H70
2 source records. Standards, editions and conditions are presented separately; matching grade names do not establish interchangeability.
Refer to each source for mass fractions and analysis type. Missing values are not treated as 0. Manufacturer typical values, standard guarantees and measured heat results must remain separate. Use the material selector for calculations and condition selection.
Open condition selection, comparison and carbon-equivalent tools for H70 →H70 · GB/T 5231-2001
Chemical composition source verified; this does not verify every standard clause, actual supply or measured heat results
- Material category
- Copper and copper alloys
- Material form
- Reference record
- Original record status
- Original standard verified
- Standard edition
- GB/T 5231-2001
- Table / clause
- Table 2 and footnotes
- PDF page references
- 1、3、4、5、6、7、8、9、10、11、12、13、14
Carbon-equivalent reference
Estimates are presented separately for each applicable composition condition. Match the actual ordering conditions; ranges must not be combined.
Table 2 standard condition
Note 2, special applications: specified impurity limits and total ≤0.20%
Table 2, Note 1: Fe ≤0.030% for non-magnetic brass; do not automatically combine with other purchasing conditions
Composition record (conditional branches apply; this is not an unconditional requirement)
| Element | Composition requirement |
|---|---|
| Cu | 68.5 ～ 71.5 |
| Fe | ≤ 0.1 (lower limit not stated) |
| Pb | ≤ 0.03 (lower limit not stated) |
| Ni | ≤ 0.5 (lower limit not stated) |
Applicability and limitations
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 ≤0.3%. Table 2, note 1: Fe≤0.030% applies to nonmagnetic brass only where nonmagnetic performance is expressly required; Ordinary conditions are not automatically tightened.
Combined limits
- Combined-element limits
- Elements requiring measured values from the same heat
- Element-sum limits
- Elements concerned
- Fe
- Pb
- Ni
- Upper limit
- 0.3
Original condition-branch records
Table 2 standard condition
| Element | Composition requirement |
|---|---|
| Cu | 68.5 ～ 71.5 |
| Fe | ≤ 0.1 (lower limit not stated) |
| Pb | ≤ 0.03 (lower limit not stated) |
| Ni | ≤ 0.5 (lower limit not stated) |
Note 2, special applications: specified impurity limits and total ≤0.20%
| Element | Composition requirement |
|---|---|
| Cu | 68.5 ～ 71.5 |
| Fe | ≤ 0.07 (lower limit not stated) |
| Pb | ≤ 0.03 (lower limit not stated) |
| Ni | ≤ 0.5 (lower limit not stated) |
| Sb | ≤ 0.002 (lower limit not stated) |
| P | ≤ 0.005 (lower limit not stated) |
| As | ≤ 0.005 (lower limit not stated) |
| S | ≤ 0.002 (lower limit not stated) |
- Combined limits
- Element-sum limits
- Elements concerned
- Fe
- Pb
- Ni
- Sb
- P
- As
- S
- Upper limit
- 0.2
Table 2, Note 1: Fe ≤0.030% for non-magnetic brass; do not automatically combine with other purchasing conditions
| Element | Composition requirement |
|---|---|
| Cu | 68.5 ～ 71.5 |
| Fe | ≤ 0.03 (lower limit not stated) |
| Pb | ≤ 0.03 (lower limit not stated) |
| Ni | ≤ 0.5 (lower limit not stated) |
A condition branch must be selected
YesVerification notes
The official GB/T 5231—2001 tables 1–4 and applicable footnotes were checked row by row against the source. The condition conflict for seven grades whose Fe content is incompatible with non-magnetic requirements is retained; it is not applied automatically.H70 · GB/T 5231-2012
Chemical composition source verified; this does not verify every standard clause, actual supply or measured heat results
- Material category
- Copper and copper alloys
- Material form
- Reference record
- Original record status
- Original standard verified
- Standard edition
- GB/T 5231-2012
- Table / clause
- Table 3, row 5, designation T26100
- PDF page references
- 7、9
Carbon-equivalent reference
Estimates are presented separately for each applicable composition condition. Match the actual ordering conditions; ranges must not be combined.
Table 3, ordinary condition, total impurities ≤0.30%
Table 3, note b, special applications: specified impurity limits and total impurities ≤0.20%
Composition record (conditional branches apply; this is not an unconditional requirement)
| Element | Composition requirement |
|---|---|
| Cu | 68.5 ～ 71.5 |
| Fe | ≤ 0.1 (lower limit not stated) |
| Pb | ≤ 0.03 (lower limit not stated) |
Applicability and limitations
Mass fraction wt%; GB/T5231—2012, Table 3, row 5, designation T26100. Zn is the balance; The listed total impurities ≤0.3%, covering all impurities other than the main components; the partial sum of listed elements cannot replace the total impurity analysis. Clause 2.2: single values for other impurity elements are maxima; Unlisted limits shall be negotiated between the supplier and the purchaser and cannot be filled as zero. This standard covers wrought copper and copper-alloy designations and chemical composition; actual supply of cold-heading wire is not inferred. Table 3 Note b: Special application H70/H80 has separate limit values Fe≤0.07%, Sb≤0.002%, P≤0.005%, As≤0.005%, S≤0.002%, with total impurities ≤0.20%; Application conditions must be specified.
Combined limits
- Combined-element limits
- Elements requiring measured values from the same heat
Original condition-branch records
Table 3, ordinary condition, total impurities ≤0.30%
| Element | Composition requirement |
|---|---|
| Cu | 68.5 ～ 71.5 |
| Fe | ≤ 0.1 (lower limit not stated) |
| Pb | ≤ 0.03 (lower limit not stated) |
Table 3, note b, special applications: specified impurity limits and total impurities ≤0.20%
| Element | Composition requirement |
|---|---|
| Cu | 68.5 ～ 71.5 |
| Fe | ≤ 0.07 (lower limit not stated) |
| Pb | ≤ 0.03 (lower limit not stated) |
| Sb | ≤ 0.002 (lower limit not stated) |
| P | ≤ 0.005 (lower limit not stated) |
| As | ≤ 0.005 (lower limit not stated) |
| S | ≤ 0.002 (lower limit not stated) |
- Total impurity upper limit
- 0.2