GB/T 21833.2-2020 in English
VALIDSeamless austenitic-ferritic (duplex) stainless steel tubes and pipes—Part 2:Pipes for fluid service
- Issued on:2020-04-28
- Implemented on:2020-11-01
- File Format:PDF
- Delivery:Within 1 day
$148.00
| Standard No: | GB/T 21833.2-2020 |
| Document status: | VALID |
| Title in English: | Seamless austenitic-ferritic (duplex) stainless steel tubes and pipes—Part 2:Pipes for fluid service |
| Title in Chinese: | 奥氏体-铁素体型双相不锈钢无缝钢管 第2部分：流体输送用管 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Within 1 day |
| Issued on: | 2020-04-28 |
| Implemented on: | 2020-11-01 |
| ICS Classification: | 77.140.75-Steels pipes and tubes for specific use |
| Chinese Classification: | H48-Steel tube and cast iron pipe |
| Professional Classification: | GB-National Standard |
| Related Keywords: | stainless steel tubes
pipes part intergranular corrosion test pitting corrosion test quality control test items method |
| Related Topics: | ferrite
size Austenitic steel Ferritic steel ferrite GB/T 21833.2 GB/T 21833.2-2020 Seamless steel pipe for liquid fluid Liquid conveying seamless steel pipe Steel pipe body out-of-roundness detection stainless steel ferrite |
《GB/T 21833.2-2020奥氏体-铁素体型双相不锈钢无缝钢管 第2部分：流体输送用管》由TC183（全国钢标准化技术委员会）归口，TC183SC1（全国钢标准化技术委员会钢管分会）执行，主管部门为中国钢铁工业协会。
Introduction
Analysis of Standard Technology Evolution
| Technical Indicators | Requirements of the 2008 Edition | Changes in the 2020 Edition |
|---|---|---|
| Outer Diameter Deviation of Steel Pipe | ±1.25%~1.5% | Newly Added Advanced Precision±1%~±1.25% |
| Wall Thickness Control | +15%~-12.5% | Optimized to +12.5%~-10% |
| Test Items | 7 Basic Tests | Five new items including ultrasonic testing and intergranular corrosion |
Detailed explanation of key performance indicators
Typical grade S22253 (022Cr22Ni5Mo3N)
Requirements for this grade at 25℃:
- Tensile strength ≥620MPa
- Yield strength ≥450MPa
- Elongation ≥25%
- Hardness ≤290HBW
The pitting corrosion test must meet the 24-hour corrosion rate ≤10mg/(dm²·d) in 6%FeCl3 solution at 25±1℃
Engineering application suggestions
- When selecting, focus on the PREN value (pitting resistance equivalent), such as S25073 requires ≥41
- When transporting chlorine-containing media, it is recommended to add intergranular corrosion test (GB/T4334 E method)
- For high temperature conditions, refer to Appendix A data, such as S27603 at 250℃ Rp0.2 needs to be ≥400MPa
Key points of quality control
| Test items | Method standard | Acceptance index |
|---|---|---|
| Ultrasonic testing | GB/T5777-2019 | U3 level |
| Metallographic Structure | GB/T13305 | Ferrite 40-60% |
| Dimensional Deviation | GB/T17395 | Ordinary Grade/Advanced Grade Optional |
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