HPB61-1

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; Total impurities exclude elements specified as alloying constituents; all listed elements must not simply be added together. Corresponding foreign grade designation shown in the original table: C37100; Note 4 includes Ni, other than the principal constituents, in Cu, subject to the combined Cu+Ni limit; This does not establish automatic substitution across standards. Note 5/6/7 requires Cu and the listed elements to total ≥99.6%; This includes a balance element; independent limits cannot be used to derive a guaranteed range. Table 2, note 1: Fe≤0.030% applies to nonmagnetic brass only where nonmagnetic performance is expressly required; Ordinary conditions are not automatically tightened.

Mass fraction wt%; GB/T5231—2012, Table 3, row 26, designation C37100. Zn is balance. Total table-listed impurities ≤0.55%; confirm the calculation scope under clause 2.3 and the row footnotes. A partial sum of listed elements does not replace complete analysis. Note a to Table 3: Fe≤0.030% for nonmagnetic brass applies only to that condition, not to this leaded-brass row. Clause 2.2: unlisted elements are not assigned zero. Clause 2.4: balance Zn must not be mechanically converted into a guaranteed range.