A steel produced at the quenched and tempered state according to the United States standard ASTM A-193, it is used for linkages and bolts destined for the oil industry. Analytically similar to the 40CrMoV4-6 type of the European standard EN 10269. It has greater temperability than the previous type thanks to the higher amount of alloy elements.
Standard Reference: ASTM A 193
| EUROPE | ITALY | GERMANY | FRANCE | UK | USA | |||
|---|---|---|---|---|---|---|---|---|
| EN 10083-3: 2006 | (UNI 7845-78) | (DIN 17200 - 86) | (NF A 35-552-86) | (BS 970 pt. 1 - 96) | ASTM A 193 | |||
| Grade | N° | Werkstoff | N° | |||||
| - | - | - | - | - | - | - | B16 | |
| C | Si | Mn | P/max | S/max | Cr | Mo | V | Al/max |
|---|---|---|---|---|---|---|---|---|
| 0,36÷0,47 | 0,15 ÷ 0,35 | 0,45÷0,70 | 0,035 | 0,040 | 0,80 ÷ 1,15 | 0,50 ÷ 0,65 | 0,25 ÷ 0,35 | 0,015 |
| Size (mm) |
Rp 0,2 (MPa) min |
Rm (MPa) min |
A4 (%) min |
Z (%) min |
Hardness max |
|
|---|---|---|---|---|---|---|
| d≤M64** | 725 | 860 | 18 | 50 | 321 HB or 35 HRC | |
| M64<d≤M70** | 655 | 760 | 17 | 45 | 302 HB or 33 HRC | |
| * Minimum tempering temperature 620°C. **Thread diameter. |
||||||
| Operation | °C |
|---|---|
| Hot forgings deformation | 900÷1150 |
| Soft annealing | 650÷700 |
| Quenching in oil | 925÷954 |
| Tempering | 650÷730 |
