GB/T 3077 12Cr1MoV steel has a high thermal strength and anti-oxidant properties, have higher durable plastic. The production process is relatively simple, and good weldability, but normalizing cooling rate sensitive.
Chemical composition of 12Cr1MoV
| The Element Max (%) | Data |
|---|---|
| C | 0.08~0.15 |
| Si | 0.17~0.37 |
| Mn | 0.40~0.70 |
| P | 0.035 |
| S | 0.035 |
Mechanical property of 12Cr1MoV
| Grade | Property | |||
|---|---|---|---|---|
| Thickness | Yield | Tensile | HB | |
| 12Cr1MoV | mm | Min Mpa | Mpa | HB |
| 6-50 | 245 | 490 | ||
| 50-200 | 245 | 490 | ||
Main features of 12Cr1MoV
Compared with 12CrMoV steel, this steel has higher oxidation resistance and thermal strength. The creep limit of the steel is very close to the value of the endurance strength, and it has high plasticity under the condition of the endurance tension. The technology and weldability of the steel are good, but the preheating is required to 300℃ before welding, and the stress is removed after welding.
It is a kind of steel widely used in superheater, header and main steam pipe of high pressure, ultra high pressure, subcritical power station boiler. At 580℃, it still has high thermal strength, oxidation resistance and durable plasticity. The production process is simple and the welding performance is good, but it is sensitive to the normalizing cooling speed. Long-term use at 580℃ will result in the second kind of temper brittleness caused by the segregation of phosphorus and other impurities at grain boundary. Long–term use will also appear pearlite spherification.
What is the difference between 12Cr1MoV and 12CrMoV
- 12Cr1MoV, Cr: 0.90 ~ 1.20. Uniform number code: A31132. Executive standard: GB/T 3077-1999
- 12CrMoV, Cr: 0.30 ~ 0.60. Uniform number code: A31122. Executive standard: GB/T 3077-1999
All of them are pearlite type heat-resistant steel, which has high tissue stability and thermal strength when used in high temperature for a long time. Compared with 12Cr1MoV steel, Cr content is higher, with higher oxidation resistance and thermal strength. Creep limit is close to the endurance strength value and has higher plasticity under the condition of endurance tension. The technology and weldability of the steel are good, but the preheating is required to 300℃ before welding, and the stress is removed after welding.
12CrMoV and 12Cr1MoV alloy steel, API 5L X52 steel with the thickness range is 1.2-40mm, the width range is 1220-4200mm, and the length range is 5000-18000mm. API 5L X52 steel’s mechanical properties is the yield strength 300MPa, and the tensile strength 460MPa. To be specified in details: Maximum content for C≤0.28%, Mn≤1.4%, P≤0.030%, S is 0.030%, V+Nb+Ti≤0.15%, Copper maximum is 0.50%, nickel maximum 0.50%, chromium 0.50%, Molybdenum 0.15%.
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