5069
The low alloy steel AISI 4140 ( German grade 42CrMo4 ) is one of the most frequently used Quench & Tempering ( Q & T ) steels with a wide range of applicability .
 alloy steel, Tempering, steels, range
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:
 alloy steel, Tempering, steels, range