right choice for larger tools where corrosion in production is unacceptable and where the requirements for good surface finish are high. Stavax® Supreme is characterized by: Good corrosion resistance Excellent through-hardening properties Good ductility and toughness Good wear resistance Excellent polishability
Key Words:	AISI 420 modified
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Physical Properties	Original Value	Comments

Density	0.280 lb/in³	hardened to 50 HRC

Mechanical Properties	Original Value	Comments
Hardness, Brinell	250	Annealed (Delivery condition)
Hardness, Rockwell C	42 - 53	temper temp 390-1020°F (2 x 2h)
Tensile Strength, Ultimate	218000 psi	hardened to 45 HRC
	258000 psi	hardened to 50 HRC
Tensile Strength, Yield	174000 psi @Strain 0.2 %	hardened to 45 HRC
	187000 psi @Strain 0.2 %	hardened to 50 HRC
Modulus of Elasticity	30500 ksi	(hardened to 50 HRC)
	26100 ksi @Temperature 399 °C	hardened to 50 HRC
	29000 ksi @Temperature 199 °C	hardened to 50 HRC
Impact Test	73.0 - 166 ft-lb	temper temp 390-1020°F (2 x 2h)

Thermal Properties	Original Value	Comments
CTE, linear	6.10 µin/in-°F @Temperature 199 °C	hardened to 50 HRC
	6.70 µin/in-°F @Temperature 399 °C	hardened to 50 HRC
Specific Heat Capacity	0.110 BTU/lb-°F @Temperature 20.0 °C	hardened to 50 HRC
Thermal Conductivity	20.0 W/m-K @Temperature 199 °C	hardened to 50 HRC
	24.0 W/m-K @Temperature 399 °C	hardened to 50 HRC

**
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NBUCOR28 / 15497

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