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Martensitic steel with low temperability. The addition of sulfur makes this type widely used for mechanical machining with chip removal, also without the quenching and tempering treatment. The resistance to corrosion is limited due to the presence of sulfur, but is better in any case with respect to the 416 type thanks to the addition of molybdenum.
| 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° | ||||
| X14CrMoS17 | 1.4104 | X10CrS17 | X14CrMoS17 | 1.4104 | Z44C14 | Z13CF17 | 430F |
| C | Si / max | Mn / max | P / max | S | Mo |
|---|---|---|---|---|---|
| 0,10÷0,17 | 1,00 | 1,50 | 0,040 | 15,5÷17,5 | 0,20÷0,60 |
| Size (mm) | Heat treatment | Hardness HB max* | Rp 0,2 (MPa) min | Rm (MPa) | A5 (%) min |
|---|---|---|---|---|---|
| d≤100 | Annealed (+A) | 220 | - | 730 max | - |
| d≤60 | Quenched + Tempered (+QT 650) | - | 500 | 650÷850 | 12 |
| 60<d≤100 | Quenched + Tempered (+QT 650) | - | 500 | 650÷850 | 10 |
* 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 | 950 | 305 | Quenched + Tempered (+QT 650) |
700 | 900÷1150 | 7 | - |
| 10<d≤16 | 950 | 305 | 700 | 900÷1150 | 7 | - | |
| 16<d≤40 | 900 | 280 | 650 | 850÷1100 | 8 | 12 | |
| 40<d≤63 | 840 | 260 | 650 | 850÷1000 | 8 | 12 | |
| 63<d≤100 | 800 | 245 | 650 | 850÷1000 | 10 | 12 | |
* 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 | 900÷1100 |
| Annealing (furnace, air) | 750÷850 |
| Quenching in air or oil | 950÷1050 |
| Tempering (QT 650) | 650÷700 |