Non-alloy steel quenchable and temperable in water and oil, allows higher mechanical characteristics to be obtained. It is one of the most used steels in Europe.
Standard Reference: EN ISO 683-1: 2018 (Hot-rolled products) | EN 10277: 2018 (Bright products)
| EUROPE | ITALY | GERMANY | FRANCE | UK | USA | ||
|---|---|---|---|---|---|---|---|
| EN 10083-2: 2006 EN 10277-5: 2008 |
(UNI 7845-78) | (DIN 17200-86) | (NF A 35-552-86) | (BS 970 pt.3-96) | ASTM A 29 | ||
| Grade | N° | Werkstoff | N° | ||||
| C40E | 1.1186 | C40 | Ck40 | 1.1186 | XC38 | 080M40 | 1040 |
| C40R | 1.1189 | Cm40 | 1.1189 | ||||
| EUROPE | C | Si | Mn | P/max | S | Cr/max | Mo/max | Ni/max | Cu/max | Al | Pb |
|---|---|---|---|---|---|---|---|---|---|---|---|
| C40E | 0,37÷0,44 | 0,10÷0,40 | 0,50÷0,80 | 0,025 | ≤ 0,035 | 0,40 | 0,10 | 0,40 | 0,30 | - | - |
| C40R | 0,020÷0,040 | 0,020÷0,050 | - | ||||||||
| C40RPb | 0,020÷0,040 | 0,020÷0,050 | 0,15÷0,30 |
| Size (mm) |
HB max to condition | Quenched and tempered (+QT) |
Normalized (+N) |
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|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Treated to improve shearability (+S) |
Soft annealing (+A) |
Rp0,2 (MPa) min |
Rm (MPa) min |
A5 (%) min |
Z (%) min |
KV (J) min |
Rp0,2 (MPa) min |
Rm (MPa) min |
A5 (%) min |
|||
| d≤16 | it can be sheared without heat treatment |
- | 460 | 650÷800 | 16 | 35 | 20 | 320 | 580 | 16 | ||
| 16<d≤40 | - | 400 | 630÷780 | 18 | 40 | 20 | 290 | 550 | 17 | |||
| 40<d≤100 | - | 350 | 600÷750 | 19 | 45 | 20 | 290 | 550 | 17 | |||
| 100<d≤160 | - | - | - | - | - | - | 260 | 530 | 17 | |||
| 160<d≤250 | - | - | - | - | - | - | 260 | 530 | 17 | |||
| Size (mm) |
Rolled+Turned (+SH) |
Quenched+Tempered+Turned (+QT +SH)* |
Quenched+Tempered+Cold Drawn (+QT +C) |
Cold Drawn (+C) |
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sertlik (HB) |
Rm (MPa) | Rp0,2 (MPa) min |
Rm (MPa) min |
A5 (%) min |
KV (J) min |
Rp0,2 (MPa) min |
Rm (MPa) | A5 (%) min |
Rp0,2 (MPa) min |
Rm (MPa) | A5 (%) min |
||
| 5≤d≤10 | - | - | - | - | - | - | 560 | 800÷1000 | 8 | 540 | 700÷1000 | 6 | |
| 10<d≤16 | - | - | - | - | - | - | 525 | 750÷950 | 8 | 460 | 650÷980 | 7 | |
| 16<d≤40 | 164÷207 | 550÷710 | 400 | 630÷780 | 18 | 30 | 490 | 680÷880 | 9 | 365 | 620÷920 | 8 | |
| 40<d≤63 | 164÷207 | 550÷710 | 350 | 600÷750 | 19 | 30 | 435 | 620÷820 | 10 | 330 | 590÷840 | 9 | |
| 63<d≤100 | 164÷207 | 550÷710 | 350 | 600÷750 | 19 | 30 | 420 | 600÷800 | 11 | 290 | 550÷820 | 9 | |
| *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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| Operation | °C |
|---|---|
| Hot forgings deformation | 850÷1150 |
| Normalizing | 860÷900 |
| Soft annealing | 650÷700 |
| Quenching in oil or water | 840÷880 |
| Tempering | 550÷660 |
| Limits of range | Hardness HRC at a distance from quenched end of test pieces (mm) | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 13 | 15 | 20 | 25 | 30 | |||||||
| +H | Max | 60 | 60 | 59 | 57 | 53 | 47 | 39 | 34 | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | |||||
| Min | 51 | 46 | 35 | 27 | 25 | 24 | 23 | 22 | 21 | 20 | - | - | - | - | - | - | ||||||
