冷定径工艺对热轧HFW焊管性能的影响

Influence of Cold Sizing Process on Hot-stretch Reducing HFW Pipe Performance

为了优化热轧HFW焊管的几何尺寸精度以及提高管坯强度性能,以热轧HFW J55套管管坯为例,通过力学性能、显微组织分析及硬度等试验方法,研究冷定径对管坯性能的强化作用以及不同定径量下管坯性能的变化趋势。试验结果显示,钢管在冷定径工艺处理下,管坯纵向屈服强度及抗拉强度均得到强化,最大可提升7%;定径量越大,管坯强度上升幅度越明显。研究结果表明,对于低钢级或者韧性要求不高的钢管生产时,在热张力减径后再增加冷定径工艺可以提高钢管强度,但如需要生产更高强度或更高钢级的钢管仍需相应的热处理工艺。

In order to optimize the geometry precision of hot rolled HFW pipe and improve the performance of pipe billet strength, taking HFW J55 casing billet as an example, the strengthening effect of cold sizing on pipe billet performance and the change trend under different sizing reduction were studied through the analysis of the mechanical properties, microstructure and hardness test method. The results showed that under the treatment of cold sizing process, the longitudinal yield strength and tensile strength of pipe billet were strengthened, with maximum increase of 7%; the larger the sizing reduction, the more obvious the increase of pipe billet intensity. The research results showed that when produce low steel grade pipe or low toughness requirement steel pipe, increasing cold sizing process after hot-stretch reducing can increase steel pipe strength, but steel pipes that require higher strength or higher steel grade still need to be treated with appropriate heat treatment process.