Widely used quenched and tempered steel, with mechanical characteristics superior to those of the AISI 410 base type at the quenched and tempered state.
Standard Reference: EN 10088-3: 2014 (Hot-rolled and bright products)
| EUROPE | ITALY | GERMANY | FRANCE | UK | USA | ||
|---|---|---|---|---|---|---|---|
|
EN 10088-3: 2005 |
(UNI 6900: 71) |
|
(NF A 35-574-90) |
(BS 970 pt. 3 -91) |
AISI | ||
| Grade | N° | Werkstoff | N° | ||||
| X20Cr13 | 1.4021 | X20Cr13 | X20Cr13 | 1.4021 | Z20C13 | 420S29 - 420S37 | 420 |
| C | Si / max | Mn / max | P / max | S /max | Cr |
|---|---|---|---|---|---|
| 0,16÷0,25 | 1,00 | 1,50 | 0,040 | 0,030 | 12,0÷14,0 |
| Size (mm) | Heat treatment | Hardness HB max* | Rp 0,2 (MPa) min | Rm (MPa) | A5 (%) min | KV (J) min |
|---|---|---|---|---|---|---|
| d≤100 | Annealed (+A) | 230 | - | 760 max | - | - |
| Quenched + Tempered (+QT 700) | - | 500 | 700÷850 | 13 | 25 | |
| Quenched + Tempered (+QT 800) | - | 600 | 800÷950 | 12 | 20 | |
| * Only for guidance. | ||||||
| Size (mm) | Annealed | Quenched + Tempered | |||||
|---|---|---|---|---|---|---|---|
| Rm (MPa) max | HB max* | Heat treatment | Rp 0,2 (MPa) min | Rm (MPa) max | A5 (%) min** | KV (J) min | |
| d≤10 | 910 | 290 | Quenched + Tempered (+QT 700) |
600 | 750÷1000 | 8 | - |
| 10<d≤16 | 910 | 290 | 550 | 750÷1000 | 8 | - | |
| 16<d≤40 | 850 | 260 | 500 | 700÷950 | 10 | 25 | |
| 40<d≤63 | 800 | 250 | 500 | 700÷900 | 12 | 25 | |
| 63<d≤100 | 760 | 230 | 500 | 700÷850 | 13 | 25 | |
| * For reference only. ** Values valid only for size ≥5 mm. |
|||||||
| Tensile strength levels | Rm (MPa) |
|---|---|
| +C 500 | 500÷700 |
| +C 650 | 650÷850 |
| +C 800 | 800÷1000 |
| +C 900 | 900÷1100 |
| Note: The desired tensile strength level shall be evaluated depending on diameter required. |
|
| Size | A (%) max | Rm (MPa) max |
|---|---|---|
| 0,50≤d≤1,00 | 10 | 1100 |
| 1,00≤d≤3,00 | 10 | 1050 |
| 3,00≤d≤5,00 | 10 | 1000 |
| 5,00≤d≤16,00 | 15 | 950 |
| Note: If skin passed, Rm might be increased by up to 50 MPa. | ||
| Operation | °C |
|---|---|
| Hot forgings deformation | 900÷1100 |
| Annealing (air) | 745÷825 |
| Quenching in air or oil | 950÷1000 |
| Tempering (QT 700) | 600÷750 |
| Tempering (QT 800) | 600÷700 |
