Steel with a limited addition of chromium and boron, which provide greater temperability with respect to similar steels with carbon only (C45). It is not unified in any standard, but is used in the automobile industry and in other fields.
| EUROPE | ITALY | GERMANY | FRANCE | UK | USA | ||
|---|---|---|---|---|---|---|---|
| EN 10083-3: 2006 | (UNI 7845-78) | (DIN 17200-86) | (NF A 35-552-86) | (BS 970 pt.3-96) | ASTM A 29 | ||
| Kalite | N° | Werkstoff | N° | ||||
| - | - | - | - | - | - | - | - |
| C | Si | Mn | P/max | S | Cr | B | Ni/max |
|---|---|---|---|---|---|---|---|
| 0,42÷0,50 | 0,15÷0,40 | 0,60÷0,90 | 0,035 | 0,020÷0,040 | 0,30÷0,60 | 0,0010÷0,0050 | 0,30 |
| Size (mm) |
Soft annealing (+A) |
Quenched and tempered (+QT) |
||||
|---|---|---|---|---|---|---|
| HB max to condition | Rp0,2 (MPa) min |
Rm (MPa) min |
A5 (%) min |
Z (%) min |
KV (J) min |
|
| d≤16 | 223 | 650 | 900÷1100 | 12 | 35 | - |
| 16<d≤40 | 223 | 550 | 800÷950 | 14 | 40 | 35 |
| 40<d≤100 | 223 | 400 | 650÷800 | 15 | 45 | 35 |
| 100<d≤160 | 223 | - | - | - | - | - |
| 160<d≤250 | 223 | - | - | - | - | - |
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