Steel used initially in the automobile industry, with a limited carbon content. Limited surface hardness after induction tempering.
Standard Reference: FIAT 52503 Specification
| EUROPE | ITALY | GERMANY | FRANCE | UK | USA | ||
|---|---|---|---|---|---|---|---|
| EU 86 - 70 | FIAT 52503 | (DIN 17212-72) | (NF A 35-563-83) | (BS 970 pt.3-96) | ASTM A 29 | ||
| Grade | N° | Werkstoff | N° | ||||
| (C36) | - | C33 | (CF35) | (1.1183) | XC32 | 060A35 | 1035 |
| ITALY | C | Si | Mn | P/max | S | Cr/max | Ni/max | Cu/max | Al |
|---|---|---|---|---|---|---|---|---|---|
| C33 | 0,30÷0,36 | 0,15÷0,40 | 0,60÷0,90 | 0,035 | 0,020÷0,035 | 0,25 | 0,25 | 0,30 | 0,020÷0,050 |
| Delivering condition | Size (mm) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Rp0,2(MPa) min |
Rm (MPa) min | A5 (%) min | KCU (J) min | KV (J) min | HB core |
HB surface | ||||
| UNTREATED | all | - | - | - | - | - | - | ≤ 240 | ||
| SOFT ANNEALED | all | 295 | 540÷690 | 19 | 25 | - | 160÷210 | 160÷210 | ||
| NORMALIZED (+N) |
10<d≤30 | 295 | 540÷690 | 19 | 25 | - | 160÷210 | 160÷210 | ||
| 30<d≤100 | 250 | 480÷650 | 21 | 25 | - | 140÷210 | 140÷210 | |||
| QUENCHED AND TEMPERED (+QT) |
16<d≤40 | 350 | 550÷700 | 20 | - | 40 | 160÷210 | 160÷210 | ||
| 40<d≤100 | 300 | 500÷650 | 21 | - | 40 | 140÷210 | 140÷210 | |||
| 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 | - | - | - | - | - | 610 | 750÷900 | 9 | 480 | 620÷950 | 6 | |
| 10<d≤16 | - | - | - | - | - | 535 | 680÷850 | 9 | 400 | 575÷900 | 7 | |
| 16<d≤40 | 147÷195 | 495÷655 | 350 | 550÷700 | 20 | 460 | 640÷800 | 10 | 300 | 560÷850 | 8 | |
| 40<d≤63 | 147÷195 | 495÷655 | 300 | 500÷650 | 21 | 390 | 550÷690 | 11 | 275 | 525÷800 | 9 | |
| 63<d≤100 | 147÷195 | 495÷655 | 300 | 500÷650 | 21 | 310 | 500÷650 | 12 | 240 | 470÷780 | 9 | |
| *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 | 870÷910 |
| Soft annealing | 650÷700 |
| Quenching in water | 840÷860 |
| Tempering | 550÷650 |
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