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Steel that originated in the automobile industry, no longer present in the international standards. Thanks to its high nickel content, it is used for pieces that are particularly subject to fatigue and vibrations.
| EUROPE | ITALY | GERMANY | FRANCE | UK | USA | ||
|---|---|---|---|---|---|---|---|
| EN 10084: 2008 EN 10277-4: 2008 |
(UNI 7846-78) | (DIN 17210-84) | (NFA35-551-86) | (BS970 pt.1--96) | ASTM A 29 | ||
| Grade | N° | Werkstoff | N° | ||||
| (15NiCr13) | (1.5752) | 16NiCr11 | - | - | 14NC11 | - | - |
| C | Si | Mn | P/max | S | Cr | Mo/max | Ni | Al |
|---|---|---|---|---|---|---|---|---|
| 0,12÷0,18 | 0,15÷0,40 | 0,30÷0,60 | 0,025 | 0,020÷0,035 | 0,60÷0,90 | 0,10 | 2,50÷3,00 | 0,020÷0,050 |
| Hardness (HB) - Treated to improve sherability (+S) | Hardness (HB) - Annealed to maximum hardness requirements (+A) | Hardness (HB) - Treated to ferrite-pearlite structure and hardness range (+FP) | |||
|---|---|---|---|---|---|
| ≤ 280 | ≤ 235 | ≥ 150 | ≤ 210 | ||
| Size (mm) |
+A**+ Turned (+A +SH) | +A**+ Cold drawn (+A+C) | FP***+ Turned (+FP +SH) | FP***+ Cold drawn (+FP +C) | |||
|---|---|---|---|---|---|---|---|
| Hardness HB max | Hardness HB max | Hardness HB | Hardness HB | ||||
| 5≤d≤10 | - | - | - | - | |||
| 10<d≤16 | - | 255 | - | 150÷220 | |||
| 16<d≤40 | 235 | 255 | 150÷210 | 150÷220 | |||
| 40<d≤63 | 235 | 255 | 150÷210 | 145÷215 | |||
| 63<d≤100 | 235 | 255 | 150÷210 | 145÷215 | |||
*for reference only
**+A = annealed to maximum hardness requirement
***+FP = treated to ferrite-perlite structure and hardness range
For size <5 mm the mechanical properties may be agreed at the time of enquiry and order
| Operation | °C |
|---|---|
| Hot forgings deformation | 900÷1150 |
| Carburizing temperature | 880÷980 |
| Core quenching temperature | 840÷880 |
| Case quenching temperature | 780÷820 |
| Tempering | 150÷200 |
| Limits of range | Hardness HRC at a distance from quenched end of test pieces (mm) | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1,5 | 3 | 5 | 7 | 9 | 11 | 13 | 15 | 20 | 25 | 30 | 35 | 40 | |||||||
| +H | Max | 48 | 46,5 | 44,5 | 43 | 41,5 | 40 | 39 | 37,5 | 35 | 32,5 | 31 | 29,5 | 28,5 | |||||
| Min | 39 | 36,5 | 34 | 32 | 30 | 28,5 | 27 | 26 | 23,5 | 21,5 | 19,5 | 18 | 17,5 | ||||||