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Anti - Hydrogen Cracking of Seamless Tube Materials

Seamless pipeline is mainly used for conveying high pressure oil and gas near wellhead. With the increasingly serious problem of hydrogen sulfide corrosion, anti-sulfur seamless pipeline development is imminent, and anti-sulfur performance is the key to good or bad. The results show that the addition of Cu and Ni can improve the HIC performance of the seamless pipe material, reduce the S content in the steel, and reduce the content of S The sensitivity of hydrogen bubbling.
With the deepening of oil and gas extraction, mining conditions are complex and in the sulfur environment of oil and gas wells more and more, hydrogen sulfide corrosion problem is very sharp. In recent years, domestic and international demand for anti-sulfur seamless pipeline is increasing. Seamless pipeline is mainly used for the delivery of high pressure oil and gas near the wellhead, is the use of seamless pipe production without the manufacture of welded steel pipe. This paper intends to discuss the development of anti-sulfur seamless pipeline.
1 test method
According to ISO3183 standard, the use of immersion method, in the laboratory smelting 7 furnace 1 t ingot, through forging, perforation, pipe jacking and Zhang reduction caused by the tube, in the steel tube intercept 20 mm × 100 mm × 5 mm thickness or thick tube test (Crack length rate CLR, crack thickness rate CTR, cracking sensitivity rate CSR) were calculated by metallographic method, and the samples were taken into the solution according to the standard conditions. After 96 h, Comparison of resistance to hydrogen induced cracking (HIC).
2 factors that affect HIC performance
2.1 Media factors
1) pH. A large number of studies have shown that the sensitivity of hydrogen bubbling decreases with increasing pH at pH 1 to 6, and no hydrogen bubbling occurs when pH> 6.
2) H2S concentration. The higher the concentration of hydrogen sulfide, the greater the sensitivity of hydrogen bubbling.
3) chloride ion. In the pH range of 3.5 to 4.5, the presence of Cl- increases the corrosion rate and increases the sensitivity of hydrogen bubbling.
4) temperature. 25 ℃ when the maximum CLR, hydrogen bubble the most sensitive. Below 25 ° C, the temperature rise accelerates the corrosion reaction and the hydrogen diffusion rate, thereby increasing the sensitivity of hydrogen bubbling. And higher than 25 ℃, due to the decline in H2S concentration, but the sensitivity of hydrogen bubble decreased.
5) Time. Test with 96 h as a comparison, under normal circumstances with the test time increases, the degree of corrosion tends to serious.

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