QSN4-4-4

Mass fraction wt%; Under 2.2, elements with specified lower and upper limits are alloying constituents; a single value is a minimum for copper and a maximum for other elements. A dash means unspecified; it is not entered as zero; Cu+Ag and Ni+Co are subject to combined ranges and are not converted into independent element ranges. The balance remains a balance; subtracting independent maxima does not establish a guaranteed range. Total impurities include all relevant impurities; The sum of listed elements is only a necessary condition and cannot replace complete impurity analysis. Product forms in the original document define the applicable wrought-product scope; they do not establish confirmed supply of cold-heading wire or final properties. Cu is the balance, except for QFe2.5 with an explicit Cu minimum and QTe0.5 with a minimum combined Cu+Te+Sn. Note 1: As/Sb/Bi need not be analyzed, but the supplier must guarantee that the specified limits are not exceeded. Note 5: nickel present as an impurity in tin bronze and aluminum bronze is included in copper content; Cu is the balance in this table; no independent Cu limit is invented. Total impurities ≤.2%; major alloying elements are not simply added together.

Mass fraction wt%; GB/T 5231-2012, Table 4, row 19, designation T53500; scanned PDF, PDF physical page 10. Cu is balance; dashes mean unspecified and are not replaced with zero. The total of table-listed impurities is ≤0.2%, subject to the applicable table notes. This standard provides the grade-composition basis for wrought copper and copper alloys; actual supply and cold-heading suitability require separate confirmation.