GB/T 9948-2013 in English
SUPERSEDEDSeamless steel tubes for petroleum cracking
- Issued on:2013-09-18
- Implemented on:2014-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$243.00
| Standard No: | GB/T 9948-2013 |
| Document status: | SUPERSEDED |
| Title in English: | Seamless steel tubes for petroleum cracking |
| Title in Chinese: | 石油裂化用无缝钢管 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2013-09-18 |
| Implemented on: | 2014-07-01 |
| Superseding: |
GB 9948-2006 Seamless steel tubes for petroleum cracking
|
| 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: | seamless steel tubes
seamless steel pipes special steel pipes petroleum cracking stainless steel pipes austenitic stainless steels |
| Related Topics: | gb/t9948
Titanium seamless steel pipe deuterium carbon crack seamless steel pipe GB9948 GB/T9948 GBT9948 GB/T 9948-2013 Petroleum pipes (oil pipes, casings) steel tube curvature About the cracks Classification of cracks in the petroleum industry gb/t9948-2013 gbt9948-2013 |
本标准规定了石油裂化用无缝钢管的分类、代号、尺寸、外形、重量、技术要求、试验方法、检验规则、
包装、标志和质量证明书。
本标准适用于石油化工用炉管、热交换器管和压力管道用无缝钢管。
Introduction
Standard Revision Background and Scope of Application
GB/T9948-2013 is the latest national standard for seamless steel pipes for petroleum cracking, replacing the 2006 version of the standard. It is mainly used in furnace tubes, heat exchanger tubes and pressure pipes in the petrochemical industry. It has been converted into a recommended standard since 2017, but clauses 5.5 and 6.1.1 remain mandatory requirements.
Comparison of key technical changes
| Revision dimensions | GB/T9948-2006 | GB/T9948-2013 |
|---|---|---|
| Steel grades | 9 types | 7 new types including 12Cr1Mo, a total of 16 types |
| Delivery method | Nominal wall thickness only | Add minimum wall thickness delivery option |
| Testing requirements | Basic non-destructive testing | Add intergranular corrosion test and special requirements for H2S environment |
| International integration | Reference to ASTM A335 and other 2 items | Added EN10216-2 and other 3 international standards |
Analysis of core technical requirements
1. Dimension and tolerance system
The standard adopts a dual-track tolerance system:
- Conventional grade: Suitable for general working conditions, tolerance ±0.50mm when outer diameter ≤54mm
- Advanced: For precision application scenarios, the tolerance of the same specification is tightened to ±0.30mm
Newly added example of calculation of allowable deviation of minimum wall thickness delivery method: When Smin=4.0mm of 12Cr1MoV steel pipe, +0.90mm is allowed for ordinary grade.
2. Material Property Matrix
Comparison of Mechanical Properties of Typical Steels:
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Impact Energy (J) |
|---|---|---|---|
| 20 | 410-550 | 245 | 40 |
| 12Cr1MoV | 470-640 | 255 | 40 |
| 07Cr19Ni10 | ≥520 | 205 | - |
Technical requirements for special applications
Special steel pipes for H2S environments
For hydrogen sulfide environments, the standard specifies special requirements in Appendix B:
- Carbon equivalent CEV≤0.42%, strictly control P≤0.015%
- Upper limit of hardness 190HBW, yield strength ≤345MPa
- Surface defect depth ≤0.4mm
Special requirements for stainless steel pipes
Austenitic stainless steels such as 07Cr19Ni11Ti must pass:
- Solution treatment (≥1050℃ rapid cooling)
- Intergranular corrosion test (GB/T4334 method E)
- Total number of non-metallic inclusions ≤6.5
Implementation suggestions
Selection guide:For high temperature conditions, 12Cr9MoNT (590-740MPa) is preferred, and 022Cr17Ni12Mo2 is selected for corrosive environments.
Acceptance points:
- Check heat treatment records (normalizing temperature deviation ≤20℃)
- Pay attention to the impact energy conversion of small-size specimens (5mm specimens are calculated as 50%)
- Wall thickness measurement adopts multi-point detection of ultrasonic thickness gauge
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