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The particular chemical composition of this steel, with high chromium and nickel levels, allows it to resist elevated temperatures in an excellent way, for example in pieces exposed to the heat of heat treatment ovens.
| EUROPE | ITALY | GERMANY | FRANCE | UK | USA | ||
|---|---|---|---|---|---|---|---|
| EN 10095: 1999 |
(UNI 6900:71) |
- | (NF A 35-578-91) | (BS 1501 pt. 3-80) | AISI | ||
| Grade | N° | Werkstoff | N° | ||||
| X8CrNi25-21 | 1.4845 | X 22 CrNi 25 20 | - | - | Z 8 CN 25 - 20 | 310S16 | 310 S |
| C / max | Si / max | Mn / max | P / max | S / max | N/ max | Cr | Ni |
|---|---|---|---|---|---|---|---|
| 0,10 | 1,50 | 2,00 | 0,045 | 0,015 | 0,11 | 24,0÷26,0 | 19,0÷22,0 |
| Size (mm) | Hardness HB max* ** | Rp 0,2 (MPa) min** *** | Rp 1,0 (MPa) min** *** | Rm (MPa) | A5 (%) min*** |
|---|---|---|---|---|---|
| d≤100 | 192 | 175 | 210 | 500÷700 | 45 |
*only for guidance
**for rods, only the tensile strength values apply
*** the maximum HB values may be raised by 100HB or the tensile strenght value may be raised by 200 MPa and the minimum A% value may be lowered to 20% for bars of ≤35 mm
| Tensile strength levels | Rm (MPa) |
|---|---|
| +C 600 | 600÷800 |
| +C 700 | 700÷900 |
| +C 800 | 800÷1000 |
| +C 900 | 900÷1100 |
| +C 1000 | 1000÷1250 |
| +C 1100 | 1100÷1350 |
| +C 1200 | 1200÷1450 |
| +C 1400 | 1400÷1700 |
| +C 1600 | 1600÷1900 |
*for reference only
Note: the desired tensile strength level shall be evaluated depending on diameter required
| Size | A (%) max | Rm (MPa) max |
|---|---|---|
| 0,10≤d≤0,20 | 20 | 1050 |
| 0,20≤d≤0,50 | 30 | 1000 |
| 0,50≤d≤1,00 | 30 | 950 |
| 1,00≤d≤3,00 | 30 | 900 |
| 3,00≤d≤5,00 | 35 | 850 |
| 5,00≤d≤16,00 | 35 | 800 |
*for reference only
Note: If skin passed, Rm might be increased by up to 50 MPa
| Size (mm) |
As Treated (+AT) or Peeled (+AT+PE) | Cold Drawn (+AT +C) | Cold Drawn + Solution annealed (+AT +C +AT) | Cold Drawn + Solution annealed + Skin passed (+AT +C +AT +LC) | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Rm (MPa) max | Z (%) min | Rm (MPa) max | Z (%) min | Rm (MPa) max | Z (%) min | Rm (MPa) max | Z (%) min | ||||
| 2≤d≤5 | - | - | - | - | 670 | 68 | 720 | 63 | |||
| 5<d≤10 | 650 | 68 | 780 | - | 650 | 68 | 700 | 63 | |||
| 10<d≤25 | 650 | 68 | 750 | - | 650 | 68 | - | - | |||
| 25<d≤50 | 650 | 68 | - | - | - | - | - | - | |||
*for reference only
| Operation | °C |
|---|---|
| Hot forgings deformation | 950÷1200 |
| Solution annealing (water, air) | 1050÷1150 |
