Effect of Squeeze-out and Sizing Ratio to The Residual Circumferential Stress of HFW Pipe

Siens Harianto,Ardian Fandika,Peter Darto,Elang Susilaputra,M Anis,B Munir

doi:10.1051/matecconf/201926904005

Siens Harianto, Ardian Fandika + Show 4 more

Open Access

https://doi.org/10.1051/matecconf/201926904005

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Abstract

Residual circumferential stress originates from pipe forming process has a negative impact on the pressure carrying capacity; therefore it is necessary to keep the level of residual stress as low as possible and distributed uniformly around the pipe. Manufacturing of HFW (High-Frequency Welded) pipe involves pinching, bending, forming, welding, squeezing, sizing and straightening processes in several stages which produce both elastic and plastic deformation. Those processes produce residual stresses in the pipe wall in the circumferential and longitudinal directions. This paper presents the result of the trial test to investigate the effect of squeeze-out (SO) and the sizing ratio (SR) to the residual circumferential stress on HFW pipe. The trial was performed at PT INDAL STEEL PIPE (ISP) pipe mill, on pipe API 5L L360MO PSL2, nominal Outside Diameter (OD) 273 mm, wall thickness 12.7 mm. The SO was 0.7t and 0.9t, while the SR was set at 0.5 %, 0.8 %, and 1.0 %.

Highlights

Masubuchi [1] defined residual stress as the stresses that would exist in the material if all external loads were removed
The objective of this study is to investigate the effect of SO and sizing ratio (SR) to the residual circumferential stress through a production experiment performed at INDAL STEEL PIPE (ISP) pipe mill and this paper present the tests result
From the results of this study, it is concluded that SO and SR have a positive impact on the residual circumferential stress of HFW pipe

Summary

Introduction

Masubuchi [1] defined residual stress as the stresses that would exist in the material if all external loads were removed. Many researchers have studied residual stresses in HFW pipe. Mjaku and Shala [2] reported the measurement of residual stress and strain in HFW pipe using slitting technique and measured the residual stresses using strain gauges. Anderson and Brown [3] investigated the effect of residual stresses due to forming process to the fracture characteristic of ERW pipe using finite element simulation. They reported that the residual stresses due to forming have a significant effect on the integrity of the pipeline when three conditions are met: 1. They reported that the residual stresses due to forming have a significant effect on the integrity of the pipeline when three conditions are met: 1. The seam weld toughness is low

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