SPHT2
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 SPHT2 →SPHT2 · Q/BQB 130-2003
Chemical composition source verified; this does not verify every standard clause, actual supply or measured heat results
- Material category
- Carbon steel
- Subcategory
- Slab steels
- Material form
- Rough-rolled slabs for rerolling
- Original record status
- Original standard verified
- Standard edition
- Q/BQB 130—2003
- Table / clause
- 4.1.1, Table 3 and notes 1–3
- PDF page references
- 3、4
- Unit
- Mass fraction (wt%)
- Analysis type
- Heat analysis
Carbon-equivalent reference
Estimates are presented separately for each applicable composition condition. Match the actual ordering conditions; ranges must not be combined.
A deoxidation method; applicable finished plate thickness 1.2–6 mm; Al is total aluminium Al_t
C capped steel (Table 3, note 2 a)); Applies to finished plate thickness 1.2–6 mm; Al is total aluminum Al_t; No requirement is specified for Al
Composition record (conditional branches apply; this is not an unconditional requirement)
| Element | Composition requirement |
|---|---|
| C | ≤ 0.13 (lower limit not stated) |
| Si | ≤ 0.05 (lower limit not stated) |
| Mn | 0.2 ～ 0.65 |
| P | ≤ 0.035 (lower limit not stated) |
| S | ≤ 0.035 (lower limit not stated) |
| Al | ≥ 0.01 (upper limit not stated) |
Applicability and limitations
Q/BQB 130—2003 is the standard for primary rolled slabs for re-rolling; The finished plate thickness in Table 3 refers to the thickness after the slab is re-rolled, not the slab thickness or wire diameter. Table 3 specifies heat analysis mass fraction wt%; C: capped steel; A: aluminum-killed steel; G: aluminum-silicon-killed steel; K: silicon-killed steel.. Must be read by condition row; elements not listed shall not be regarded as zero. Note 3 of Table 3 stipulates that slabs for thick plates (finished thickness ≥ 15 mm) shall use G aluminum-silicon killed steel; Table rows involving other deoxidation methods must have their applicability verified by both the supplier and the buyer. Product-analysis tolerances for killed steel are applied separately under GB/T 222; do not mix them with the heat-analysis values in Table 3.. Table 3, Note 2 permits the marked grades to be supplied as capped steel (C).; Al is not specified under condition a), and Si≤0.05 wt% under condition b); These have been listed separately as optional conditions.
Original condition-branch records
A deoxidation method; applicable finished plate thickness 1.2–6 mm; Al is total aluminium Al_t
| Element | Composition requirement |
|---|---|
| C | ≤ 0.13 (lower limit not stated) |
| Si | ≤ 0.05 (lower limit not stated) |
| Mn | 0.2 ～ 0.65 |
| P | ≤ 0.035 (lower limit not stated) |
| S | ≤ 0.035 (lower limit not stated) |
| Al | ≥ 0.01 (upper limit not stated) |
- Combined limits
- PDF page references in the source
- 3
- Source table row number
- 28
C capped steel (Table 3, note 2 a)); Applies to finished plate thickness 1.2–6 mm; Al is total aluminum Al_t; No requirement is specified for Al
| Element | Composition requirement |
|---|---|
| C | ≤ 0.13 (lower limit not stated) |
| Si | ≤ 0.05 (lower limit not stated) |
| Mn | 0.2 ～ 0.65 |
| P | ≤ 0.035 (lower limit not stated) |
| S | ≤ 0.035 (lower limit not stated) |
- Combined limits
- PDF page references in the source
- 3
- Source table row number
- 28