OTAI SPECIAL STEEL is 21CrMoV5-7 steel suppliers and stockholders in china. We have more 16 years experience in 21CrMoV5-7 steel / W-Nr. 1.7709 steel supply.
21CrMoV5-7 Steel is a high quality High Temperature Alloy Structural steel, 21CrMoV5-7, code: 1.7709 standard: DIN17240-1976, with heat treatment state: 890-940 ℃ quenching, 680-720 ℃ high temperature tempering (at least 2 h) yield strength, N/mm squared: min. 550 tensile strength, N/mm squared: 700-850 such as mechanical propert.
Related Specifications astm A29/A29M DIN EN 10083/3 JIS G4053 GB GB/T 3077
1. 21CrMoV5-7 Chemical composition
| C(％) | Si(％） | Mn(％) | P(％) | S(％) | Cr(％) | Mo(％) | V（％） |
| 0.17~0.25 | 0.15～0.35 | 0.35～0.85 | ≤0.030 | ≤0.035 | 1.20～1.50 | 0.65-0.80 | 0.25～0.35 |
2.Form of Supply
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- sheet
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- Round
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- Plate
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- Square
DIN 21CrMoV5-7 Alloy structural steel, we can supply the 21CrMoV5-7 round bar, steel flat bar, plate, hexagonal steel bar and steel square block. 21CrMoV5-7 steel Round bar can be sawn to your required lengths as one offs or multiple cut pieces. 21CrMoV5-7 Rectangular pieces can be sawn from flat bar or plate to your specific sizes. Ground tool steel bar can be supplied, providing a quality precision finished bar to tight tolerances.
21CrMoV5-7 steel Round sheet Square Plate / W-Nr. 1.7709 Steel Round sheet Square Plate
3.DIN 21CrMoV5-7 steel Applications
DIN 21CrMoV5-7 Tool steel is a alloy structural steel, 21CrMoV5-7 steel is used for engineering structural, like high tensile shafts, bolts and nuts, gears, pinions and spindles. Locomotive traction with the big gear, supercharger drive gear, pressure vessel, rear axle, gear load of connecting rod and a spring clip,21CrMoV5-7 steel can also be used to under 2000 m deep well of oil drill pipe joint and the fishing tool, and can be used for bending machine mould, etc
4. DIN 21CrMoV5-7 steel / W-Nr. 1.7709 Steel Regular size and Tolerance
1) 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 |
2) Hot Rolled steel plate
| Diameter(mm) | Diameter Tolerance(mm) |
| ≤25.4 | -0.41～0.79 |
| 25.4～76 | -0.79～1.19 |
| 76～127 | -1.19～1.60 |
| 127～178 | -1.60～2.39 |
| 178～254 | -1.98～3.18 |
| 254～305 | -2.39～3.96 |
Others 21CrMoV5-7 steel have not specified size, pls contact our experienced sales team.
5. 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 |
6. 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 |
7. Processing
21CrMoV5-7 tool steel round bar and flat sections can be cut to your required sizes. 21CrMoV5-7 tool steel ground bar can also be supplied, providing a high quality tool steel precision ground tool steel bar to your required tolerances. 21CrMoV5-7 steel is also available as Ground Flat Stock / Gauge Plate, in standard and nonstandard sizes.
Contact our experienced sales team to help you with your21CrMoV5-7 Tool steel questionsadn enquiry by Email or Telphone. The questions will be reply in 24 hours.
OTAI SPECIAL STEEL CO., LTD
Email: jack@otaisteel.com TEL: 0086-769-33232622 FAX: 0086-769-88705839
