MFT12LB
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 MFT12LB →MFT12LB · GB/T 28906-2025
Chemical composition source verified; this does not verify every standard clause, actual supply or measured heat results
- Material category
- Alloy steel
- Subcategory
- Cold-heading steel not intended for quenching and tempering
- Material form
- Reference record
- Original record status
- Original standard verified
- Standard edition
- GB/T 28906-2025
- Table / clause
- Table 5 · Footnotes; 7.1.5–7.1.7
- PDF page references
- 7、11
Carbon-equivalent reference
Composition
| Element | Composition requirement |
|---|---|
| C | 0.08 ～ 0.14 |
| Si | 0.2 ～ 0.35 |
| Mn | 1.9 ～ 2.3 |
| Nb | ≤ 0.2 (lower limit not stated) |
| V | ≤ 0.1 (lower limit not stated) |
| Cr | 0.2 ～ 0.6 |
| P | ≤ 0.025 (lower limit not stated) |
| S | ≤ 0.02 (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
Mass percent, heat analysis, GB/T28906-2025 Table 5. ; 7.1.5 residual Cr/Ni/Cu are each ≤0.20% and Sn≤0.06%; tabulated alloy Cr is not subject to the residual maximum; 7.1.7 product-analysis tolerances follow GB/T222 and must not be directly treated as heat-analysis limits. ; The standard scope for hot-rolled cold-heading wire rod does not replace confirmation of actual supply dimensions and the component manufacturing process; Mechanical properties require separate verification. ; Table 5 Note a: Mo/Ti/B/Al/N and other elements may be added by agreement between both parties according to strength and product-size requirements, with the agreement stated in the contract; do not fill in values where no uniform range is given. ; B at the end of MFT grades indicates a ferrite + bainite structure and does not represent a specified boron content; Do not enter 0 if B is not specified.