QSTE420TM
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 QSTE420TM →QStE420TM · 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
- 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 3–<7 mm; Al is total aluminium Al_t
A deoxidation method; applicable finished plate thickness 7–<10 mm; Al is total aluminium Al_t
Composition record (conditional branches apply; this is not an unconditional requirement)
| Element | Composition requirement |
|---|---|
| C | ≤ 0.1 (lower limit not stated) |
| Si | ≤ 0.15 (lower limit not stated) |
| Mn | 0.7 ～ 1.2 |
| P | ≤ 0.035 (lower limit not stated) |
| S | ≤ 0.03 (lower limit not stated) |
| Al | ≥ 0.01 (upper limit not stated) |
| Ti | ≤ 0.09 (lower 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.. The row-spanning entries in Table 3, Al_t≥0.01, Nb≤0.04 and Ti≤0.12 wt%, apply to the corresponding three rows.; QStE420TM thinner row and QStE500TM G row shall each follow their own cells and shall not be mixed.
Original condition-branch records
A deoxidation method; applicable finished plate thickness 3–<7 mm; Al is total aluminium Al_t
| Element | Composition requirement |
|---|---|
| C | ≤ 0.1 (lower limit not stated) |
| Si | ≤ 0.15 (lower limit not stated) |
| Mn | 0.7 ～ 1.2 |
| P | ≤ 0.035 (lower limit not stated) |
| S | ≤ 0.03 (lower limit not stated) |
| Al | ≥ 0.01 (upper limit not stated) |
| Ti | ≤ 0.09 (lower limit not stated) |
- Combined limits
- PDF page references in the source
- 4
- Source table row number
- 28
A deoxidation method; applicable finished plate thickness 7–<10 mm; Al is total aluminium Al_t
| Element | Composition requirement |
|---|---|
| C | ≤ 0.1 (lower limit not stated) |
| Si | ≤ 0.15 (lower limit not stated) |
| Mn | 0.7 ～ 1.2 |
| P | ≤ 0.035 (lower limit not stated) |
| S | ≤ 0.03 (lower limit not stated) |
| Al | ≥ 0.01 (upper limit not stated) |
| Nb | ≤ 0.04 (lower limit not stated) |
| Ti | ≤ 0.12 (lower limit not stated) |
- Combined limits
- PDF page references in the source
- 4
- Source table row number
- 29
A condition branch must be selected
YesVerification notes
Baosteel original Table 3, merged cells and notes checked row by row; select conditions by deoxidation method and finished-product thickness.QStE420TM · BEXG 021-2020
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
- Material form
- Wire rod
- Original record status
- Manufacturer source verified
- Document edition
- BEXG 021-2020, sixteenth revision stated on the cover; issued and effective on 2020-12-29; The latest original document available on this computer only
- Document title
- Technical delivery conditions for cold-heading steel wire rod for automotive parts
- Table / clause
- Table 1
- PDF page references
- 5
- Unit
- Mass fraction (wt%)
- Manufacturer
- Baoshan Iron & Steel Co., Ltd. (Baosteel)
Carbon-equivalent reference
Estimate from manufacturer-published ranges, not a standard guarantee or measured heat result; formula applicability requires review against the application and process.
Composition
| Element | Composition requirement |
|---|---|
| C | ≤ 0.12 (lower limit not stated) |
| Si | ≤ 0.5 (lower limit not stated) |
| Mn | ≤ 1.5 (lower limit not stated) |
| P | ≤ 0.03 (lower limit not stated) |
| S | ≤ 0.025 (lower limit not stated) |
| Al | ≥ 0.015 (upper limit not stated) |
| Nb | ≤ 0.09 (lower limit not stated) |
| V | ≤ 0.2 (lower limit not stated) |
| Ti | ≤ 0.15 (lower limit not stated) |
| Cr | ≤ 0.2 (lower limit not stated) |
| Ni | ≤ 0.2 (lower limit not stated) |
| Cu | ≤ 0.2 (lower limit not stated) |
| Mo | ≤ 0.06 (lower limit not stated) |
Applicability and limitations
Baosteel BEXG 021-2020, Table 1, row 20, PDF page 5; heat-analysis composition in wt%, hot-rolled wire rod. 2020 is the original edition available locally, with no claim that it is the company’s current latest edition. Special conditions and actual supply require separate confirmation.
Composition conditions
- Table 1 and its continuation give heat composition, in mass fractions wt%; The product is hot-rolled wire rod for automotive parts.
- Unless expressly stated otherwise, residual Cr≤0.20%, Ni≤0.20%, Cu≤0.20% and Mo≤0.06% apply; Specific requirements in the table and additional notes take precedence.
- A dash does not mean zero; Composition outside the table is not inferred from grade names or referenced standards.
Combined limits
- Element-sum limits
- Elements concerned
- Nb
- V
- Ti
- Upper limit
- 0.22