Processing and Analysis of Experimental Data for the Impact Toughness of the Steel Quality J55 API 5CT Using Design Expert Software

Malush Mjaku
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Abstract

In this paper the plate from the steel of quality grade J55 API 5CT and the process of pipe forming Ø139.7x7.72 mm and Ø219.1x7.72 mm with rectilinear seam is analysed. The impact of deformation level in the cold and mechanical properties of the steel coils before and after the forming of the pipes are elaborated and processed through Design Expert Software. For analysis it was used the planning method of the experiment. It was built the mathematical model for the experiment with one index (impact toughness - Kv) and with one factor (level of deformation in the cold), and with few levels and two blocks (before and after the forming of the pipes). Statistical analysis of experimental data for models of plate and pipe were obtained through Design Expert Software. Based on such date graphic representation for the influence of deformation rate on Charpy-V notch energy was generated. Application of the Design Expert Software helps quick and correct combinations of three criteria (treatments) in order to estimate the level of deformation throughout the bending of sheet and calibration, influence of the decrease of impact toughness during the forming of pipes.
用Design Expert软件对J55 API 5CT钢的冲击韧性试验数据进行处理与分析
本文分析了质量等级为J55 API 5CT的钢板及Ø139.7x7.72 mm和Ø219.1x7.72 mm的直缝管材的成形工艺。通过Design Expert软件对钢管成形前后的冷态变形水平和钢卷力学性能的影响进行了阐述和处理。采用实验计划法进行分析。建立了单指标(冲击韧性- Kv)、单因素(冷变形水平)、少水平、两块(管材成形前后)的实验数学模型。利用Design Expert软件对板、管模型的实验数据进行了统计分析。在此基础上,生成了变形速率对Charpy-V缺口能量影响的数据图形表示。设计专家软件的应用有助于快速和正确的三个标准(处理)的组合,以便估计整个板材弯曲和校准过程中的变形水平,以及在管道成形过程中冲击韧性下降的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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