21CrMoV5-7 – Nr.1.7709
Alloy steel with chrome molybdenum vanadium, generally used for boilers, steel that resists at high temperatures up to about 550° C, generally used for particulars and shafts for turbines, nuts and tubes
References and Comparable Standards
Standard Reference: EN 10269: 2013 (Bright products)
| EUROPE |
ITALY |
GERMANY |
FRANCE |
UK |
USA |
| EN 10269: 2003 |
(UNI 7845-78) |
(DIN 17200-86) |
(NF A 35-552-86) |
(BS 970 pt.3-96) |
ASTM A 29 |
| Grade |
N° |
|
Werkstoff |
N° |
|
|
|
| 21CrMoV5-7 |
1.7709 |
- |
- |
- |
- |
- |
- |
Chemical Composition (Cast Analysis) (%)
| C |
Si/max |
Mn |
P/max |
S |
Cr |
Mo |
B |
Ni/max |
Al/max |
V |
| 0,17÷0,25 |
0,40 |
0,40÷0,80 |
0,025 |
≤ 0,030 |
1,20÷1,50 |
0,55÷0,80 |
0,0010÷0,0050 |
0,60 |
0,030 |
0,20÷0,35 |
Mechanical Properties
Size
(mm) |
Treated to improve shearability (+S) |
Spheroidized annealed (+AC) |
Quenched and tempered (+QT) |
| HB max to condition |
Rp0,2 (MPa) min |
Rm (MPa) min |
A5 (%) min |
Z (%) min |
KV (J) min + 20°C |
| d≤160 |
255 |
229 |
550 |
700÷850 |
16 |
60 |
63 |
Working Temperatures Recommended
| Operation |
°C |
| Hot forgings deformation |
850÷1150 |
| annealed to achieve spheroidized carbides |
680÷720 |
| Soft annealing |
650÷730 |
| Quenching in water or oil |
880÷950 |
| Tempering |
660÷740 |
