Sandvik 2R68/2R68HV Seamless tube and pipe

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Sandvik 2R68/2R68HV Seamless tube and pipe
Categories:	Metal; Ferrous Metal; Austenitic; Stainless Steel
Material Notes:	Sandvik 2R68 is a molybdenum alloyed austenitic chromium-nickel steel. It is characterized by low contents of manganese, sulphur, carbon and nitrogen. This results in a very clean steel with a low content of non-metallic inclusions. The grade is especially developed for a application where very high demands are set upon allowed limits of contamination from the stainless steel material. Typical examples are applications found within the semiconductor and pharmaceutical industries. The steel is available in two forms: Sandvik 2R68, produced by conventional AOD technique, and Sandvik 2R68HV, further optimized by vacuum arc remelting (VAR) of the AOD material. The VAR treatment reduces the content of oxide inclusions, thereby obtaining further cleanliness. Otherwise the two grades generally have similar properties. Electropolishing of the grade produces very even and smooth surfaces, thanks to the very low levels of impurities. The tubes are used in the electropolished condition for high purity gas distribution systems. Information provided by Sandvik ASTM 316L; EN 1.4435
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Physical Properties	Original Value	Comments

Density	8.00 g/cc

Mechanical Properties	Original Value	Comments
Hardness, Vickers	155
Tensile Strength, Ultimate	490 - 690 MPa
Tensile Strength, Yield	>= 190 MPa @Strain 0.2 %
	>= 225 MPa @Strain 1 %
	>= 100 MPa @Strain 0.2 %, Temperature 500 °C
	>= 118 MPa @Strain 0.2 %, Temperature 300 °C
	>= 128 MPa @Strain 1 %, Temperature 500 °C
	>= 145 MPa @Strain 1 %, Temperature 300 °C
Elongation at Break	>= 40 %
	>= 35 % @Thickness 50.8 mm
Modulus of Elasticity	200 GPa
	165 GPa @Temperature 500 °C
	179 GPa @Temperature 300 °C

Thermal Properties	Original Value	Comments
CTE, linear	17.0 µm/m-°C @Temperature 30.0 - 100 °C
	17.0 µm/m-°C @Temperature 30.0 - 200 °C
	21.0 µm/m-°C @Temperature 30.0 - 500 °C
Specific Heat Capacity	0.485 J/g-°C @Temperature 20.0 °C
	0.515 J/g-°C @Temperature 200 °C
	0.540 J/g-°C @Temperature 400 °C
	0.575 J/g-°C @Temperature 600 °C
Thermal Conductivity	14.0 W/m-K @Temperature 20.0 °C
	17.0 W/m-K @Temperature 200 °C
	20.0 W/m-K @Temperature 400 °C
	23.0 W/m-K @Temperature 600 °C

Component Elements Properties	Original Value	Comments
Carbon, C	<= 0.020 %
Chromium, Cr	17.5 %
Iron, Fe	63.9 %	As Balance
Manganese, Mn	<= 0.40 %
Molybdenum, Mo	2.6 %
Nickel, Ni	14.5 %
Phosphorus, P	<= 0.030 %
Silicon, Si	<= 1.0 %
Sulfur, S	<= 0.0030 %

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NSANDV227 / 19121

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