ML45MN2
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 ML45MN2 →ML45Mn2 · GB/T 28906-2025
Chemical composition source verified; this does not verify every standard clause, actual supply or measured heat results
- Material category
- Carbon steel
- Subcategory
- Cold-heading steel for quenching and tempering
- Material form
- Reference record
- Original record status
- Original standard verified
- Standard edition
- GB/T 28906-2025
- Table / clause
- Table 3 · Notes a–d; 7.1.5–7.1.7
- PDF page references
- 8、9、11
Carbon-equivalent reference
Estimates are presented separately for each applicable composition condition. Match the actual ordering conditions; ranges must not be combined.
Table 3 default composition; optional aluminum addition requires agreement
Table 3, Note a: aluminum may be added to improve cold-heading performance; total Al ≤0.060%
Composition record (conditional branches apply; this is not an unconditional requirement)
| Element | Composition requirement |
|---|---|
| C | 0.43 ～ 0.48 |
| Si | 0.1 ～ 0.3 |
| Mn | 1.4 ～ 1.8 |
| P | ≤ 0.025 (lower limit not stated) |
| S | ≤ 0.02 (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) |
| Sn | ≤ 0.06 (lower limit not stated) |
Applicability and limitations
GB/T28906-2025 Table 3: Hot-rolled wire rod of quenching-and-tempering-type cold-heading steel; heat analysis, mass fraction %.. ; Note a: Aluminum may be added to improve cold-heading performance, with Alt≤0.060%; this option does not make addition mandatory by default.. ; Note b: Through negotiation between the supplier and the buyer, Si may be lower than 0.10%; In this case, aluminum must be added and Alt≥0.020%.. This record defaults to the Si range listed in the table; do not arbitrarily fill in when no specific low-silicon agreement range is given. ; Note c: For the first 11 grades in Table 3, Cr may be added by agreement to improve hardenability and mechanical properties; the addition amount must be confirmed by both parties; When no agreement is provided, residual Cr ≤ 0.20% according to 7.1.5. ; 7.1.5 Residual Cr, Ni, and Cu are each ≤ 0.20%, and residual Sn ≤ 0.06%; The residual Cr upper limit is not applicable when Cr has a listed alloy range in the table. ; 7.1.7 Unless otherwise specified in the table, the permissible deviation of the finished product chemical composition shall be according to GB/T222; heat analysis values shall not be substituted for finished product tolerances. ; The original text applies to 5–52mm hot-rolled wire rod for cold heading; specific product specifications, supply, and processing routes still need to be confirmed; Mechanical properties to be verified separately.
Original condition-branch records
Table 3 default composition; optional aluminum addition requires agreement
| Element | Composition requirement |
|---|---|
| C | 0.43 ～ 0.48 |
| Si | 0.1 ～ 0.3 |
| Mn | 1.4 ～ 1.8 |
| P | ≤ 0.025 (lower limit not stated) |
| S | ≤ 0.02 (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) |
| Sn | ≤ 0.06 (lower limit not stated) |
Table 3, Note a: aluminum may be added to improve cold-heading performance; total Al ≤0.060%
| Element | Composition requirement |
|---|---|
| C | 0.43 ～ 0.48 |
| Si | 0.1 ～ 0.3 |
| Mn | 1.4 ～ 1.8 |
| P | ≤ 0.025 (lower limit not stated) |
| S | ≤ 0.02 (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) |
| Sn | ≤ 0.06 (lower limit not stated) |
| Al | ≤ 0.06 (lower limit not stated) |
A condition branch must be selected
YesVerification notes
Original PDF pp. 8–9, Table 3, and residual-element clause on p. 11 visually checkedML45Mn2 · 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 | 0.42 ～ 0.49 |
| Si | 0.17 ～ 0.37 |
| Mn | 1.4 ～ 1.8 |
| P | ≤ 0.02 (lower limit not stated) |
| S | ≤ 0.02 (lower limit not stated) |
| Cr | ≤ 0.3 (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 34, 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.