We have stainless steel dumplex SUS904, orgin CHINA

Grade 904L- high alloy stainless steel is added with copper to improve its resistance to strong reducing acids, 
The specifications may not be identical for other products such as roundbar, tube and pipe, sometime have plate 
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Some of the major applications of grade 904L stainless steels include:
Wiring in electrostatic precipitators
Oil refinery components
Seawater cooling devices
Gas scrubbing plants
Pulp and paper processing industries
Acetic, phosphoric and sulphuric acid processing plants