Table: type_metal_data_2
Columns: usage
sn_sb
liquid_at_c
casting_at_c
remelting_at_c
hardness

Question: What is the casting temperature for a hardness of 22?
SQL: SELECT "casting_at_c" FROM type_metal_data_2 WHERE "hardness" = '22'

Question: What is the hardness for the alloy that is liquid at 243 degrees C?
SQL: SELECT "hardness" FROM type_metal_data_2 WHERE "liquid_at_c" = '243'

Question: What is the Sn/Sb percentage that is liquid at 258 degrees C?
SQL: SELECT "sn_sb" FROM type_metal_data_2 WHERE "liquid_at_c" = '258'

Question: What is the remelting temperature for the alloy that has a Sn/Sb ratio of 9.5/15?
SQL: SELECT "remelting_at_c" FROM type_metal_data_2 WHERE "sn_sb" = '9.5/15'

Question: What is the casting temperature for the alloy with hardness 21?
SQL: SELECT "casting_at_c" FROM type_metal_data_2 WHERE "hardness" = '21'