Bohler-Uddeholm UDDEHOLM RAMAX® S Modified 420F

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Bohler-Uddeholm UDDEHOLM RAMAX® S Modified 420F (discontinued **)
Categories:	Metal; Ferrous Metal; Stainless Steel
Material Notes:	Chromium alloyed stainless holder steel A pre-hardened stainless holder steel with excellent machinability, high tensile strength and good corrosion resistance. RAMAX® S is characterized by: Excellent machinability Good corrosion resistance Uniform hardness in all directions Good indentation resistance Applications: Holders/bolsters for plastic molds. RAMAX S in combination with STAVAX ESR or ELMAX as insert material gives a completely corrosion resistant mold. Plastic and rubber molds with low requirements on polishability. Dies and callipers for plastic extrusion. Constructional parts
Key Words:	AISI 420F
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Physical Properties	Original Value	Comments

Density	0.282 lb/in³	hardened and tempered to 340 HB
	0.280 lb/in³ @Temperature 199 °C	hardened and tempered to 340 HB

Mechanical Properties	Original Value	Comments
Hardness, Brinell	340	Hardened and tempered (Delivery condition)
	300 - 500	tempering temp 200-1200°F
Tensile Strength, Ultimate	159500 psi	(hardened to 340 HB)
	145000 psi @Temperature 199 °C	(hardened to 340 HB)
Tensile Strength, Yield	132000 psi @Strain 0.2 %	68°F (hardened to 340 HB)
	119000 psi @Strain 0.2 %, Temperature 199 °C	hardened to 340 HB
Elongation at Break	10 %	(hardened to 340 HB)
	10 % @Temperature 199 °C	hardened to 340 HB
Reduction of Area	30 % @Temperature 199 °C	hardened to 340 HB
	30 % @Temperature 20.0 °C	hardened to 340 HB
Modulus of Elasticity	29000 ksi	68°F, (hardened and tempered to 340 HB)
	27600 ksi @Temperature 199 °C	hardened and tempered to 340 HB
Impact Test	11.0 ft-lb	hardened and tempered to 340 HB
	18.0 ft-lb @Temperature 199 °C	hardened and tempered to 340 HB

Thermal Properties	Original Value	Comments
CTE, linear	6.10 µin/in-°F @Temperature 199 °C	hardened and tempered to 340 HB
Specific Heat Capacity	0.110 BTU/lb-°F @Temperature 20.0 °C	hardened and tempered to 340 HB
Thermal Conductivity	23.0 W/m-K @Temperature 199 °C	hardened and tempered to 340 HB

Component Elements Properties	Original Value	Comments
Carbon, C	0.33 %
Chromium, Cr	16.7 %
Iron, Fe	81.2 %	as balance
Manganese, Mn	1.35 %
Silicon, Si	0.35 %
Sulfur, S	0.12 %

**
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NBUCOR27 / 15496

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