Abstract: According to the Φ1422 mm pipe production requirements of the China-Russia eastern oil and gas pipeline X80M and the 5300 mm wide and thick plate production line process equipment characteristics, the complete industrialized manufacturing technology for low temperature pipeline steel has been successfully developed by means of alloy design with extra-wide and extra-thick steel plates,as well as the refinement of microstructure and TMCP fine control at Nanjing Iron and Steel Co Ltd. In order to improve the low temperature toughness of the steel 30. 8 mm plate, the 320 mm slab is rolled by turn-spread, and the spread rolling is carried out by 3 passes, and the reduction with 80 mm is performed. After widening, the longitudinal rolling is carried out, and the reduction at per pass is more than 22 mm. The steel plate enters ultra-fast cooling for cooling. The cooling temperature is set at 740 ~ 750 °C , and the final cooling temperature is 430 ~ 450 °C. The cryogenic pipeline is produced, and its microstructure is uniform and fine acicular ferrite with high strength and good low temperature toughness.

摘要： 南钢根据中俄东线油气管道Φ1422 mm特宽幅X80M管线钢制管要求和5300 mm宽厚板生产线工艺装备特点,通过低温用特宽、特厚钢板的合金设计、微观组织细化、TMCP精细调控等技术,成功开发了低温超大输量管道用钢的成套工业化制造技术。为了提高30.8 mm钢板的低温韧性,320 mm铸坯进行转钢展宽轧制,展宽3道次,压下量80mm;展宽后进行纵道次轧制,压下量都在22mm以上,钢板进入超快冷进行冷却,开冷温度设定为740～750℃,终冷温度430～450℃。得到了晶粒均匀细小的针状铁素体组织,具有较高的强度与良好的低温韧性的低温管线产品。