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针对西气东输三线在强震和断层活跃地区对基于应变设计的抗大变形1 219mm×26.4mm X80钢管的迫切需求,通过光学金相、SEM、拉伸和冲击试验研究了抗大变形“铁素体+贝氏体”双相钢的铁素体体积分数、晶粒尺寸对钢板/管的纵向屈服强度、均匀变形伸长率、冲击韧性的影响规律,总结了小批量生产中板管关系的变化特点。发现1 219mm×26.4mm X80抗大变形钢管在较大的铁素体体积分数变化范围内可实现技术指标的要求,但较高的铁素体数量不利于钢管的冲击韧性,铁素体体积分数不宜过大;铁素体晶粒细化对提高钢管的强度和改善钢管的断裂韧性十分关键,多边形铁素体细化是十分必要的。
In view of the urgent need of the large deformation 1 219mm × 26.4mm X80 steel tube based on strain design in the strong earthquakes and active faults in the active area of the West-East Gas Pipeline, the optical properties, anti-deformation and anti-deformation “Ferrite + bainite ” dual-phase steel ferrite volume fraction, the grain size of the plate / tube longitudinal yield strength, uniform deformation elongation, impact toughness of the law, summed up the small batch production The relationship between the changes in the characteristics of the plate. It was found that 1 219mm × 26.4mm X80 large deformation resistant steel can meet the technical requirements in the range of larger volume fraction of ferrite. However, the higher ferrite amount is not conducive to the impact toughness of the steel pipe. The ferrite volume Fraction should not be too large; ferrite grain refinement to improve the strength of steel and improve the fracture toughness of steel is critical, polygonal ferrite refinement is very necessary.