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为了满足高要求耐蚀管线管的需求,通过优化炼钢工艺,改善钢中夹杂物和中心偏析,合理设定厚板工艺得到均匀的针状铁素体组织,并优化UOE成型和扩径工艺,成功开发并生产了X65MS钢级Φ914 mm×19.8 mm管线管,并对研制的管线钢管进行了理化性能试验及抗HIC和SSC性能试验。试验结果显示,82℃时的屈服强度和抗拉强度较常温分别下降25 MPa和32 MPa,屈强比低于0.90;焊缝、熔合线冲击功>200 J,-20℃管体SA均值为99%;附加UT定位试样缺陷后测得裂纹指标满足CLR≤10%;抗HIC、SSC、SOHIC试验均合格。试验结果表明,通过良好的成分和轧制工艺设计可获得高要求X65MS耐腐蚀管线管。
In order to meet the needs of high-demand corrosion-resistant pipelines, by optimizing the steelmaking process, to improve inclusions and center segregation in steel, the reasonable thick plate technology to obtain uniform acicular ferrite and optimize the UOE molding and diameter expansion process , Successfully developed and produced X65MS grade Φ914 mm × 19.8 mm pipeline pipe, and conducted physical and chemical performance tests and HIC and SSC performance tests on the developed pipeline steel pipes. The results showed that the yield strength and tensile strength at 82 ℃ decreased by 25 MPa and 32 MPa, respectively, and the yield ratio was lower than 0.90; the weld joint and fusion line impact energy were> 200 J and the mean value of SA at -20 ℃ was 99%. The crack index measured by the additional UT positioning sample defect meets the CLR≤10%; the anti-HIC, SSC and SOHIC tests are all qualified. The test results show that high demand X65MS corrosion resistant line tubing is achieved through good compositional and rolling process design.