This type is widely used in Germany instead of C45 and, thanks to the higher carbon, allows high surface hardness to be obtained.
Standard Reference: UNI 7847 - 79 (Hot-rolled)
| EUROPE | ITALY | GERMANY | FRANCE | UK | USA | ||
|---|---|---|---|---|---|---|---|
| EU 86 - 70 | (UNI 7847 - 79) (UNI 10233 - 3: 93) |
(DIN 17212-72) | (NF A 35-563-83) | (BS 970 pt.3-96) | ASTM A 29 | ||
| Grade | N° | Werkstoff | N° | ||||
| (C46) | - | C48 | (CF 45) | (1.1193) | XC48TS | - | 1049 |
| ITALY | C | Si | Mn | P/max | S | Cr/max | Mo/max | Ni/max | Al |
|---|---|---|---|---|---|---|---|---|---|
| C48 | 0,45÷0,52 | 0,15÷0,40 | 0,50÷0,80 | 0,030 | 0,020÷0,035 | 0,40 | 0,10 | 0,40 | 0,020÷0,050 |
| Delivering condition | Size (mm) |
||||||||
|---|---|---|---|---|---|---|---|---|---|
| Rp0,2 (MPa) min |
Rm (MPa) min |
A5 (%) min |
KCU (J) min |
HB core |
HRC in surface after surface hardening |
||||
| SOFT ANNEALED | all | - | - | - | - | ≤238 | - | ||
| SPHERODIZING | all | - | - | - | - | ≤200 | - | ||
| ISOTHERMAL ANNEALING | all | - | - | - | - | 165÷223 | - | ||
| NORMALIZED | 16<d≤100 | 335 | 610÷760 | 16 | - | 180÷225 | ≤56 | ||
| QUENCHED AND TEMPERED | d≤16 | 510 | 730÷875 | 13 | 20 | 215÷260 | - | ||
| 16<d≤40 | 430 | 680÷830 | 14 | 15 | 200÷250 | ||||
| 40<d≤100 | 400 | 630÷770 | 15 | 15 | 185÷230 | ||||
| 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 | - | - | - | - | - | 595 | 850÷1050 | 8 | 565 | 750÷1050 | 5 | |
| 10<d≤16 | - | - | - | - | - | 565 | 810÷1010 | 8 | 500 | 710÷1030 | 6 | |
| 16<d≤40 | 172÷24 | 580÷820 | 430 | 650÷800 | 16 | 525 | 700÷900 | 9 | 410 | 650÷1000 | 7 | |
| 40<d≤63 | 172÷24 | 580÷820 | 370 | 630÷780 | 17 | 455 | 650÷850 | 10 | 360 | 630÷900 | 8 | |
| 63<d≤100 | 172÷24 | 580÷820 | 370 | 630÷780 | 17 | 455 | 650÷850 | 11 | 310 | 580÷850 | 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÷1150 |
| Normalizing | 850÷890 |
| Soft annealing | 650÷700 |
| Quenching in oil | 830÷870 |
| Tempering | 550÷660 |
