This steel is not unified in the standards. It is used when you want to obtain a mechanical resistance of circa 600 MPa, not achievable with other low-carbon free-cutting steels, while maintaining good machinability. Not suitable for heat treatments.
| Region | Standard | Grade | Werkstoff No. |
|---|---|---|---|
| Europe | EN 10087: 1998 EN 10277-3: 2008 |
- | - |
| Italy | UNI 4838-80 | - | - |
| Germany | DIN 1651-88 | - | - |
| France | NF A 35-561-92 | - | - |
| UK | BS 970 pt.3-91 | - | - |
| USA | ASTM A 29 | - | - |
StandardEN 10087: 1998
EN 10277-3: 2008
Grade-
Werkstoff No.-
StandardUNI 4838-80
Grade-
Werkstoff No.-
StandardDIN 1651-88
Grade-
Werkstoff No.-
StandardNF A 35-561-92
Grade-
Werkstoff No.-
StandardBS 970 pt.3-91
Grade-
Werkstoff No.-
StandardASTM A 29
Grade-
Werkstoff No.-
| C | Si / max | Mn | P / max | S | Pb |
|---|---|---|---|---|---|
| 0,25-0,30 | 0,30 | 1,10-1,60 | 0,10 | 0,24-0,32 | 0,15-0,30 |
| Element | Value (%) |
|---|---|
| Carbon | 0,25-0,30 |
| Silicon | 0,30 |
| Manganese | 1,10-1,60 |
| Phosphorus | 0,10 |
| Sulfur | 0,24-0,32 |
| Lead | 0,15-0,30 |
| Size (mm) | as Rolled and/or as Rolled + Turned (+SH) |
Cold Drawn (+C) |
|||
|---|---|---|---|---|---|
| Hardness HB |
Tensile Strength Rm (MPa) |
Yield Strength Rp0,2 (MPa) min |
Tensile Strength Rm (MPa) |
Elongation A5 (%) min |
|
| 5≤d≤10 | as Rolled and/or as Rolled + Turned (+SH)- | as Rolled and/or as Rolled + Turned (+SH)- | Cold Drawn (+C)440 | Cold Drawn (+C)630-890 | Cold Drawn (+C)7 |
| 10<d≤16 | as Rolled and/or as Rolled + Turned (+SH)- | as Rolled and/or as Rolled + Turned (+SH)- | Cold Drawn (+C)400 | Cold Drawn (+C)590-850 | Cold Drawn (+C)7 |
| 16<d≤40 | as Rolled and/or as Rolled + Turned (+SH)140-200 | as Rolled and/or as Rolled + Turned (+SH)450-650 | Cold Drawn (+C)350 | Cold Drawn (+C)540-820 | Cold Drawn (+C)8 |
| 40<d≤63 | as Rolled and/or as Rolled + Turned (+SH)140-200 | as Rolled and/or as Rolled + Turned (+SH)450-650 | Cold Drawn (+C)330 | Cold Drawn (+C)520-800 | Cold Drawn (+C)9 |
| 63<d≤100 | as Rolled and/or as Rolled + Turned (+SH)150-200 | as Rolled and/or as Rolled + Turned (+SH)420-620 | Cold Drawn (+C)- | Cold Drawn (+C)- | Cold Drawn (+C)- |
| Note: For size <5 mm the mechanical properties may be agreed at the time of enquiry and order. | |||||
| Operation | Temperature °C |
|---|---|
| Hot forgings deformation | 950-1250 °C |
| Normalizing | 880-910 °C |
| Soft annealing | 650-700 °C |
| Quenching in oil or water | 870-900 °C |
| Tempering | 540-680 °C |
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