1502
Usually , the mechanical peening process produces compressive stresses at a limited depth below the component surface , such as around 1mm in carbon steels .
 concept or principle: mechanical peening; machanical property: compressive stresses; machine or equipment: component; material: as; material: carbon steels
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:
 concept or principle: mechanical peening; machanical property: compressive stresses; machine or equipment: component; material: as; material: carbon steels