6420
Both Invar 36 and stainless steel 316 L are weldable austenitic face-centered cubic crystal structures , but stainless steel 316 L may experience chromium evaporation and Invar 36 may experience weld cracking during the welding process .
 material: Invar; material: stainless steel; material: austenitic; machanical property: crystal structures; material: stainless steel; material: chromium; material: Invar; engineering feature: weld; concept or principle: cracking; manufacturing process: welding; concept or principle: process
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: Invar, stainless steel, austenitic, crystal structures, stainless steel, chromium, Invar, weld, cracking, welding, process 
Answer:
 material: Invar; material: stainless steel; material: austenitic; machanical property: crystal structures; material: stainless steel; material: chromium; material: Invar; engineering feature: weld; concept or principle: cracking; manufacturing process: welding; concept or principle: process