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A steel widely used in Italy, it is in any case included in the European standards. The addition of nickel in addition to chromium-molybdenum improves the performance of the pieces obtained, especially with regard to resistance to fatigue and vibrations.
| EUROPE | ITALY | GERMANY | FRANCE | UK | USA | ||
|---|---|---|---|---|---|---|---|
|
EN 10083-3: 2006 |
(UNI 7845-78) | (DIN 17200-86) | (NF A 35-552-86) | (BS 970 pt.3-96) | ASTM A 29 | ||
| Grade | N° | Werkstoff | N° | ||||
| 39NiCrMo3 | 1.6510 | 39NiCrMo3 | - | - | - | 817M40 | - |
| EUROPE | C | Si | Mn | P/max | S | Cr | Mo | Ni | Cu/max | Al | Pb |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 39NiCrMo3 | 0,35÷0,43 | 0,15÷0,40 | 0,50÷0,80 | 0,025 | 0,020÷0,035 | 0,60÷1,00 | 0,15÷0,25 | 0,70÷1,00 | 0,40 | 0,020÷0,050 | - |
| 39NiCrMo3Pb | 0,15÷0,30 |
| Size (mm) |
Treated to improve shearability (+S) |
Soft annealing (+A) |
Quenched and tempered (+QT) | |||
|---|---|---|---|---|---|---|
| HB max to condition | Rp0,2 (MPa) min | Rm (MPa) min | A5 (%) min | KV (J) min | ||
| d≤16 | where the shearability is of importance, this steel should be ordered in the “soft annealed” condition | 240 | 785 | 980÷1180 | 11 | - |
| 16<d≤40 | 240 | 735 | 930÷1130 | 11 | 30 | |
| 40<d≤100 | 240 | 685 | 880÷1080 | 12 | 30 | |
| 100<d≤160 | 240 | 635 | 830÷980 | 12 | 30 | |
| 160<d≤250 | 240 | 540 | 740÷880 | 13 | 30 | |
| Size (mm) |
as Rolled+Turned (+A+SH) | Quenched+Tempered+Turned (+QT+SH)* | Quenched+Tempered+Cold Drawn (+QT+C) | as Rolled+Cold Drawn(+A+C) | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Hardness HB max | Rp0,2 (MPa) min | Rm (MPa) min | A5 (%) min | Rp0,2 (MPa) min | Rm (MPa) | A5 (%) min | Hardness HB max | ||||
| 5≤d≤10 | - | - | - | - | 735 | 980÷1180 | 8 | 295 | |||
| 10<d≤16 | - | - | - | - | 700 | 930÷1130 | 8 | 290 | |||
| 16<d≤40 | 240 | 735 | 930÷1130 | 11 | 700 | 930÷1130 | 9 | 285 | |||
| 40<d≤63 | 240 | 735 | 880÷1080 | 12 | 625 | 880÷1080 | 10 | 280 | |||
| 63<d≤100 | 240 | 735 | 880÷1080 | 12 | 600 | 880÷1080 | 10 | 280 | |||
*This values are valid also for Cold Drawn - Quenched + Tempered Condition (+C +QT)
For size <5 mm the mechanical properties may be agreed at the time of enquiry and order
| Operation | °C |
|---|---|
| Hot forgings deformation | 850÷1150 |
| Isothermal annealing | 830÷860-->650 |
| Soft annealing | 640÷680 |
| Quenching in oil | 830÷850 |
| Tempering | 550÷650 |
| 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 | 45 | 50 | |||||||
| +H | Max | 60 | 60 | 59 | 58 | 58 | 57 | 57 | 56 | 55 | 52 | 51 | 49 | 48 | 46 | 45 | |||||
| Min | 52 | 51 | 50 | 49 | 48 | 46 | 44 | 43 | 39 | 36 | 34 | 33 | 32 | 31 | 30 | ||||||
