3004 series aluminum manganese alloy aluminum sheet also belong to a series of more than 3003 high strength, excellent formability, good corrosion resistance, require a higher intensity than the 3003 alloy parts. 
 3004 for the AL-Mn alloy is the most widely used kind of anti-rust aluminum, the strength of this alloy is not high (slightly higher than the pure aluminum), heat treatment can not be strengthened, so the use of cold working methods to improve its mechanical properties: In the annealed condition has a high plasticity, work hardening of the plastic in half is still good, cold hardening of the plastic is low, good corrosion resistance, good weldability, cutting performance can be poor. Purpose is mainly used for high plasticity and good weldability, liquid or gas medium in the low-load working parts, such as email, gasoline or lubricating oil duct, a variety of liquid containers and other deep-drawing made with a small load parts: wire used to make rivets