The main applications of these grades of steel are rotors of steam turbines, rotor blades, shaft forgings, reservoirs and covers for up to 550 ℃ temperatures, nuts, tubes for high temperatures up to 540 ℃.
Chemical composition % of steel 21CrMoV5-7 (1.7709): EN 10269-1999
| C | Si | Mn | Ni | P | S | Cr | Mo | V | Al |
| 0.17 - 0.25 | max 0.4 | 0.4 - 0.8 | max 0.6 | max 0.03 | max 0.03 | 1.2 - 1.5 | 0.55 - 0.8 | 0.2 - 0.35 | max 0.03 |
DIN 21CrMoV5-7 steel / W-Nr. 1.7709 Steel Regular size and Tolerance
Hot Rolled round bar
| Diameter(mm) | Diameter Tolerance(mm) |
| ≤12.70 | -0.13 ～0.30 |
| 12.7～25.40 | -0.13～0.41 |
| 25.4～38.10 | -0.15～0.51 |
| 38.1～50.80 | -0.20～0.64 |
| 50.80～63.50 | -0.25～0.76 |
| 63.50～76.20 | -0.25～1.02 |
| 76.20～101.60 | -0.30～+1.27 |
| 101.60～203.20 |
-0.38～3.81 |
21CrMoV5-7 steel MECHANICAL PROPERTIES – HOT WORKING, HEAT TREATMENT AND HARDNESS
| Hot working temperature /℃: | 1100~850 |
| Heat treatment temperature /℃|annealing / normalizing: | 650~730 |
| Heat treatment temperature /℃|quenching: | 890~940(Oil or Air) |
| Heat treatment temperature /℃|tempering: | 680~720 |
| HBW: 205~250 | 205~250 |
| Tensile strength, (≥)|σb/MPa: | 700～850 |
| Yield strength, (≥)|σs/MPa: | 550 |
| Elongation, (≥)|δ5(%): | 16 |
| Impact, (≥)|AKV/J: | 69 |
MECHANICAL PROPERTY UNDER HIGH TEMPERATURE
| Yield strength σ0.2≥/MPa|200℃: | 500 |
| Yield strength σ0.2≥/MPa|300℃: | 460 |
| Yield strength σ0.2≥/MPa|350℃: | 441 |
| Yield strength σ0.2≥/MPa|400℃: | 412 |
| Yield strength σ0.2≥/MPa|450℃: | 372 |
| Yield strength σ0.2≥/MPa|500℃: | 334 |
some other grade we can produce
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