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This steel has the highest amount of carbon in this category, and is used in the automobile industry to obtain shafts and pins with high surface hardness to resist wear and sliding.
| EUROPE | ITALY | GERMANY | FRANCE | UK | USA | ||
|---|---|---|---|---|---|---|---|
| EU 86 - 70 | (UNI 7847 - 79) FIAT 52501 |
(DIN 17212-72) | (NF A 35-563-83) | (BS 970 pt.3-96) | ASTM A 29 | ||
| Grade | N° | Werkstoff | N° | ||||
| C53 | - | C53 | CF53 | 1.1213 | (XC55TS) | (070M55) | (1055) |
| ITALY | C | Si | Mn | P/max | S | Cr/max | Mo/max | Ni/max | Cu/max | Al |
|---|---|---|---|---|---|---|---|---|---|---|
| C53 | 0,52÷0,57 | 0,15÷0,35 | 0,60÷0,80 | 0,035 | 0,020÷0,035 | 0,20 | 0,20 | 0,25 | 0,30 | 0,020÷0,050 |
| Delivering condition | Size (mm) | |||||||
|---|---|---|---|---|---|---|---|---|
| Rp0,2 (MPa) min | Rm (MPa) min | A5 (%) min | HB core | HB surface | ||||
| SOFT ANNEALED | all | - | - | - | - | ≤235 | ||
| SPHERODIZING | all | - | - | - | - | ≤210 | ||
| NORMALIZED | 16<d≤100 | 340 | 640÷790 | 16 | - | 180÷232 | ||
| QUENCHED AND TEMPERED | d≤16 | 520 | 760÷910 | 12 | 220÷260 | 220÷264 | ||
| 16<d≤40 | 470 | 710÷850 | 14 | 207÷248 | ||||
| 40<d≤100 | 420 | 640÷780 | 15 | 190÷229 | ||||
| Size (mm) |
as Rolled + as Rolled + Turned (+SH) | Quenched + Tempered + Turned (+QT +SH)*** | Quenched + Tempered + Cold Drawn (+QT +C) | Cold Drawn (+C) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Hardness HB | Rm (MPa) | Rp0,2 (MPa) min | Rm (MPa) min | A5 (%) min | Rp0,2 (MPa) min | Rm (MPa) | A5 (%) min | Rp0,2 (MPa) min |
Rm (MPa) | A5 (%) min | ||
| 5≤d≤10 | - | - | - | - | - | 670 | 885÷1085 | 6 | 610 | 785÷1120 | 5 | |
| 10<d≤16 | - | - | - | - | - | 640 | 850÷1060 | 6 | 535 | 750÷1100 | 5 | |
| 16<d≤40 | 189÷274 | 640÷920 | 490 | 750÷900 | 14 | 610 | 795÷1010 | 7 | 460 | 710÷1075 | 6 | |
| 40<d≤63 | 189÷274 | 640÷920 | 420 | 700÷850 | 15 | 550 | 740÷960 | 8 | 425 | 695÷1060 | 7 | |
| 63<d≤100 | 189÷274 | 640÷920 | 420 | 700÷850 | 15 | 475 | 715÷900 | 8 | - | - | - | |
*For reference only
**For size <5 mm the mechanical properties may be agreed at the time of enquiry and order***
This values are valid also for Cold drawn + Quenched + Tempered condition (+C +QT)
| Operation | °C |
|---|---|
| Hot forgings deformation | 850÷1100 |
| Normalizing | 825÷865 |
| Soft annealing | 650÷700 |
| Quenching in oil | 805÷845 |
| Tempering | 550÷650 |
