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In this study , 420 stainless steel pre-alloyed with Nb ( 1.2 wt. % ) and Mo ( 0.57 wt. % ) was processed by L-PBF and characterized in terms of its physical , mechanical and corrosion properties as well as microstructure .
 420 stainless steel, Nb, Mo, processed, L-PBF, mechanical, corrosion properties, as, as
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:
 420 stainless steel, Nb, Mo, processed, L-PBF, mechanical, corrosion properties, as, as