Q275B
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 Q275B →Q275B · GB/T 700-2006
Chemical composition source verified; this does not verify every standard clause, actual supply or measured heat results
- Material category
- Carbon steel
- Material form
- Carbon structural steel (source classification)
- Original record status
- Original standard verified
- Standard edition
- GB/T 700-2006
- Table / clause
- Main text: Table 1, row 9; Clause 5.1.1
- PDF page references
- 4、5
- Unit
- Mass fraction (%)
- Analysis type
- Ladle analysis
Carbon-equivalent reference
Composition
| Element | Composition requirement |
|---|---|
| C | ≤ 0.21 (lower limit not stated) |
| Si | ≤ 0.35 (lower limit not stated) |
| Mn | ≤ 1.5 (lower limit not stated) |
| P | ≤ 0.045 (lower limit not stated) |
| S | ≤ 0.045 (lower limit not stated) |
| Cr | ≤ 0.3 (lower limit not stated) |
| Ni | ≤ 0.3 (lower limit not stated) |
| Cu | ≤ 0.3 (lower limit not stated) |
| N | ≤ 0.008 (lower limit not stated) |
| As | ≤ 0.08 (lower limit not stated) |
Applicability and limitations
GB/T 700—2006, main-text Table 1, row 9, unified numerical designation U12755; Heat-analysis mass percentages; this record uses the default limits in Table 1. 5.1.1.2：Cr/Ni/Cu≤0.30%、N≤0.008%; 5.1.1.3：As≤0.080%. The N/P coupling for 5.1.1.2.1, the agreed Cu maximum 0.35% for 5.1.1.2.2 A quality, and the absence of a C/Mn/Si assessment for 5.1.1.4 under the applicable delivery condition must not be applied to default values. Mechanical values in Tables 2 and 3 depend on product thickness, specimen and delivery condition; existing reference properties are not upgraded to general guarantees by this composition verification. Table 1: C≤0.21% in this row applies only to thickness/diameter ≤40mm; At >40mm, C≤0.22% applies; assess separately by size.