Steel with more carbon than C33 steel, very popular and used especially in Italy to obtain higher surface hardness.
Standard Reference: FIAT 52504 Specification | 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° | ||||
| - | - | C43 | - | - | XC42TS | 080A42 | 1042 |
| ITALY | C | Si | Mn | P/max | S | Cr/max | Ni/max | Cu/max | Al | Pb |
|---|---|---|---|---|---|---|---|---|---|---|
| C43 | 0,40÷0,46 | 0,15÷0,40 | 0,60÷0,90 | 0,035 | 0,020÷0,035 | 0,25 | 0,25 | 0,25 | 0,020÷0,050 | - |
| C43Pb | 0,15÷0,30 |
| Delivering condition | Size (mm) |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Rp0,2(MPa) min |
Rm(MPa) min |
A5(%) min |
KCU (J) min |
KV (J) min |
HB core |
HB surface |
||||
| SOFT ANNEALED | all | - | - | - | - | - | - | ≤230 | ||
| SPHERODIZING | all | - | - | - | - | - | - | ≤200 | ||
| ISOTHERMAL ANNEALING | all | - | - | - | - | - | - | 155÷180 | ||
| NORMALIZED | d≤60 | - | - | - | - | - | - | 165÷215 | ||
| QUENCHED AND TEMPERED | d≤12 | 470 | 690÷840 | 15 | 25 | 40 | 220÷265 | 220÷265 | ||
| 12<d≤16 | 400 | 640÷790 | 16 | 20 | 212÷255 | 220÷265 | ||||
| 16<d≤40 | 360 | 570÷720 | 17 | 20 | 40 | 195÷239 | 220÷265 | |||
| Size (mm) |
as Rolled + as Rolled + Turned (+SH) |
Quenched + Tempered + Turned (+QT +SH)*** |
Quenched + Tempered + Cold Drawn (+QT +C) |
Cold Drawn (+C) |
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|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | - | - | - | - | - | 560 | 800÷1000 | 8 | 540 | 700÷1000 | 6 | |
| 10<d≤16 | - | - | - | - | - | 525 | 750÷950 | 8 | 460 | 650÷980 | 7 | |
| 16<d≤40 | 164÷207 | 550÷710 | 400 | 630÷780 | 18 | 490 | 680÷880 | 9 | 365 | 620÷920 | 8 | |
| 40<d≤63 | 164÷207 | 550÷710 | 350 | 600÷750 | 19 | 435 | 620÷820 | 10 | 330 | 590÷840 | 9 | |
| 63<d≤100 | 164÷207 | 550÷710 | 350 | 600÷750 | 19 | 420 | 600÷800 | 11 | 290 | 550÷820 | 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÷1150 |
| Normalizing | 860÷900 |
| Soft annealing | 650÷700 |
| Quenching in water | 840÷880 |
| Tempering | 550÷650 |
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