Advertisement

Development of Offshore Steel for High Heat Input Welding

  • Xiaodong Ma
  • Peng Zhang
  • Tingliang Dong
  • Feng Wang
  • Baojun ZhaoEmail author
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

To reduce the construction cost and period of steel structure, high-efficiency welding methods applying high heat input have been widely employed. However, deterioration of the strength and toughness, especially low-temperature impact toughness, due to the coarse grains in the heat-affected zone (HAZ) of weld steels often comes along with high heat input welding. Thick offshore steel has been developed by Ti deoxidization for the use of high heat input welding. The inclusions of the steel were analysed by EPMA and SEM, and the major inclusions were identified to be Al2O3-(MgO) and Al2O3-CaO-(TiO2) types. The steel plates with different thickness over 40 mm were welded with heat input over 100 kJ/cm, and Charpy impact energies of the welding joints at −40 °C were over 75 J. The nano-sized TiN particles in HAZ were observed and were considered to retard the grain coarsening in the HAZ during high heat input welding.

Keywords

Offshore steel High heat input welding Heat-affected zone Inclusions 

Notes

Acknowledgements

The authors would like to thank the financial support from HBIS Group through HBIS-UQ Innovation Centre for Sustainable Steel. The authors acknowledge the facilities, and the scientific and technical assistance, of the Australian Microscopy & Microanalysis Research Facility at the Centre for Microscopy and Microanalysis, The University of Queensland.

References

  1. 1.
    Ogibayashi S (1994) Advances in technology of oxide metallurgy. Nippon Steel Techn Rep 61:70–76Google Scholar
  2. 2.
    Mu W, Jonsson PG, Nakajima K (2017) Recent aspects on the effect of inclusion characteristics on the intragranular ferrite formation in low alloy steels: a review. High Temp Mater Processes 36:309–325CrossRefGoogle Scholar
  3. 3.
    Sarma DS, Karasev AV, Jonsson PG (2009) On the role of non-metallic inclusions in the nucleation of acicular ferrite in steels. ISIJ Int 49:1063–1074CrossRefGoogle Scholar
  4. 4.
    Kojima A, Kiyose A, Uemori R, Minagawa M, Hoshino M, Nakashima T, Ishida K, Yasui H (2004) Super high HAZ toughness technology with fine microstructure imparted by fine particles. Nippon Steel Tech Rep 90:2–6Google Scholar
  5. 5.
    Tomita Y (1994) Improvement in HAZ toughness of steel by TiN-MnS addition. ISIJ Int 34:829–835CrossRefGoogle Scholar
  6. 6.
    Jung IH (2010) Overview of the applications of thermodynamic databases to steelmaking processes. CALPHAD: Comput Coupling of Phase Diagrams and Thermochemistry 34: 332–362CrossRefGoogle Scholar

Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • Xiaodong Ma
    • 1
  • Peng Zhang
    • 2
  • Tingliang Dong
    • 2
  • Feng Wang
    • 2
  • Baojun Zhao
    • 1
    Email author
  1. 1.The University of QueenslandBrisbaneAustralia
  2. 2.Hebei Iron and Steel Group Co., Ltd.ShijiazhuangChina

Personalised recommendations