Analysis of Microstructures and Property of Welded Joint of EH36 Thick Steel Plate for Offshore Platform
LI Min
Abstract：In accordance with the requirements of EN 10225-2009 appendix E Standard, the EH36 thick steel plate with 100 mm thickness for offshore platforms was welded by submerge-arc welding technology with 50 kJ/cm high heat input. The microstructure and properties of the weld joint were analyzed. The results showed that either welded or heat treated after welding, the hardness HV10 of the weld joint of EH36 thick steel plate ≤ 280, tensile strength ≥ 510 MPa, the mean value of absorbed-in-fracture energy at-40℃≥50 J, the surface microstructure mainly are coarse lath bainite+a small amount of granular bainite and the core structure is fine ferrite+pearlite. This showed that the EH36 thick steel plates developed by Jinan Steel meet the welding needs of offshore platforms. The differences of the fusion line shape and heat transfer status between the surface and center of weld joint are main reasons to lead to surface HAZ grain coarser than those of center HAZ, so surface toughness is lower than that of center.
Keywords：EH36 thick platehigh heat input weldingsubmerge-arc weldingweld jointmicrostructureproperty
Publication Date：2013-09-01
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：3( 32-34 )