Prediction of the Residual Creep Life of SA335-P22 Steel Main Steam Pipelines
Abstract
:1. Introduction
2. Physical and Chemical Tests and Result Analysis
2.1. Chemical Composition Analysis
2.2. Mechanical Properties
2.2.1. Tension Test at Room Temperature
2.2.2. Tensile Test at High Temperatures
2.3. Metallographic Test and Result Analysis
2.3.1. Metallographic Tests
2.3.2. Analysis of the Results
- (1)
- Metallographic analysis of the external surface
- (2)
- Metallographic analysis of the inner surface
3. Life Assessment
3.1. Creep Test
3.2. Calculation of the Working Stress
3.3. Assessment of Residual Life
3.3.1. Basic Principles of the θ Parameter Method
- (1)
- A group of samples was tested at different temperatures and stress levels, and the creep fracture curves of each sample at a certain temperature and stress were obtained.
- (2)
- We used Equation (1) to fit the creep fracture curve of each sample under different temperatures and stresses, and solved (i = 1, 2, 3) in the creep equation of each sample:
- (1)
- We used from Equation (1), the temperature of the test (T), and the stress (σ) to obtain , , , and in Equation (2). On this foundation, the relationship between , T, and σ was established.
- (2)
- We used , , , and achieved in Equation (2) to allocate under the condition of specified temperature and pressure. Then, was substituted into Equation (1) to obtain the material creep curve.
- (3)
- As stipulated in DL/T 940-2005 (technical guidelines for life assessment of steam pipes in thermal power plants) [24], the creep life can be determined by determining the creep strain at the transition tangent point from the second stage (approximate straight line) to the third stage as the failure point on the creep deformation curve of materials under the service conditions of steam pipes.
3.3.2. Extrapolation Analysis
4. Conclusions
- (a)
- During actual operation, the operating parameters of the P22 steam pipeline should be strictly monitored to allow it to operate under allowable operating conditions, to avoid safety events.
- (b)
- In the next periodic inspection and shutdown maintenance, the P22 steam pipeline should be the main inspection object to receive attention. If necessary, the service cycle of the P22 steam pipeline could be shortened.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Material | Medium | Dimension/Thickness (mm) | Design Temperature (°C) | Design Pressure (MPa) | Working Temperature (°C) | Working Pressure (MPa) | Spheroidization Degree |
---|---|---|---|---|---|---|---|
P22 | Steam | 219/20.6 | 524 | 8.5 | 510 | 7.0 | Moderate |
Material | C | Mn | p | S | Si | Cr | Mo | Other |
---|---|---|---|---|---|---|---|---|
ASME SA335-P22 | 0.05–0.15 | 0.30–0.60 | ≤0.025 | ≤0.025 | ≤0.50 | 1.90–2.60 | 0.87–1.13 | - |
Result | 0.10 | 0.43 | 0.014 | 0.005 | 0.24 | 2.09 | 0.94 | |
Conclusion | Meets ASME SA335 requirements for new P22 pipes |
Sampling Position | Sample | Rp0.2/MPa | Rm/MPa | A/% |
---|---|---|---|---|
SA335/SA335M | - | ≥205 | ≥415 | ≥22 (portrait) |
Near the outer wall | 1 | 322 | 538 | 31.5 |
2 | 326 | 542 | 28.5 | |
3 | 316 | 532 | 26.5 | |
Near the middle wall | 1 | 344 | 553 | 35.0 |
2 | 350 | 559 | 30.5 | |
3 | 330 | 534 | 29.5 | |
Near the inner wall | 1 | 334 | 536 | 25.0 |
2 | 349 | 557 | 26.5 | |
3 | 351 | 557 | 29.5 | |
Conclusion | Room temperature longitudinal tension meets the requirements of ASME SA335/SA335M for the P22 new pipe |
Sampling Position | Sample | Rp0.2/MPa | Rm/MPa | A/% |
---|---|---|---|---|
SA335/SA335M | - | ≥205 | ≥415 | ≥14 (portrait) |
Near the middle wall | 1 | 343 | 553 | 25.5 |
2 | 346 | 554 | 28.0 | |
3 | 346 | 556 | 28.0 | |
Near the inner wall | 1 | 345 | 544 | 26.0 |
2 | 348 | 546 | 26.0 | |
3 | 331 | 541 | 29.0 | |
Conclusion | Room temperature longitudinal tension meets the requirements of ASME SA335/SA335M for P22 new pipe |
Sampling Position | Sample | Rp0.2/MPa | Rm/MPa | A/% |
---|---|---|---|---|
12Cr2MoG (500 °C) | - | ≥173 | - | - |
12Cr2MoG (550 °C) | - | ≥159 | - | - |
10CrMo910 (500 °C) | - | ≥180 | - | - |
Near the outer wall | 1 | 286 | 442 | 21.5 |
2 | 268 | 427 | 22.5 | |
3 | 276 | 432 | 24.0 | |
Near the middle wall | 1 | 301 | 451 | 23.0 |
2 | 278 | 437 | 21.5 | |
3 | 286 | 443 | 23.0 | |
Near the inner wall | 1 | 281 | 440 | - |
2 | 301 | 452 | 23.0 | |
3 | 305 | 457 | 22.0 | |
Conclusion | The yield strength at 540 °C was higher than 12Cr2MOG at 500 °C in GB/T5310-2017 and 10CrMo910 at 500°C in DL/T999-2006. |
Sampling Position | Sample | Rp0.2/MPa | Rm/MPa | A/% |
---|---|---|---|---|
12Cr2MoG (500 °C) | - | ≥173 | - | - |
12Cr2MoG (550 °C) | - | ≥159 | - | - |
10CrMo910 (500 °C) | - | ≥180 | - | - |
Near the outer wall | 1 | 276 | 431 | 24.0 |
2 | 278 | 424 | 22.5 | |
Near the middle wall | 1 | 281 | 441 | 22.0 |
2 | 275 | 433 | 24.5 | |
3 | 279 | 421 | 24.0 | |
Near the inner wall | 1 | 272 | 435 | 23.0 |
2 | 264 | 413 | 25.5 | |
3 | 290 | 447 | 20.5 | |
Conclusion | The yield strength at 580 °C was higher than 12Cr2MOG at 500 °C in GB/T5310-2017 and 10CrMo910 at 500°C in DL/T999-2006. |
Temperature (°C) | Stress (MPa) | θ1 | θ2 | θ3 |
---|---|---|---|---|
540 | 218 | 1.3458 × 10−3 | 9.9846 × 10−6 | 0.0733 |
208 | 3.1977 × 10−4 | 2.3522 × 10−6 | 0.02743 | |
198 | 2.3577 × 10−4 | 1.3341 × 10−6 | 0.0201 | |
178 | 3.4904 × 10−5 | 9.5889 × 10−6 | 0.0035 | |
168 | 4.7631 × 10−5 | 2.5901 × 10−6 | 0.0041 | |
580 | 170 | 7.6631 × 10−4 | 3.4986 × 10−6 | 0.0596 |
160 | 2.8969 × 10−4 | 2.0798 × 10−6 | 0.0294 | |
150 | 1.6092 × 10−4 | 4.2577 × 10−7 | 0.0186 | |
140 | 1.0447 × 10−4 | 2.1470 × 10−6 | 0.0103 |
θi | a | b | c | d |
---|---|---|---|---|
θ1 | −74.6496 | 0.2222 | 0.07810 | −0.0002 |
θ2 | 55.1724 | −0.3212 | −0.0739 | 0.0004 |
θ3 | −61.4492 | 0.1739 | 0.0656 | −0.0002 |
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Wang, Z.; Ye, Y.; Dong, L.; Wang, B. Prediction of the Residual Creep Life of SA335-P22 Steel Main Steam Pipelines. Processes 2023, 11, 162. https://doi.org/10.3390/pr11010162
Wang Z, Ye Y, Dong L, Wang B. Prediction of the Residual Creep Life of SA335-P22 Steel Main Steam Pipelines. Processes. 2023; 11(1):162. https://doi.org/10.3390/pr11010162
Chicago/Turabian StyleWang, Zhicheng, Youjun Ye, Lingjian Dong, and Bumei Wang. 2023. "Prediction of the Residual Creep Life of SA335-P22 Steel Main Steam Pipelines" Processes 11, no. 1: 162. https://doi.org/10.3390/pr11010162
APA StyleWang, Z., Ye, Y., Dong, L., & Wang, B. (2023). Prediction of the Residual Creep Life of SA335-P22 Steel Main Steam Pipelines. Processes, 11(1), 162. https://doi.org/10.3390/pr11010162