GB/T 40317-2021 in English
SUPERSEDEDSeamless stainless steel pipes for oxygen pipeline
- Issued on:2021-08-20
- Implemented on:2022-03-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$214.00
《GB/T 40317-2021氧气管线用不锈钢无缝钢管》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 the core content of the standard
| Technical dimension | Conventional steel pipe standard | Special requirements of this standard |
|---|---|---|
| Surface treatment | Pickling or mechanical polishing | Forced degreasing + passivation treatment (grease residue ≤120mg/m²) |
| Roughness control | Usually not specified separately | Inner surface Ra≤6.3μm (high level ≤3.2μm) |
| Hydraulic test | Conventional water pressure test | Special requirements for chloride ion content ≤25ppm |
Detailed explanation of key technical requirements
The standard stipulates that stainless steel seamless pipes for oxygen pipelines must be made using electric arc furnace/converter + refining process outside the furnace. The main grades include:
- S30408(06Cr19Ni10)
- S31603(022Cr17Ni12Mo2)
- S32168(06Cr18Ni11Ti)
Key points for special process control
Typical case of degreasing treatment
A liquid oxygen transportation project adopts S31603 steel pipe, implement four-level degreasing verification:
- Ultraviolet detection (320-380nm band)
- White filter paper wiping method
- Camphor rotation test
- Quantitative analysis (Appendix A weight method)
Background of standard evolution
This standard adds the following to GB/T14976 based on the explosion risk characteristics of oxygen delivery systems:
- Mandatory degreasing clause (Clause 7.7)
- -196℃ low temperature impact requirements (Table 5)
- Special hydraulic test medium specifications (Clause 7.5.2)
Implementation suggestions
| Application scenarios | Selection suggestions | Detection focus |
|---|---|---|
| High-pressure oxygen pipeline | Preferably use S31608 thick-walled pipe | 100% ultrasonic testing + hydraulic test |
| Liquid oxygen delivery system | Must use Low-temperature impact-compliant pipes | -196℃ Charpy impact test |
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