Steel with a low chrome, nickel, and carbon content. Suitable for small pieces. It has a good cold deformability at the globular annealed state.
Standard Reference: UNI 7846: 78 (Hot-rolled and hot-rolled + turned products) | UNI 10233-5: 93 (Bright products)
| EUROPE | ITALY | GERMANY | FRANCE | UK | USA | ||
|---|---|---|---|---|---|---|---|
| EN 10084:2008 EN 10277-4:2008 |
(UNI 7846-78) | (DIN 17210-84) | (NFA35-551-86) | (BS970 pt.3--91) | ASTM A 29 | ||
| Grade | N° | Werkstoff | N° | ||||
| - | - | 12NiCr3 | 20MnCrS5 | 1.7149 | - | - | - |
| EUROPE | C | Si | Mn | P/max | S | Cr | Mo/max | Ni | Al | Pb |
|---|---|---|---|---|---|---|---|---|---|---|
| 12NiCr3 | 0,09÷0,15 | 0,15÷0,40 | 0,30÷0,60 | 0,035 | 0,020÷0,035 | 0,40÷0,70 | 0,10 | 0,50÷0,80 | 0,020÷0,050 | - |
| 12NiCr3Pb | 0,15÷0,30 |
| Hardness (HB) Soft annealed |
Hardness (HB) Spherodizing |
Annealing to obtain a particular structure | ||||
|---|---|---|---|---|---|---|
| ≤ 179 | ≤ 161 | ≥ 131 | ≤ 200 | |||
| Size (mm) |
Cold drawn products obtained from annealed hot rolled products | Annealed + Cold drawn or annealed + Turned products | |||||
|---|---|---|---|---|---|---|---|
| Soft annealed HB max |
Isothermal annealed HB max |
Soft annealed HB max |
Isothermal annealed HB |
||||
| 5≤d≤10 | 245 | 245 | 182 | 135÷203 | |||
| 10<d≤16 | 235 | 235 | 182 | 135÷203 | |||
| 16<d≤40 | 230 | 230 | 179 | 131÷200 | |||
| 40<d≤100 | 230 | 230 | 179 | 131÷200 | |||
| Note: For size <5 mm the mechanical properties may be agreed at the time of enquiry and order. | |||||||
| Operation | °C |
|---|---|
| Hot forgings deformation | 900÷1150 |
| Carburizing temperature | 870÷900 |
| Core quenching temperature | 850÷880 |
| Case quenching temperature | 780÷820 |
| Tempering | 150÷200 |
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