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OkeyProbably the most popular of the martensitic stainless steels, it has a higher carbon content than the previous type, and combines good corrosion resistance, good deformability at the annealed state and good temperability. Used for pump shafts, electric motor shafts, tools and cutlery.
| EUROPE | ITALY | GERMANY | FRANCE | UK | USA | ||
|---|---|---|---|---|---|---|---|
|
EN 10088-3: 2005 |
(UNI 6900: 71) |
(DIN 17440 - 85) |
(NF A 35-574-90) |
(BS 1554 - 90) |
AISI | ||
| Grade | N° | Werkstoff | N° | ||||
| X30Cr13 | 1.4028 | X30Cr13 | X30Cr13 | 1.4028 | Z33C13 | 420S45 | 420 |
| C | Si / max | Mn / max | P / max | S /max | Cr |
|---|---|---|---|---|---|
| 0,26÷0,35 | 1,00 | 1,50 | 0,040 | 0,030 | 12,0÷14,0 |
| Size(mm) | Heat treatment | Hardness HB max* | Rp 0,2 (MPa) min | Rm (MPa) | A5 (%) min | KV (J) min |
|---|---|---|---|---|---|---|
| d≤100 | Annealed (+A) | 245 | - | 800 max | - | - |
| Quenched + Tempered (+QT 850) | - | 650 | 850÷1000 | 10 | 12 |
* 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 850) | 700 | 900÷1150*** | 7 | - |
| 10<d≤16 | 950 | 305 | 650 | 900÷1150 | 7 | - | |
| 16<d≤40 | 900 | 280 | 650 | 850÷1100 | 9 | 15 | |
| 40<d≤63 | 840 | 260 | 650 | 850÷1050 | 9 | 15 | |
| 63<d≤100 | 800 | 245 | 650 | 850÷1000 | 10 | 15 | |
* for reference only
** values valid only for size ≥5 mm
*** On EN10088-3 value wrong (900÷1050)
| 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 (air) | 745÷825 |
| Quenching in air or oil | 950÷1050 |
| Tempering (QT 850) | 625÷675 |
