A metal object is required to have a yield strength of at least 310 MPa (45,000 psi) and a minimum ductility (% elongation; % EL) of 27%. If the metal is to be cold worked to its final shape, decide and carefully justify which (if any) of the following are candidates: copper, brass, and a 1040 steel Relevant data are attached. PLEASE SHOW ALL WORK AND EXPLANATION IF NECESSARY A metal object is required to have a yield strength of at least 310 MPa (45,000 psi) and a minimum ductility (% elongation; % EL) of 27%. If the metal is to be cold worked to its final shape, decide and carefully justify which (if any) of the following are candidates: copper, brass, and a 1040 steel Relevant data are attached. PLEASE SHOW ALL WORK AND EXPLANATION IF NECESSARY Solution Brass is the answer. Copper has a yield strength of 310MPa at percent cold work of 40. But, at percent cold work of 40, the ductility of copper is less than 10<27. Ductility of steel is less than 27% throughout. So, Brass fulfills all the criteria. .

1. A metal object is required to have a yield strength of at least 310 MPa (45,000 psi) and a
minimum ductility (% elongation; % EL) of 27%. If the metal is to be cold worked to its final
shape, decide and carefully justify which (if any) of the following are candidates: copper, brass,
and a 1040 steel Relevant data are attached. PLEASE SHOW ALL WORK AND
EXPLANATION IF NECESSARY
A metal object is required to have a yield strength of at least 310 MPa (45,000 psi) and a
minimum ductility (% elongation; % EL) of 27%. If the metal is to be cold worked to its final
shape, decide and carefully justify which (if any) of the following are candidates: copper, brass,
and a 1040 steel Relevant data are attached. PLEASE SHOW ALL WORK AND
EXPLANATION IF NECESSARY
Solution
Brass is the answer.
Copper has a yield strength of 310MPa at percent cold work of 40. But, at percent cold work of
40, the ductility of copper is less than 10<27.
Ductility of steel is less than 27% throughout.
So, Brass fulfills all the criteria.