低温条件下带状组织对X70管线钢弯管性能的影响

Effect of Band Structure on Properties of X70 Pipeline Steel Bend at Low Temperature

摘要: 通过低温夏比冲击试验、拉伸试验及水压爆破试验等，研究了带状组织对X70管线钢弯管性能的影响。结果表明：当试验温度相同时，含带状组织X70管线钢弯管的冲击功比无带状组织弯管的增加了10～30 J；带状组织对X70管线钢弯管不同区域的拉伸强度影响不大，但含带状组织弯管的屈强比较高，拉伸性能比无带状组织弯管的差；带状组织的存在对弯管的水压爆破试验结果的影响较小。

Abstract: The effect of band structure on X70 pipeline steel bend was studied by low temperature Charpy impact test, tensile test and water pressure blasting test. The results show that the impact energy of X70 pipeline steel bend with band structure increased 10-30 J than that of X70 pipeline steel bend without band structure at the same test temperature. Band structure had little effect on the tensile strength of different locations of X70 pipeline steel bend, but the bend with band structure had higher yield-tensile ratio and tensile properties was worse than that of bend without band structure. Band structure had slight effect on the result of water pressure blasting test of bend.