Perilaku Laju Rambatan Retak Fatik Sambungan Spiral Las Busur Rendam Pipa Baja API 5L X-52 yang Mengalami Perlakuan Panas Stress Relief
| Main Author: | Perpustakaan UGM, i-lib |
|---|---|
| Format: | Article NonPeerReviewed |
| Terbitan: |
[Yogyakarta] : Universitas Gadjah Mada
, 2006
|
| Subjects: | |
| Online Access: |
https://repository.ugm.ac.id/23187/ http://i-lib.ugm.ac.id/jurnal/download.php?dataId=6128 |
Daftar Isi:
- Spiral welded steel pipes are widely used for oil/gas (API) transmission. Such pipes are usually produced by forming hot-rolled coil (HRC) steels into tubular products and welding is performed along spirally joining lines using a submerged arc welding (SAW) process. For structural applications, weld metals for API 5L X-52 steel pipes must have high strength, good impact toughness and high resistance to fatigue crack growth. The present investigations aims to study effects of stress relief heat treatment on mechanical properties of submerged arc spiral welded API 5L X-52 steel pipes in particular fatigue crack growth behaviour. Experiments were carried out by heating submerged arc steel weld metals of API 5L X-52 steel pipes to various temperatures, namely 400, 500 and 600 °C for 3 hours. Subsequently, a sequence of tests were conducted including microstructural examination, hardness test, tensile test and fatigue crack growth test. Results of this investigation show that stress relief heat treatment is proved to improve resistance to crack growth. At low AK, the weld metal which is heat treated at 600 °C reveals the highest resistance to fatigue marked its lowest value of A. However, for higher AK, the n value of the weld metal heat treated at 500 °C is the lowest suggesting that this weld metal has optimum resistance to fatigue crack growth. Keywords : API 5L X-52 steel pipes, submerged arc welding and fatigue crack growth