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In the present study , 420 stainless steel parts with different porosities in the range of ∼6 % to ∼ 54 % were fabricated via the binder jet printing technology followed by pre-sintering between 1000 and 1400 °C .
 420 stainless steel, porosities, range, fabricated, binder, printing technology, pre-sintering
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, porosities, range, fabricated, binder, printing technology, pre-sintering