1. Delivery conditions and applicable requirements
Table 1 – Delivery conditions, product forms and applicable requirements
| Delivery condition | Symbol | Wire rod | Bar | Wire |
|---|---|---|---|---|
| As hot rolled | +U | X | X | — |
| Peeled | +U+PE | X | X | — |
| Cold drawn | +U+C | — | X | X |
| Cold drawn and spheroidize annealed | +U+C+AC | — | X | X |
| Cold drawn, spheroidize annealed and lightly drawn | +U+C+AC+LC | — | X | X |
| Annealed to achieve spheroidal carbides, possibly followed by peeling | +AC or +AC+PE | X | X | — |
| Annealed to achieve spheroidal carbides and then cold drawn | +AC+C | — | X | X |
| Basis of order | Applicable requirements |
|---|---|
| Chemical composition | Table 2 and 3 |
| Mechanical properties | Table 4 |
| Supplementary or special requirements | Annex A of EN 10263-1, if agreed at the time of enquiry and order. |
X = applicable; — = not applicable. Other delivery conditions may be agreed at the time of order.
This table gives the standard combinations of product form and delivery condition. Actual supply and suitability require technical assessment.
Source: EN 10263-2:2017, Table 1, page 6 (PDF page 8).
2. Chemical composition
Table 2 – Chemical composition of steels not intended for heat treatment after cold working (cast analysis)
Reference requirements for 7MnB8, steel number 1.5519. These are not analysis results for a particular heat. The order standard and requirements for raw material and finished product must be confirmed separately.
| Element | Mass fraction, % |
|---|---|
| C | 0.06–0.09 |
| Si | 0.15–0.25 |
| Mn | 1.85–1.95 |
| P | ≤0.015 |
| S | ≤0.025 |
| Al | 0.02–0.04 |
Elements not listed must not be intentionally added without the purchaser’s agreement, except for finishing the heat. Appropriate precautions are required to prevent additions from scrap or other raw materials. Residual elements may be present if they do not impair mechanical properties or suitability.
Aluminium may be replaced by one or more elements with a similar effect.
For 1.5519, the following additions are permitted: Cr ≤0.2%, Mo ≤0.05%, Ni ≤0.25%, V 0.03–0.05%, Ti 0.06–0.1% and B 0.0015–0.0030%.
The 2017 standard states that a particular application is patented; this is not an assessment of current patent status.
Table 3 gives manganese deviations only up to and including 1.80%. It gives no separate deviation for the manganese range 1.85–1.95%; no such deviation has been inferred here.
Table 3 – Permissible deviations for product analysis
| Element | Limiting values for cast analysis, % | Permissible deviation for product analysis, % |
|---|---|---|
| C | ≤0.22 | ±0.02 |
| Si | ≤1.00 | +0.03 |
| Si | >1.00 | ±0.05 |
| Mn | ≤1.00 | ±0.04 |
| Mn | >1.00 and ≤1.80 | ±0.05 |
| P | ≤0.025 | +0.005 |
| S | ≤0.025 | +0.005 |
| Al | ≤0.060 | ±0.005 |
± means that, within one heat, the product analysis for a given element may deviate above the upper limit or below the lower limit in Table 2, but not both at the same time.
Source: EN 10263-2:2017, Table 2 on page 7 (PDF page 9), and Table 3 on page 8 (PDF page 10). These tables do not replace the complete standard.
3. Mechanical properties
Table 4 – Mechanical properties of steels not intended for heat treatment after cold working, in the specified delivery condition
| Steel name | Steel number | Diameter | Delivery condition | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| +U or +U+PE | +AC or +AC+PE | +U+C | +U+C+AC | +U+C+AC+LC | +AC+C | ||||||||||
| over, mm | up to and including, mm | Rm max., MPa | Z min., % | Rm max., MPa | Z min., % | Rm max., MPa | Z min., % | Rm max., MPa | Z min., % | Rm max., MPa | Z min., % | Rm max., MPa | Z min., % | ||
| 7MnB8 | 1.5519 | 5 | 10 | 650 b | 60 | — | — | 800 b | — | — | — | — | — | — | — |
| 7MnB8 | 1.5519 | 10 | 25 | 600 b | 55 | — | — | 800 b | — | — | — | — | — | — | — |
| 7MnB8 | 1.5519 | 25 | 40 | 600 b | 55 | — | — | 800 b | — | — | — | — | — | — | — |
Note a: Z values for +U or +U+PE are given for information only.
Note b: The marked Rm values for 8MnSi7 and 7MnB8 are minimum values, although the column heading specifies maximum.
Note c: The standard states that a particular application of 7MnB8 is patented. This is a statement in the 2017 source, not an assessment of current patent status.
Source: EN 10263-2:2017, Table 4, page 10. Rm is tensile strength; Z is reduction of area at fracture. The values apply to the specified diameter intervals and delivery conditions. A dash does not mean zero or confirm availability.