鐵素體/珠光體帶狀組織對L360N管線用無縫鋼管沖擊性能的影響

Effect of Ferrite/Pearlite Band Structure on Impact Property of L360N Seamless Steel Linepipe

摘要: 分析了L360N管線用無縫鋼管在熱軋態(tài)、920℃正火1h、1150℃均勻化退火3h、1150℃均勻化退火3h+920℃正火1h四種狀態(tài)下的微觀組織和力學(xué)性能,并對每種熱處理狀態(tài)下帶狀組織區(qū)域和非帶狀組織區(qū)域進行了對比。發(fā)現(xiàn)L360N管線鋼中的帶狀組織可以通過長時間高溫均勻化退火消除;其帶狀組織對拉伸性能影響不明顯,但對沖擊性能影響較大。

Abstract: Analyzed are the microstructures and mechanical properties of the L360N seamless steel linepipe with different heat treatment conditions, i.e., as-hot rolled, 1 hour-normalized at a temperature of 920 ℃, 3 hour-uniform annealed at a temperature of 1 150 ℃, and the combination of the latter two. The band areas and the non-band areas under the four different heat treatment conditions are compared. As a result, it is identified that the band structure of the L360N linepipe-purpose steel can be eliminated by means of long-time uniform annealing treatment at an elevated temperature, and that the band structure of the steel produces little influence on its tensile property, but strongly influences its impact property.