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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 .
 material: 420 stainless steel; machanical property: porosities; process parameter: range; concept or principle: fabricated; material: binder; enabling technology: printing technology; manufacturing process: pre-sintering
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: 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} 
 Entities: 420 stainless steel, porosities, range, fabricated, binder, printing technology, pre-sintering 
Answer:
 material: 420 stainless steel; machanical property: porosities; process parameter: range; concept or principle: fabricated; material: binder; enabling technology: printing technology; manufacturing process: pre-sintering