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OkeyPrecipitation hardening stainless steel with high corrosion resistance and also high mechanical characteristics
| 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° | ||||
| X7CrNiAI17-7 | 1.4568 | - | - | - | Z9CNA17-07 | - | 631 |
| C / max | Si / max | Mn / max | P / max | S / max | Cr | Ni | Al |
|---|---|---|---|---|---|---|---|
| 0,09 | 0,70 | 1,00 | 0,040 | 0,015 | 16,0÷18,0 | 6,5÷7,8 | 0,70÷1,50 |
| Size (mm) | Heat treatment | Hardness HB max* | Rp 0,2 (MPa) min | Rm (MPa) max | A5 (%) min | KV (J) min |
|---|---|---|---|---|---|---|
| d≤30 | Solution Annealed (+AT) | 255 | - | 850 | - | - |
* only for guidance
| 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÷1150 |
| Annealing (water, air) | 1060÷1080 |
