Sichuan Liaofu Special Steel Company is one of the most experienced manufacturers and suppliers of 21crmov5-7 1.7709 alloy special steel in China. With over 20 years' experience, our factory offer high quality products made in China with competitive price. Welcome to contact us for wholesale service.
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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