Products
42CrMo4 Steel - Nr.1.7225 42CrMoS4 - Nr.1.7227
High-Performance Quenched and Tempered Steel
The most widely used of the quenched and tempered steels. The excellent temperability and the absence of embrittlement fragility make this steel suitable for the production of a variety of pieces, also of medium-large size, with high mechanical characteristics.
References and Comparable Standards
Standard Reference: EN ISO 683-2: 2018 (Hot-rolled products) | EN 10277: 2018 (Bright products)
| EUROPE | ITALY | GERMANY | FRANCE | UK | USA | ||
|---|---|---|---|---|---|---|---|
|
EN 10083-2: 2006 |
(UNI 7845-78) | (DIN 17200-86) | (NF A 35-552-86) | (BS 970 pt.3-96) | ASTM A 29 | ||
| Grade | N° | Werkstoff | N° | ||||
| 42CrMo4 | 1.7225 | 42CrMo4 | 42CrMo4 | 1.7225 | 42CD4 | 708M40 | 4140 |
| 42CrMoS4 | 1.7227 | 42CrMoS4 | 1.7227 | ||||
Chemical Composition (Cast Analysis) (%)
| EUROPE | C | Si | Mn | P/max | S | Cr | Mo | Cu/max | Al | Pb |
|---|---|---|---|---|---|---|---|---|---|---|
| 42CrMo4 | 0,38÷0,45 | 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 | - |
| 42CrMoS4 | 0,020÷0,040 | - | ||||||||
| 42CrMoS4Pb | 0,020÷0,040 | 0,15÷0,30 |
Mechanical Properties - As Rolled Condition
| Size (mm) |
Treated to improve shearability (+S)* |
Soft annealing (+A) |
Quenched and tempered (+QT) |
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|---|---|---|---|---|---|---|---|
| HB max to condition | Rp0,2 (MPa) min |
Rm (MPa) min |
A5 (%) min |
Z (%) min |
KV (J) min |
||
| d≤16 | 255 | 241 | 900 | 1100÷1300 | 10 | 40 | - |
| 16<d≤40 | 255 | 241 | 750 | 1000÷1200 | 11 | 45 | 35 |
| 40<d≤100 | 255 | 241 | 650 | 900÷1100 | 12 | 50 | 35 |
| 100<d≤160 | 255 | 241 | 550 | 800÷950 | 13 | 50 | 35 |
| 160<d≤250 | 255 | 241 | 500 | 750÷900 | 14 | 55 | 35 |
| *Depending on the chemical composition of the cast and on the dimension, particularly in the case of the +HH grades, soft annealing can be necessary. | |||||||
Mechanical Properties – Bright Steel
| Size (mm) |
as Rolled+Turned (+A+SH) |
Quenched+Tempered+Turned (+QT+SH)* |
Quenched+Tempered+Cold Drawn (+QT+C) |
as Rolled+Cold Drawn (+A+C) |
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|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | - | - | - | - | - | 770 | 1000÷1200 | 8 | 300 | |||
| 10<d≤16 | - | - | - | - | - | 750 | 1000÷1200 | 8 | 290 | |||
| 16<d≤40 | 241 | 750 | 1000÷1200 | 11 | 35 | 720 | 1000÷1200 | 9 | 285 | |||
| 40<d≤63 | 241 | 650 | 900÷1100 | 12 | 35 | 650 | 900÷1100 | 10 | 280 | |||
| 63<d≤100 | 241 | 650 | 900÷1100 | 12 | 35 | 650 | 900÷1100 | 10 | 280 | |||
| *This values are valid also for Cold Drawn - Quenched + Tempered Condition (+C +QT). Note: For size <5 mm the mechanical properties may be agreed at the time of enquiry and order. |
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Working Temperatures Recommended
| Operation | °C |
|---|---|
| Hot forgings deformation | 850÷1150 |
| Isothermal annealing | 830÷860-->650 |
| Soft annealing | 680÷720 |
| Quenching in water or oil | 830÷850 |
| Tempering | 550÷650 |
Hardness Limits (Jominy Test)
| 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 | 61 | 61 | 61 | 60 | 60 | 59 | 59 | 58 | 56 | 53 | 51 | 48 | 47 | 46 | 45 | |||||
| Min | 53 | 53 | 52 | 51 | 49 | 43 | 40 | 37 | 34 | 32 | 31 | 30 | 30 | 29 | 29 | ||||||
| +HH | Max | 61 | 61 | 61 | 60 | 60 | 59 | 59 | 58 | 56 | 53 | 51 | 48 | 47 | 46 | 45 | |||||
| Min | 56 | 56 | 55 | 54 | 52 | 48 | 46 | 44 | 41 | 39 | 38 | 36 | 36 | 35 | 34 | ||||||
| +HL | Max | 58 | 58 | 58 | 57 | 56 | 54 | 53 | 51 | 49 | 46 | 44 | 42 | 41 | 40 | 40 | |||||
| Min | 53 | 53 | 52 | 51 | 49 | 43 | 40 | 37 | 34 | 32 | 31 | 30 | 30 | 29 | 29 | ||||||
