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It was established that PWHTs may improve the Z-strength level by the factor of ~3÷3.5 ( from ~46 to 177 MPa ) .
 manufacturing process: PWHTs; machanical property: Z-strength; concept or principle: MPa
Please list all entity words in the text that fit the category.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} 
Answer:
 manufacturing process: PWHTs; machanical property: Z-strength; concept or principle: MPa