B - Temperatur-Shop
B - Temperatur-Shop
B - Temperatur-Shop
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Technical Notes Straight Thermocouples in general<br />
Reference values for the use of metallic materials for protection tubes<br />
Max. air temperature<br />
°C<br />
Material Resistance in atmosphere Nitrogenous<br />
poor in oxygen<br />
Oxydating Reducing<br />
www.temperatur-shop.de<br />
Carburization<br />
550 St 35.8 (1.0305) poor poor good ------<br />
850 X10CrAI18 (1.4571) excellent good poor good<br />
1200 X10CrAI24 (1.4762) excellent very good poor good<br />
1200 X15CrNiSi2520 (1.4841) poor poor very good poor<br />
1200 X15NiCr6015 (1.4867) poor poor very good poor<br />
Tempering Furnaces St 35.8 (1.0305)<br />
Casehardening and<br />
heating furnaces<br />
Oxidising atmosphere, sulfurous and carbonic: X10CrAI18 (1.47452) und X10CrAI24 (1.4762)<br />
Chemically aggressive steam: X10CrNiTi189 (1.4541) oder X10CrNiMoTi1810 (1.4571)<br />
Nitration furnaces Atmosphere nitrogenous, poor in oxygen: X15CrNiSi2520 (1.4841)<br />
Salt melting Salpeter up to 550 °C Pure iron M2 M2<br />
Cyan up to 950 °C Pure iron M2 M2<br />
Chloride 600 up to 1050 °C X10CrAI24 (1.4762)<br />
Metal smelting Aluminium, Magnesium up to 700 °C GG-22 (0.6022)<br />
Aluminium with magnesium up to 700 °C Pure iron M2 M2<br />
Bearing Metal up to 600 °C St 35.8 (1.0305), emailliert<br />
Lead up to 600 °C St 35.8 (1.0305) oder GG-22 (0.6022)<br />
Zinc up to 480 °C St 35.8 (1.0305), emailliert<br />
up to 600 °C Pure iron M2 M2<br />
Tin up to 600 °C St 35.8 (1.0305), emailliert<br />
Copper up to 1250 °C X10CrAI24 (1.4762)<br />
Brass up to 900 °C X10CrAI24 (1.4762)<br />
As the applications and operating conditions vary, these specifications are only reference values.<br />
Protective arrangements: The life time of the protection tubes made of carbon steel can be prolonged by coating a vitreous-enamelling or by a protective coating. As melting attacks<br />
the surface the most, the tubes can be protected by repeated changes of the immersion depth, by a muffle or a bandage made of glass fibre ribbon with water glass.<br />
Reference values for the use of ceramic protection tubes<br />
Pythagoras Type C 610* All gases, free from hydrofluoric acid and alkalic steams up to 1500 °C<br />
Alsint 99,7 Type C799* Alkali steams (glass melting and stoneware furnace) up to 1600 °C<br />
Glass melting up to 1500 °C<br />
Sillimantin 60 Type C 530* All gases, if a gastight ceramic inner tube is used up to 1600 °C<br />
The resistance to sudden changes of temperature of ceramic tubes impermeable to gas, like type C610 and type C799, is good. At high temperatures a vertical installation is<br />
required due to the poor rigidity.<br />
Resistance to sudden<br />
temperature changes<br />
Density Permanent temperature permitted<br />
Pythagoras Type C 610* good impermeable to gas 1500 °C<br />
Alsint 99,7 Type C799* good impermeable to gas 1600 °C<br />
Sillimantin 60 Type C 530* very good porous 1600 °C<br />
* Type C 799, type C 610 and type C 530 stand for the former DIN specifications Ker 710, Ker 610 und Ker 530<br />
39<br />
B