SWRCH35K-B
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SWRCH35K-B · Q/BQB 517-2023
Chemical composition source verified; this does not verify every standard clause, actual supply or measured heat results
- Material category
- Cold-heading steel
- Subcategory
- Cold-heading steel
- Original record status
- Original standard verified
- Standard edition
- Q/BQB 517—2023
- Table / clause
- 6.1.1/Table 1, row 63, note a
- PDF page references
- 11
- Unit
- Mass fraction (wt%)
- Analysis type
- Heat analysis
Original composition-element notation and analysis basis
- Al
- Original element symbol
- Alₜ
- Symbol extracted from the original source
- Alt
- Original table column heading
- Al t
- Subscript in the original source
- t
- Subscript explanation
- Only original table subscripts shall be retained; do not expand these into total aluminum or acid-soluble aluminum; Al without specified form shall not be directly equated
- Standard edition
- Q/BQB 517—2023
- Table / clause
- 1
- Original table item number
- 63
- PDF page references
- 11
- Unit
- Mass fraction (wt%)
- Analysis type
- Heat analysis
- Original record status
- Original column symbol verified
- Original cell
- 0.015～ 0.045
When the original analysis designations differ, or a record leaves them unspecified, comparability or a match cannot be concluded directly. Subscripts not explained by the source are not expanded here.
Carbon-equivalent reference
Composition
| Element | Composition requirement |
|---|---|
| C | 0.32 ～ 0.38 |
| Si | 0.1 ～ 0.35 |
| Mn | 0.6 ～ 0.9 |
| P | ≤ 0.02 (lower limit not stated) |
| S | ≤ 0.02 (lower limit not stated) |
| Cr | 0.2 ～ 0.35 |
| Mo | ≤ 0.06 (lower limit not stated) |
| B | 0.0008 ～ 0.003 |
| Alₜ | 0.015 ～ 0.045 |
| Ni | ≤ 0.2 (lower limit not stated) |
| Cu | ≤ 0.2 (lower limit not stated) |
Applicability and limitations
Q/BQB 517—2023, official original on the Baosteel website, Table 1, row 63; cast-analysis mass fraction wt%. Table footnote a: residual Cr≤0.20, Ni≤0.20, Cu≤0.20, Mo≤0.06 wt%; where this row specifies otherwise, its requirement for that element takes precedence. Unlisted elements and special agreement requirements must not be treated as zero or assumed guarantees; permitted product-analysis deviations are governed separately by GB/T 222. Wire rod is delivered hot rolled; stricter P/S under Z1 and special surface or inclusion quality must be confirmed under normative Annex A and the contractual ordering codes. Fixed mechanical properties must not be inferred from the chemistry table.