Recent Progress and Application of Bainite Steels for High Strength Linepipe up to X120

Hitoshi Asahi; Yasuhiro Shinohara; Takuya Hara

doi:10.4028/www.scientific.net/MSF.638-642.3032

Paper Titles

Recrystallization of Coarse-Grained Nb-Containing AISI-430 Ferritic Stainless Steel
p.3009

Energy of Interatomic Bonds in Austenitic Steels
p.3015

The Activity of Nitrogen in the Liquid Fe-N-Cr Alloy Based on the Non-Random Solubility Model by Schmid - Fetzer
p.3021

Dissolution and Precipitation of Excess Phases in High-Nitrogen Steels
p.3026

Recent Progress and Application of Bainite Steels for High Strength Linepipe up to X120
p.3032

Mn-Series Low Carbon Air Cooling Bainitic Steels Containing Niobium
p.3038

Key Factors in Grain Refinement of Martensite and Bainite
p.3044

Further Corrosion Behaviors of Low Carbon Bainitic Steel in the Environment Containing Cl^- after the Rust Layer Damaged
p.3050

Cyclic Deformation and Fatigue Crack Behavior of Extruded AZ31B Magnesium Alloy
p.3056

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Recent Progress and Application of Bainite Steels for High Strength Linepipe up to X120

Abstract:

For the constant transmission of gas through a pipeline, steel weight decreases linearly with an increase in the strength of the linepipe irrespective of pipe size and internal pressure. Thus, high-strength large-diameter linepipe up to X120 has been developed and is now being applied to reduce pipe costs, transportation costs and construction costs. To meet the excellent weldability and low production costs required for the linepipe application of bainite produced through using Thermo-Mechanical Control Processing (TMCP) from low carbon chemistry is essential. Dual phase steel made by means of the introduction of ferrite in the bainite matrix mitigates the inferior properties of bainite. Herein, the production parameters affecting the microstructure and the properties are overviewed.