953
Also , the ductility of the alloy is significantly improved with the designed quenching and tempering method , and competitive mechanical properties are achieved when tempering temperature reaches 650 °C .
 ductility, alloy, designed, tempering, mechanical properties, tempering, temperature
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 ductility, alloy, designed, tempering, mechanical properties, tempering, temperature