Rare Earth microalloied elements' influence on the organization and capability of X65 pipeline steel

With the X65 pipeline steel as raw material,we researched the influence of Ce on the organization and the low-temperature impact toughness.The result of the experiment was that:Ce had big influence on the organization and mechanics capability of X65 pipeline steel,Ce could thin the solidification to improve the capability of the steel.1# sample that was X65 pipeline steel without RE had dimple and uneven,its dimple and grain size was biggish;1# sample with RE’s dimple was small and uniform.The low-temperature impact and impact energy of 2# sample with RE were both higher.

X65管线钢落锤性能不合分析

针对唐山中厚板公司所生产20.8 mm厚X65管线钢板落锤试样性能不合现象,进行了金相组织及断口扫描电镜分析,发现不合试样的显微组织中针状铁素体含量较低,主要由于终冷温度高和冷却速率低造成,在后续的生产中优化了工艺,使产品落锤性能合格率得到明显提升。