Basics
Table 5.1 Transmission Capabilities with High-Temperature Lubricants
Calculation 1
Operating Temperature
Up to 150°C
MAX
150°C to 200°C 200°C to 250°C
MAX x 3/4 MAX x 1/2
Over 250°C Out of Use 1 MAX = Maximum allowable load as shown in the manufacturer’s catalog
5.1.2 Use of Steel Chains in Low Temperatures When you use chains in low temperatures, the following problems may occur: • Decrease in shock strength due to low-temperature brittleness. • Lubricant solidification. • Stiff joints caused by frost or ice. Table 5.2 shows the power transmission capacity of drive chains at low temperatures.
Table 5.2 Transmission Capabilities of Chains at Low Temperatures
Standard Roller Chain (RS80) 1
KT Type 1 Out of use MAX x 1/2 MAX x 2/3
Operating Temperature
Below -60°C -60°C to -50°C -50°C to -40°C -40°C to -30°C -30°C to -20°C -20°C to -10°C -10°C to +60°C
Out of use Out of use Out of use MAX x 1/4 MAX x 1/3 MAX x 1/2
MAX MAX MAX MAX
MAX
1 MAX = Maximum allowable load as shown in the manufacturer’s catalog
Two types of chain are especially useful at lower temperatures. KT-specifica- tion chain is specially heat-treated to withstand very cold environments. SS- specification chain, which is made of 304 stainless steel, may also be used at low temperatures. Low-temperature brittleness does not occur in austenitic stainless steel. These chains cannot fix the problems of solidification of the lubricant or stiff joints caused by frost or ice. Use cold-temperature oil or grease and apply it to the inner clearances and the outside of the chain. 5.2 ENGINEERED PLASTIC CHAIN IN HIGH AND LOW TEMPERATURES Standard engineered plastic chain can be run at temperatures between -20˚C and 80˚C. At higher temperatures, it may become soft and not keep its shape; at lower temperatures it may become brittle. KV-specification super engineered plastic chain may be used for continuous driving up to 250˚C. Consult the manufacturer regarding KV specification, because the available chain types and sizes are limited.
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