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  • Product name: Steel pipe for anti-acid pipeline
  • ID: 002

Steel pipe standard for anti-acid pipeline

China’s national standard
Purpose: It is applicable to the high-quality anti-acid pipelines and pipes containing corrosive medium environment, such as H2S,CO2, H2S+CO2 and chlorine ion; the purified steel materials are collocated to maintain a low sulfur and phosphate content, effectively control residual elements and oxidized elements and make a reasonable control of content and role of alloy elements such as Cr,Mo,Ni in the steel. It can not only upgrade the properties, but also guarantee the steel rigidity, corrosion resistance, mechanical property, hardness, fracture tenacity, fatigue resistance, welding feasibility and anti-cracking property; it is applied in the above-ground collection and transmission pipes and subsea collection and transmission pipes.

Steel level

Standard
Steel level
GB9711
L245NCS、L290NCS、L320NCS、L360NCS、L390NCS、L415NCS、L450QCS、L485QCS、L555QCS

 

Anti-corrosive test 

Anti-corrosive test 
Inspection methods
Selection of solution
Overall dimension of specimen
Threshold stress
Test time (hour/h)
Test objective
HIC test
NACE TM0284-2003
Solution A
100×20×T
-
96
CSR≤2% CLR≤15%
Solution B
CSR=0 CLR=0 CTR=0
SSC test
NACE TM0177-2005 Method A
Solution A or B
∮3.81
SYMS×72%
720
No fracture
Solution A or B
∮6.35
SYMS×80%
720
No fracture
NACE TM0177-2005 Method B
Solution A or B
Please refer to Annotation 3 in detail.
SYMS×80%
720
No fracture

Annotations:
1. The test method can be selected according to the client’s specific requirements.
2. In HIC test, the wall thickness (T) is confirmed according to the wall thickness of sampling steel pipe.
3. In the standard bending test, the specimen dimension is as follows: 4.57 ± 0.13mm (0.180±0.005in) in width; 1.52±0.13mm (0.060±0.005in) in thickness; 67.3±0.13mm (2.65±0.05in) in length.