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Okey
Alloy steel with chrome and molybdenum and a low carbon content; for this reason it is one of the few quenched and welded steels that can be welded (with some precautions) and it is used in gears and for small- and medium-sized pieces. The presence of molybdenum avoids the phenomenon of fragility by tempering.
| 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° | ||||
| 25CrMo4 | 1.7218 | 25CrMo4 | 25CrMo4 | 1.7218 | 25CD4 | - | - |
| 25CrMoS4 | 1.7213 | 25CrMoS4 | 1.7213 | ||||
| EUROPE | C | Si | Mn | P/max | S | Cr | Mo | Cu/max | Al | Pb |
|---|---|---|---|---|---|---|---|---|---|---|
| 25CrMo4 | 0,22÷0,29 | 0,10÷0,40 | 0,60÷0,90 | 0,025 | ≤ 0,035 | 0,90÷1,20 | 0,15÷0,30 | 0,40 | 0,020÷0,050 | - |
| 25CrMoS4 | 0,020÷0,040 | - | ||||||||
| 25CrMoS4Pb | 0,020÷0,040 | 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 | Z (%) min | KV (J) min | ||
| d≤16 | 255 | 212 | 700 | 900÷1100 | 12 | 50 | - |
| 16<d≤40 | 255 | 212 | 600 | 800÷950 | 14 | 55 | 50 |
| 40<d≤100 | 255 | 212 | 450 | 700÷850 | 15 | 60 | 50 |
| 100<d≤160 | 255 | 212 | 400 | 650÷800 | 16 | 60 | 45 |
| 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 | KV (J) min | Rp0,2 (MPa) min | Rm (MPa) | A5 (%) min | Hardness HB max | ||||
| 5≤d≤10 | - | - | - | - | - | 700 | 900÷1100 | 9 | 270 | |||
| 10<d≤16 | - | - | - | - | - | 700 | 900÷1100 | 9 | 260 | |||
| 16<d≤40 | 212 | 600 | 800÷950 | 14 | 50 | 600 | 800÷1000 | 10 | 255 | |||
| 40<d≤63 | 212 | 450 | 700÷850 | 15 | 50 | 520 | 700÷900 | 11 | 250 | |||
| 63<d≤100 | 212 | 450 | 700÷850 | 15 | 50 | 450 | 700÷900 | 12 | 250 | |||
*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 | 850÷880-->650 |
| Soft annealing | 680÷720 |
| Quenching in water or oil | 840÷870 |
| 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 | 52 | 52 | 51 | 50 | 48 | 46 | 43 | 41 | 37 | 35 | 33 | 32 | 31 | 31 | 31 | |||||
| Min | 44 | 43 | 40 | 37 | 34 | 32 | 29 | 27 | 23 | 21 | 20 | - | - | - | - | ||||||
| +HH | Max | 52 | 52 | 51 | 50 | 48 | 46 | 43 | 41 | 37 | 35 | 33 | 32 | 31 | 31 | 31 | |||||
| Min | 47 | 46 | 44 | 41 | 39 | 37 | 34 | 32 | 28 | 26 | 24 | 23 | 22 | 22 | 22 | ||||||
| +HL | Max | 49 | 49 | 47 | 46 | 43 | 41 | 38 | 36 | 32 | 30 | 29 | 28 | 27 | 27 | 27 | |||||
| Min | 44 | 43 | 40 | 37 | 34 | 32 | 29 | 27 | 23 | 21 | 20 | - | - | - | - | ||||||
