基于PQF的30MnCr22无缝钢管TMCP的实验研究

Research on TMCP in the rolling of 30MnCr22 seamless pipe based on PQF

以P110钢级石油套管30Mn Cr22为研究对象,采用Gleeble-1500D热模拟实验机进行多道次热压缩实验,模拟其PQF轧管生产中的穿孔、连轧及减径过程,分析每个变形阶段的再结晶行为及组织演变规律,为基于PQF的无缝钢管轧制热机械控制工艺(TMCP)的实现提供实验依据。研究结果表明,在穿孔、连轧和减径3个变形阶段均可以通过不同的再结晶控制轧制策略来细化晶粒,从而实现TMCP。特别是减径过程中通过应变累积实现动态再结晶,并通过随后的快速冷却,能够得到晶粒细小、强韧性好的最终组织性能。所以控制轧制与控制冷却的良好配合是实现TMCP的关键。

The piercing,PQF continuous rolling and reducing of P110 grade oil casing 30 Mn Cr22 were simulated by multi-pass hot compression tests on Gleeble-1500 D thermal-mechanical simulator. The recrystallization and microstructure evolution laws of each deformation stage were analyzed to provide experimental basis for realizing Thermo-Mechanical Control Process( TMCP) in PQF pipe mill.The results indicate that the grain size can be refined and thus realizing the TMCP by different recrystallization controlled rolling in piercing,PQF continuous rolling and reducing. Especially in reducing process, dynamic recrystallization can occur by strain accumulation,and through the subsequent rapid cooling,refined microstructure and excellent strength and toughness can be obtained. So good cooperation of controlled rolling and controlled cooling is the key to realization of TMCP.