【摘要】 依据NACE标准,研究了采用新型超快速冷却工艺生产的X80管线钢抗硫化物应力腐蚀开裂(SSCC)、抗氢致开裂(HIC)和抗CO2等腐蚀的情况。SSCC腐蚀实验表明,产生开裂的临界应力值在65%σs(390MPa)左右,超过此临界值,试样的腐蚀敏感性较高,抗腐蚀能力较差,在95%σs加载水平下,应力敏感性极高。HIC腐蚀实验表明,裂纹敏感百分比、裂纹长度百分比和裂纹厚度百分比均为零。抗CO2腐蚀实验表明,在CO2压力为0.1MPa条件下,平均腐蚀速率为0.6843mm/a。研究表明采用新型超快冷工艺生产的X80管线钢具有优良的抗SSCC腐蚀性能、抗HIC腐蚀性能和抗CO2腐蚀性能。更多还原

【Abstract】 According to the NACE standard,the corrosion resistance of the new type ultra fast cooling process produced X80 pipeline steel to sulfide stress corrosion cracking(SSCC),hydrogen induced cracking(HIC)and CO2 was investigated.SSCC corrosion experiments show that critical cracking stress value is about 65%σs(390MPa),over the critical value,corrosion sensitivity of the test specimen becomes higher,and the corrosion resistance becomes poor.Under the 95% σsloading level,the stress sensitivity is extremely high.HIC corrosion experiments show that the crack sensitive percentage,the crack length percentage and the crack thickness percentage is all zero,CO2 corrosion resistance experiments show that when the pressure of CO2 is 0.1MPa,the average corrosion rate is0.6843mm/a.The research shows that the X80 pipeline steel produced by the ultra fast cooling process have superior resistance to SSCC,HIC and CO2.更多还原