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	Metric	English	Comments

Density	7.75 g/cc	0.280 lb/in³	hardened to 50 HRC

Mechanical Properties	Metric	English	Comments
Hardness, Brinell	250	250	Annealed (Delivery condition)
Hardness, Rockwell C	42 - 53	42 - 53	temper temp 390-1020°F (2 x 2h)
Tensile Strength, Ultimate	1500 MPa	218000 psi	hardened to 45 HRC
	1780 MPa	258000 psi	hardened to 50 HRC
Tensile Strength, Yield	1200 MPa @Strain 0.2 %	174000 psi @Strain 0.2 %	hardened to 45 HRC
	1290 MPa @Strain 0.2 %	187000 psi @Strain 0.2 %	hardened to 50 HRC
Modulus of Elasticity	210 GPa	30500 ksi	(hardened to 50 HRC)
	180 GPa @Temperature 399 °C	26100 ksi @Temperature 750 °F	hardened to 50 HRC
	200 GPa @Temperature 199 °C	29000 ksi @Temperature 390 °F	hardened to 50 HRC
Impact Test	99.0 - 225 J	73.0 - 166 ft-lb	temper temp 390-1020°F (2 x 2h)

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 50 HRC
	12.1 µm/m-°C @Temperature 399 °C	6.70 µin/in-°F @Temperature 750 °F	hardened to 50 HRC
Specific Heat Capacity	0.460 J/g-°C @Temperature 20.0 °C	0.110 BTU/lb-°F @Temperature 68.0 °F	hardened to 50 HRC
Thermal Conductivity	20.0 W/m-K @Temperature 199 °C	139 BTU-in/hr-ft²-°F @Temperature 390 °F	hardened to 50 HRC
	24.0 W/m-K @Temperature 399 °C	167 BTU-in/hr-ft²-°F @Temperature 750 °F	hardened to 50 HRC

**
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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NBUCOR28 / 15497

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