21CrMoV5-11 | 21CrMoV5-7 steel Manufacturer and Exporter,supplied with round,square,flat,block,and shaft etc.
21CrMoV5-7 steel,also refers to DIN 1.7709, is defined as pearlitic heat-resistant steel with high content Cr and Mo as per EN 10269 Standard.While 21CrMoV5-11,with higher Mo content(1%),can be seen as an upgraded version of 21CrMov5-7 steel.
Both of them can work at around 500 degrees for a long time and are mainly used in petrochemical, coal conversion, nuclear power, steam turbine cylinders, thermal power and other occasions with harsh conditions and corrosive media. Main applications: rolls, boilers, reactors, heaters, steam generation device, etc.
21CrMoV5-11 / 21CrMoV5-7 STEEL SUPPLY FORM & SIZE & TOLERANCE
Hot Forged Round bar:Φ80-Φ1000mm
Hot Rolled Round bar:Φ16-Φ130mm
Hot Forged Square bar: Max Thickness:500mm
Flat bar/Blcoks:Thickness :120-800mm ,Width:120-1500mm
| Surface Finish | Black-Forged | Black-Rolled | Turned | Grinding | Polished | Peeled | Cold Drawn |
| Tolerance | (0，+5mm) | (0，+1mm) | (0，+3mm) | Best h9 | Best h11 | Best H11 | Best H11 |
21CrMoV5-11 / 21CrMoV5-7 STEEL CHEMICAL COMPOSITION
| Grade | C | Si | Mn | P | S | Cr | Mo | Ni | V |
| 21CrMoV5-7/1.7709 | 0.17-0.25 | ≤0.4 | 0.4-0.8 | ≤0.025 | ≤0.03 | 1.2-1.5 | 0.55-0.8 | ≤0.6 | 0.20-0.35 |
| 21CrMoV5-11/1.8070 | 0.17-0.25 | 0.3-0.6 | 0.3-0.6 | ≤0.025 | ≤0.03 | 1.2-1.5 | 1.0-1.2 | ≤0.6 | 0.25-0.35 |
21CrMoV5-11 / 21CrMoV5-7 STEEL FORGING
- Initial Forging Temperature：1100℃
- Final Forging Temperature：850℃
- Forging Ratio：above 4:1
- Post-Forging Treatment:21CrMoV5-11 / 21CrMoV5-7 steel,as high Cr-Mo steel, is prone to cracks due to improper cooling after forged,so the recommended method is to arrange annealing heat treatment immediately after forged,the purpose is to slowly cool the material and eliminate the huge internal stress after forging.
21CrMoV5-7 STEEL PHYSICAL PROPERTY
| Density g/cm3 | 7.85 | ||||||
| Thermal conductivity W/(m.K) | 33 | ||||||
| Specific thermal capacity J/(kg.K) | 460 | ||||||
Static modulus of elasticity Gpa | 20 ℃ | 100 ℃ | 200 ℃ | 300 ℃ | 400 ℃ | 500 ℃ | 600 ℃ |
| 211 | 204 | 196 | 186 | 177 | 164 | 127 | |
Coefficient of thermal expansion 10^-6.(1/K) | 100 ℃ | 200 ℃ | 300 ℃ | 400 ℃ | 500 ℃ | 600 ℃ | |
| 11.1 | 12.1 | 12.9 | 13.5 | 13.9 | 14.1 | ||
21CrMoV5-11 / 21CrMoV5-7 STEEL OPERATING TEMPERATURE
- 21CrMoV5-7 Steel Operating temperature: <540℃
- 21CrMoV5-11 Steel Operating temperature: <480℃
21CrMoV5-11+QT Forged round steel
21CrMoV5-11 / 21CrMoV5-7 STEEL HEAT TREATMENT
21CrMoV5-11 / 21CrMoV5-7 Steel High Temperature Tempering
The recommended high temperature tempering temperature of 21CrMoV5-11/21CrMoV5-7 steel is 690-710 ℃, air cooling, and the surface hardness of the material after tempering is not greater than 241HB.
21CrMoV5-7 Steel Quenching & Tempering(QT)
- Quenching Temperature:930-950℃
- Quenching Medium:Oil
- Tempering Temperature:700-740℃
Mechanical Properties for 21CrMoV5-7 Steel
| Tensile Strength Mpa | Yield Strength Mpa | Elongation % | Reduction of Area % | Impact Charpy-V J | Hardness HBW |
| 700-850 | ≥550 | ≥16 | ≥60 | ≥63 | 248-293 |
21CrMoV5-7 Steel Min Rp0.2 Proof Strength at Different Temperature
| Temperature,℃ | 50℃ | 100℃ | 150℃ | 200℃ | 250℃ | 300℃ | 350℃ | 400℃ | 450℃ | 500℃ |
| Rp0.2 Proof Strength Min,Mpa | 542 | 530 | 515 | 500 | 480 | 460 | 435 | 410 | 380 | 350 |
21CrMoV5-11 Steel Quenching & Tempering(QT)
- Quenching Temperature:890-940℃
- Quenching Medium:Oil
- Tempering Temperature:680-720℃
Mechanical Properties for 21CrMoV5-11 Steel
| Tensile Strength Mpa | Yield Strength Mpa | Elongation % | Reduction of Area % | Impact Charpy-V J | Hardness HBW |
| 700-850 | ≥550 | ≥16 | ≥60 | ≥69 | 210-250 |
