Steel similar to X39Cr13 (420C) but with the addition of molybdenum, which increases its resistance to corrosion at high temperature.
Standard Reference: EN 10088-3: 2014 (Hot-rolled and bright products)
| EUROPE | ITALY | GERMANY | FRANCE | UK | USA | ||
|---|---|---|---|---|---|---|---|
|
EN 10088-3: 2005 |
(UNI 6900: 71) |
(DIN 17440 - 85) |
(NF A 35-574-90) |
(BS 970 pt. 3-91) | AISI | ||
| Grade | N° | Werkstoff | N° | ||||
| X39CrMo17-1 | 1.4122 | - | - | - | - | - | - |
| C | Si / max | Mn / max | P / max | S / max | Cr | Mo | Ni / max |
|---|---|---|---|---|---|---|---|
| 0,33÷0,45 | 1,00 | 1,50 | 0,040 | 0,030 | 15,5÷17,5 | 0,80÷1,30 | 1,00 |
| Size (mm) | Heat treatment | Hardness HB max* | Rp 0,2 (MPa) min | Rm (MPa) | A5 (%) min |
|---|---|---|---|---|---|
| d≤100 | Annealed (+A) | 280 | - | 900 max | - |
| d≤60 | Quenched + Tempered (+QT 750) | - | 550 | 750÷950 | 15 |
* only for guidance
| Size (mm) | Annealed | Quenched + Tempered | |||||
|---|---|---|---|---|---|---|---|
| Rm (MPa) max | HB max* | Heat treatment | Rp 0,2 (MPa) min | Rm (MPa) max | A5 (%) min** | KV (J) min | |
| d≤10 | 1000 | 340 | Quenched + Tempered (+QT750) | 650 | 800÷1050 | 8 | - |
| 10<d≤16 | 1000 | 340 | 600 | 800÷1050 | 8 | - | |
| 16<d≤40 | 980 | 310 | 550 | 750÷1000 | 10 | 14 | |
| 40<d≤63 | 930 | 290 | 550 | 750÷950 | 12 | 14 | |
| 63<d≤100 | 900 | 280 | 550 | 750÷950 | 12 | 10 | |
* for reference only
** values valid only for size ≥5 mm
| Tensile strength levels | Rm (MPa) |
|---|---|
| +C 500 | 500÷700 |
| +C 650 | 650÷850 |
| +C 800 | 800÷1000 |
| +C 900 | 900÷1100 |
Note: the desired tensile strength level shall be evaluated depending on diameter required
| Size | A (%) max | Rm (MPa) max |
|---|---|---|
| 0,50≤d≤1,00 | 10 | 1100 |
| 1,00≤d≤3,00 | 10 | 1050 |
| 3,00≤d≤5,00 | 10 | 1000 |
| 5,00≤d≤16,00 | 15 | 950 |
Note: If skin passed, Rm might be increased by up to 50 MPa
| Operation | °C |
|---|---|
| Hot forgings deformation | 800÷1100 |
| Annealing (furnace, air) | 750÷850 |
| Quenching in oil | 980÷1060 |
| Tempering (QT 750) | 650÷750 |
