DT4A
1 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 DT4A →DT4A · GB/T 6983-2022
Original-source verification is incomplete; this is not a formal standard reference
- Material category
- Other metallic materials
- Material form
- Electromagnetic pure iron (source classification)
- Verification status
- Original standard verified
- Standard edition
- GB/T 6983-2022
- Table / clause
- Main text: Table 2, row 2; Informative Annex A · Table A.1
- PDF page references
- 6、10
- Unit
- Mass fraction (%)
- Analysis type
- Informative-annex reference
Carbon-equivalent reference
Composition
| Element | Composition requirement |
|---|---|
| C | ≤ 0.006 (lower limit not stated) |
| Si | ≤ 0.08 (lower limit not stated) |
| Mn | ≤ 0.25 (lower limit not stated) |
| P | ≤ 0.012 (lower limit not stated) |
| S | ≤ 0.006 (lower limit not stated) |
| Al | ≤ 0.8 (lower limit not stated) |
| Ti | ≤ 0.005 (lower limit not stated) |
| Cr | ≤ 0.03 (lower limit not stated) |
| Ni | ≤ 0.02 (lower limit not stated) |
| Cu | ≤ 0.02 (lower limit not stated) |
Applicability and limitations
GB/T 6983—2022, main-text Table 2, row 2: DT4A is the high electromagnetic-performance class; For specimens annealed as specified: coercivity Hc≤60 A/m, aging increment ≤6 A/m, and maximum permeability ≥0.0100 H/m; Minimum B200/B500/B1000/B2500/B5000/B10000 magnetic flux densities (T) are, in order, 1.20, 1.40, 1.50, 1.62, 1.71 and 1.80. These electromagnetic properties apply under the specified specimen treatment and test conditions and are not guarantees for arbitrary delivery conditions. Main-text 7.1 requires chemical analysis to be provided but does not use it as a delivery-acceptance criterion; Chemical composition is transcribed only from the common reference values in informative Annex A, Table A.1; these are not independent mandatory composition limits for the four grades. Product dimensions and form must be confirmed under main-text Table 1 and the order contract.