BZN18-26

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. Zn is the balance. Note 4: Cu + the listed elements must total ≥99.5%; This includes a balance element; independent limits cannot be used to derive a guaranteed interval. Note 1: Bi/As/Sb need not be analyzed; the supplier guarantees that the limit is not exceeded.

Mass fraction wt%; GB/T 5231-2012, Table 5, row 32, designation C77000; scanned PDF, PDF physical page 12. Cu follows the table range, and Zn is balance. Ni+Co is a combined range and must not be split into individual Ni or Co limits. Dashes mean unspecified and are not replaced with zero. Total table-listed impurities ≤0.8%, subject to the applicable table notes. This standard provides the grade-composition basis for wrought copper-nickel alloys; actual supply and cold-heading suitability require separate confirmation. Note a to Table 5: analysis of Bi, Sb and As may be omitted, but the supplier must ensure that their contents do not exceed the limits.